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7. A reference time scale for Site U1385 (Shackleton Site) on the SW Iberian Margin

Author

Abrantes, Fatima, Acton, Gary D., Alvarez Zarikian, Carlos A., Bahr, André, Balestra, Barbara, Barranco, Estefanìa Llave, Carrara, Gabriela, Ducassou, Emmanuelle, Flood, Roger D., Flores, José-Abel, Furota, Satoshi, Grimalt, Joan, Grunert, Patrick, Hernández-Molina, Javier, Kim, Jin Kyoung, Krissek, Lawrence A., Kuroda, Junichiro, Li, Baohua, Lofi, Johanna, Margari, Vasiliki, Martrat, Belen, Miller, Madeline D., Nanayama, Futoshi, Nishida, Naohisa, Richter, Carl, Rodrigues, Teresa, Rodríguez-Tovar, Francisco J., Roque, Ana Cristina Freixo, Sanchez Goñi, Maria F., Sierro Sánchez, Francisco J., Singh, Arun D., Sloss, Craig R., Stow, Dorrik A.V., Takashimizu, Yasuhiro, Tzanova, Alexandrina, Voelker, Antje, Xuan, Chuang, Williams, Trevor, Hodell, D., Lourens, L., Crowhurst, S., Konijnendijk, T., Tjallingii, R., Jiménez-Espejo, F., Skinner, L., and Tzedakis, P.C.

Published
2015
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8. Onset of Mediterranean outflow into the North Atlantic

Author

Hernández-Molina, F. Javier, Stow, Dorrik A. V., Alvarez-Zarikian, Carlos A., Acton, Gary, Bahr, André, Balestra, Barbara, Ducassou, Emmanuelle, Flood, Roger, Flores, José-Abel, Furota, Satoshi, Grunert, Patrick, Hodell, David, Jimenez-Espejo, Francisco, Kim, Jin Kyoung, Krissek, Lawrence, Kuroda, Junichiro, Li, Baohua, Llave, Estefania, Lofi, Johanna, Lourens, Lucas, Miller, Madeline, Nanayama, Futoshi, Nishida, Naohisa, Richter, Carl, Roque, Cristina, Pereira, Hélder, Goñi, Maria Fernanda Sanchez, Sierro, Francisco J., Singh, Arun Deo, Sloss, Craig, Takashimizu, Yasuhiro, Tzanova, Alexandrina, Voelker, Antje, Williams, Trevor, and Xuan, Chuang

Published
2014

10. Downslope variation in hemipelagic sedimentation in an active margin basin: An example from the lower Pleistocene Kiwada and Takamizo formations on the Boso Peninsula, Japan.

Author

Kurosawa, Shiho, Furota, Satoshi, Mitsui, Mayu, Sawada, Ken, Seike, Koji, Furukawa, Noboru, and Ito, Makoto

Subjects
*SEDIMENTATION & deposition, *TURBIDITY currents, *PLEISTOCENE Epoch, *MAGNETIC susceptibility, *PENINSULAS, *SUBMARINE fans
Abstract

Hemipelagites are widespread fine‐grained sediments found from shelf margin to deep‐water environments, and they are considered to have been formed as background sedimentation by vertical settling and slow lateral advection of clastic and biogenic fine‐grained particles. Downflow variation in hemipelagic sedimentation, however, is not yet clearly understood, and was investigated in the lower Pleistocene Kiwada and Takamizo formations in the Kazusa forearc basin on the Boso Peninsula, Japan. Mapping of three tephra key beds enabled detailed correlation of two hemipelagite beds over a distance of ca 30 km from shelf‐margin to basin‐plain environments. The sedimentation rates decreased gradually in the downslope direction, but increased locally in response to turbidite sedimentation. This downslope variation indicates that hemipelagic sedimentation is not necessarily constant and varies in response to progradation and retrogradation of deep‐water depositional systems, as well as additional input of fine‐grained sediments from turbidity currents. In contrast, the grain size, magnetic susceptibility, clay‐mineral composition, total organic carbon contents relative to total nitrogen contents (carbon/nitrogen), and δ13C values of organic carbon do not exhibit distinct downslope variation. This downslope consistency indicates that hemipelagites document temporal perturbations of geological and palaeoclimatic conditions in hinterlands, regardless of spatial and temporal variations in deep‐water depositional environments. The concentrations of total organic carbon, total nitrogen and five biomarkers were lower values in turbiditic mudstones and hemipelagites that formed above a turbidite bed than in those of the other hemipelagites. This variation suggests that an additional supply of fine‐grained sediments from turbidity currents likely diluted the organic matter in the hemipelagites. In addition, hemipelagites for which deposition was affected by turbidity currents exhibit slightly lower δ13C values, and may also document an additional contribution of terrestrial organic matter from turbidity currents. [ABSTRACT FROM AUTHOR]

Published
2023
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11. PALEOCEANOGRAPHY: Onset of Mediterranean outflow into the North Atlantic

Author

Hernández-Molina, Javier F., Stow, Dorrik A. V., Alvarez-Zarikian, Carlos A., Acton, Gary, Bahr, André, Balestra, Barbara, Ducassou, Emmanuelle, Flood, Roger, Flores, José-Abel, Furota, Satoshi, Grunert, Patrick, Hodell, David, Jimenez-Espejo, Francisco, Kim, Jin Kyoung, Krissek, Lawrence, Kuroda, Junichiro, Li, Baohua, Llave, Estefania, Lofi, Johanna, Lourens, Lucas, Miller, Madeline, Nanayama, Futoshi, Nishida, Naohisa, Richter, Carl, Roque, Cristina, Pereira, Hélder, Goñi, Maria Fernanda Sanchez, Sierro, Francisco J., Singh, Arun Deo, Sloss, Craig, Takashimizu, Yasuhiro, Tzanova, Alexandrina, Voelker, Antje, Williams, Trevor, and Xuan, Chuang

Published
2014
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15. A reference time scale for Site U1385 (Shackleton Site) on the SW Iberian Margin

Author

Hodell, D., Lourens, L., Crowhurst, S., Konijnendijk, T., Tjallingii, R., Jiménez-Espejod, F., Skinner, L., Tzedakis, P. C., Abrantes, Fatima, Acton, Gary D., Alvarez Zarikian, Carlos A., Bahr, André, Balestra, Barbara, Barranco, Estefanìa Llave, Carrara, Gabriela, Ducassou, Emmanuelle, Flood, Roger D., Flores, José-Abel, Furota, Satoshi, Grimalt, Joan, Grunert, Patrick, Hernández-Molina, Javier, Kim, Jin Kyoung, Krissek, Lawrence A., Kuroda, Junichiro, Li, Baohua, Lofi, Johanna, Margari, Vasiliki, Martrat, Belen, Miller, Madeline D., Nanayama, Futoshi, Nishida, Naohisa, Richter, Carl, Rodrigues, Teresa, Rodríguez-Tovar, Francisco J., Roque, Ana Cristina Freixo, Sanchez Goñi, Maria F., Sierro Sánchez, Francisco J., Singh, Arun D., Sloss, Craig R., Stow, Dorrik A. V., Takashimizu, Yasuhiro, Tzanova, Alexandrina, Voelker, Antje, Xuan, Chuang, Williams, Trevor, Hodell, David [0000-0001-8537-1588], Skinner, Luke [0000-0002-5050-0244], and Apollo - University of Cambridge Repository

Subjects
Pleistocene, Global and Planetary Change, sub-01, Oxygen isotopes, Cyclostratigraphy, Iberian Margin, Stratigraphic correlation, Oceanography, Millennial climate variability, IODP
Abstract

We produced a composite depth scale and chronology for Site U1385 on the SW Iberian Margin. Using log(Ca/Ti) measured by core scanning XRF at 1-cm resolution in all holes, a composite section was constructed to 166.5 meters composite depth (mcd) that corrects for stretching and squeezing in each core. Oxygen isotopes of benthic foraminifera were correlated to a stacked δ^18O reference signal (LR04) to produce an oxygen isotope stratigraphy and age model. Variations in sediment color contain very strong precession signals at Site U1385, and the amplitude modulation of these cycles provides a powerful tool for developing an orbitally-tuned age model. We tuned the U1385 record by correlating peaks in L* to the local summer insolation maxima at 37^oN. The benthic δ^18O record of Site U1385, when placed on the tuned age model, generally agrees with other time scales within their respective chronologic uncertainties. The age model is transferred to down-core data to produce a continuous time series of log(Ca/Ti) that reflect relative changes of biogenic carbonate and detrital sediment. Biogenic carbonate increases during interglacial and interstadial climate states and decreases during glacial and stadial periods. Much of the variance in the log(Ca/Ti) is explained by a linear combination of orbital frequencies (precession, tilt and eccentricity), whereas the residual signal reflects suborbital climate variability. The strong correlation between suborbital log(Ca/Ti) variability and Greenland temperature over the last glacial cycle at Site U1385 suggests that this signal can be used as a proxy for millennial-scale climate variability over the past 1.5 Ma. Millennial climate variability, as expressed by log(Ca/Ti) at Site U1385, was a persistent feature of glacial climates over the past 1.5 Ma, including glacial periods of the early Pleistocene (‘41-kyr world’) when boundary conditions differed significantly from those of the late Pleistocene (‘100-kyr world’). Suborbital variability was suppressed during interglacial stages and enhanced during glacial periods, especially when benthic δ^18O surpassed ~ 3.3-3.5‰. Each glacial inception was marked by appearance of strong millennial variability and each deglaciation was preceded by a terminal stadial event. Suborbital variability may be a symptomatic feature of glacial climate or, alternatively, may play a more active role in the inception and/or termination of glacial cycles.

Published
2015

16. Onset, evolution and effects of the Mediterranean Outflow : an overview of IODP Expedition 339 in the Gulf of Cadiz

Author

Hernández-Molina, Francisco Javier, Stow, Dorrik A. V., Alvarez-Zarikian, Carlos, Lofi, Johanna, Ducassou, Emmanuelle, Sánchez Goñi, María Fernanda, Acton, Gary D., Bahr, André, Balestra, Barbara, Flood, Roger D., Flores, José-Abel, Furota, Satoshi, Grunert, Patrick, Hodell, David A., Jiménez Espejo, Francisco J., Kim, Jin Kyoung, Krissek, Lawrence A., Kuroda, Junichiro, Li, Baohua, LLave Barranco, Estefanía, Lourens, Lucas, Miller, Madeleine D., Nanayama, Futoshi, Nishida, Naohisa, Richter, Carl, Roque, Ana Cristina, Sierro, Francisco J., Singh, Arun D., Sloss, Craig R., Takashimizu, Yasuhiro, Tzanova, Alexandrina, Voelker, Antje H. L., Williams, Trevor, and Xuan, Chuang

Subjects
Sondagem oceânica, Golfo de Cádiz (Espanha), MOW, Oceanografia, Expedições
Published
2012

17. Integrated Ocean Drilling Program Expedition 339 Preliminary Report : Mediterranean Outflow : Environmental significance of the Mediterranean Outflow water and its global implications : 16 November 2011-16 January 2012

Author

Hernández-Molina, Francisco Javier, Stow, Dorrik A. V., Alvarez-Zarikian, Carlos, Williams, Trevor, Lofi, Johanna, Acton, Gary D., Bahr, André, Balestra, Barbara, Ducassou, Emmanuelle, Flood, Roger D., Flores, José-Abel, Furota, Satoshi, Grunert, Patrick, Hodell, David A., Jimenez Espejo, Francisco J., Kim, Jin Kyoung, Krissek, Lawrence A., Kuroda, Junichiro, Li, Baohua, Lourens, Lucas, Miller, Madeleine D., Nanayama, Futoshi, Nishida, Naohisa, Richter, Carl, Sánchez Goñi, María Fernanda, Sierro Sánchez, Francisco J., Singh, Arun D., Sloss, Craig R., Takashimizu, Yasuhiro, Tzanova, Alexandrina, Voelker, Antje H. L., and Xuan, Chuang

Subjects
Sondagem oceânica, Golfo de Cádiz (Espanha), MOW, Oceanografia
Abstract

Submitted by Paula Serrano (paula.serrano@ineti.pt) on 2013-05-14T17:12:08Z No. of bitstreams: 1 35611.pdf: 4642239 bytes, checksum: 4321a8aea0910c342b8051bc8b38f416 (MD5) Approved for entry into archive by Paula Serrano (paula.serrano@ineti.pt) on 2013-05-14T17:12:18Z (GMT) No. of bitstreams: 1 35611.pdf: 4642239 bytes, checksum: 4321a8aea0910c342b8051bc8b38f416 (MD5) Made available in DSpace on 2013-05-14T17:12:18Z (GMT). No. of bitstreams: 1 35611.pdf: 4642239 bytes, checksum: 4321a8aea0910c342b8051bc8b38f416 (MD5) Previous issue date: 2012

Published
2012

18. Mediterranean outflow: Environmental significance of the Mediterranean Outflow Water and its global implications (Integrated Ocean Drilling Program Expedition 339 Preliminary Report)

Author

Hernández-Molina, Francisco J., Stow, Dorrik A.V., Zarikian, Carlos Alvarez, Williams, Trevor, Lofi, Johanna, Acton, Gary D., Bahr, André, Balestra, Barbara, Ducassou, Emmanuelle, Flood, Roger D., Flores, José Abel, Furota, Satoshi, Grunert, Patrick, Hodell, David A., Jimenez-Espejo, Francisco J., Kim, Jin Kyoung, Krissek, Lawrence A., Kuroda, Junichiro, Li, Baohua, Lourens, Lucas, Miller, Madeline D., Nanayama, Futoshi, Nishida, Naohisa, Richter, Carl, Sanchez Goni, Maria F., Sierro Sánchez, Francisco J., Singh, Arun D., Sloss, Craig R., Takashimizu, Yasuhiro, Tzanova, Alexandrina, Voelker, Antje, Xuan, Chuang, Barranco, Estefanìa Llave, Freixo Roque, Ana Cristina, Pereira, Hélder, Banta, Grant, Barnes, Heather, Beck, John, Bennight, Christopher, Blaisdell, Timothy, Broyles, Chad, Claassen, Etienne, Cobine, Trevor, Davis, Roy, Gorgas, Thomas, Grout, Ronald, Gustafson, Ted, Hall, Hillary, Herrmann, Sandra, Hodge, Michael, Hornbacher, Dwight, Jurie Kotze, Jan, Moortgat, Erik, Peng, Chieh, Pleasant, Paul, Prinz, Steve, Rotella, Melissa, Swain, Kerry, Vasilyeva, Yulia, Hernández-Molina, Francisco J., Stow, Dorrik A.V., Zarikian, Carlos Alvarez, Williams, Trevor, Lofi, Johanna, Acton, Gary D., Bahr, André, Balestra, Barbara, Ducassou, Emmanuelle, Flood, Roger D., Flores, José Abel, Furota, Satoshi, Grunert, Patrick, Hodell, David A., Jimenez-Espejo, Francisco J., Kim, Jin Kyoung, Krissek, Lawrence A., Kuroda, Junichiro, Li, Baohua, Lourens, Lucas, Miller, Madeline D., Nanayama, Futoshi, Nishida, Naohisa, Richter, Carl, Sanchez Goni, Maria F., Sierro Sánchez, Francisco J., Singh, Arun D., Sloss, Craig R., Takashimizu, Yasuhiro, Tzanova, Alexandrina, Voelker, Antje, Xuan, Chuang, Barranco, Estefanìa Llave, Freixo Roque, Ana Cristina, Pereira, Hélder, Banta, Grant, Barnes, Heather, Beck, John, Bennight, Christopher, Blaisdell, Timothy, Broyles, Chad, Claassen, Etienne, Cobine, Trevor, Davis, Roy, Gorgas, Thomas, Grout, Ronald, Gustafson, Ted, Hall, Hillary, Herrmann, Sandra, Hodge, Michael, Hornbacher, Dwight, Jurie Kotze, Jan, Moortgat, Erik, Peng, Chieh, Pleasant, Paul, Prinz, Steve, Rotella, Melissa, Swain, Kerry, and Vasilyeva, Yulia

Abstract

During Integrated Ocean Drilling Program Expedition 339, five sites were drilled in the Gulf of Cadiz and two sites were drilled off the West Iberian margin from November 2011 to January 2012. Total length of recovered core is 5447 m, with an average recovery of 86.4%. The Gulf of Cadiz was targeted for drilling as a key location for the investigation of Mediterranean Outflow Water (MOW) through the Strait of Gibraltar gateway and its influence on global circulation and climate. The gulf is also a prime area for understanding the effects of tectonic activity on evolution of the Strait of Gibraltar gateway and margin sedimentation.

Published
2012

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