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1. Unique achondrite Northwest Africa 11042: Exploring the melting and breakup of the L Chondrite parent body

Author

Vaci, Zoltan, Agee, Carl B., Humayun, Munir, Ziegler, Karen, Asmerom, Yemane, Polyak, Victor, Busemann, Henner, Krietsch, Daniela, Heizler, Matthew, Sanborn, Matthew E., and Yin, Qing-Zhu

Subjects
Astrophysics - Earth and Planetary Astrophysics, Physics - Geophysics
Abstract

Northwest Africa (NWA) 11042 is a heavily shocked achondrite with medium-grained cumulate textures. Its olivine and pyroxene compositions, oxygen isotopic composition, and chromium isotopic composition are consistent with L chondrites. Sm-Nd dating of its primary phases shows a crystallization age of 4100 +/- 160 Ma. Ar-Ar dating of its shocked mineral maskelynite reveals an age of 484.0 +/- 1.5 Ma. This age coincides roughly with the breakup event of the L chondrite parent body evident in the shock ages of many L chondrites and the terrestrial record of fossil L chondritic chromite. NWA 11042 shows large depletions in siderophile elements (<0.01 times CI) suggestive of a complex igneous history involving extraction of a Fe-Ni-S liquid on the L chondrite parent body. Due to its relatively young crystallization age, the heat source for such an igneous process is most likely impact. Because its mineralogy, petrology, and O isotopes are similar to the ungrouped achondrite NWA 4284 (this work), the two meteorites are likely paired and derived from the same parent body.

Published
2021

2. The anomalous polymict ordinary chondrite breccia of Elmshorn (H3‐6)—Late reaccretion after collision between two ordinary chondrite parent bodies, complete disruption, and mixing possibly about 2.8 Gyr ago

Author

Bischoff, Addi, primary, Patzek, Markus, additional, Alosius, Romain M. L., additional, Barrat, Jean‐Alix, additional, Berndt, Jasper, additional, Busemann, Henner, additional, Degering, Detlev, additional, Di Rocco, Tommaso, additional, Ek, Mattias, additional, Gattacceca, Jérôme, additional, Godinho, Jose R. A., additional, Heinlein, Dieter, additional, Krietsch, Daniela, additional, Maden, Colin, additional, Marchhart, Oscar, additional, Martschini, Martin, additional, Merchel, Silke, additional, Pack, Andreas, additional, Peters, Stefan, additional, Rüfenacht, Miriam, additional, Schlüter, Jochen, additional, Schönbächler, Maria, additional, Stojic, Aleksandra, additional, Storz, Jakob, additional, Tillmann, Wolfgang, additional, Wieser, Alexander, additional, Wimmer, Karl, additional, and Zielke, Reiner, additional

Published
2024
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4. Noble gases and nitrogen in samples of asteroid Ryugu record its volatile sources and recent surface evolution

Author

Okazaki, Ryuji, primary, Marty, Bernard, additional, Busemann, Henner, additional, Hashizume, Ko, additional, Gilmour, Jamie D., additional, Meshik, Alex, additional, Yada, Toru, additional, Kitajima, Fumio, additional, Broadley, Michael W., additional, Byrne, David, additional, Füri, Evelyn, additional, Riebe, My E. I., additional, Krietsch, Daniela, additional, Maden, Colin, additional, Ishida, Akizumi, additional, Clay, Patricia, additional, Crowther, Sarah A., additional, Fawcett, Lydia, additional, Lawton, Thomas, additional, Pravdivtseva, Olga, additional, Miura, Yayoi N., additional, Park, Jisun, additional, Bajo, Ken-ichi, additional, Takano, Yoshinori, additional, Yamada, Keita, additional, Kawagucci, Shinsuke, additional, Matsui, Yohei, additional, Yamamoto, Mizuki, additional, Righter, Kevin, additional, Sakai, Saburo, additional, Iwata, Naoyoshi, additional, Shirai, Naoki, additional, Sekimoto, Shun, additional, Inagaki, Makoto, additional, Ebihara, Mitsuru, additional, Yokochi, Reika, additional, Nishiizumi, Kunihiko, additional, Nagao, Keisuke, additional, Lee, Jong Ik, additional, Kano, Akihiro, additional, Caffee, Marc W., additional, Uemura, Ryu, additional, Nakamura, Tomoki, additional, Naraoka, Hiroshi, additional, Noguchi, Takaaki, additional, Yabuta, Hikaru, additional, Yurimoto, Hisayoshi, additional, Tachibana, Shogo, additional, Sawada, Hirotaka, additional, Sakamoto, Kanako, additional, Abe, Masanao, additional, Arakawa, Masahiko, additional, Fujii, Atsushi, additional, Hayakawa, Masahiko, additional, Hirata, Naoyuki, additional, Hirata, Naru, additional, Honda, Rie, additional, Honda, Chikatoshi, additional, Hosoda, Satoshi, additional, Iijima, Yu-ichi, additional, Ikeda, Hitoshi, additional, Ishiguro, Masateru, additional, Ishihara, Yoshiaki, additional, Iwata, Takahiro, additional, Kawahara, Kosuke, additional, Kikuchi, Shota, additional, Kitazato, Kohei, additional, Matsumoto, Koji, additional, Matsuoka, Moe, additional, Michikami, Tatsuhiro, additional, Mimasu, Yuya, additional, Miura, Akira, additional, Morota, Tomokatsu, additional, Nakazawa, Satoru, additional, Namiki, Noriyuki, additional, Noda, Hirotomo, additional, Noguchi, Rina, additional, Ogawa, Naoko, additional, Ogawa, Kazunori, additional, Okada, Tatsuaki, additional, Okamoto, Chisato, additional, Ono, Go, additional, Ozaki, Masanobu, additional, Saiki, Takanao, additional, Sakatani, Naoya, additional, Senshu, Hiroki, additional, Shimaki, Yuri, additional, Shirai, Kei, additional, Sugita, Seiji, additional, Takei, Yuto, additional, Takeuchi, Hiroshi, additional, Tanaka, Satoshi, additional, Tatsumi, Eri, additional, Terui, Fuyuto, additional, Tsukizaki, Ryudo, additional, Wada, Koji, additional, Yamada, Manabu, additional, Yamada, Tetsuya, additional, Yamamoto, Yukio, additional, Yano, Hajime, additional, Yokota, Yasuhiro, additional, Yoshihara, Keisuke, additional, Yoshikawa, Makoto, additional, Yoshikawa, Kent, additional, Furuya, Shizuho, additional, Hatakeda, Kentaro, additional, Hayashi, Tasuku, additional, Hitomi, Yuya, additional, Kumagai, Kazuya, additional, Miyazaki, Akiko, additional, Nakato, Aiko, additional, Nishimura, Masahiro, additional, Soejima, Hiromichi, additional, Iwamae, Ayako, additional, Yamamoto, Daiki, additional, Yogata, Kasumi, additional, Yoshitake, Miwa, additional, Fukai, Ryota, additional, Usui, Tomohiro, additional, Connolly, Harold C., additional, Lauretta, Dante, additional, Watanabe, Sei-ichiro, additional, and Tsuda, Yuichi, additional

Published
2023
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5. First asteroid gas sample delivered by the Hayabusa2 mission: A treasure box from Ryugu

Author

Okazaki, Ryuji, primary, Miura, Yayoi N., additional, Takano, Yoshinori, additional, Sawada, Hirotaka, additional, Sakamoto, Kanako, additional, Yada, Toru, additional, Yamada, Keita, additional, Kawagucci, Shinsuke, additional, Matsui, Yohei, additional, Hashizume, Ko, additional, Ishida, Akizumi, additional, Broadley, Michael W., additional, Marty, Bernard, additional, Byrne, David, additional, Füri, Evelyn, additional, Meshik, Alex, additional, Pravdivtseva, Olga, additional, Busemann, Henner, additional, Riebe, My E.I., additional, Gilmour, Jamie, additional, Park, Jisun, additional, Bajo, Ken-ichi, additional, Righter, Kevin, additional, Sakai, Saburo, additional, Sekimoto, Shun, additional, Kitajima, Fumio, additional, Crowther, Sarah A., additional, Iwata, Naoyoshi, additional, Shirai, Naoki, additional, Ebihara, Mitsuru, additional, Yokochi, Reika, additional, Nishiizumi, Kunihiko, additional, Nagao, Keisuke, additional, Lee, Jong Ik, additional, Clay, Patricia, additional, Kano, Akihiro, additional, Caffee, Marc W., additional, Uemura, Ryu, additional, Inagaki, Makoto, additional, Krietsch, Daniela, additional, Maden, Colin, additional, Yamamoto, Mizuki, additional, Fawcett, Lydia, additional, Lawton, Thomas, additional, Nakamura, Tomoki, additional, Naraoka, Hiroshi, additional, Noguchi, Takaaki, additional, Yabuta, Hikaru, additional, Yurimoto, Hisayoshi, additional, Tsuda, Yuichi, additional, Watanabe, Sei-ichiro, additional, Abe, Masanao, additional, Arakawa, Masahiko, additional, Fujii, Atsushi, additional, Hayakawa, Masahiko, additional, Hirata, Naoyuki, additional, Hirata, Naru, additional, Honda, Rie, additional, Honda, Chikatoshi, additional, Hosoda, Satoshi, additional, Iijima, Yu-ichi, additional, Ikeda, Hitoshi, additional, Ishiguro, Masateru, additional, Ishihara, Yoshiaki, additional, Iwata, Takahiro, additional, Kawahara, Kosuke, additional, Kikuchi, Shota, additional, Kitazato, Kohei, additional, Matsumoto, Koji, additional, Matsuoka, Moe, additional, Michikami, Tatsuhiro, additional, Mimasu, Yuya, additional, Miura, Akira, additional, Morota, Tomokatsu, additional, Nakazawa, Satoru, additional, Namiki, Noriyuki, additional, Noda, Hirotomo, additional, Noguchi, Rina, additional, Ogawa, Naoko, additional, Ogawa, Kazunori, additional, Okada, Tatsuaki, additional, Okamoto, Chisato, additional, Ono, Go, additional, Ozaki, Masanobu, additional, Saiki, Takanao, additional, Sakatani, Naoya, additional, Senshu, Hiroki, additional, Shimaki, Yuri, additional, Shirai, Kei, additional, Sugita, Seiji, additional, Takei, Yuto, additional, Takeuchi, Hiroshi, additional, Tanaka, Satoshi, additional, Tatsumi, Eri, additional, Terui, Fuyuto, additional, Tsukizaki, Ryudo, additional, Wada, Koji, additional, Yamada, Manabu, additional, Yamada, Tetsuya, additional, Yamamoto, Yukio, additional, Yano, Hajime, additional, Yokota, Yasuhiro, additional, Yoshihara, Keisuke, additional, Yoshikawa, Makoto, additional, Yoshikawa, Kent, additional, Furuya, Shizuho, additional, Hatakeda, Kentaro, additional, Hayashi, Tasuku, additional, Hitomi, Yuya, additional, Kumagai, Kazuya, additional, Miyazaki, Akiko, additional, Nakato, Aiko, additional, Nishimura, Masahiro, additional, Soejima, Hiromichi, additional, Iwamae, Ayako, additional, Yamamoto, Daiki, additional, Yogata, Kasumi, additional, Yoshitake, Miwa, additional, Fukai, Ryota, additional, Usui, Tomohiro, additional, Ireland, Trevor, additional, Connolly, Harold C., additional, Lauretta, Dante S., additional, and Tachibana, Shogo, additional

Published
2022
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8. Cosmic pears from the Havelland (Germany): Ribbeck, the twelfth recorded aubrite fall in history.

Author

Bischoff, Addi, Patzek, Markus, Barrat, Jean‐Alix, Berndt, Jasper, Busemann, Henner, Degering, Detlev, Di Rocco, Tommaso, Ek, Mattias, Harries, Dennis, Godinho, Jose R. A., Heinlein, Dieter, Kriele, Armin, Krietsch, Daniela, Maden, Colin, Marchhart, Oscar, Marshal, Rachael M., Martschini, Martin, Merchel, Silke, Möller, Andreas, and Pack, Andreas

Subjects
*SMALL solar system bodies, *PEARS, *METAL sulfides, *ATMOSPHERE, *COSMIC rays, *ASTEROIDS
Abstract

In 1889 the German poet and novelist Theodor Fontane wrote the popular literary ballad “Herr von Ribbeck auf Ribbeck im Havelland.” The Squire von Ribbeck is described as a gentle and generous person, who often gives away pears from his pear trees to children passing by and continued donating pears after his death. Now, 135 years later the rock called Ribbeck is giving us insight into processes that happened 4.5 billion years ago. The meteorite Ribbeck (official find location: 52°37′15″N, 12°45′40″E) fell January 21, 2024, and has been classified as a brecciated aubrite. This meteoroid actually entered the Earth's atmosphere at 00:32:38 UTC over Brandenburg, west of Berlin, and the corresponding fireball was recorded by professional all sky and video cameras. More than 200 pieces (two proved by radionuclide analysis to belong to this fresh fall) were recovered totaling about 1.8 kg. Long‐lived radionuclide and noble gas data are consistent with long cosmic ray exposure (55–62 Ma) and a preatmospheric radius of Ribbeck between 20 and 30 cm. The heavily brecciated aubrite consists of major (76 ± 3 vol%) coarse‐grained FeO‐free enstatite (En99.1Fs<0.04Wo0.9), with a significant abundance (15.0 ± 2.5 vol%) of albitic plagioclase (Ab95.3 An2.0Or2.7), minor forsterite (5.5 ± 1.5 vol%; Fo99.9) and 3.5 ± 1.0 vol% of opaque phases (mainly sulfides and metals) with traces of nearly FeO‐free diopside (En53.2Wo46.8) and K‐feldspar (Ab4.6Or95.4). The rock has a shock degree of S3 (U‐S3), and terrestrial weathering has affected metals and sulfides, resulting in the brownish appearance of rock pieces and the partial destruction of certain sulfides already within days after the fall. The bulk chemical data confirm the feldspar‐bearing aubritic composition. Ribbeck is closely related to the aubrite Bishopville. Ribbeck does not contain solar wind implanted gases and is a fragmental breccia. Concerning the Ti‐ and O‐isotope compositions, the data are similar to those of other aubrites. They are also similar to E chondrites and fall close to the data point for the bulk silicate Earth (BSE). Before the Ribbeck meteoroid entered Earth's atmosphere, it was observed in space as asteroid 2024 BX1. The aphelion distance of 2024 BX1's orbit lies in the innermost region of the asteroid belt, which is populated by the Hungaria family of minor planets characterized by their E/X‐type taxonomy and considered as the likely source of aubrites. The spectral comparison of an average large‐scale emission spectrum of Mercury converted into reflectance and of the Ribbeck meteorite spectrum does not show any meaningful similarities. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Noble gases in CM carbonaceous chondrites: Effect of parent body aqueous and thermal alteration and cosmic ray exposure ages

Author

Krietsch, Daniela, Busemann, Henner, Riebe, My, King, Ashley J., Alexander, Conel M.O’D., and Maden, Colin

Subjects
13. Climate action, CM chondrites, Aqueous alteration, Thermal alteration, Carbonaceous chondrites, Noble gases, Cosmic ray exposure ages
Abstract

Like most primitive carbonaceous chondrites, the CM chondrites experienced varying degrees of asteroidal aqueous alteration, which may have overprinted pre-accretionary processing. Several aqueous alteration scales for CM chondrites (and other carbonaceous chondrites) have been proposed based on alteration-dependent changes in various petrological and geochemical characteristics. Given the possibility that the intensity of aqueous alteration could be recorded in the primordial noble gas compositions, we test potential correlations between petrologic, geochemical and noble gas characteristics in a detailed study on 39 CM chondrites, including some of the most pristine CM chondrites identified to date, and 4 CM-related carbonaceous chondrites. We mainly compare our noble gas data with the alteration schemes proposed by Alexander et al. (2013) and Howard et al. (2015). In addition to the noble gas analyses, we determined the phyllosilicate fractions of 17 of the CM chondrites using X-ray diffraction (XRD) to complement missing data points in the Howard alteration scheme. The influence of post-hydration thermal modification on noble gases in CM chondrites is investigated by comparison of heated and unheated samples. Cosmic-ray exposure (CRE) ages are determined for all samples in this study as well as for 26 more samples based on CM chondrite literature noble gas data. The noble gas inventory in CM chondrites represents a mixture of cosmogenic, radiogenic, and abundant primordially trapped noble gases. Additionally, about 50 % of our CM bulk samples contain detectable solar wind (SW), which implies that many but not all CM chondrites are regolith breccias or carry SW from a pre-accretion irradiation phase. Aqueous alteration affects primordial noble gas abundances and elemental and isotopic compositions in CM chondrites. In particular, the process causes loss of an Ar-rich component, different in elemental and isotopic composition to known noble gas components. This component is lost during the early stages of aqueous alteration until complete degassing of its carrier material (possibly upon at least partial destruction) below petrologic type of ~1.5 on the Howard et al. (2015) scale. Likely, small amounts of Q gases were additionally released by aqueous alteration. Strong thermal modification at >750 °C results in a significant additional loss of noble gases, whereas peak temperatures, Geochimica et Cosmochimica Acta, 310, ISSN:0016-7037, ISSN:1872-9533

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