Search

Your search keyword '"Amelin, Yuri"' showing total 410 results
Start Over Author "Amelin, Yuri"
410 results on '"Amelin, Yuri"'

1. The Ni isotopic composition of Ryugu reveals a common accretion region for carbonaceous chondrites

Author

Spitzer, Fridolin, Kleine, Thorsten, Burkhardt, Christoph, Hopp, Timo, Yokoyama, Tetsuya, Abe, Yoshinari, Aléon, Jérôme, Alexander, Conel M. O'D., Amari, Sachiko, Amelin, Yuri, Bajo, Ken-ichi, Bizzarro, Martin, Bouvier, Audrey, Carlson, Richard W., Chaussidon, Marc, Choi, Byeon-Gak, Dauphas, Nicolas, Davis, Andrew M., Di Rocco, Tommaso, Fujiya, Wataru, Fukai, Ryota, Gautam, Ikshu, Haba, Makiko K., Hibiya, Yuki, Hidaka, Hiroshi, Homma, Hisashi, Hoppe, Peter, Huss, Gary R., Ichida, Kiyohiro, Iizuka, Tsuyoshi, Ireland, Trevor R., Ishikawa, Akira, Itoh, Shoichi, Kawasaki, Noriyuki, Kita, Noriko T., Kitajima, Kouki, Komatani, Shintaro, Krot, Alexander N., Liu, Ming-Chang, Masuda, Yuki, Morita, Mayu, Moynier, Fréderic, Motomura, Kazuko, Nakai, Izumi, Nagashima, Kazuhide, Nguyen, Ann, Nittler, Larry, Onose, Morihiko, Pack, Andreas, Park, Changkun, Piani, Laurette, Qin, Liping, Russell, Sara S., Sakamoto, Naoya, Schönbächler, Maria, Tafla, Lauren, Tang, Haolan, Terada, Kentaro, Terada, Yasuko, Usui, Tomohiro, Wada, Sohei, Wadhwa, Meenakshi, Walker, Richard J., Yamashita, Katsuyuki, Yin, Qing-Zhu, Yoneda, Shigekazu, Young, Edward D., Yui, Hiroharu, Zhang, Ai-Cheng, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Sakamoto, Kanako, Yabuta, Hikaru, Abe, Masanao, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Okada, Tatsuaki, Yada, Toru, Yogata, Kasumi, Nakazawa, Satoru, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Tsuda, Yuichi, Watanabe, Sei-ichiro, Yoshikawa, Makoto, Tachibana, Shogo, and Yurimoto, Hisayoshi

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

The isotopic compositions of samples returned from Cb-type asteroid Ryugu and Ivuna-type (CI) chondrites are distinct from other carbonaceous chondrites, which has led to the suggestion that Ryugu and CI chondrites formed in a different region of the accretion disk, possibly around the orbits of Uranus and Neptune. We show that, like for Fe, Ryugu and CI chondrites also have indistinguishable Ni isotope anomalies, which differ from those of other carbonaceous chondrites. We propose that this unique Fe and Ni isotopic composition reflects different accretion efficiencies of small FeNi metal grains among the carbonaceous chondrite parent bodies. The CI chondrites incorporated these grains more efficiently, possibly because they formed at the end of the disk's lifetime, when planetesimal formation was also triggered by photoevaporation of the disk. Isotopic variations among carbonaceous chondrites may thus reflect fractionation of distinct dust components from a common reservoir, implying CI chondrites and Ryugu may have formed in the same region of the accretion disk as other carbonaceous chondrites., Comment: Published open access in Science Advances

Published
2024
Full Text
View/download PDF

2. Role of natural isotopic fractionation in isotope geo- and cosmo-chronology: A theoretical investigation

Author

Di, Yankun, Yin, Qing-Zhu, Tissot, François LH, and Amelin, Yuri

Subjects
Earth Sciences, Geochemistry, Geology, Isotope fractionation, Geochronology, Isochron, Internal normalization, Fractionation correction, Physical Geography and Environmental Geoscience, Geochemistry & Geophysics
Abstract

We introduce a new isotope chronological model in which the natural mass-dependent isotopic fractionation effects of the radioactive (“parent”) and radiogenic (“daughter”) elements are systematically and rigorously considered. Using this model, we show that internally-normalized radiogenic isotopic ratios, commonly determined for daughter elements such as Sr, Nd, Cr, Ni, Hf, W, and Os, are dependent on the extent of natural isotopic fractionation of the daughter and parent elements at the time of system closure. This dependence indicates that (1) in two samples derived from the same isotopically homogeneous source at the same time and with identical radiogenic ingrowth over time, the present-day internally-normalized radiogenic isotope ratios would be different if they were initially fractionated to different degrees, and (2) if different internally-normalized radiogenic isotopic ratios are observed for two co-genetic objects, the difference between them would include contributions from both radiogenic ingrowth and natural isotopic fractionation. Consequently, the isochron dating equations employed in traditional chronological studies will yield inaccurate results when significant natural isotopic fractionation is present among the studied samples. Modified isochron equations that can be used to retrieve correct chronological information from isotopically-fractionated samples are presented. These theoretical considerations are applied to the 87Rb–87Sr, 147Sm–143Nd, and 146Sm–142Nd isotope systems of calcium–aluminium-rich inclusions (CAIs), a set of samples that have undergone significant natural Sr, Nd, and Sm isotope fractionation during their formation. The large natural Sr isotope fractionation (up to ca. 5.3 ‰ for 88Sr/86Sr) in fine-grained CAIs can generate analytically well-resolvable biases (>120 ppm) in the internally-normalized 87Sr/86Sr ratios and lead to significant scatters of their 87Rb–87Sr isochron (in conjunction with scatters induced by open-system disturbances). The 87Rb–87Sr systems of coarse-grained CAIs, on the contrary, are essentially not affected by natural Sr isotopic fractionation due to their much subdued fractionation degrees, resulting in a more robust isochron. Similarly, the large natural Nd (up to ca. 4.0 ‰ for 146Nd/144Nd) and Sm (up to ca. 7.1 ‰ for 152Sm/148Sm) isotopic fractionation in fine-grained CAIs can induce significant scatters of the 147Sm–143Nd isochron if the natural fractionation followed the kinetic or power law, and 146Sm–142Nd isochron if the natural fractionation followed the equilibrium, Rayleigh, or power law. This implies that when studying radioactive isotope systems in objects whose daughter and parent elements can undergo significant isotope fractionation in nature, accompanying stable isotope analyses are necessary for accurate chronological interpretations.

Published
2024

3. Water circulation in Ryugu asteroid affected the distribution of nucleosynthetic isotope anomalies in returned sample.

Author

Yokoyama, Tetsuya, Wadhwa, Meenakshi, Iizuka, Tsuyoshi, Rai, Vinai, Gautam, Ikshu, Hibiya, Yuki, Masuda, Yuki, Haba, Makiko, Fukai, Ryota, Hines, Rebekah, Phelan, Nicole, Abe, Yoshinari, Aléon, Jérôme, Alexander, Conel, Amari, Sachiko, Amelin, Yuri, Bajo, Ken-Ichi, Bizzarro, Martin, Bouvier, Audrey, Carlson, Richard, Chaussidon, Marc, Choi, Byeon-Gak, Dauphas, Nicolas, Davis, Andrew, Di Rocco, Tommaso, Fujiya, Wataru, Hidaka, Hiroshi, Homma, Hisashi, Hoppe, Peter, Huss, Gary, Ichida, Kiyohiro, Ireland, Trevor, Ishikawa, Akira, Itoh, Shoichi, Kawasaki, Noriyuki, Kita, Noriko, Kitajima, Koki, Kleine, Thorsten, Komatani, Shintaro, Krot, Alexander, Liu, Ming-Chang, McKeegan, Kevin, Morita, Mayu, Motomura, Kazuko, Moynier, Frédéric, Nakai, Izumi, Nagashima, Kazuhide, Nguyen, Ann, Nittler, Larry, Onose, Morihiko, Pack, Andreas, Park, Changkun, Piani, Laurette, Qin, Liping, Russell, Sara, Sakamoto, Naoya, Schönbächler, Maria, Tafla, Lauren, Tang, Haolan, Terada, Kentaro, Terada, Yasuko, Usui, Tomohiro, Wada, Sohei, Walker, Richard, Yamashita, Katsuyuki, Yoneda, Shigekazu, Young, Edward, Yui, Hiroharu, Zhang, Ai-Cheng, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Sakamoto, Kanako, Yabuta, Hikaru, Abe, Masanao, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Okada, Tatsuaki, Yada, Toru, Yogata, Kasumi, Nakazawa, Satoru, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Tsuda, Yuichi, Watanabe, Sei-Ichiro, Yoshikawa, Makoto, Tachibana, Shogo, Yurimoto, Hisayoshi, and Yin, Qing-Zhu

Abstract

Studies of material returned from Cb asteroid Ryugu have revealed considerable mineralogical and chemical heterogeneity, stemming primarily from brecciation and aqueous alteration. Isotopic anomalies could have also been affected by delivery of exogenous clasts and aqueous mobilization of soluble elements. Here, we show that isotopic anomalies for mildly soluble Cr are highly variable in Ryugu and CI chondrites, whereas those of Ti are relatively uniform. This variation in Cr isotope ratios is most likely due to physicochemical fractionation between 54Cr-rich presolar nanoparticles and Cr-bearing secondary minerals at the millimeter-scale in the bulk samples, likely due to extensive aqueous alteration in their parent bodies that occurred [Formula: see text] after Solar System birth. In contrast, Ti isotopes were marginally affected by this process. Our results show that isotopic heterogeneities in asteroids are not all nebular or accretionary in nature but can also reflect element redistribution by water.

Published
2023

4. Temporal framework for the Yanliao Biota and timing of the origin of crown mammals

Author

Yu, Zhiqiang, Wang, Haibing, Zhang, Chi, Dong, Liping, Huyskens, Magdalena H, Cui, Zexian, Cary, Paige, Di, Yankun, Amelin, Yuri, Li, Gang, Li, Qiuli, Xia, Xiao-Ping, Deng, Chenglong, Wang, Yuanqing, He, Huaiyu, and Yin, Qing-Zhu

Subjects
Earth Sciences, Geology, Yanliao Biota, U-Pb geochronology, Jurassic, Bayesian tip-dating analysis, evolution, Mammalia, Physical Sciences, Geochemistry & Geophysics, Earth sciences, Physical sciences
Abstract

Establishing the temporal sequence of the Middle-Late Jurassic Yanliao Biota is essential as it anchors the timing of many key evolutionary innovations in vertebrates. Lack of sufficiently reliable high-precision ages of fossil-bearing horizons hinders our ability to reconstruct the tempo and mode of vertebrate evolution. Here, we frame a temporal sequence of Yanliao Biota with precise age constraints for iconic vertebrates, proposing that the major vertebrate-bearing strata span from 164 Ma to 157 Ma in age. The increasing ecological diversity of mammaliaforms is well illustrated by the Middle-Late Jurassic Yanliao Biota and Early Cretaceous Jehol Biota. Incorporation of the updated temporal frameworks in Bayesian tip-dated mammaliaform phylogeny reveals that Triassic haramiyidans are separate from Jurassic taxa and unrelated to crown Mammalia. Tip-dated phylogeny supports a long-fuse model for mammal evolution, featured by a Late Triassic root and Middle-Late Jurassic interordinal diversification of crown Mammalia, showing consistency with molecular-based timetrees in divergence timing.

Published
2023

8. Igneous meteorites suggest Aluminium-26 heterogeneity in the early Solar Nebula.

Author

Krestianinov, Evgenii, Amelin, Yuri, Cary, Paige, Huyskens, Magdalena, Dey, Supratim, Hibiya, Yuki, Tang, Haolan, Young, Edward, Pack, Andreas, Di Rocco, Tommaso, Yin, Qing-Zhu, and Miller, Audrey

Abstract

The short-lived radionuclide aluminium-26 (26Al) isotope is a major heat source for early planetary melting. The aluminium-26 - magnesium-26 (26Al-26Mg) decay system also serves as a high-resolution relative chronometer. In both cases, however, it is critical to establish whether 26Al was homogeneously or heterogeneously distributed throughout the solar nebula. Here we report a precise lead-207 - lead-206 (207Pb-206Pb) isotopic age of 4565.56 ± 0.12 million years (Ma) for the andesitic achondrite Erg Chech 002. Our analysis, in conjunction with published 26Al-26Mg data, reveals that the initial 26Al/27Al in the source material of this achondrite was notably higher than in various other well-preserved and precisely dated achondrites. Here we demonstrate that the current data clearly indicate spatial heterogeneity of 26Al by a factor of 3-4 in the precursor molecular cloud or the protoplanetary disk of the Solar System, likely associated with the late infall of stellar materials with freshly synthesized radionuclides.

Published
2023

9. Abundant presolar grains and primordial organics preserved in carbon-rich exogenous clasts in asteroid Ryugu.

Author

Nguyen, Ann, Mane, Prajkta, Keller, Lindsay, Piani, Laurette, Abe, Yoshinari, Aléon, Jérôme, Alexander, Conel, Amari, Sachiko, Amelin, Yuri, Bajo, Ken-Ichi, Bizzarro, Martin, Bouvier, Audrey, Carlson, Richard, Chaussidon, Marc, Choi, Byeon-Gak, Dauphas, Nicolas, Davis, Andrew, Di Rocco, Tommaso, Fujiya, Wataru, Fukai, Ryota, Gautam, Ikshu, Haba, Makiko, Hibiya, Yuki, Hidaka, Hiroshi, Homma, Hisashi, Hoppe, Peter, Huss, Gary, Ichida, Kiyohiro, Iizuka, Tsuyoshi, Ireland, Trevor, Ishikawa, Akira, Itoh, Shoichi, Kawasaki, Noriyuki, Kita, Noriko, Kitajima, Kouki, Kleine, Thorsten, Komatani, Shintaro, Krot, Alexander, Liu, Ming-Chang, Masuda, Yuki, McKeegan, Kevin, Morita, Mayu, Motomura, Kazuko, Moynier, Frédéric, Nakai, Izumi, Nagashima, Kazuhide, Nesvorný, David, Nittler, Larry, Onose, Morihiko, Pack, Andreas, Park, Changkun, Qin, Liping, Russell, Sara, Sakamoto, Naoya, Schönbächler, Maria, Tafla, Lauren, Tang, Haolan, Terada, Kentaro, Terada, Yasuko, Usui, Tomohiro, Wada, Sohei, Wadhwa, Meenakshi, Walker, Richard, Yamashita, Katsuyuki, Yokoyama, Tetsuya, Yoneda, Shigekazu, Young, Edward, Yui, Hiroharu, Zhang, Ai-Cheng, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Sakamoto, Kanako, Yabuta, Hikaru, Abe, Masanao, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Okada, Tatsuaki, Yada, Toru, Yogata, Kasumi, Nakazawa, Satoru, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Tsuda, Yuichi, Watanabe, Sei-Ichiro, Yoshikawa, Makoto, Tachibana, Shogo, Yurimoto, Hisayoshi, and Yin, Qing-Zhu

Subjects
Carbon, Solar System, Meteoroids, Silicates
Abstract

Preliminary analyses of asteroid Ryugu samples show kinship to aqueously altered CI (Ivuna-type) chondrites, suggesting similar origins. We report identification of C-rich, particularly primitive clasts in Ryugu samples that contain preserved presolar silicate grains and exceptional abundances of presolar SiC and isotopically anomalous organic matter. The high presolar silicate abundance (104 ppm) indicates that the clast escaped extensive alteration. The 5 to 10 times higher abundances of presolar SiC (~235 ppm), N-rich organic matter, organics with N isotopic anomalies (1.2%), and organics with C isotopic anomalies (0.2%) in the primitive clasts compared to bulk Ryugu suggest that the clasts formed in a unique part of the protoplanetary disk enriched in presolar materials. These clasts likely represent previously unsampled outer solar system material that accreted onto Ryugu after aqueous alteration ceased, consistent with Ryugus rubble pile origin.

Published
2023

10. Presolar stardust in asteroid Ryugu

Author

Barosch, Jens, Nittler, Larry R., Wang, Jianhua, Alexander, Conel M. O'D., De Gregorio, Bradley T., Engrand, Cécile, Kebukawa, Yoko, Nagashima, Kazuhide, Stroud, Rhonda M., Yabuta, Hikaru, Abe, Yoshinari, Aléon, Jérôme, Amari, Sachiko, Amelin, Yuri, Bajo, Ken-ichi, Bejach, Laure, Bizzarro, Martin, Bonal, Lydie, Bouvier, Audrey, Carlson, Richard W., Chaussidon, Marc, Choi, Byeon-Gak, Cody, George D., Dartois, Emmanuel, Dauphas, Nicolas, Davis, Andrew M., Dazzi, Alexandre, Deniset-Besseau, Ariane, Di Rocco, Tommaso, Duprat, Jean, Fujiya, Wataru, Fukai, Ryota, Gautam, Ikshu, Haba, Makiko K., Hashiguchi, Minako, Hibiya, Yuki, Hidaka, Hiroshi, Homma, Hisashi, Hoppe, Peter, Huss, Gary R., Ichida, Kiyohiro, Iizuka, Tsuyoshi, Ireland, Trevor R., Ishikawa, Akira, Ito, Motoo, Itoh, Shoichi, Kamide, Kanami, Kawasaki, Noriyuki, Kilcoyne, A. L. David, Kita, Noriko T., Kitajima, Kouki, Kleine, Thorsten, Komatani, Shintaro, Komatsu, Mutsumi, Krot, Alexander N., Liu, Ming-Chang, Martins, Zita, Masuda, Yuki, Mathurin, Jérémie, McKeegan, Kevin D., Montagnac, Gilles, Morita, Mayu, Mostefaoui, Smail, Motomura, Kazuko, Moynier, Frédéric, Nakai, Izumi, Nguyen, Ann N., Ohigashi, Takuji, Okumura, Taiga, Onose, Morihiko, Pack, Andreas, Park, Changkun, Piani, Laurette, Qin, Liping, Quirico, Eric, Remusat, Laurent, Russell, Sara S., Sakamoto, Naoya, Sandford, Scott A., Schönbächler, Maria, Shigenaka, Miho, Suga, Hiroki, Tafla, Lauren, Takahashi, Yoshio, Takeichi, Yasuo, Tamenori, Yusuke, Tang, Haolan, Terada, Kentaro, Terada, Yasuko, Usui, Tomohiro, Verdier-Paoletti, Maximilien, Wada, Sohei, Wadhwa, Meenakshi, Wakabayashi, Daisuke, Walker, Richard J., Yamashita, Katsuyuki, Yamashita, Shohei, Yin, Qing-Zhu, Yokoyama, Tetsuya, Yoneda, Shigekazu, Young, Edward D., Yui, Hiroharu, Zhang, Ai-Cheng, Abe, Masanao, Miyazaki, Akiko, Nakato, Aiko, Nakazawa, Satoru, Nishimura, Masahiro, Okada, Tatsuaki, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Tsuda, Yuichi, Watanabe, Sei-ichiro, Yada, Toru, Yogata, Kasumi, Yoshikawa, Makoto, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Sakamoto, Kanako, Tachibana, Shogo, and Yurimoto, Hisayoshi

Subjects
Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics
Abstract

We have conducted a NanoSIMS-based search for presolar material in samples recently returned from C-type asteroid Ryugu as part of JAXA's Hayabusa2 mission. We report the detection of all major presolar grain types with O- and C-anomalous isotopic compositions typically identified in carbonaceous chondrite meteorites: 1 silicate, 1 oxide, 1 O-anomalous supernova grain of ambiguous phase, 38 SiC, and 16 carbonaceous grains. At least two of the carbonaceous grains are presolar graphites, whereas several grains with moderate C isotopic anomalies are probably organics. The presolar silicate was located in a clast with a less altered lithology than the typical extensively aqueously altered Ryugu matrix. The matrix-normalized presolar grain abundances in Ryugu are 4.8$^{+4.7}_{-2.6}$ ppm for O-anomalous grains, 25$^{+6}_{-5}$ ppm for SiC grains and 11$^{+5}_{-3}$ ppm for carbonaceous grains. Ryugu is isotopically and petrologically similar to carbonaceous Ivuna-type (CI) chondrites. To compare the in situ presolar grain abundances of Ryugu with CI chondrites, we also mapped Ivuna and Orgueil samples and found a total of SiC grains and 6 carbonaceous grains. No O-anomalous grains were detected. The matrix-normalized presolar grain abundances in the CI chondrites are similar to those in Ryugu: 23 $^{+7}_{-6}$ ppm SiC and 9.0$^{+5.3}_{-4.6}$ ppm carbonaceous grains. Thus, our results provide further evidence in support of the Ryugu-CI connection. They also reveal intriguing hints of small-scale heterogeneities in the Ryugu samples, such as locally distinct degrees of alteration that allowed the preservation of delicate presolar material., Comment: 12 pages, 3 figures, 2 tables. Published in ApJL

Published
2022
Full Text
View/download PDF

11. Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2

Author

Kawasaki, Noriyuki, Nagashima, Kazuhide, Sakamoto, Naoya, Matsumoto, Toru, Bajo, Ken-ichi, Wada, Sohei, Igami, Yohei, Miyake, Akira, Noguchi, Takaaki, Yamamoto, Daiki, Russell, Sara S, Abe, Yoshinari, Aléon, Jérôme, Alexander, Conel M O’D, Amari, Sachiko, Amelin, Yuri, Bizzarro, Martin, Bouvier, Audrey, Carlson, Richard W, Chaussidon, Marc, Choi, Byeon-Gak, Dauphas, Nicolas, Davis, Andrew M, Di Rocco, Tommaso, Fujiya, Wataru, Fukai, Ryota, Gautam, Ikshu, Haba, Makiko K, Hibiya, Yuki, Hidaka, Hiroshi, Homma, Hisashi, Hoppe, Peter, Huss, Gary R, Ichida, Kiyohiro, Iizuka, Tsuyoshi, Ireland, Trevor R, Ishikawa, Akira, Ito, Motoo, Itoh, Shoichi, Kita, Noriko T, Kitajima, Kouki, Kleine, Thorsten, Komatani, Shintaro, Krot, Alexander N, Liu, Ming-Chang, Masuda, Yuki, McKeegan, Kevin D, Morita, Mayu, Motomura, Kazuko, Moynier, Frédéric, Nakai, Izumi, Nguyen, Ann, Nittler, Larry, Onose, Morihiko, Pack, Andreas, Park, Changkun, Piani, Laurette, Qin, Liping, Schönbächler, Maria, Tafla, Lauren, Tang, Haolan, Terada, Kentaro, Terada, Yasuko, Usui, Tomohiro, Wadhwa, Meenakshi, Walker, Richard J, Yamashita, Katsuyuki, Yin, Qing-Zhu, Yokoyama, Tetsuya, Yoneda, Shigekazu, Young, Edward D, Yui, Hiroharu, Zhang, Ai-Cheng, Nakamura, Tomoki, Naraoka, Hiroshi, Okazaki, Ryuji, Sakamoto, Kanako, Yabuta, Hikaru, Abe, Masanao, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Okada, Tatsuaki, Yada, Toru, Yogata, Kasumi, Nakazawa, Satoru, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Tsuda, Yuichi, Watanabe, Sei-ichiro, Yoshikawa, Makoto, Tachibana, Shogo, and Yurimoto, Hisayoshi

Subjects
Earth Sciences, Physical Sciences, Space Sciences, Geology, Prevention
Abstract

The extraterrestrial materials returned from asteroid (162173) Ryugu consist predominantly of low-temperature aqueously formed secondary minerals and are chemically and mineralogically similar to CI (Ivuna-type) carbonaceous chondrites. Here, we show that high-temperature anhydrous primary minerals in Ryugu and CI chondrites exhibit a bimodal distribution of oxygen isotopic compositions: 16O-rich (associated with refractory inclusions) and 16O-poor (associated with chondrules). Both the 16O-rich and 16O-poor minerals probably formed in the inner solar protoplanetary disk and were subsequently transported outward. The abundance ratios of the 16O-rich to 16O-poor minerals in Ryugu and CI chondrites are higher than in other carbonaceous chondrite groups but are similar to that of comet 81P/Wild2, suggesting that Ryugu and CI chondrites accreted in the outer Solar System closer to the accretion region of comets.

Published
2022

12. Pyrrhotites in asteroid 162173 Ryugu: Records of the initial changes on their surfaces with aqueous alteration

Author

Yui, Hiroharu, Urashima, Shu-hei, Onose, Morihiko, Morita, Mayu, Komatani, Shintaro, Nakai, Izumi, Abe, Yoshinari, Terada, Yasuko, Homma, Hisashi, Motomura, Kazuko, Ichida, Kiyohiro, Yokoyama, Tetsuya, Nagashima, Kazuhide, Aléon, Jérôme, M. O’D. Alexander, Conel, Amari, Sachiko, Amelin, Yuri, Bajo, Ken-ichi, Bizzarro, Martin, Bouvier, Audrey, Carlson, Richard W., Chaussidon, Marc, Choi, Byeon-Gak, Dauphas, Nicolas, Davis, Andrew M., Fujiya, Wataru, Fukai, Ryota, Gautam, Ikshu, Haba, Makiko K., Hibiya, Yuki, Hidaka, Hiroshi, Hoppe, Peter, Huss, Gary R., Iizuka, Tsuyoshi, Ireland, Trevor R., Ishikawa, Akira, Itoh, Shoichi, Kawasaki, Noriyuki, Kita, Noriko T., Kitajima, Kouki, Kleine, Thorsten, Krot, Sasha, Liu, Ming-Chang, Masuda, Yuki, Moynier, Frédéric, Nguyen, Ann, Nittler, Larry, Pack, Andreas, Park, Changkun, Piani, Laurette, Qin, Liping, Di Rocco, Tommaso, Russell, Sara S., Sakamoto, Naoya, Schönbächler, Maria, Tafla, Lauren, Tang, Haolan, Terada, Kentaro, Usui, Tomohiro, Wada, Sohei, Wadhwa, Meenakshi, Walker, Richard J., Yamashita, Katsuyuki, Yin, Qing-Zhu, Yoneda, Shigekazu, Young, Edward D., Zhang, Ai-Cheng, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Sakamoto, Kanako, Yabuta, Hikaru, Abe, Masanao, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Okada, Tatsuaki, Yada, Toru, Yogata, Kasumi, Nakazawa, Satoru, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Tsuda, Yuichi, Watanabe, Sei-ichiro, Yoshikawa, Makoto, Tachibana, Shogo, and Yurimoto, Hisayoshi

Published
2024
Full Text
View/download PDF

14. Pervasive aqueous alteration in the early Solar System revealed by potassium isotopic variations in Ryugu samples and carbonaceous chondrites

Author

Hu, Yan, Moynier, Frédéric, Dai, Wei, Paquet, Marine, Yokoyama, Tetsuya, Abe, Yoshinari, Aléon, Jérôme, Alexander, Conel M. O'D., Amari, Sachiko, Amelin, Yuri, Bajo, Ken-ichi, Bizzarro, Martin, Bouvier, Audrey, Carlson, Richard W., Chaussidon, Marc, Choi, Byeon-Gak, Dauphas, Nicolas, Davis, Andrew M., Di Rocco, Tommaso, Fujiya, Wataru, Fukai, Ryota, Gautam, Ikshu, Haba, Makiko K., Hibiya, Yuki, Hidaka, Hiroshi, Homma, Hisashi, Hoppe, Peter, Huss, Gary R., Ichida, Kiyohiro, Iizuka, Tsuyoshi, Ireland, Trevor R., Ishikawa, Akira, Itoh, Shoichi, Kawasaki, Noriyuki, Kita, Noriko T., Kitajima, Koki, Kleine, Thorsten, Komatani, Shintaro, Krot, Alexander N., Liu, Ming-Chang, Masuda, Yuki, Morita, Mayu, Motomura, Kazuko, Nakai, Izumi, Nagashima, Kazuhide, Nesvorný, David, Nguyen, Ann, Nittler, Larry, Onose, Morihiko, Pack, Andreas, Park, Changkun, Piani, Laurette, Qin, Liping, Russell, Sara S., Sakamoto, Naoya, Schönbächler, Maria, Tafla, Lauren, Tang, Haolan, Terada, Kentaro, Terada, Yasuko, Usui, Tomohiro, Wada, Sohei, Wadhwa, Meenakshi, Walker, Richard J., Yamashita, Katsuyuki, Yin, Qing-Zhu, Yoneda, Shigekazu, Young, Edward D., Yui, Hiroharu, Zhang, Ai-Cheng, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Sakamoto, Kanako, Yabuta, Hikaru, Abe, Masanao, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Okada, Tatsuaki, Yada, Toru, Yogata, Kasumi, Nakazawa, Satoru, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Tsuda, Yuichi, Watanabe, Sei-ichiro, Yoshikawa, Makoto, Tachibana, Shogo, and Yurimoto, Hisayoshi

Published
2024
Full Text
View/download PDF

15. Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis

Author

Paquet, Marine, Moynier, Frederic, Yokoyama, Tetsuya, Dai, Wei, Hu, Yan, Abe, Yoshinari, Aléon, Jérôme, O’D. Alexander, Conel M., Amari, Sachiko, Amelin, Yuri, Bajo, Ken-ichi, Bizzarro, Martin, Bouvier, Audrey, Carlson, Richard W., Chaussidon, Marc, Choi, Byeon-Gak, Dauphas, Nicolas, Davis, Andrew M., Di Rocco, Tommaso, Fujiya, Wataru, Fukai, Ryota, Gautam, Ikshu, Haba, Makiko K., Hibiya, Yuki, Hidaka, Hiroshi, Homma, Hisashi, Hoppe, Peter, Huss, Gary R., Ichida, Kiyohiro, Iizuka, Tsuyoshi, Ireland, Trevor R., Ishikawa, Akira, Ito, Motoo, Itoh, Shoichi, Kawasaki, Noriyuki, Kita, Noriko T., Kitajima, Kouki, Kleine, Thorsten, Komatani, Shintaro, Krot, Alexander N., Liu, Ming-Chang, Masuda, Yuki, McKeegan, Kevin D., Morita, Mayu, Motomura, Kazuko, Nakai, Izumi, Nagashima, Kazuhide, Nesvorný, David, Nguyen, Ann N., Nittler, Larry, Onose, Morihiko, Pack, Andreas, Park, Changkun, Piani, Laurette, Qin, Liping, Russell, Sara S., Sakamoto, Naoya, Schönbächler, Maria, Tafla, Lauren, Tang, Haolan, Terada, Kentaro, Terada, Yasuko, Usui, Tomohiro, Wada, Sohei, Wadhwa, Meenakshi, Walker, Richard J., Yamashita, Katsuyuki, Yin, Qing-Zhu, Yoneda, Shigekazu, Young, Edward D., Yui, Hiroharu, Zhang, Ai-Cheng, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Sakamoto, Kanako, Yabuta, Hikaru, Abe, Masanao, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Okada, Tatsuaki, Yada, Toru, Yogata, Kasumi, Nakazawa, Satoru, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Tsuda, Yuichi, Watanabe, Sei-ichiro, Yoshikawa, Makoto, Tachibana, Shogo, and Yurimoto, Hisayoshi

Published
2023
Full Text
View/download PDF

16. Recommendations for the reporting and interpretation of isotope dilution U-Pb geochronological information

Author

Condon, Dan, primary, Schoene, Blair, additional, Schmitz, Mark, additional, Schaltegger, Urs, additional, Ickert, Ryan B., additional, Amelin, Yuri, additional, Augland, Lars E., additional, Chamberlain, Kevin R., additional, Coleman, Drew S., additional, Connelly, James N., additional, Corfu, Fernando, additional, Crowley, James L., additional, Davies, Joshua H.F.L., additional, Denyszyn, Steven W., additional, Eddy, Michael P., additional, Gaynor, Sean P., additional, Heaman, Larry M., additional, Huyskens, Magdalena H., additional, Kamo, Sandra, additional, Kasbohm, Jennifer, additional, Keller, C. Brenhin, additional, MacLennan, Scott A., additional, McLean, Noah M., additional, Noble, Stephen, additional, Ovtcharova, Maria, additional, Paul, André, additional, Ramezani, Jahandar, additional, Rioux, Matt, additional, Sahy, Diana, additional, Scoates, James S., additional, Szymanowski, Dawid, additional, Tapster, Simon, additional, Tichomirowa, Marion, additional, Wall, Corey J., additional, Wotzlaw, Jörn-Frederik, additional, Yang, Chuan, additional, and Yin, Qing-Zhu, additional

Published
2024
Full Text
View/download PDF

17. Disequilibrium oxygen isotope distribution among aqueously altered minerals in Ryugu asteroid returned samples

Author

Kita, Noriko T., primary, Kitajima, Kouki, additional, Nagashima, Kazuhide, additional, Kawasaki, Noriyuki, additional, Sakamoto, Naoya, additional, Fujiya, Wataru, additional, Abe, Yoshinari, additional, Aléon, Jérôme, additional, Alexander, Conel M. O'D., additional, Amari, Sachiko, additional, Amelin, Yuri, additional, Bajo, Ken‐ichi, additional, Bizzarro, Martin, additional, Bouvier, Audrey, additional, Carlson, Richard W., additional, Chaussidon, Marc, additional, Choi, Byeon‐Gak, additional, Dauphas, Nicolas, additional, Davis, Andrew M., additional, Di Rocco, Tommaso, additional, Fukai, Ryota, additional, Gautam, Ikshu, additional, Haba, Makiko K., additional, Hibiya, Yuki, additional, Hidaka, Hiroshi, additional, Homma, Hisashi, additional, Hoppe, Peter, additional, Huss, Gary R., additional, Ichida, Kiyohiro, additional, Iizuka, Tsuyoshi, additional, Ireland, Trevor R., additional, Ishikawa, Akira, additional, Itoh, Shoichi, additional, Kleine, Thorsten, additional, Komatani, Shintaro, additional, Krot, Alexander N., additional, Liu, Ming‐Chang, additional, Masuda, Yuki, additional, McKeegan, Kevin D., additional, Morita, Mayu, additional, Motomura, Kazuko, additional, Moynier, Frédéric, additional, Nakai, Izumi, additional, Nguyen, Ann, additional, Nittler, Larry, additional, Onose, Morihiko, additional, Pack, Andreas, additional, Park, Changkun, additional, Piani, Laurette, additional, Qin, Liping, additional, Russell, Sara S., additional, Schönbächler, Maria, additional, Tafla, Lauren, additional, Tang, Haolan, additional, Terada, Kentaro, additional, Terada, Yasuko, additional, Usui, Tomohiro, additional, Wada, Sohei, additional, Wadhwa, Meenakshi, additional, Walker, Richard J., additional, Yamashita, Katsuyuki, additional, Yin, Qing‐Zhu, additional, Yokoyama, Tetsuya, additional, Yoneda, Shigekazu, additional, Young, Edward D., additional, Yui, Hiroharu, additional, Zhang, Ai‐Cheng, additional, Nakamura, Tomoki, additional, Naraoka, Hiroshi, additional, Noguchi, Takaaki, additional, Okazaki, Ryuji, additional, Sakamoto, Kanako, additional, Yabuta, Hikaru, additional, Abe, Masanao, additional, Miyazaki, Akiko, additional, Nakato, Aiko, additional, Nishimura, Masahiro, additional, Okada, Tatsuaki, additional, Yada, Toru, additional, Yogata, Kasumi, additional, Nakazawa, Satoru, additional, Saiki, Takanao, additional, Tanaka, Satoshi, additional, Terui, Fuyuto, additional, Tsuda, Yuichi, additional, Watanabe, Sei‐ichiro, additional, Yoshikawa, Makoto, additional, Tachibana, Shogo, additional, and Yurimoto, Hisayoshi, additional

Published
2024
Full Text
View/download PDF

21. The initial abundance and distribution of 92Nb in the Solar System

Author

Iizuka, Tsuyoshi, Lai, Yi-Jen, Akram, Waheed, Amelin, Yuri, and Schönbächler, Maria

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics
Abstract

Niobium-92 is an extinct proton-rich nuclide, which decays to 92Zr with a half-life of 37 Ma. This radionuclide potentially offers a unique opportunity to determine the timescales of early Solar System processes and the site(s) of nucleosynthesis for p-nuclei, once its initial abundance and distribution in the Solar System are well established. Here we present internal Nb-Zr isochrons for three basaltic achondrites with known U-Pb ages: the angrite NWA 4590, the eucrite Agoult, and the ungrouped achondrite Ibitira. Our results show that the relative Nb-Zr isochron ages of the three meteorites are consistent with the time intervals obtained from the Pb-Pb chronometer for pyroxene and plagioclase, indicating that 92Nb was homogeneously distributed among their source regions. The Nb-Zr and Pb-Pb data for NWA 4590 yield the most reliable and precise reference point for anchoring the Nb-Zr chronometer to the absolute timescale: an initial 92Nb/93Nb ratio of $(1.4 \pm 0.5) \times 10^{-5}$ at $4557.93 \pm 0.36$ Ma, which corresponds to a 92Nb/93Nb ratio of $(1.7 \pm 0.6) \times 10^{-5}$ at the time of the Solar System formation. On the basis of this new initial ratio, we demonstrate the capability of the Nb-Zr chronometer to date early Solar System objects including troilite and rutile, such as iron and stony-iron meteorites. Furthermore, we estimate a nucleosynthetic production ratio of 92Nb to the p-nucleus 92Mo between 0.0015 and 0.035. This production ratio, together with the solar abundances of other p-nuclei with similar masses, can be best explained if these light p-nuclei were primarily synthesized by photodisintegration reactions in Type Ia supernovae., Comment: Accepted to Earth and Planetary Science Letters

Published
2016
Full Text
View/download PDF

22. Author Correction: Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis

Author

Paquet, Marine, Moynier, Frederic, Yokoyama, Tetsuya, Dai, Wei, Hu, Yan, Abe, Yoshinari, Aléon, Jérôme, O’D. Alexander, Conel M., Amari, Sachiko, Amelin, Yuri, Bajo, Ken-ichi, Bizzarro, Martin, Bouvier, Audrey, Carlson, Richard W., Chaussidon, Marc, Choi, Byeon-Gak, Dauphas, Nicolas, Davis, Andrew M., Di Rocco, Tommaso, Fujiya, Wataru, Fukai, Ryota, Gautam, Ikshu, Haba, Makiko K., Hibiya, Yuki, Hidaka, Hiroshi, Homma, Hisashi, Hoppe, Peter, Huss, Gary R., Ichida, Kiyohiro, Iizuka, Tsuyoshi, Ireland, Trevor R., Ishikawa, Akira, Ito, Motoo, Itoh, Shoichi, Kawasaki, Noriyuki, Kita, Noriko T., Kitajima, Kouki, Kleine, Thorsten, Komatani, Shintaro, Krot, Alexander N., Liu, Ming-Chang, Masuda, Yuki, McKeegan, Kevin D., Morita, Mayu, Motomura, Kazuko, Nakai, Izumi, Nagashima, Kazuhide, Nesvorný, David, Nguyen, Ann N., Nittler, Larry, Onose, Morihiko, Pack, Andreas, Park, Changkun, Piani, Laurette, Qin, Liping, Russell, Sara S., Sakamoto, Naoya, Schönbächler, Maria, Tafla, Lauren, Tang, Haolan, Terada, Kentaro, Terada, Yasuko, Usui, Tomohiro, Wada, Sohei, Wadhwa, Meenakshi, Walker, Richard J., Yamashita, Katsuyuki, Yin, Qing-Zhu, Yoneda, Shigekazu, Young, Edward D., Yui, Hiroharu, Zhang, Ai-Cheng, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Sakamoto, Kanako, Yabuta, Hikaru, Abe, Masanao, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Okada, Tatsuaki, Yada, Toru, Yogata, Kasumi, Nakazawa, Satoru, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Tsuda, Yuichi, Watanabe, Sei-ichiro, Yoshikawa, Makoto, Tachibana, Shogo, and Yurimoto, Hisayoshi

Published
2023
Full Text
View/download PDF

24. Analysis of Cation Composition in Dolomites on the Intact Particles Sampled from Asteroid Ryugu

Author

Morita, Mayu, Yui, Hiroharu, Urashima, Shu Hei, Onose, Morihiko, Komatani, Shintaro, Nakai, Izumi, Abe, Yoshinari, Terada, Yasuko, Homma, Hisashi, Motomura, Kazuko, Ichida, Kiyohiro, Yokoyama, Tetsuya, Nagashima, Kazuhide, Aléon, Jérôme, Conel, Conel M., Amari, Sachiko, Amelin, Yuri, Bajo, Ken-ichi, Bizzarro, Martin, Bouvier, Audrey, Carlson, Richard W., Chaussidon, Marc, Choi, Byeon-Gak, Dauphas, Nicolas, Davis, Andrew M., Fujiya, Wataru, Fukai, Ryota, Gautam, Ikshu, Haba, Makiko K., Hibiya, Yuki, Hidaka, Hiroshi, Hoppe, Peter, Huss, Gary R., Iizuka, Tsuyoshi, Ireland, Trevor R., Ishikawa, Akira, Itoh, Shoichi, Kawasaki, Noriyuki, Kita, Noriko T., Kitajima, Kouki, Kleine, Thorsten, Krot, Sasha, Liu, Ming-Chang, Masuda, Yuki, Moynier, Frédéric, Nguyen, Ann, Nittler, Larry, Pack, Andreas, Park, Changkun, Piani, Laurette, Qin, Liping, Rocco, Tommaso Di, Russell, Sara S., Sakamoto, Naoya, Schönbächler, Maria, Tafla, Lauren, Tang, Haolan, Terada, Kentaro, Usui, Tomohiro, Wada, Sohei, Wadhwa, Meenakshi, Walker, Richard J., Yamashita, Katsuyuki, Yin, Qing-Zhu, Yoneda, Shigekazu, Young, Edward D., Zhang, Ai-Cheng, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Sakamoto, Kanako, Yabuta, Hikaru, Abe, Masanao, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Okada, Tatsuaki, Yada, Toru, Yogata, Kasumi, Nakazawa, Satoru, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Tsuda, Yuichi, Watanabe, Sei-ichiro, Yoshikawa, Makoto, Tachibana, Shogo, Yurimoto, Hisayoshi, Morita, Mayu, Yui, Hiroharu, Urashima, Shu Hei, Onose, Morihiko, Komatani, Shintaro, Nakai, Izumi, Abe, Yoshinari, Terada, Yasuko, Homma, Hisashi, Motomura, Kazuko, Ichida, Kiyohiro, Yokoyama, Tetsuya, Nagashima, Kazuhide, Aléon, Jérôme, Conel, Conel M., Amari, Sachiko, Amelin, Yuri, Bajo, Ken-ichi, Bizzarro, Martin, Bouvier, Audrey, Carlson, Richard W., Chaussidon, Marc, Choi, Byeon-Gak, Dauphas, Nicolas, Davis, Andrew M., Fujiya, Wataru, Fukai, Ryota, Gautam, Ikshu, Haba, Makiko K., Hibiya, Yuki, Hidaka, Hiroshi, Hoppe, Peter, Huss, Gary R., Iizuka, Tsuyoshi, Ireland, Trevor R., Ishikawa, Akira, Itoh, Shoichi, Kawasaki, Noriyuki, Kita, Noriko T., Kitajima, Kouki, Kleine, Thorsten, Krot, Sasha, Liu, Ming-Chang, Masuda, Yuki, Moynier, Frédéric, Nguyen, Ann, Nittler, Larry, Pack, Andreas, Park, Changkun, Piani, Laurette, Qin, Liping, Rocco, Tommaso Di, Russell, Sara S., Sakamoto, Naoya, Schönbächler, Maria, Tafla, Lauren, Tang, Haolan, Terada, Kentaro, Usui, Tomohiro, Wada, Sohei, Wadhwa, Meenakshi, Walker, Richard J., Yamashita, Katsuyuki, Yin, Qing-Zhu, Yoneda, Shigekazu, Young, Edward D., Zhang, Ai-Cheng, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Sakamoto, Kanako, Yabuta, Hikaru, Abe, Masanao, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Okada, Tatsuaki, Yada, Toru, Yogata, Kasumi, Nakazawa, Satoru, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Tsuda, Yuichi, Watanabe, Sei-ichiro, Yoshikawa, Makoto, Tachibana, Shogo, and Yurimoto, Hisayoshi

Abstract

Characterization of the elemental distribution of samples with rough surfaces has been strongly desired for the analysis of various natural and artificial materials. Particularly for pristine and rare analytes with micrometer sizes embedded on specimen surfaces, non-invasive and matrix effect-free analysis is required without surface polishing treatment. To satisfy these requirements, we proposed a new method employing the sequential combination of two imaging modalities, i.e., microenergy-dispersive X-ray fluorescence (micro-XRF) and Raman micro-spectroscopy. The applicability of the developed method is tested by the quantitative analysis of cation composition in micrometer-sized carbonate grains on the surfaces of intact particles sampled directly from the asteroid Ryugu. The first step of micro-XRF imaging enabled a quick search for the sparsely scattered and micrometer-sized carbonates by the codistributions of Ca2+ and Mn2+ on the Mg2+- and Fe2+-rich phyllosilicate matrix. The following step of Raman micro-spectroscopy probed the carbonate grains and analyzed their cation composition (Ca2+, Mg2+, and Fe2+ + Mn2+) in a matrix effect-free manner via the systematic Raman shifts of the lattice modes. The carbonates were basically assigned to ferroan dolomite bearing a considerable amount of Fe2+ + Mn2+ at around 10 atom %. These results are in good accordance with the assignments reported by scanning electron microscopy-energy-dispersive X-ray spectroscopy, where the thin-sectioned and surface-polished Ryugu particles were applicable. The proposed method requires neither sectioning nor surface polishing; hence, it can be applied to the remote sensing apparatus on spacecrafts and planetary rovers. Furthermore, the non-invasive and matrix effect-free characterization will provide a reliable analytical tool for quantitative analysis of the elemental distrib

Published
2024

25. Recommendations for the reporting and interpretation of isotope dilution U-Pb geochronological information

Author

Condon, Dan, Schoene, Blair, Schmitz, Mark, Schaltegger, Urs, Ickert, Ryan B., Amelin, Yuri, Augland, Lars E., Chamberlain, Kevin R., Coleman, Drew S., Connelly, James N., Corfu, Fernando, Crowley, James L., Davies, Joshua H.F.L., Denyszyn, Steven W., Eddy, Michael P., Gaynor, Sean P., Heaman, Larry M., Huyskens, Magdalena H., Kamo, Sandra, Kasbohm, Jennifer, Keller, C. Brenhin, MacLennan, Scott A., McLean, Noah M., Noble, Stephen, Ovtcharova, Maria, Paul, André, Ramezani, Jahandar, Rioux, Matt, Sahy, Diana, Scoates, James S., Szymanowski, Dawid, Tapster, Simon, Tichomirowa, Marion, Wall, Corey J., Wotzlaw, Jörn-Frederik, Yang, Chuan, Yin, Qing-Zhu, Condon, Dan, Schoene, Blair, Schmitz, Mark, Schaltegger, Urs, Ickert, Ryan B., Amelin, Yuri, Augland, Lars E., Chamberlain, Kevin R., Coleman, Drew S., Connelly, James N., Corfu, Fernando, Crowley, James L., Davies, Joshua H.F.L., Denyszyn, Steven W., Eddy, Michael P., Gaynor, Sean P., Heaman, Larry M., Huyskens, Magdalena H., Kamo, Sandra, Kasbohm, Jennifer, Keller, C. Brenhin, MacLennan, Scott A., McLean, Noah M., Noble, Stephen, Ovtcharova, Maria, Paul, André, Ramezani, Jahandar, Rioux, Matt, Sahy, Diana, Scoates, James S., Szymanowski, Dawid, Tapster, Simon, Tichomirowa, Marion, Wall, Corey J., Wotzlaw, Jörn-Frederik, Yang, Chuan, and Yin, Qing-Zhu

Abstract

U-Pb geochronology by isotope dilution−thermal ionization mass spectrometry (ID-TIMS) has the potential to be the most precise and accurate of the deep time chronometers, especially when applied to high-U minerals such as zircon. Continued analytical improvements have made this technique capable of regularly achieving better than 0.1% precision and accuracy of dates from commonly occurring high-U minerals across a wide range of geological ages and settings. To help maximize the long-term utility of published results, we present and discuss some recommendations for reporting ID-TIMS U-Pb geochronological data and associated metadata in accordance with accepted principles of data management. Further, given that the accuracy of reported ages typically depends on the interpretation applied to a set of individual dates, we discuss strategies for data interpretation. We anticipate that this paper will serve as an instructive guide for geologists who are publishing ID-TIMS U-Pb data, for laboratories generating the data, the wider geoscience community who use such data, and also editors of journals who wish to be informed about community standards. Combined, our recommendations should increase the utility, veracity, versatility, and “half-life” of ID-TIMS U-Pb geochronological data.

Published
2024

26. Neodymium‐142 deficits and samarium neutron stratigraphy of C‐type asteroid (162173) Ryugu.

Author

Torrano, Zachary A., Jordan, Michelle K., Mock, Timothy D., Carlson, Richard W., Gautam, Ikshu, Haba, Makiko K., Yokoyama, Tetsuya, Abe, Yoshinari, Aléon, Jérôme, Alexander, Conel, Amari, Sachiko, Amelin, Yuri, Bajo, Ken‐ichi, Bizzarro, Martin, Bouvier, Audrey, Chaussidon, Marc, Choi, Byeon‐Gak, Dauphas, Nicolas, Davis, Andrew M., and Di Rocco, Tommaso

Subjects
GALACTIC cosmic rays, NEUTRON capture, MASS spectrometers, CHONDRITES, SAMARIUM
Abstract

We report Nd and Sm isotopic compositions of four samples of Ryugu returned by the Hayabusa2 mission, including "A" (first touchdown) and "C" (second touchdown) samples, and several carbonaceous chondrites to evaluate potential genetic relationships between Ryugu and known chondrite groups and track the cosmic ray exposure history of Ryugu. We resolved Nd and Sm isotopic anomalies in small (<20 ng Nd and Sm) sample sizes via thermal ionization mass spectrometer using 1013 Ω amplifiers. Ryugu samples exhibit resolvable negative μ142Nd values consistent with carbonaceous chondrite values, suggesting that Ryugu is related to the parent bodies of carbonaceous chondrites. Ryugu's negative μ149Sm values are the result of exposure to galactic cosmic rays, as demonstrated by the correlation between 150Sm/152Sm and 149Sm/152Sm ratios that fall along the expected neutron capture correlation line. The neutron fluence calculated in the "A" samples (2.75 ± 1.94 × 1015 n cm−2) is slightly higher compared to the "C" samples (0.95 ± 2.04 × 1015 n cm−2), though overlapping within measurement uncertainty. The Sm results for Ryugu, at this level of precision, thus are consistent with a well‐mixed surface layer at least to the depths from which the "A" and "C" samples derive. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

31. Neodymium‐142 deficits and samarium neutron stratigraphy of C‐type asteroid (162173) Ryugu

Author

Torrano, Zachary A., primary, Jordan, Michelle K., additional, Mock, Timothy D., additional, Carlson, Richard W., additional, Gautam, Ikshu, additional, Haba, Makiko K., additional, Yokoyama, Tetsuya, additional, Abe, Yoshinari, additional, Aléon, Jérôme, additional, Alexander, Conel, additional, Amari, Sachiko, additional, Amelin, Yuri, additional, Bajo, Ken‐ichi, additional, Bizzarro, Martin, additional, Bouvier, Audrey, additional, Chaussidon, Marc, additional, Choi, Byeon‐Gak, additional, Dauphas, Nicolas, additional, Davis, Andrew M., additional, Di Rocco, Tommaso, additional, Fujiya, Wataru, additional, Fukai, Ryota, additional, Hibiya, Yuki, additional, Hidaka, Hiroshi, additional, Homma, Hisashi, additional, Hoppe, Peter, additional, Huss, Gary R., additional, Ichida, Kiyohiro, additional, Iizuka, Tsuyoshi, additional, Ireland, Trevor, additional, Ishikawa, Akira, additional, Itoh, Shoichi, additional, Kawasaki, Noriyuki, additional, Kita, Noriko T., additional, Kitajima, Koki, additional, Kleine, Thorsten, additional, Komatani, Shintaro, additional, Krot, Alexander N., additional, Liu, Ming‐Chang, additional, Masuda, Yuki, additional, McKeegan, Kevin D., additional, Morita, Mayu, additional, Motomura, Kazuko, additional, Moynier, Frédéric, additional, Nakai, Izumi, additional, Nagashima, Kazuhide, additional, Nguyen, Ann, additional, Nittler, Larry, additional, Onose, Morihiko, additional, Pack, Andreas, additional, Park, Changkun, additional, Piani, Laurette, additional, Qin, Liping, additional, Russell, Sara, additional, Sakamoto, Naoya, additional, Schönbächler, Maria, additional, Tafla, Lauren, additional, Tang, Haolan, additional, Terada, Kentaro, additional, Terada, Yasuko, additional, Usui, Tomohiro, additional, Wada, Sohei, additional, Wadhwa, Meenakshi, additional, Walker, Richard J., additional, Yamashita, Katsuyuki, additional, Yin, Qing‐Zhu, additional, Yoneda, Shigekazu, additional, Young, Edward D., additional, Yui, Hiroharu, additional, Zhang, Ai‐Cheng, additional, Nakamura, Tomoki, additional, Naraoka, Hiroshi, additional, Noguchi, Takaaki, additional, Okazaki, Ryuji, additional, Sakamoto, Kanako, additional, Yabuta, Hikaru, additional, Abe, Masanao, additional, Miyazaki, Akiko, additional, Nakato, Aiko, additional, Nishimura, Masahiro, additional, Okada, Tatsuaki, additional, Yada, Toru, additional, Yogata, Kasumi, additional, Nakazawa, Satoru, additional, Saiki, Takanao, additional, Tanaka, Satoshi, additional, Terui, Fuyuto, additional, Tsuda, Yuichi, additional, Watanabe, Sei‐ichiro, additional, Yoshikawa, Makoto, additional, Tachibana, Shogo, additional, and Yurimoto, Hisayoshi, additional

Published
2023
Full Text
View/download PDF

38. The Magnesium Isotope Composition of Samples Returned from Asteroid Ryugu

Author

Bizzarro, Martin, primary, Schiller, Martin, additional, Yokoyama, Tetsuya, additional, Abe, Yoshinari, additional, Aléon, Jérôme, additional, Alexander, Conel M. O’D., additional, Amari, Sachiko, additional, Amelin, Yuri, additional, Bajo, Ken-ichi, additional, Bouvier, Audrey, additional, Carlson, Richard W., additional, Chaussidon, Marc, additional, Choi, Byeon-Gak, additional, Dauphas, Nicolas, additional, Davis, Andrew M., additional, Di Rocco, Tommaso, additional, Fujiya, Wataru, additional, Fukai, Ryota, additional, Gautam, Ikshu, additional, Haba, Makiko K., additional, Hibiya, Yuki, additional, Hidaka, Hiroshi, additional, Homma, Hisashi, additional, Hoppe, Peter, additional, Huss, Gary R., additional, Ichida, Kiyohiro, additional, Iizuka, Tsuyoshi, additional, Ireland, Trevor R., additional, Ishikawa, Akira, additional, Itoh, Shoichi, additional, Kawasaki, Noriyuki, additional, Kita, Noriko T., additional, Kitajima, Kouki, additional, Kleine, Thorsten, additional, Komatani, Shintaro, additional, Krot, Alexander N., additional, Liu, Ming-Chang, additional, Masuda, Yuki, additional, Morita, Mayu, additional, Moynier, Fréderic, additional, Motomura, Kazuko, additional, Nakai, Izumi, additional, Nagashima, Kazuhide, additional, Nesvorný, David, additional, Nguyen, Ann, additional, Nittler, Larry, additional, Onose, Morihiko, additional, Pack, Andreas, additional, Park, Changkun, additional, Piani, Laurette, additional, Qin, Liping, additional, Russell, Sara S., additional, Sakamoto, Naoya, additional, Schönbächler, Maria, additional, Tafla, Lauren, additional, Tang, Haolan, additional, Terada, Kentaro, additional, Terada, Yasuko, additional, Usui, Tomohiro, additional, Wada, Sohei, additional, Wadhwa, Meenakshi, additional, Walker, Richard J., additional, Yamashita, Katsuyuki, additional, Yin, Qing-Zhu, additional, Yoneda, Shigekazu, additional, Young, Edward D., additional, Yui, Hiroharu, additional, Zhang, Ai-Cheng, additional, Nakamura, Tomoki, additional, Naraoka, Hiroshi, additional, Noguchi, Takaaki, additional, Okazaki, Ryuji, additional, Sakamoto, Kanako, additional, Yabuta, Hikaru, additional, Abe, Masanao, additional, Miyazaki, Akiko, additional, Nakato, Aiko, additional, Nishimura, Masahiro, additional, Okada, Tatsuaki, additional, Yada, Toru, additional, Yogata, Kasumi, additional, Nakazawa, Satoru, additional, Saiki, Takanao, additional, Tanaka, Satoshi, additional, Terui, Fuyuto, additional, Tsuda, Yuichi, additional, Watanabe, Sei-ichiro, additional, Yoshikawa, Makoto, additional, Tachibana, Shogo, additional, and Yurimoto, Hisayoshi, additional

Published
2023
Full Text
View/download PDF

39. Temporal framework for the Yanliao Biota and timing of the origin of crown mammals

Author

Yu, Zhiqiang, primary, Wang, Haibing, additional, Zhang, Chi, additional, Dong, Liping, additional, Huyskens, Magdalena H., additional, Cui, Zexian, additional, Cary, Paige, additional, Di, Yankun, additional, Amelin, Yuri, additional, Li, Gang, additional, Li, Qiuli, additional, Xia, Xiao-Ping, additional, Deng, Chenglong, additional, Wang, Yuanqing, additional, He, Huaiyu, additional, and Yin, Qing-Zhu, additional

Published
2023
Full Text
View/download PDF

40. The Oxygen Isotopic Composition of Samples Returned from Asteroid Ryugu with Implications for the Nature of the Parent Planetesimal

Author

Tang, Haolan, primary, Young, Edward D., additional, Tafla, Lauren, additional, Pack, Andreas, additional, Di Rocco, Tommaso, additional, Abe, Yoshinari, additional, Aléon, Jérôme, additional, M. O’D. Alexander, Conel, additional, Amari, Sachiko, additional, Amelin, Yuri, additional, Bajo, Ken-ichi, additional, Bizzarro, Martin, additional, Bouvier, Audrey, additional, Carlson, Richard W., additional, Chaussidon, Marc, additional, Choi, Byeon-Gak, additional, Dauphas, Nicolas, additional, Davis, Andrew M., additional, Fujiya, Wataru, additional, Fukai, Ryota, additional, Gautam, Ikshu, additional, Haba, Makiko K., additional, Hibiya, Yuki, additional, Hidaka, Hiroshi, additional, Homma, Hisashi, additional, Hoppe, Peter, additional, Huss, Gary R., additional, Ichida, Kiyohiro, additional, Iizuka, Tsuyoshi, additional, Ireland, Trevor R., additional, Ishikawa, Akira, additional, Ito, Motoo, additional, Itoh, Shoichi, additional, Kawasaki, Noriyuki, additional, Kita, Noriko T., additional, Kitajima, Kouki, additional, Kleine, Thorsten, additional, Komatani, Shintaro, additional, Krot, Alexander N., additional, Liu, Ming-Chang, additional, Masuda, Yuki, additional, McKeegan, Kevin D., additional, Morita, Mayu, additional, Motomura, Kazuko, additional, Moynier, Frédéric, additional, Nagashima, Kazuhide, additional, Nakai, Izumi, additional, Nguyen, Ann, additional, Nittler, Larry, additional, Onose, Morihiko, additional, Park, Changkun, additional, Piani, Laurette, additional, Qin, Liping, additional, Russell, Sara S., additional, Sakamoto, Naoya, additional, Schönbächler, Maria, additional, Terada, Kentaro, additional, Terada, Yasuko, additional, Usui, Tomohiro, additional, Wada, Sohei, additional, Wadhwa, Meenakshi, additional, Walker, Richard J., additional, Yamashita, Katsuyuki, additional, Yin, Qing-Zhu, additional, Yokoyama, Tetsuya, additional, Yoneda, Shigekazu, additional, Yui, Hiroharu, additional, Zhang, Ai-Cheng, additional, Nakamura, Tomoki, additional, Naraoka, Hiroshi, additional, Noguchi, Takaaki, additional, Okazaki, Ryuji, additional, Sakamoto, Kanako, additional, Yabuta, Hikaru, additional, Abe, Masanao, additional, Miyazaki, Akiko, additional, Nakato, Aiko, additional, Nishimura, Masahiro, additional, Okada, Tatsuaki, additional, Yada, Toru, additional, Yogata, Kasumi, additional, Nakazawa, Satoru, additional, Saiki, Takanao, additional, Tanaka, Satoshi, additional, Terui, Fuyuto, additional, Tsuda, Yuichi, additional, Watanabe, Sei-ichiro, additional, Yoshikawa, Makoto, additional, Tachibana, Shogo, additional, and Yurimoto, Hisayoshi, additional

Published
2023
Full Text
View/download PDF

43. Effect of chemical abrasion of zircon on SHRIMP U/Pb, δ18O, Trace element, and LA-ICPMS trace element and Lu-Hf isotopic analyses.

Author

Kooymans, Cate, Magee Jr., Charles W., Waltenberg, Kathryn, Evans, Noreen, Bodorkos, Simon, Amelin, Yuri, Kamo, Sandra, and Ireland, Trevor

Subjects
ISOTOPIC analysis, ZIRCON, SHRIMPS, CHEMICAL processes, REFERENCE sources, LUTETIUM compounds
Abstract

Chemical abrasion improves the U/Pb systematics of SHRIMP analyses of reference zircons, while leaving other isotopic systems largely unchanged. SHRIMP 206Pb/238U ages of chemically abraded reference materials TEMORA 2, 91500, QGNG, and OG1 are precise to within 0.25 to 0.4 %, and are within uncertainty of chemically abraded TIMS reference ages, while SHRIMP 206Pb/238U ages of untreated zircons are within uncertainty of TIMS ages of zircons which are untreated by chemical abrasion. Chemically abraded and untreated zircons appear to cross-calibrate within uncertainty using all but one possible permutations of reference materials, provided that the corresponding chemically abraded or untreated reference age is used for the appropriate material. In the case of reference zircons QGNG and OG1, which are slightly discordant, the SHRIMP U-Pb ages of chemically abraded and untreated material differ beyond their respective 95 % confidence intervals. SHRIMP U/Pb analysis of chemically abraded zircons with multiple growth stages are more difficult to interpret. Treated igneous rims on zircons from the S-type Mount Painter Volcanics are much lower in common Pb than the rims on untreated zircons. However, the analyses of chemically abraded material show excess scatter. Chemical abrasion also changes the relative abundance of the ages of zircon cores inherited from the sedimentary protolith, presumably due to some populations being more likely to survive the chemical abrasion process than others. We consider these results from inherited S-type zircon cores to be indicative of results for detrital zircons from unmelted sediments. Trace element, δ18O, and εHf analyses were also performed on these zircons. None of these systems showed substantial changes as a result of chemical abrasion. The most discordant reference material, OG1, showed a loss of OH as a result of chemical abrasion, presumably due to dissolution of hydrous metamict domains, or thermal dehydration during the annealing step of chemical abrasion. In no case did zircons gain fluorine due to exchange of lattice-bound substituted OH or other anions with fluorine during the HF partial dissolution phase of the chemical abrasion process. As the OG1, QGNG, and TEMORA 2 zircons are known to be compositionally inhomogenous in trace element composition, spot-to-spot differences dominated the trace element results. Even the 91500 megacrystic zircon exhibited substantial chip-to-chip variation. The LREE in chemically abraded OG1 and TEMORA 2 were lower than in the untreated samples. Ti and phosphorus saturation ((Y+REE)/P) were generally unchanged in all samples. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

44. List of Contributors

Author

Amelin, Yuri, primary, Arndt, Nicholas T., additional, Artemenko, Gennadiy, additional, Bai, Wenqian, additional, Baker, Darcy, additional, Barnes, Stephen J., additional, Bauer, Ann M., additional, Bauer, Robert L., additional, Baumgartner, Raphael, additional, Belcher, Richard W., additional, Bennett, Vickie C., additional, Bhandari, Ankit, additional, Bickford, Marion E., additional, Blichert-Toft, Janne, additional, Bogdanova, Svetlana, additional, Böhm, Christian O., additional, Bourdon, Bernard, additional, Byerly, Gary R., additional, Carlson, Richard W., additional, Cates, Nicole, additional, Cavalazzi, Barbara, additional, Cavosie, Aaron J., additional, Chacko, Thomas, additional, Chagondah, Godfrey, additional, Chamberlain, Kevin R., additional, Champion, David C., additional, Claesson, Stefan, additional, Condie, Kent C., additional, Cummins, Brendan, additional, Davatzes, Alexandra Krull, additional, Dey, Sukanta, additional, Djokic, Tara, additional, Dong, Chunyan, additional, Dziggel, Annika, additional, Elis Hoffmann, J., additional, Francis, Don, additional, Friend, Clark R.L., additional, Gaur, Yashvardhan, additional, Goderis, Steven, additional, Griffin, William L., additional, Guitreau, Martin, additional, Hangqiang, Xie, additional, Harley, Simon L., additional, Hartlaub, Russell P., additional, Heaman, Larry M., additional, Heilimo, Esa, additional, Heubeck, Christoph, additional, Hickman-Lewis, Keyron, additional, Hofmann, Axel, additional, Hölttä, Pentti, additional, Huhma, Hannu, additional, Huston, David L., additional, Kamenov, George D., additional, Kasting, James F., additional, Kelly, Nigel M., additional, Kemp, Anthony I.S., additional, Kisters, Alexander F.M., additional, Kontinen, Asko, additional, Kröner, Alfred, additional, Kusiak, Monika A., additional, Lauri, Laura, additional, Ledevin, Morgane, additional, Lemirre, Baptiste, additional, Levine, Evelyn Y., additional, Li, Yuan, additional, Liu, Dunyi, additional, Liu, Yongsheng, additional, Liu, Shoujie, additional, Lowe, Donald R., additional, Lu, Yongjun, additional, Ma, Mingzhu, additional, Mernagh, Terrence P., additional, Mitra, Aniruddha, additional, Mojzsis, Stephen J., additional, Mondal, Sudipto, additional, Morant, Peter, additional, Moyen, Jean-Francois, additional, Mueller, Paul A., additional, Muller, Elodie, additional, Nagel, Thorsten J., additional, Nandy, Jinia, additional, Nasipuri, Pritam, additional, Norman, Marc D., additional, Nutman, Allen P., additional, O'Neil, Jonathan, additional, O'Neill, Craig, additional, O'Reilly, Suzanne Y., additional, Papineau, Dominic, additional, Pati, Jayanta K., additional, Philippot, Pascal, additional, Pirajno, Franco, additional, Poole, Greg, additional, Reimink, Jesse R., additional, Rollion-Bard, Claire, additional, Roth, Antoine S.G., additional, Saha, Lopamudra, additional, Samson, Scott D., additional, Sarkar, Saheli, additional, Satkoski, Aaron M., additional, Satyanaryanan, Manavan, additional, Schmitz, Mark D., additional, Shields, Graham A., additional, Shumlyanskyy, Leonid, additional, Simonson, Bruce M., additional, Slabunov, Alexandr, additional, Smithies, Robert H., additional, Spaggiari, Catherine, additional, Steller, Luke, additional, Stevens, Gary, additional, Sugitani, Kenichiro, additional, Tadbiri, Sahand, additional, Topno, Abhishek, additional, Valley, John W., additional, Van Kranendonk, Martin J., additional, van Zuilen, Mark A., additional, Wan, Yusheng, additional, Westall, Frances, additional, Wilde, Simon A., additional, Wingate, Michael T.D., additional, Wooden, Joseph L., additional, Wyche, Stephen, additional, Xie, Hangqiang, additional, Xie, Shiwen, additional, Zhang, Chao, additional, Zhang, Siqi, additional, and Zong, Keqing, additional

Published
2019
Full Text
View/download PDF

47. Meteorites (U–Pb)

Author

Amelin, Yuri, Jack Rink, W., editor, Thompson, Jeroen W., editor, Heaman, Larry M., Advisory editor, Jull, A. J. Timothy, Advisory editor, and Paces, James B., Advisory editor

Published
2015
Full Text
View/download PDF

48. Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu

Author

Piani, Laurette, primary, Nagashima, Kazuhide, additional, Kawasaki, Noriyuki, additional, Sakamoto, Naoya, additional, Bajo, Ken-ichi, additional, Abe, Yoshinari, additional, Aléon, Jérôme, additional, O’D. Alexander, Conel M., additional, Amari, Sachiko, additional, Amelin, Yuri, additional, Bizzarro, Martin, additional, Bouvier, Audrey, additional, Carlson, Richard W., additional, Chaussidon, Marc, additional, Choi, Byeon-Gak, additional, Dauphas, Nicolas, additional, Davis, Andrew M., additional, Di Rocco, Tommaso, additional, Fujiya, Wataru, additional, Fukai, Ryota, additional, Gautam, Ikshu, additional, Haba, Makiko K., additional, Hibiya, Yuki, additional, Hidaka, Hiroshi, additional, Homma, Hisashi, additional, Hoppe, Peter, additional, Huss, Gary R., additional, Ichida, Kiyohiro, additional, Iizuka, Tsuyoshi, additional, Ireland, Trevor R., additional, Ishikawa, Akira, additional, Itoh, Shoichi, additional, Kita, Noriko T., additional, Kitajima, Kouki, additional, Kleine, Thorsten, additional, Komatani, Shintaro, additional, Krot, Alexander N., additional, Liu, Ming-Chang, additional, Masuda, Yuki, additional, McKeegan, Kevin D., additional, Morita, Mayu, additional, Motomura, Kazuko, additional, Moynier, Frédéric, additional, Nakai, Izumi, additional, Nguyen, Ann, additional, Nittler, Larry, additional, Onose, Morihiko, additional, Pack, Andreas, additional, Park, Changkun, additional, Qin, Liping, additional, Russell, Sara S., additional, Schönbächler, Maria, additional, Tafla, Lauren, additional, Tang, Haolan, additional, Terada, Kentaro, additional, Terada, Yasuko, additional, Usui, Tomohiro, additional, Wada, Sohei, additional, Wadhwa, Meenakshi, additional, Walker, Richard J., additional, Yamashita, Katsuyuki, additional, Yin, Qing-Zhu, additional, Yokoyama, Tetsuya, additional, Yoneda, Shigekazu, additional, Young, Edward D., additional, Yui, Hiroharu, additional, Zhang, Ai-Cheng, additional, Nakamura, Tomoki, additional, Naraoka, Hiroshi, additional, Okazaki, Ryuji, additional, Sakamoto, Kanako, additional, Yabuta, Hikaru, additional, Abe, Masanao, additional, Miyazaki, Akiko, additional, Nakato, Aiko, additional, Nishimura, Masahiro, additional, Okada, Tatsuaki, additional, Yada, Toru, additional, Yogata, Kasumi, additional, Nakazawa, Satoru, additional, Saiki, Takanao, additional, Tanaka, Satoshi, additional, Terui, Fuyuto, additional, Tsuda, Yuichi, additional, Watanabe, Sei-ichiro, additional, Yoshikawa, Makoto, additional, Tachibana, Shogo, additional, and Yurimoto, Hisayoshi, additional

Published
2023
Full Text
View/download PDF

49. Carbonate record of temporal change in oxygen fugacity and gaseous species in asteroid Ryugu

Author

Fujiya, Wataru, Kawasaki, Noriyuki, Nagashima, Kazuhide, Sakamoto, Naoya, O'D. Alexander, Conel M., Kita, Noriko T., Kitajima, Kouki, Abe, Yoshinari, Aleon, Jerome, Amari, Sachiko, Amelin, Yuri, Bajo, Ken-ichi, Bizzarro, Martin, Bouvier, Audrey, Carlson, Richard W., Chaussidon, Marc, Choi, Byeon-Gak, Dauphas, Nicolas, Davis, Andrew M., Di Rocco, Tommaso, Fukai, Ryota, Gautam, Ikshu, Haba, Makiko K., Hibiya, Yuki, Hidaka, Hiroshi, Homma, Hisashi, Hoppe, Peter, Huss, Gary R., Ichida, Kiyohiro, Iizuka, Tsuyoshi, Ireland, Trevor R., Ishikawa, Akira, Itoh, Shoichi, Kleine, Thorsten, Komatani, Shintaro, Krot, Alexander N., Liu, Ming-Chang, Masuda, Yuki, McKeegan, Kevin D., Morita, Mayu, Motomura, Kazuko, Moynier, Frederic, Nakai, Izumi, Nguyen, Ann, Nittler, Larry, Onose, Morihiko, Pack, Andreas, Park, Changkun, Piani, Laurette, Qin, Liping, Russell, Sara S., Schonbachler, Maria, Tafla, Lauren, Tang, Haolan, Terada, Kentaro, Terada, Yasuko, Usui, Tomohiro, Wada, Sohei, Wadhwa, Meenakshi, Walker, Richard J., Yamashita, Katsuyuki, Yin, Qing-Zhu, Yokoyama, Tetsuya, Yoneda, Shigekazu, Young, Edward D., Yui, Hiroharu, Zhang, Ai-Cheng, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Sakamoto, Kanako, Yabuta, Hikaru, Abe, Masanao, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Okada, Tatsuaki, Yada, Toru, Yogata, Kasumi, Nakazawa, Satoru, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Tsuda, Yuichi, Watanabe, Sei-ichiro, Yoshikawa, Makoto, Tachibana, Shogo, Yurimoto, Hisayoshi, Fujiya, Wataru, Kawasaki, Noriyuki, Nagashima, Kazuhide, Sakamoto, Naoya, O'D. Alexander, Conel M., Kita, Noriko T., Kitajima, Kouki, Abe, Yoshinari, Aleon, Jerome, Amari, Sachiko, Amelin, Yuri, Bajo, Ken-ichi, Bizzarro, Martin, Bouvier, Audrey, Carlson, Richard W., Chaussidon, Marc, Choi, Byeon-Gak, Dauphas, Nicolas, Davis, Andrew M., Di Rocco, Tommaso, Fukai, Ryota, Gautam, Ikshu, Haba, Makiko K., Hibiya, Yuki, Hidaka, Hiroshi, Homma, Hisashi, Hoppe, Peter, Huss, Gary R., Ichida, Kiyohiro, Iizuka, Tsuyoshi, Ireland, Trevor R., Ishikawa, Akira, Itoh, Shoichi, Kleine, Thorsten, Komatani, Shintaro, Krot, Alexander N., Liu, Ming-Chang, Masuda, Yuki, McKeegan, Kevin D., Morita, Mayu, Motomura, Kazuko, Moynier, Frederic, Nakai, Izumi, Nguyen, Ann, Nittler, Larry, Onose, Morihiko, Pack, Andreas, Park, Changkun, Piani, Laurette, Qin, Liping, Russell, Sara S., Schonbachler, Maria, Tafla, Lauren, Tang, Haolan, Terada, Kentaro, Terada, Yasuko, Usui, Tomohiro, Wada, Sohei, Wadhwa, Meenakshi, Walker, Richard J., Yamashita, Katsuyuki, Yin, Qing-Zhu, Yokoyama, Tetsuya, Yoneda, Shigekazu, Young, Edward D., Yui, Hiroharu, Zhang, Ai-Cheng, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Sakamoto, Kanako, Yabuta, Hikaru, Abe, Masanao, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Okada, Tatsuaki, Yada, Toru, Yogata, Kasumi, Nakazawa, Satoru, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Tsuda, Yuichi, Watanabe, Sei-ichiro, Yoshikawa, Makoto, Tachibana, Shogo, and Yurimoto, Hisayoshi

Abstract

The Hayabusa2 spacecraft explored asteroid Ryugu and brought its surface materials to Earth. Ryugu samples resemble Ivuna-type (CI) chondrites-the most chemically primitive meteorites-and contain secondary phyllosilicates and carbonates, which are indicative of aqueous alteration. Understanding the conditions (such as temperature, redox state and fluid composition) during aqueous alteration is crucial to elucidating how Ryugu evolved to its present state, but little is known about the temporal changes in these conditions. Here we show that calcium carbonate (calcite) grains in Ryugu and Ivuna samples have variable O-18/O-16 and C-13/C-12 ratios that are, respectively, 24-46 & PTSTHOUSND; and 65-108 & PTSTHOUSND; greater than terrestrial standard values, whereas those of calcium-magnesium carbonate (dolomite) grains are much more homogeneous, ranging within 31-36 & PTSTHOUSND; for oxygen and 67-75 & PTSTHOUSND; for carbon. We infer that the calcite precipitated first over a wide range of temperatures and oxygen partial pressures, and that the proportion of gaseous CO2/CO/CH4 molecules changed temporally. By contrast, the dolomite formed later in a more oxygen-rich and thus CO2-dominated environment when the system was approaching equilibrium. The characteristic isotopic compositions of secondary carbonates in Ryugu and Ivuna are not observed for other hydrous meteorites, suggesting a unique evolutionary pathway for their parent asteroid(s). The asteroid Ryugu experienced aqueous alteration under changing temperature and redox conditions, according to an isotopic analysis of secondary calcite and dolomite grains in samples from Ryugu obtained by the Hayabusa2 spacecraft.

Published
2023

50. The Oxygen Isotopic Composition of Samples Returned from Asteroid Ryugu with Implications for the Nature of the Parent Planetesimal

Author

Tang, Haolan, Young, Edward D., Tafla, Lauren, Pack, Andreas, Di Rocco, Tommaso, Abe, Yoshinari, Aléon, Jérôme, Alexander, Conel M. O'D., Amari, Sachiko, Amelin, Yuri, Bajo, Ken-ichi, Bizzarro, Martin, Bouvier, Audrey, Carlson, Richard W., Chaussidon, Marc, Choi, Byeon-Gak, Dauphas, Nicolas, Davis, Andrew M., Fujiya, Wataru, Fukai, Ryota, Gautam, Ikshu, Haba, Makiko K., Hibiya, Yuki, Hidaka, Hiroshi, Homma, Hisashi, Hoppe, Peter, Huss, Gary R., Ichida, Kiyohiro, Iizuka, Tsuyoshi, Ireland, Trevor R., Ishikawa, Akira, Ito, Motoo, Itoh, Shoichi, Kawasaki, Noriyuki, Kita, Noriko T., Kitajima, Kouki, Kleine, Thorsten, Komatani, Shintaro, Krot, Alexander N., Liu, Ming-Chang, Masuda, Yuki, McKeegan, Kevin D., Morita, Mayu, Motomura, Kazuko, Moynier, Frédéric, Nagashima, Kazuhide, Nakai, Izumi, Nguyen, Ann, Nittler, Larry, Onose, Morihiko, Park, Changkun, Piani, Laurette, Qin, Liping, Russell, Sara S., Sakamoto, Naoya, Schönbächler, Maria, Terada, Kentaro, Terada, Yasuko, Usui, Tomohiro, Wada, Sohei, Wadhwa, Meenakshi, Walker, Richard J., Yamashita, Katsuyuki, Yin, Qing-Zhu, Yokoyama, Tetsuya, Yoneda, Shigekazu, Yui, Hiroharu, Zhang, Ai-Cheng, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Sakamoto, Kanako, Yabuta, Hikaru, Abe, Masanao, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Okada, Tatsuaki, Yada, Toru, Yogata, Kasumi, Nakazawa, Satoru, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Tsuda, Yuichi, Watanabe, Sei-ichiro, Yoshikawa, Makoto, Tachibana, Shogo, Yurimoto, Hisayoshi, Tang, Haolan, Young, Edward D., Tafla, Lauren, Pack, Andreas, Di Rocco, Tommaso, Abe, Yoshinari, Aléon, Jérôme, Alexander, Conel M. O'D., Amari, Sachiko, Amelin, Yuri, Bajo, Ken-ichi, Bizzarro, Martin, Bouvier, Audrey, Carlson, Richard W., Chaussidon, Marc, Choi, Byeon-Gak, Dauphas, Nicolas, Davis, Andrew M., Fujiya, Wataru, Fukai, Ryota, Gautam, Ikshu, Haba, Makiko K., Hibiya, Yuki, Hidaka, Hiroshi, Homma, Hisashi, Hoppe, Peter, Huss, Gary R., Ichida, Kiyohiro, Iizuka, Tsuyoshi, Ireland, Trevor R., Ishikawa, Akira, Ito, Motoo, Itoh, Shoichi, Kawasaki, Noriyuki, Kita, Noriko T., Kitajima, Kouki, Kleine, Thorsten, Komatani, Shintaro, Krot, Alexander N., Liu, Ming-Chang, Masuda, Yuki, McKeegan, Kevin D., Morita, Mayu, Motomura, Kazuko, Moynier, Frédéric, Nagashima, Kazuhide, Nakai, Izumi, Nguyen, Ann, Nittler, Larry, Onose, Morihiko, Park, Changkun, Piani, Laurette, Qin, Liping, Russell, Sara S., Sakamoto, Naoya, Schönbächler, Maria, Terada, Kentaro, Terada, Yasuko, Usui, Tomohiro, Wada, Sohei, Wadhwa, Meenakshi, Walker, Richard J., Yamashita, Katsuyuki, Yin, Qing-Zhu, Yokoyama, Tetsuya, Yoneda, Shigekazu, Yui, Hiroharu, Zhang, Ai-Cheng, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Sakamoto, Kanako, Yabuta, Hikaru, Abe, Masanao, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Okada, Tatsuaki, Yada, Toru, Yogata, Kasumi, Nakazawa, Satoru, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Tsuda, Yuichi, Watanabe, Sei-ichiro, Yoshikawa, Makoto, Tachibana, Shogo, and Yurimoto, Hisayoshi

Abstract

We present oxygen isotopic analyses of fragments of the near-Earth Cb-type asteroid Ryugu returned by the Hayabusa2 spacecraft that reinforce the close correspondence between Ryugu and CI chondrites. Small differences between Ryugu samples and CI chondrites in can be explained at least in part by contamination of the latter by terrestrial water. The discovery that a randomly sampled C-complex asteroid is composed of CI-chondrite-like rock, combined with thermal models for formation prior to significant decay of the short-lived radioisotope 26Al, suggests that if lithified at the time of alteration, the parent body was small (≪50 km radius). If the parent planetesimal was large (>50 km in radius), it was likely composed of high-permeability, poorly lithified sediment rather than consolidated rock., We present oxygen isotopic analyses of fragments of the near-Earth Cb-type asteroid Ryugu returned by the Hayabusa2 spacecraft that reinforce the close correspondence between Ryugu and CI chondrites. Small differences between Ryugu samples and CI chondrites in can be explained at least in part by contamination of the latter by terrestrial water. The discovery that a randomly sampled C-complex asteroid is composed of CI-chondrite-like rock, combined with thermal models for formation prior to significant decay of the short-lived radioisotope 26Al, suggests that if lithified at the time of alteration, the parent body was small (≪50 km radius). If the parent planetesimal was large (>50 km in radius), it was likely composed of high-permeability, poorly lithified sediment rather than consolidated rock.

Published
2023

Catalog

Books, media, physical & digital resources
See catalog results