Cenozoic ice sheets and ocean variability controls on sedimentation in glaciated margins
The Antarctic Circumpolar Current (ACC) connects all major ocean basins, links the deep and shallow layers of the oceans and has a strong influence on global ocean circulation, biogeochemical cycles, the stability of the Antarctic ice sheet and thereby Earth´s climate system. However, the timing of...
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2020
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ftcsic:oai:digital.csic.es:10261/233785 2024-02-11T09:57:15+01:00 Cenozoic ice sheets and ocean variability controls on sedimentation in glaciated margins Evangelinos, Dimitris Escutia, Carlota Ministerio de Ciencia e Innovación (España) 2020-07-08 uri: http://hdl.handle.net/10481/63903 http://hdl.handle.net/10261/233785 https://doi.org/10.13039/501100004837 unknown Universidad de Granada #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2014-60451-C2-1-P info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/CTM2017- 89711-C2-1-P Publisher's version http://hdl.handle.net/10481/63903 Sí isbn: 978-84-1306-635-6 uri: http://hdl.handle.net/10481/63903 Evangelinos, Dimitris. Cenozoic ice sheets and ocean variability controls on sedimentation in glaciated margins. Granada: Universidad de Granada, 2020. http://hdl.handle.net/10261/233785 http://dx.doi.org/10.13039/501100004837 open Glaciares Sedimentos Aguas profundas Corriente Circumpolar Antártica Glaciers Sediments The Antarctic Circumpolar Current tesis doctoral http://purl.org/coar/resource_type/c_db06 2020 ftcsic https://doi.org/10.13039/501100004837 2024-01-16T11:04:31Z The Antarctic Circumpolar Current (ACC) connects all major ocean basins, links the deep and shallow layers of the oceans and has a strong influence on global ocean circulation, biogeochemical cycles, the stability of the Antarctic ice sheet and thereby Earth´s climate system. However, the timing of the onset of the ACC and the establishment of a vigorous, deep circumpolar flow, similar to presentday remain controversial. Moreover, the links between the ACC and the Antarctic ice sheet in past warmer than today climates are poorly known. This knowledge is essential for improving our understanding on ACC-Antarctic ice sheet interactions in the ongoing climate warming that can inform coupled ocean-ice sheet global climate models used to forecast future changes. In this context, this PhD thesis aims to advance our understanding on the evolution of the ACC since its initiation (proto-ACC) to the time when the modern deep ACC is established over the last 34 million years (Ma). In addition, we aim to relate proto-ACC dynamics offshore the eastern Wilkes Land margin to Antarctic ice sheet behaviour during the warm late Oligocene and the earliest Miocene (24-23 Ma), including the second major Antarctic glaciation (23.03 Ma). To achieve these objectives, we conducted sedimentological, geochemical, and isotopic analyses on sedimentary sequences recovered by the Deep Sea Drilling Project Leg 28 (Sites 269 and 274) and Leg 29 (Site 278) across both sides of the Tasmanian Gateway. In addition, we conducted a study in the glaciated margins of Lake Baikal (Russia). There the tectonic and sea level histories are well known allowing us to test, using bathymetric and seismic reflection data, the climate vs. sea-level changes and tectonic controls on deep-water deposition in glaciated margins. This PhD Thesis shows that between 34-30 Ma, deep waters from the South Atlantic and Indian Ocean did not flow into the Southwest Pacific via the Tasmanian Gateway. Instead, the Southwest Pacific deep water circulation was characterised by the ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Antártica Ice Sheet Wilkes Land Digital.CSIC (Spanish National Research Council) Antarctic Indian Pacific The Antarctic Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
topic |
Glaciares Sedimentos Aguas profundas Corriente Circumpolar Antártica Glaciers Sediments The Antarctic Circumpolar Current |
spellingShingle |
Glaciares Sedimentos Aguas profundas Corriente Circumpolar Antártica Glaciers Sediments The Antarctic Circumpolar Current Evangelinos, Dimitris Cenozoic ice sheets and ocean variability controls on sedimentation in glaciated margins |
topic_facet |
Glaciares Sedimentos Aguas profundas Corriente Circumpolar Antártica Glaciers Sediments The Antarctic Circumpolar Current |
description |
The Antarctic Circumpolar Current (ACC) connects all major ocean basins, links the deep and shallow layers of the oceans and has a strong influence on global ocean circulation, biogeochemical cycles, the stability of the Antarctic ice sheet and thereby Earth´s climate system. However, the timing of the onset of the ACC and the establishment of a vigorous, deep circumpolar flow, similar to presentday remain controversial. Moreover, the links between the ACC and the Antarctic ice sheet in past warmer than today climates are poorly known. This knowledge is essential for improving our understanding on ACC-Antarctic ice sheet interactions in the ongoing climate warming that can inform coupled ocean-ice sheet global climate models used to forecast future changes. In this context, this PhD thesis aims to advance our understanding on the evolution of the ACC since its initiation (proto-ACC) to the time when the modern deep ACC is established over the last 34 million years (Ma). In addition, we aim to relate proto-ACC dynamics offshore the eastern Wilkes Land margin to Antarctic ice sheet behaviour during the warm late Oligocene and the earliest Miocene (24-23 Ma), including the second major Antarctic glaciation (23.03 Ma). To achieve these objectives, we conducted sedimentological, geochemical, and isotopic analyses on sedimentary sequences recovered by the Deep Sea Drilling Project Leg 28 (Sites 269 and 274) and Leg 29 (Site 278) across both sides of the Tasmanian Gateway. In addition, we conducted a study in the glaciated margins of Lake Baikal (Russia). There the tectonic and sea level histories are well known allowing us to test, using bathymetric and seismic reflection data, the climate vs. sea-level changes and tectonic controls on deep-water deposition in glaciated margins. This PhD Thesis shows that between 34-30 Ma, deep waters from the South Atlantic and Indian Ocean did not flow into the Southwest Pacific via the Tasmanian Gateway. Instead, the Southwest Pacific deep water circulation was characterised by the ... |
author2 |
Escutia, Carlota Ministerio de Ciencia e Innovación (España) |
format |
Doctoral or Postdoctoral Thesis |
author |
Evangelinos, Dimitris |
author_facet |
Evangelinos, Dimitris |
author_sort |
Evangelinos, Dimitris |
title |
Cenozoic ice sheets and ocean variability controls on sedimentation in glaciated margins |
title_short |
Cenozoic ice sheets and ocean variability controls on sedimentation in glaciated margins |
title_full |
Cenozoic ice sheets and ocean variability controls on sedimentation in glaciated margins |
title_fullStr |
Cenozoic ice sheets and ocean variability controls on sedimentation in glaciated margins |
title_full_unstemmed |
Cenozoic ice sheets and ocean variability controls on sedimentation in glaciated margins |
title_sort |
cenozoic ice sheets and ocean variability controls on sedimentation in glaciated margins |
publisher |
Universidad de Granada |
publishDate |
2020 |
url |
http://hdl.handle.net/10261/233785 https://doi.org/10.13039/501100004837 |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Antarctic Indian Pacific The Antarctic Wilkes Land |
geographic_facet |
Antarctic Indian Pacific The Antarctic Wilkes Land |
genre |
Antarc* Antarctic Antártica Ice Sheet Wilkes Land |
genre_facet |
Antarc* Antarctic Antártica Ice Sheet Wilkes Land |
op_relation |
#PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2014-60451-C2-1-P info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/CTM2017- 89711-C2-1-P Publisher's version http://hdl.handle.net/10481/63903 Sí isbn: 978-84-1306-635-6 uri: http://hdl.handle.net/10481/63903 Evangelinos, Dimitris. Cenozoic ice sheets and ocean variability controls on sedimentation in glaciated margins. Granada: Universidad de Granada, 2020. http://hdl.handle.net/10261/233785 http://dx.doi.org/10.13039/501100004837 |
op_rights |
open |
op_doi |
https://doi.org/10.13039/501100004837 |
_version_ |
1790609545329901568 |