New magnetostratigraphic insights from Iceberg Alley on the rhythms of Antarctic climate during the Plio‐Pleistocene
International Ocean Discovery Program (IODP) Expedition 382 in the Scotia Sea’s Iceberg Alley recovered among the most continuous and highest resolution stratigraphic records in the Southern Ocean near Antarctica spanning the last 3.3 Myr. Sites drilled in Dove Basin (U1536/U1537) have well‐resolved...
Published in: | Paleoceanography and Paleoclimatology |
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American Geophysical Union (AGU)
2021
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Online Access: | https://archimer.ifremer.fr/doc/00678/79035/81470.pdf https://archimer.ifremer.fr/doc/00678/79035/81471.pdf https://archimer.ifremer.fr/doc/00678/79035/81472.xlsx https://doi.org/10.1029/2020PA003994 https://archimer.ifremer.fr/doc/00678/79035/ |
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ftarchimer:oai:archimer.ifremer.fr:79035 2023-05-15T13:47:37+02:00 New magnetostratigraphic insights from Iceberg Alley on the rhythms of Antarctic climate during the Plio‐Pleistocene Reilly, Brendan T. Tauxe, Lisa Brachfeld, Stefanie Raymo, Maureen Bailey, Ian Hemming, Sidney Weber, Michael E. Williams, Trevor Garcia, Marga Guitard, Michelle Martos, Yasmina M. Pérez, Lara F. Zheng, Xufeng Armbrecht, Linda Cardillo, Fabricio G. Du, Zhiheng Fauth, Gerson Glueder, Anna Gutjahr, Marcus Hernández‐almeida, Iván Hoem, Frida S. Hwang, Ji‐hwan Iizuka, Mutsumi Kato, Yuji Kenlee, Bridget O’connell, Suzanne Peck, Victoria Ronge, Thomas A. Seki, Osamu Tripathi, Shubham Warnock, Jonathan 2021-02 application/pdf https://archimer.ifremer.fr/doc/00678/79035/81470.pdf https://archimer.ifremer.fr/doc/00678/79035/81471.pdf https://archimer.ifremer.fr/doc/00678/79035/81472.xlsx https://doi.org/10.1029/2020PA003994 https://archimer.ifremer.fr/doc/00678/79035/ eng eng American Geophysical Union (AGU) https://archimer.ifremer.fr/doc/00678/79035/81470.pdf https://archimer.ifremer.fr/doc/00678/79035/81471.pdf https://archimer.ifremer.fr/doc/00678/79035/81472.xlsx doi:10.1029/2020PA003994 https://archimer.ifremer.fr/doc/00678/79035/ info:eu-repo/semantics/openAccess restricted use Paleoceanography And Paleoclimatology (2572-4517) (American Geophysical Union (AGU)), 2021-02 , Vol. 36 , N. 2 , P. e2020PA003994 (27p.) Antarctica Dove Basin Iceberg Alley International Ocean Discovery Program (IODP) magnetostratigraphy Scotia Sea text Publication info:eu-repo/semantics/article 2021 ftarchimer https://doi.org/10.1029/2020PA003994 2021-10-05T22:48:30Z International Ocean Discovery Program (IODP) Expedition 382 in the Scotia Sea’s Iceberg Alley recovered among the most continuous and highest resolution stratigraphic records in the Southern Ocean near Antarctica spanning the last 3.3 Myr. Sites drilled in Dove Basin (U1536/U1537) have well‐resolved magnetostratigraphy and a strong imprint of orbital forcing in their lithostratigraphy. All magnetic reversals of the last 3.3 Myr are identified, providing a robust age model independent of orbital tuning. During the Pleistocene, alternation of terrigenous versus diatomaceous facies shows power in the eccentricity and obliquity frequencies comparable to the amplitude modulation of benthic δ18O records. This suggests that variations in Dove Basin lithostratigraphy during the Pleistocene reflect a similar history as globally integrated ice volume at these frequencies. However, power in the precession frequencies over the entire ∼3.3 Myr record does not match the amplitude modulation of benthic δ18O records, suggesting Dove Basin contains a unique record at these frequencies. Comparing the position of magnetic reversals relative to local facies changes in Dove Basin and the same magnetic reversals relative to benthic δ18O at North Atlantic IODP Site U1308, we demonstrate Dove Basin facies change at different times than benthic δ18O during intervals between ∼3 and 1 Ma. These differences are consistent with precession phase shifts and suggest climate signals with a Southern Hemisphere summer insolation phase were recorded around Antarctica. If Dove Basin lithology reflects local Antarctic ice volume changes, these signals could represent ice sheet precession‐paced variations not captured in benthic δ18O during the 41‐kyr world. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Iceberg* North Atlantic Scotia Sea Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Scotia Sea Southern Ocean Paleoceanography and Paleoclimatology 36 2 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Antarctica Dove Basin Iceberg Alley International Ocean Discovery Program (IODP) magnetostratigraphy Scotia Sea |
spellingShingle |
Antarctica Dove Basin Iceberg Alley International Ocean Discovery Program (IODP) magnetostratigraphy Scotia Sea Reilly, Brendan T. Tauxe, Lisa Brachfeld, Stefanie Raymo, Maureen Bailey, Ian Hemming, Sidney Weber, Michael E. Williams, Trevor Garcia, Marga Guitard, Michelle Martos, Yasmina M. Pérez, Lara F. Zheng, Xufeng Armbrecht, Linda Cardillo, Fabricio G. Du, Zhiheng Fauth, Gerson Glueder, Anna Gutjahr, Marcus Hernández‐almeida, Iván Hoem, Frida S. Hwang, Ji‐hwan Iizuka, Mutsumi Kato, Yuji Kenlee, Bridget O’connell, Suzanne Peck, Victoria Ronge, Thomas A. Seki, Osamu Tripathi, Shubham Warnock, Jonathan New magnetostratigraphic insights from Iceberg Alley on the rhythms of Antarctic climate during the Plio‐Pleistocene |
topic_facet |
Antarctica Dove Basin Iceberg Alley International Ocean Discovery Program (IODP) magnetostratigraphy Scotia Sea |
description |
International Ocean Discovery Program (IODP) Expedition 382 in the Scotia Sea’s Iceberg Alley recovered among the most continuous and highest resolution stratigraphic records in the Southern Ocean near Antarctica spanning the last 3.3 Myr. Sites drilled in Dove Basin (U1536/U1537) have well‐resolved magnetostratigraphy and a strong imprint of orbital forcing in their lithostratigraphy. All magnetic reversals of the last 3.3 Myr are identified, providing a robust age model independent of orbital tuning. During the Pleistocene, alternation of terrigenous versus diatomaceous facies shows power in the eccentricity and obliquity frequencies comparable to the amplitude modulation of benthic δ18O records. This suggests that variations in Dove Basin lithostratigraphy during the Pleistocene reflect a similar history as globally integrated ice volume at these frequencies. However, power in the precession frequencies over the entire ∼3.3 Myr record does not match the amplitude modulation of benthic δ18O records, suggesting Dove Basin contains a unique record at these frequencies. Comparing the position of magnetic reversals relative to local facies changes in Dove Basin and the same magnetic reversals relative to benthic δ18O at North Atlantic IODP Site U1308, we demonstrate Dove Basin facies change at different times than benthic δ18O during intervals between ∼3 and 1 Ma. These differences are consistent with precession phase shifts and suggest climate signals with a Southern Hemisphere summer insolation phase were recorded around Antarctica. If Dove Basin lithology reflects local Antarctic ice volume changes, these signals could represent ice sheet precession‐paced variations not captured in benthic δ18O during the 41‐kyr world. |
format |
Article in Journal/Newspaper |
author |
Reilly, Brendan T. Tauxe, Lisa Brachfeld, Stefanie Raymo, Maureen Bailey, Ian Hemming, Sidney Weber, Michael E. Williams, Trevor Garcia, Marga Guitard, Michelle Martos, Yasmina M. Pérez, Lara F. Zheng, Xufeng Armbrecht, Linda Cardillo, Fabricio G. Du, Zhiheng Fauth, Gerson Glueder, Anna Gutjahr, Marcus Hernández‐almeida, Iván Hoem, Frida S. Hwang, Ji‐hwan Iizuka, Mutsumi Kato, Yuji Kenlee, Bridget O’connell, Suzanne Peck, Victoria Ronge, Thomas A. Seki, Osamu Tripathi, Shubham Warnock, Jonathan |
author_facet |
Reilly, Brendan T. Tauxe, Lisa Brachfeld, Stefanie Raymo, Maureen Bailey, Ian Hemming, Sidney Weber, Michael E. Williams, Trevor Garcia, Marga Guitard, Michelle Martos, Yasmina M. Pérez, Lara F. Zheng, Xufeng Armbrecht, Linda Cardillo, Fabricio G. Du, Zhiheng Fauth, Gerson Glueder, Anna Gutjahr, Marcus Hernández‐almeida, Iván Hoem, Frida S. Hwang, Ji‐hwan Iizuka, Mutsumi Kato, Yuji Kenlee, Bridget O’connell, Suzanne Peck, Victoria Ronge, Thomas A. Seki, Osamu Tripathi, Shubham Warnock, Jonathan |
author_sort |
Reilly, Brendan T. |
title |
New magnetostratigraphic insights from Iceberg Alley on the rhythms of Antarctic climate during the Plio‐Pleistocene |
title_short |
New magnetostratigraphic insights from Iceberg Alley on the rhythms of Antarctic climate during the Plio‐Pleistocene |
title_full |
New magnetostratigraphic insights from Iceberg Alley on the rhythms of Antarctic climate during the Plio‐Pleistocene |
title_fullStr |
New magnetostratigraphic insights from Iceberg Alley on the rhythms of Antarctic climate during the Plio‐Pleistocene |
title_full_unstemmed |
New magnetostratigraphic insights from Iceberg Alley on the rhythms of Antarctic climate during the Plio‐Pleistocene |
title_sort |
new magnetostratigraphic insights from iceberg alley on the rhythms of antarctic climate during the plio‐pleistocene |
publisher |
American Geophysical Union (AGU) |
publishDate |
2021 |
url |
https://archimer.ifremer.fr/doc/00678/79035/81470.pdf https://archimer.ifremer.fr/doc/00678/79035/81471.pdf https://archimer.ifremer.fr/doc/00678/79035/81472.xlsx https://doi.org/10.1029/2020PA003994 https://archimer.ifremer.fr/doc/00678/79035/ |
geographic |
Antarctic Scotia Sea Southern Ocean |
geographic_facet |
Antarctic Scotia Sea Southern Ocean |
genre |
Antarc* Antarctic Antarctica Ice Sheet Iceberg* North Atlantic Scotia Sea Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Iceberg* North Atlantic Scotia Sea Southern Ocean |
op_source |
Paleoceanography And Paleoclimatology (2572-4517) (American Geophysical Union (AGU)), 2021-02 , Vol. 36 , N. 2 , P. e2020PA003994 (27p.) |
op_relation |
https://archimer.ifremer.fr/doc/00678/79035/81470.pdf https://archimer.ifremer.fr/doc/00678/79035/81471.pdf https://archimer.ifremer.fr/doc/00678/79035/81472.xlsx doi:10.1029/2020PA003994 https://archimer.ifremer.fr/doc/00678/79035/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2020PA003994 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
36 |
container_issue |
2 |
_version_ |
1766247526604734464 |