Miocene to present oceanographic variability in the Scotia Sea and Antarctic Ice Sheet dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382
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 s...
Published in: | Earth and Planetary Science Letters |
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Online Access: | http://hdl.handle.net/10508/11755 http://hdl.handle.net/10261/318978 https://doi.org/10.1016/j.epsl.2020.116657 |
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ftcsic:oai:digital.csic.es:10261/318978 2024-02-11T09:57:40+01:00 Miocene to present oceanographic variability in the Scotia Sea and Antarctic Ice Sheet dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382 Pérez, Lara Martos, Yasmina García-García, Margarita Weber, M. Raymo, M. Williams, T. 2020-01-01 http://hdl.handle.net/10508/11755 http://hdl.handle.net/10261/318978 https://doi.org/10.1016/j.epsl.2020.116657 en eng Centro Oceanográfico de Cádiz Postprint Earth and Planetary Science Letters, 553. 2020: 1-15 http://hdl.handle.net/10508/11755 http://hdl.handle.net/10261/318978 doi:10.1016/j.epsl.2020.116657 22727 open Medio Marino Drake Passage Centro Oceanográfico de Cádiz Scotia Sea IODP Expedition 382 oceanic gateways Antarctic ice sheets evolutio ncore-log-seismic correlation artículo http://purl.org/coar/resource_type/c_6501 2020 ftcsic https://doi.org/10.1016/j.epsl.2020.116657 2024-01-16T11:45:21Z 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. SI Article in Journal/Newspaper Antarc* Antarctic Drake Passage Ice Sheet Scotia Sea Digital.CSIC (Spanish National Research Council) Antarctic The Antarctic Drake Passage Scotia Sea Pirie ENVELOPE(-44.633,-44.633,-60.700,-60.700) Earth and Planetary Science Letters 553 116657 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Medio Marino Drake Passage Centro Oceanográfico de Cádiz Scotia Sea IODP Expedition 382 oceanic gateways Antarctic ice sheets evolutio ncore-log-seismic correlation |
spellingShingle |
Medio Marino Drake Passage Centro Oceanográfico de Cádiz Scotia Sea IODP Expedition 382 oceanic gateways Antarctic ice sheets evolutio ncore-log-seismic correlation Pérez, Lara Martos, Yasmina García-García, Margarita Weber, M. Raymo, M. Williams, T. Miocene to present oceanographic variability in the Scotia Sea and Antarctic Ice Sheet dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382 |
topic_facet |
Medio Marino Drake Passage Centro Oceanográfico de Cádiz Scotia Sea IODP Expedition 382 oceanic gateways Antarctic ice sheets evolutio ncore-log-seismic correlation |
description |
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. SI |
format |
Article in Journal/Newspaper |
author |
Pérez, Lara Martos, Yasmina García-García, Margarita Weber, M. Raymo, M. Williams, T. |
author_facet |
Pérez, Lara Martos, Yasmina García-García, Margarita Weber, M. Raymo, M. Williams, T. |
author_sort |
Pérez, Lara |
title |
Miocene to present oceanographic variability in the Scotia Sea and Antarctic Ice Sheet dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382 |
title_short |
Miocene to present oceanographic variability in the Scotia Sea and Antarctic Ice Sheet dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382 |
title_full |
Miocene to present oceanographic variability in the Scotia Sea and Antarctic Ice Sheet dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382 |
title_fullStr |
Miocene to present oceanographic variability in the Scotia Sea and Antarctic Ice Sheet 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 Sheet dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382 |
title_sort |
miocene to present oceanographic variability in the scotia sea and antarctic ice sheet dynamics: insight from revised seismic-stratigraphy following iodp expedition 382 |
publishDate |
2020 |
url |
http://hdl.handle.net/10508/11755 http://hdl.handle.net/10261/318978 https://doi.org/10.1016/j.epsl.2020.116657 |
long_lat |
ENVELOPE(-44.633,-44.633,-60.700,-60.700) |
geographic |
Antarctic The Antarctic Drake Passage Scotia Sea Pirie |
geographic_facet |
Antarctic The Antarctic Drake Passage Scotia Sea Pirie |
genre |
Antarc* Antarctic Drake Passage Ice Sheet Scotia Sea |
genre_facet |
Antarc* Antarctic Drake Passage Ice Sheet Scotia Sea |
op_relation |
Centro Oceanográfico de Cádiz Postprint Earth and Planetary Science Letters, 553. 2020: 1-15 http://hdl.handle.net/10508/11755 http://hdl.handle.net/10261/318978 doi:10.1016/j.epsl.2020.116657 22727 |
op_rights |
open |
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_ |
1790593210153697280 |