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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Online Access: | http://hdl.handle.net/10508/11958 http://hdl.handle.net/10261/319013 https://doi.org/10.1029/2020PA003994 |
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ftcsic:oai:digital.csic.es:10261/319013 2024-02-11T09:58:07+01:00 New magnetostratigraphic insights from Iceberg Alley on the rhythms of Antarctic climate during the Plio‐Pleistocene Reilly, B.T. Tauxe, L. Brachfeld, S. Raymo, M. Bailey, I. Hemming, S. Weber, M. Williams, T. García-García, Margarita Otros 2021-01-18 http://hdl.handle.net/10508/11958 http://hdl.handle.net/10261/319013 https://doi.org/10.1029/2020PA003994 en eng Centro Oceanográfico de Cádiz 2050-09-23 Postprint Paleoceanography and Paleoclimatology, 36. 2021: 1-27 2572-4525 http://hdl.handle.net/10508/11958 http://hdl.handle.net/10261/319013 doi:10.1029/2020PA003994 22915 embargo_20500923 Magneto-estratigrafía Medio Marino Centro Oceanográfico de Cádiz Antártida Plio-Pleistoceno magnetostratigraphy facies amplitude magnetic reversals pleistocene artículo http://purl.org/coar/resource_type/c_6501 2021 ftcsic https://doi.org/10.1029/2020PA003994 2024-01-16T11:45:21Z 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. SI Article in Journal/Newspaper Antarc* Antarctic Antarctica Antártida Ice Sheet Iceberg* North Atlantic Southern Ocean Digital.CSIC (Spanish National Research Council) Antarctic Southern Ocean Paleoceanography and Paleoclimatology 36 2 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Magneto-estratigrafía Medio Marino Centro Oceanográfico de Cádiz Antártida Plio-Pleistoceno magnetostratigraphy facies amplitude magnetic reversals pleistocene |
spellingShingle |
Magneto-estratigrafía Medio Marino Centro Oceanográfico de Cádiz Antártida Plio-Pleistoceno magnetostratigraphy facies amplitude magnetic reversals pleistocene Reilly, B.T. Tauxe, L. Brachfeld, S. Raymo, M. Bailey, I. Hemming, S. Weber, M. Williams, T. García-García, Margarita Otros New magnetostratigraphic insights from Iceberg Alley on the rhythms of Antarctic climate during the Plio‐Pleistocene |
topic_facet |
Magneto-estratigrafía Medio Marino Centro Oceanográfico de Cádiz Antártida Plio-Pleistoceno magnetostratigraphy facies amplitude magnetic reversals pleistocene |
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. SI |
format |
Article in Journal/Newspaper |
author |
Reilly, B.T. Tauxe, L. Brachfeld, S. Raymo, M. Bailey, I. Hemming, S. Weber, M. Williams, T. García-García, Margarita Otros |
author_facet |
Reilly, B.T. Tauxe, L. Brachfeld, S. Raymo, M. Bailey, I. Hemming, S. Weber, M. Williams, T. García-García, Margarita Otros |
author_sort |
Reilly, B.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 |
publishDate |
2021 |
url |
http://hdl.handle.net/10508/11958 http://hdl.handle.net/10261/319013 https://doi.org/10.1029/2020PA003994 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Antarctica Antártida Ice Sheet Iceberg* North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Antártida Ice Sheet Iceberg* North Atlantic Southern Ocean |
op_relation |
Centro Oceanográfico de Cádiz 2050-09-23 Postprint Paleoceanography and Paleoclimatology, 36. 2021: 1-27 2572-4525 http://hdl.handle.net/10508/11958 http://hdl.handle.net/10261/319013 doi:10.1029/2020PA003994 22915 |
op_rights |
embargo_20500923 |
op_doi |
https://doi.org/10.1029/2020PA003994 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
36 |
container_issue |
2 |
_version_ |
1790593690730758144 |