Seismic stratigraphy and glacial cycles in the inland passages of the Magallanes Region of Chile, southernmost South America
We present results of a marine geophysical survey that imaged submarine sedimentary and geomorphic features of the main inland channels of the Magallanes Region of Chile, in southernmost South America. This region holds a remarkable terrestrial and marine record of glacial variations in the closest...
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Online Access: | https://doi.org/10.1016/j.margeo.2017.02.006 https://archimer.ifremer.fr/doc/00420/53166/55263.pdf https://archimer.ifremer.fr/doc/00420/53166/ |
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fttriple:oai:gotriple.eu:10670/1.z5qomr 2023-05-15T13:56:24+02:00 Seismic stratigraphy and glacial cycles in the inland passages of the Magallanes Region of Chile, southernmost South America Fernandez, Rodrigo Gulick, Sean Rodrigo, Cristian Domack, Eugene Leventer, Amy https://doi.org/10.1016/j.margeo.2017.02.006 https://archimer.ifremer.fr/doc/00420/53166/55263.pdf https://archimer.ifremer.fr/doc/00420/53166/ en eng Elsevier Science Bv doi:10.1016/j.margeo.2017.02.006 10670/1.z5qomr https://archimer.ifremer.fr/doc/00420/53166/55263.pdf https://archimer.ifremer.fr/doc/00420/53166/ other Archimer, archive institutionnelle de l'Ifremer Marine Geology (0025-3227) (Elsevier Science Bv), 2017-04 , Vol. 386 , P. 19-31 geo demo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1016/j.margeo.2017.02.006 2023-01-22T18:02:19Z We present results of a marine geophysical survey that imaged submarine sedimentary and geomorphic features of the main inland channels of the Magallanes Region of Chile, in southernmost South America. This region holds a remarkable terrestrial and marine record of glacial variations in the closest landmass to Antarctica. We report evidence for grounded ice along the main channels associated with two ice lobes that flowed from Cordillera Darwin, part of the Austral Andes, into Central Estrecho de Magallanes and Seno Almirantazgo. Multibeam data show drumlins and glacial lineations in Whiteside Channel the northern continuation of Seno Almirantazgo, and iceberg plough marks in Central Estrecho de Magallanes. Multichannel seismic data show a complex array of seismic facies, interpreted as representing two main types of sedimentary units: glacimarine sediments, corresponding to glacial periods, and pelagic sediments, corresponding to interglacial periods. We find that there are two interglacial-glacial cycles represented in this marine sedimentary record. Chronologically: 1) the youngest glacial unit corresponds to the last regional glaciation (similar to 31-18 ka); 2) these passageways deglaciated with the retreat from regional glacial limit 'D' (similar to 17-18 ka), and 3) there is no marine sedimentary or morphological evidence that the Magallanes glaciers readvanced into the main passageways during the Antarctic Cold Reversal (similar to 14-13 ka). These findings suggest that final deglaciation of southernmost South America was driven by the atmospheric and ocean warming that started similar to 18 ka as recorded in Antarctic ice core records and sea surface temperature proxies offshore the Magallanes Region. Text Antarc* Antarctic Antarctica ice core Iceberg* Unknown Almirantazgo ENVELOPE(-58.433,-58.433,-62.133,-62.133) Antarctic Austral Estrecho ENVELOPE(-60.783,-60.783,-62.467,-62.467) Magallanes ENVELOPE(-62.933,-62.933,-64.883,-64.883) The Antarctic Whiteside ENVELOPE(59.483,59.483,-67.317,-67.317) Marine Geology 386 19 31 |
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Open Polar |
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fttriple |
language |
English |
topic |
geo demo |
spellingShingle |
geo demo Fernandez, Rodrigo Gulick, Sean Rodrigo, Cristian Domack, Eugene Leventer, Amy Seismic stratigraphy and glacial cycles in the inland passages of the Magallanes Region of Chile, southernmost South America |
topic_facet |
geo demo |
description |
We present results of a marine geophysical survey that imaged submarine sedimentary and geomorphic features of the main inland channels of the Magallanes Region of Chile, in southernmost South America. This region holds a remarkable terrestrial and marine record of glacial variations in the closest landmass to Antarctica. We report evidence for grounded ice along the main channels associated with two ice lobes that flowed from Cordillera Darwin, part of the Austral Andes, into Central Estrecho de Magallanes and Seno Almirantazgo. Multibeam data show drumlins and glacial lineations in Whiteside Channel the northern continuation of Seno Almirantazgo, and iceberg plough marks in Central Estrecho de Magallanes. Multichannel seismic data show a complex array of seismic facies, interpreted as representing two main types of sedimentary units: glacimarine sediments, corresponding to glacial periods, and pelagic sediments, corresponding to interglacial periods. We find that there are two interglacial-glacial cycles represented in this marine sedimentary record. Chronologically: 1) the youngest glacial unit corresponds to the last regional glaciation (similar to 31-18 ka); 2) these passageways deglaciated with the retreat from regional glacial limit 'D' (similar to 17-18 ka), and 3) there is no marine sedimentary or morphological evidence that the Magallanes glaciers readvanced into the main passageways during the Antarctic Cold Reversal (similar to 14-13 ka). These findings suggest that final deglaciation of southernmost South America was driven by the atmospheric and ocean warming that started similar to 18 ka as recorded in Antarctic ice core records and sea surface temperature proxies offshore the Magallanes Region. |
format |
Text |
author |
Fernandez, Rodrigo Gulick, Sean Rodrigo, Cristian Domack, Eugene Leventer, Amy |
author_facet |
Fernandez, Rodrigo Gulick, Sean Rodrigo, Cristian Domack, Eugene Leventer, Amy |
author_sort |
Fernandez, Rodrigo |
title |
Seismic stratigraphy and glacial cycles in the inland passages of the Magallanes Region of Chile, southernmost South America |
title_short |
Seismic stratigraphy and glacial cycles in the inland passages of the Magallanes Region of Chile, southernmost South America |
title_full |
Seismic stratigraphy and glacial cycles in the inland passages of the Magallanes Region of Chile, southernmost South America |
title_fullStr |
Seismic stratigraphy and glacial cycles in the inland passages of the Magallanes Region of Chile, southernmost South America |
title_full_unstemmed |
Seismic stratigraphy and glacial cycles in the inland passages of the Magallanes Region of Chile, southernmost South America |
title_sort |
seismic stratigraphy and glacial cycles in the inland passages of the magallanes region of chile, southernmost south america |
publisher |
Elsevier Science Bv |
url |
https://doi.org/10.1016/j.margeo.2017.02.006 https://archimer.ifremer.fr/doc/00420/53166/55263.pdf https://archimer.ifremer.fr/doc/00420/53166/ |
long_lat |
ENVELOPE(-58.433,-58.433,-62.133,-62.133) ENVELOPE(-60.783,-60.783,-62.467,-62.467) ENVELOPE(-62.933,-62.933,-64.883,-64.883) ENVELOPE(59.483,59.483,-67.317,-67.317) |
geographic |
Almirantazgo Antarctic Austral Estrecho Magallanes The Antarctic Whiteside |
geographic_facet |
Almirantazgo Antarctic Austral Estrecho Magallanes The Antarctic Whiteside |
genre |
Antarc* Antarctic Antarctica ice core Iceberg* |
genre_facet |
Antarc* Antarctic Antarctica ice core Iceberg* |
op_source |
Archimer, archive institutionnelle de l'Ifremer Marine Geology (0025-3227) (Elsevier Science Bv), 2017-04 , Vol. 386 , P. 19-31 |
op_relation |
doi:10.1016/j.margeo.2017.02.006 10670/1.z5qomr https://archimer.ifremer.fr/doc/00420/53166/55263.pdf https://archimer.ifremer.fr/doc/00420/53166/ |
op_rights |
other |
op_doi |
https://doi.org/10.1016/j.margeo.2017.02.006 |
container_title |
Marine Geology |
container_volume |
386 |
container_start_page |
19 |
op_container_end_page |
31 |
_version_ |
1766263907931914240 |