Miocene to present oceanographic variability in the Scotia Sea and Antarctic ice sheets dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382
This is the final version. Available on open access from Elsevier via the DOI in this record Scotia Sea and the Drake Passage is key towards understanding the development of modern oceanic circulation patterns and their implications for ice sheet growth and decay. The sedimentary record of the south...
Published in: | Earth and Planetary Science Letters |
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Online Access: | http://hdl.handle.net/10871/123450 https://doi.org/10.1016/j.epsl.2020.116657 |
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ftunivexeter:oai:ore.exeter.ac.uk:10871/123450 2024-09-15T17:42:14+00:00 Miocene to present oceanographic variability in the Scotia Sea and Antarctic ice sheets dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382 Pérez, LA Martos, YM García, M Weber, ME Raymo, ME Williams, T Bohoyo, F Armbrecht, L Bailey, I Brachfeld, S Glüder, A Guitard, M Gutjahr, M Hemming, S Hernández-Almeida, I Hoem, FS Kato, Y O'Connell, S Peck, V Reilly, B Ronge, TA Tauxe, L Warnock, J Zheng, X 2020 http://hdl.handle.net/10871/123450 https://doi.org/10.1016/j.epsl.2020.116657 en eng Elsevier Vol. 553, article 116657 doi:10.1016/j.epsl.2020.116657 792773 NEB1782 97(GG009393 We2039/8-1 We 2039/17-1 CGL2015-74216-JIN NE/T006609/1 ALW.2016.001 http://hdl.handle.net/10871/123450 0012-821X Earth and Planetary Science Letters ©2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). https://creativecommons.org/licenses/by/4.0/ Drake Passage Scotia Sea IODP Expedition 382 oceanic gateways Antarctic ice sheets evolution core-log-seismic correlation Article 2020 ftunivexeter https://doi.org/10.1016/j.epsl.2020.116657 2024-07-29T03:24:13Z This is the final version. Available on open access from Elsevier via the DOI in this record Scotia Sea and the Drake Passage is key towards understanding the development of modern oceanic circulation patterns and their implications for ice sheet growth and decay. The sedimentary record of the southern Scotia Sea basins documents the regional tectonic, oceanographic and climatic evolution since the Eocene. However, a lack of accurate age estimations has prevented the calibration of the reconstructed history. The upper sedimentary record of the Scotia Sea was scientifically drilled for the first time in 2019 during International Ocean Discovery Program (IODP) Expedition 382, recovering sediments down to ∼643 and 676 m below sea floor in the Dove and Pirie basins respectively. Here, we report newly acquired high resolution physical properties data and the first accurate age constraints for the seismic sequences of the upper sedimentary record of the Scotia Sea to the late Miocene. The drilled record contains four basin-wide reflectors – Reflector-c, -b, -a and -a' previously estimated to be ∼12.6 Ma, ∼6.4 Ma, ∼3.8 Ma and ∼2.6 Ma, respectively. By extrapolating our new Scotia Sea age model to previous morpho-structural and seismic-stratigraphic analyses of the wider region we found, however, that the four discontinuities drilled are much younger than previously thought. Reflector-c actually formed before 8.4 Ma, Reflector-b at ∼4.5/3.7 Ma, Reflector-a at ∼1.7 Ma, and Reflector-a' at ∼0.4 Ma. Our updated age model of these discontinuities has major implications for their correlation with regional tectonic, oceanographic and cryospheric events. According to our results, the outflow of Antarctic Bottom Water to northern latitudes controlled the Antarctic Circumpolar Current flow from late Miocene. Subsequent variability of the Antarctic ice sheets has influenced the oceanic circulation pattern linked to major global climatic changes during early Pliocene, Mid-Pleistocene and the Marine Isotope Stage 11. Natural ... Article in Journal/Newspaper Antarc* Antarctic Drake Passage Ice Sheet Scotia Sea University of Exeter: Open Research Exeter (ORE) Earth and Planetary Science Letters 553 116657 |
institution |
Open Polar |
collection |
University of Exeter: Open Research Exeter (ORE) |
op_collection_id |
ftunivexeter |
language |
English |
topic |
Drake Passage Scotia Sea IODP Expedition 382 oceanic gateways Antarctic ice sheets evolution core-log-seismic correlation |
spellingShingle |
Drake Passage Scotia Sea IODP Expedition 382 oceanic gateways Antarctic ice sheets evolution core-log-seismic correlation Pérez, LA Martos, YM García, M Weber, ME Raymo, ME Williams, T Bohoyo, F Armbrecht, L Bailey, I Brachfeld, S Glüder, A Guitard, M Gutjahr, M Hemming, S Hernández-Almeida, I Hoem, FS Kato, Y O'Connell, S Peck, V Reilly, B Ronge, TA Tauxe, L Warnock, J Zheng, X Miocene to present oceanographic variability in the Scotia Sea and Antarctic ice sheets dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382 |
topic_facet |
Drake Passage Scotia Sea IODP Expedition 382 oceanic gateways Antarctic ice sheets evolution core-log-seismic correlation |
description |
This is the final version. Available on open access from Elsevier via the DOI in this record Scotia Sea and the Drake Passage is key towards understanding the development of modern oceanic circulation patterns and their implications for ice sheet growth and decay. The sedimentary record of the southern Scotia Sea basins documents the regional tectonic, oceanographic and climatic evolution since the Eocene. However, a lack of accurate age estimations has prevented the calibration of the reconstructed history. The upper sedimentary record of the Scotia Sea was scientifically drilled for the first time in 2019 during International Ocean Discovery Program (IODP) Expedition 382, recovering sediments down to ∼643 and 676 m below sea floor in the Dove and Pirie basins respectively. Here, we report newly acquired high resolution physical properties data and the first accurate age constraints for the seismic sequences of the upper sedimentary record of the Scotia Sea to the late Miocene. The drilled record contains four basin-wide reflectors – Reflector-c, -b, -a and -a' previously estimated to be ∼12.6 Ma, ∼6.4 Ma, ∼3.8 Ma and ∼2.6 Ma, respectively. By extrapolating our new Scotia Sea age model to previous morpho-structural and seismic-stratigraphic analyses of the wider region we found, however, that the four discontinuities drilled are much younger than previously thought. Reflector-c actually formed before 8.4 Ma, Reflector-b at ∼4.5/3.7 Ma, Reflector-a at ∼1.7 Ma, and Reflector-a' at ∼0.4 Ma. Our updated age model of these discontinuities has major implications for their correlation with regional tectonic, oceanographic and cryospheric events. According to our results, the outflow of Antarctic Bottom Water to northern latitudes controlled the Antarctic Circumpolar Current flow from late Miocene. Subsequent variability of the Antarctic ice sheets has influenced the oceanic circulation pattern linked to major global climatic changes during early Pliocene, Mid-Pleistocene and the Marine Isotope Stage 11. Natural ... |
format |
Article in Journal/Newspaper |
author |
Pérez, LA Martos, YM García, M Weber, ME Raymo, ME Williams, T Bohoyo, F Armbrecht, L Bailey, I Brachfeld, S Glüder, A Guitard, M Gutjahr, M Hemming, S Hernández-Almeida, I Hoem, FS Kato, Y O'Connell, S Peck, V Reilly, B Ronge, TA Tauxe, L Warnock, J Zheng, X |
author_facet |
Pérez, LA Martos, YM García, M Weber, ME Raymo, ME Williams, T Bohoyo, F Armbrecht, L Bailey, I Brachfeld, S Glüder, A Guitard, M Gutjahr, M Hemming, S Hernández-Almeida, I Hoem, FS Kato, Y O'Connell, S Peck, V Reilly, B Ronge, TA Tauxe, L Warnock, J Zheng, X |
author_sort |
Pérez, LA |
title |
Miocene to present oceanographic variability in the Scotia Sea and Antarctic ice sheets dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382 |
title_short |
Miocene to present oceanographic variability in the Scotia Sea and Antarctic ice sheets dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382 |
title_full |
Miocene to present oceanographic variability in the Scotia Sea and Antarctic ice sheets dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382 |
title_fullStr |
Miocene to present oceanographic variability in the Scotia Sea and Antarctic ice sheets dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382 |
title_full_unstemmed |
Miocene to present oceanographic variability in the Scotia Sea and Antarctic ice sheets dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382 |
title_sort |
miocene to present oceanographic variability in the scotia sea and antarctic ice sheets dynamics: insight from revised seismic-stratigraphy following iodp expedition 382 |
publisher |
Elsevier |
publishDate |
2020 |
url |
http://hdl.handle.net/10871/123450 https://doi.org/10.1016/j.epsl.2020.116657 |
genre |
Antarc* Antarctic Drake Passage Ice Sheet Scotia Sea |
genre_facet |
Antarc* Antarctic Drake Passage Ice Sheet Scotia Sea |
op_relation |
Vol. 553, article 116657 doi:10.1016/j.epsl.2020.116657 792773 NEB1782 97(GG009393 We2039/8-1 We 2039/17-1 CGL2015-74216-JIN NE/T006609/1 ALW.2016.001 http://hdl.handle.net/10871/123450 0012-821X Earth and Planetary Science Letters |
op_rights |
©2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1016/j.epsl.2020.116657 |
container_title |
Earth and Planetary Science Letters |
container_volume |
553 |
container_start_page |
116657 |
_version_ |
1810488752023273472 |