Seismic evidence of up to 200m lake-level change in Southern Patagonia since Marine Isotope Stage 4
Maar lake Laguna Potrok Aike is located north of the Strait of Magellan (south-eastern Patagonia). Seismic reflection profiles revealed a highly dynamic palaeoclimate history. Dunes were identified in the eastern part of the lake at approximately 30 to 80 m below the lake floor, overlying older lacu...
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Online Access: | https://doi.org/10.1111/j.1365-3091.2011.01296.x |
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fteawag:oai:dora:eawag_6877 2023-05-15T14:13:55+02:00 Seismic evidence of up to 200m lake-level change in Southern Patagonia since Marine Isotope Stage 4 Gebhardt, Andrea Catalina Ohlendorf, Christian Niessen, Frank De Batist, Marc Anselmetti, Flavio S. Ariztegui, Daniel Kliem, Pierre Wastegård, Stefan Zolitschka, Bernd 2012 https://doi.org/10.1111/j.1365-3091.2011.01296.x eng eng Wiley Sedimentology--Sedimentology--journals:2630--0037-0746 eawag:6877 journal id: journals:2630 issn: 0037-0746 ut: 000301718300018 local: 15227 scopus: 2-s2.0-84858705630 doi:10.1111/j.1365-3091.2011.01296.x Argentina climate change ICDP project PASADO lacustrine sedimentation Laguna Potrok Aike lake-level variations Patagonia seismic reflection profiles Text Journal Article 2012 fteawag https://doi.org/10.1111/j.1365-3091.2011.01296.x 2023-04-09T04:47:06Z Maar lake Laguna Potrok Aike is located north of the Strait of Magellan (south-eastern Patagonia). Seismic reflection profiles revealed a highly dynamic palaeoclimate history. Dunes were identified in the eastern part of the lake at approximately 30 to 80 m below the lake floor, overlying older lacustrine strata, and suggest that the region experienced dry conditions probably combined with strong westerly winds. It is quite likely that this can be linked to a major dust event recorded in the Antarctic ice cores during Marine Isotope Stage 4. The dunes are overlain by a series of palaeo-shorelines indicating a stepwise water-level evolution of a new lake established after this dry period, and thus a change towards wetter conditions. After the initial, rapid and stepwise lake-level rise, the basin became deeper and wider, and sediments deposited on the lake shoulder at approximately 33 m below present-day lake level point towards a long period of lake-level highstand between roughly 53·5 ka cal. bp and 30 ka cal. bp with a maximum lake level some 200 m higher than the desiccation horizon. This highstand was then followed by a regressional phase of uncertain age, although it must have happened some time between approximately 30 ka cal. bp and 6750 yrs cal. bp. Dryer conditions during the Mid-Holocene are evidenced by a dropping lake level, resulting in a basin-wide erosional unconformity on the lake shoulder. A second stepwise transgression between ca 5·8 to 5·4 ka cal. bp and ca 4·7 to 4 ka cal. bp with palaeo-shorelines deposited on the lake shoulder unconformity again indicates a change towards wetter conditions. Article in Journal/Newspaper Antarc* Antarctic DORA Eawag Antarctic The Antarctic Patagonia Argentina New Lake ENVELOPE(-109.468,-109.468,62.684,62.684) Level Point ENVELOPE(-55.731,-55.731,52.467,52.467) Sedimentology 59 3 1087 1100 |
institution |
Open Polar |
collection |
DORA Eawag |
op_collection_id |
fteawag |
language |
English |
topic |
Argentina climate change ICDP project PASADO lacustrine sedimentation Laguna Potrok Aike lake-level variations Patagonia seismic reflection profiles |
spellingShingle |
Argentina climate change ICDP project PASADO lacustrine sedimentation Laguna Potrok Aike lake-level variations Patagonia seismic reflection profiles Gebhardt, Andrea Catalina Ohlendorf, Christian Niessen, Frank De Batist, Marc Anselmetti, Flavio S. Ariztegui, Daniel Kliem, Pierre Wastegård, Stefan Zolitschka, Bernd Seismic evidence of up to 200m lake-level change in Southern Patagonia since Marine Isotope Stage 4 |
topic_facet |
Argentina climate change ICDP project PASADO lacustrine sedimentation Laguna Potrok Aike lake-level variations Patagonia seismic reflection profiles |
description |
Maar lake Laguna Potrok Aike is located north of the Strait of Magellan (south-eastern Patagonia). Seismic reflection profiles revealed a highly dynamic palaeoclimate history. Dunes were identified in the eastern part of the lake at approximately 30 to 80 m below the lake floor, overlying older lacustrine strata, and suggest that the region experienced dry conditions probably combined with strong westerly winds. It is quite likely that this can be linked to a major dust event recorded in the Antarctic ice cores during Marine Isotope Stage 4. The dunes are overlain by a series of palaeo-shorelines indicating a stepwise water-level evolution of a new lake established after this dry period, and thus a change towards wetter conditions. After the initial, rapid and stepwise lake-level rise, the basin became deeper and wider, and sediments deposited on the lake shoulder at approximately 33 m below present-day lake level point towards a long period of lake-level highstand between roughly 53·5 ka cal. bp and 30 ka cal. bp with a maximum lake level some 200 m higher than the desiccation horizon. This highstand was then followed by a regressional phase of uncertain age, although it must have happened some time between approximately 30 ka cal. bp and 6750 yrs cal. bp. Dryer conditions during the Mid-Holocene are evidenced by a dropping lake level, resulting in a basin-wide erosional unconformity on the lake shoulder. A second stepwise transgression between ca 5·8 to 5·4 ka cal. bp and ca 4·7 to 4 ka cal. bp with palaeo-shorelines deposited on the lake shoulder unconformity again indicates a change towards wetter conditions. |
format |
Article in Journal/Newspaper |
author |
Gebhardt, Andrea Catalina Ohlendorf, Christian Niessen, Frank De Batist, Marc Anselmetti, Flavio S. Ariztegui, Daniel Kliem, Pierre Wastegård, Stefan Zolitschka, Bernd |
author_facet |
Gebhardt, Andrea Catalina Ohlendorf, Christian Niessen, Frank De Batist, Marc Anselmetti, Flavio S. Ariztegui, Daniel Kliem, Pierre Wastegård, Stefan Zolitschka, Bernd |
author_sort |
Gebhardt, Andrea Catalina |
title |
Seismic evidence of up to 200m lake-level change in Southern Patagonia since Marine Isotope Stage 4 |
title_short |
Seismic evidence of up to 200m lake-level change in Southern Patagonia since Marine Isotope Stage 4 |
title_full |
Seismic evidence of up to 200m lake-level change in Southern Patagonia since Marine Isotope Stage 4 |
title_fullStr |
Seismic evidence of up to 200m lake-level change in Southern Patagonia since Marine Isotope Stage 4 |
title_full_unstemmed |
Seismic evidence of up to 200m lake-level change in Southern Patagonia since Marine Isotope Stage 4 |
title_sort |
seismic evidence of up to 200m lake-level change in southern patagonia since marine isotope stage 4 |
publisher |
Wiley |
publishDate |
2012 |
url |
https://doi.org/10.1111/j.1365-3091.2011.01296.x |
long_lat |
ENVELOPE(-109.468,-109.468,62.684,62.684) ENVELOPE(-55.731,-55.731,52.467,52.467) |
geographic |
Antarctic The Antarctic Patagonia Argentina New Lake Level Point |
geographic_facet |
Antarctic The Antarctic Patagonia Argentina New Lake Level Point |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Sedimentology--Sedimentology--journals:2630--0037-0746 eawag:6877 journal id: journals:2630 issn: 0037-0746 ut: 000301718300018 local: 15227 scopus: 2-s2.0-84858705630 doi:10.1111/j.1365-3091.2011.01296.x |
op_doi |
https://doi.org/10.1111/j.1365-3091.2011.01296.x |
container_title |
Sedimentology |
container_volume |
59 |
container_issue |
3 |
container_start_page |
1087 |
op_container_end_page |
1100 |
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1766286432840712192 |