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...

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Published in:Paleoceanography and Paleoclimatology
Main Authors: Reilly, B.T., Tauxe, L., Brachfeld, S., Raymo, M., Bailey, I., Hemming, S., Weber, M., Williams, T., García-García, M. (Margarita), Otros
Format: Article in Journal/Newspaper
Language:English
Published: Centro Oceanográfico de Cádiz 2021
Subjects:
Online Access:http://hdl.handle.net/10508/11958
https://doi.org/10.1029/2020PA003994
id ftieo:oai:repositorio.ieo.es:10508/11958
record_format openpolar
spelling ftieo:oai:repositorio.ieo.es:10508/11958 2023-05-15T13:41:25+02:00 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, M. (Margarita) Otros 2021-09-27T11:21:20Z http://hdl.handle.net/10508/11958 https://doi.org/10.1029/2020PA003994 eng eng Centro Oceanográfico de Cádiz 2572-4525 http://hdl.handle.net/10508/11958 Paleoceanography and Paleoclimatology, 36. 2021: 1-27 doi:10.1029/2020PA003994 openAccess Magneto-estratigrafía Antártida Plio-Pleistoceno magnetostratigraphy facies amplitude magnetic reversals pleistocene article 2021 ftieo https://doi.org/10.1029/2020PA003994 2022-07-26T23:49:17Z 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. Postprint Article in Journal/Newspaper Antarc* Antarctic Antarctica Antártida Ice Sheet Iceberg* North Atlantic Southern Ocean Instituto Español de Oceanografía: e-IEO Antarctic Southern Ocean Paleoceanography and Paleoclimatology 36 2
institution Open Polar
collection Instituto Español de Oceanografía: e-IEO
op_collection_id ftieo
language English
topic Magneto-estratigrafía
Antártida
Plio-Pleistoceno
magnetostratigraphy
facies
amplitude
magnetic reversals
pleistocene
spellingShingle Magneto-estratigrafía
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, M. (Margarita)
Otros
New magnetostratigraphic insights from Iceberg Alley on the rhythms of Antarctic climate during the Plio‐Pleistocene
topic_facet Magneto-estratigrafía
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. Postprint
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, M. (Margarita)
Otros
author_facet Reilly, B.T.
Tauxe, L.
Brachfeld, S.
Raymo, M.
Bailey, I.
Hemming, S.
Weber, M.
Williams, T.
García-García, M. (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
publisher Centro Oceanográfico de Cádiz
publishDate 2021
url http://hdl.handle.net/10508/11958
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 2572-4525
http://hdl.handle.net/10508/11958
Paleoceanography and Paleoclimatology, 36. 2021: 1-27
doi:10.1029/2020PA003994
op_rights openAccess
op_doi https://doi.org/10.1029/2020PA003994
container_title Paleoceanography and Paleoclimatology
container_volume 36
container_issue 2
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