Magnitude, geomorphologic response and climate links of lake level oscillations at Laguna Potrok Aike, Patagonian steppe (Argentina)
Laguna Potrok Aike is a large maar lake located in the semiarid steppe of southern Patagonia known for its Lateglacial and Holocene lake level fluctuations. Based on sedimentary, seismic and geomorphological evidences, the lake level curve is updated and extended into the Last Glacial period and the...
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2013
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ftdtupubl:oai:pure.atira.dk:publications/bc18c156-828a-4f10-a097-6fe7647228e5 2024-01-14T10:07:36+01:00 Magnitude, geomorphologic response and climate links of lake level oscillations at Laguna Potrok Aike, Patagonian steppe (Argentina) Kliem, P. Buylaert, Jan-Pieter Hahn, A. Mayr, C. Murray, A.S. Ohlendorf, C. Veres, D. Wastegård, S. Zolitschka, B. 2013 https://orbit.dtu.dk/en/publications/bc18c156-828a-4f10-a097-6fe7647228e5 https://doi.org/10.1016/j.quascirev.2012.08.023 eng eng https://orbit.dtu.dk/en/publications/bc18c156-828a-4f10-a097-6fe7647228e5 info:eu-repo/semantics/closedAccess Kliem , P , Buylaert , J-P , Hahn , A , Mayr , C , Murray , A S , Ohlendorf , C , Veres , D , Wastegård , S & Zolitschka , B 2013 , ' Magnitude, geomorphologic response and climate links of lake level oscillations at Laguna Potrok Aike, Patagonian steppe (Argentina) ' , Quaternary Science Reviews , vol. 71 , pp. 131-146 . https://doi.org/10.1016/j.quascirev.2012.08.023 ICDP-project PASADO Lake terraces Southern Hemispheric Westerlies Permafrost Holocene Glacial article 2013 ftdtupubl https://doi.org/10.1016/j.quascirev.2012.08.023 2023-12-20T23:58:36Z Laguna Potrok Aike is a large maar lake located in the semiarid steppe of southern Patagonia known for its Lateglacial and Holocene lake level fluctuations. Based on sedimentary, seismic and geomorphological evidences, the lake level curve is updated and extended into the Last Glacial period and the geomorphological development of the lake basin and its catchment area is interpreted.Abrasion and lake level oscillations since at least ∼50 ka caused concentric erosion of the surrounding soft rocks of the Miocene Santa Cruz Formation and expanded the basin diameter by approximately 1 km. A high lake level and overflow conditions of the lake were dated by luminescence methods and tephra correlation to the early Lateglacial as well as to ∼45 ka. The lowest lake level of record occurred during the mid-Holocene. A further lake level drop was probably prevented by groundwater supply. This low lake level eroded a distinct terrace into lacustrine sediments. Collapse of these terraces probably caused mass movement deposits in the profundal zone of the lake. After the mid-Holocene lake level low stand a general and successive transgression occurred until the Little Ice Age maximum; i.e. ca 40 m above the local groundwater table. Frequent lake level oscillations caused deflation of emerged terraces only along the eastern shoreline due to prevailing westerly winds. Preservation of eolian deposits might be linked to relatively moist climate conditions during the past 2.5 ka.Precisely dated lake level reconstructions in the rain-shadow of the Andes document high Last Glacial and low Holocene lake levels that could suggest increased precipitation during the Last Glacial period. As permafrost in semiarid Patagonia is documented and dated to the Last Glacial period we argue that the frozen ground might have increased surficial runoff from the catchment and thus influenced the water balance of the lake. This is important for investigating the glacial to Holocene latitudinal shift and/or strengthening of the Southern Hemispheric ... Article in Journal/Newspaper Ice permafrost Technical University of Denmark: DTU Orbit Patagonia Argentina Low Lake ENVELOPE(142.677,142.677,-66.993,-66.993) Quaternary Science Reviews 71 131 146 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
ICDP-project PASADO Lake terraces Southern Hemispheric Westerlies Permafrost Holocene Glacial |
spellingShingle |
ICDP-project PASADO Lake terraces Southern Hemispheric Westerlies Permafrost Holocene Glacial Kliem, P. Buylaert, Jan-Pieter Hahn, A. Mayr, C. Murray, A.S. Ohlendorf, C. Veres, D. Wastegård, S. Zolitschka, B. Magnitude, geomorphologic response and climate links of lake level oscillations at Laguna Potrok Aike, Patagonian steppe (Argentina) |
topic_facet |
ICDP-project PASADO Lake terraces Southern Hemispheric Westerlies Permafrost Holocene Glacial |
description |
Laguna Potrok Aike is a large maar lake located in the semiarid steppe of southern Patagonia known for its Lateglacial and Holocene lake level fluctuations. Based on sedimentary, seismic and geomorphological evidences, the lake level curve is updated and extended into the Last Glacial period and the geomorphological development of the lake basin and its catchment area is interpreted.Abrasion and lake level oscillations since at least ∼50 ka caused concentric erosion of the surrounding soft rocks of the Miocene Santa Cruz Formation and expanded the basin diameter by approximately 1 km. A high lake level and overflow conditions of the lake were dated by luminescence methods and tephra correlation to the early Lateglacial as well as to ∼45 ka. The lowest lake level of record occurred during the mid-Holocene. A further lake level drop was probably prevented by groundwater supply. This low lake level eroded a distinct terrace into lacustrine sediments. Collapse of these terraces probably caused mass movement deposits in the profundal zone of the lake. After the mid-Holocene lake level low stand a general and successive transgression occurred until the Little Ice Age maximum; i.e. ca 40 m above the local groundwater table. Frequent lake level oscillations caused deflation of emerged terraces only along the eastern shoreline due to prevailing westerly winds. Preservation of eolian deposits might be linked to relatively moist climate conditions during the past 2.5 ka.Precisely dated lake level reconstructions in the rain-shadow of the Andes document high Last Glacial and low Holocene lake levels that could suggest increased precipitation during the Last Glacial period. As permafrost in semiarid Patagonia is documented and dated to the Last Glacial period we argue that the frozen ground might have increased surficial runoff from the catchment and thus influenced the water balance of the lake. This is important for investigating the glacial to Holocene latitudinal shift and/or strengthening of the Southern Hemispheric ... |
format |
Article in Journal/Newspaper |
author |
Kliem, P. Buylaert, Jan-Pieter Hahn, A. Mayr, C. Murray, A.S. Ohlendorf, C. Veres, D. Wastegård, S. Zolitschka, B. |
author_facet |
Kliem, P. Buylaert, Jan-Pieter Hahn, A. Mayr, C. Murray, A.S. Ohlendorf, C. Veres, D. Wastegård, S. Zolitschka, B. |
author_sort |
Kliem, P. |
title |
Magnitude, geomorphologic response and climate links of lake level oscillations at Laguna Potrok Aike, Patagonian steppe (Argentina) |
title_short |
Magnitude, geomorphologic response and climate links of lake level oscillations at Laguna Potrok Aike, Patagonian steppe (Argentina) |
title_full |
Magnitude, geomorphologic response and climate links of lake level oscillations at Laguna Potrok Aike, Patagonian steppe (Argentina) |
title_fullStr |
Magnitude, geomorphologic response and climate links of lake level oscillations at Laguna Potrok Aike, Patagonian steppe (Argentina) |
title_full_unstemmed |
Magnitude, geomorphologic response and climate links of lake level oscillations at Laguna Potrok Aike, Patagonian steppe (Argentina) |
title_sort |
magnitude, geomorphologic response and climate links of lake level oscillations at laguna potrok aike, patagonian steppe (argentina) |
publishDate |
2013 |
url |
https://orbit.dtu.dk/en/publications/bc18c156-828a-4f10-a097-6fe7647228e5 https://doi.org/10.1016/j.quascirev.2012.08.023 |
long_lat |
ENVELOPE(142.677,142.677,-66.993,-66.993) |
geographic |
Patagonia Argentina Low Lake |
geographic_facet |
Patagonia Argentina Low Lake |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
Kliem , P , Buylaert , J-P , Hahn , A , Mayr , C , Murray , A S , Ohlendorf , C , Veres , D , Wastegård , S & Zolitschka , B 2013 , ' Magnitude, geomorphologic response and climate links of lake level oscillations at Laguna Potrok Aike, Patagonian steppe (Argentina) ' , Quaternary Science Reviews , vol. 71 , pp. 131-146 . https://doi.org/10.1016/j.quascirev.2012.08.023 |
op_relation |
https://orbit.dtu.dk/en/publications/bc18c156-828a-4f10-a097-6fe7647228e5 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2012.08.023 |
container_title |
Quaternary Science Reviews |
container_volume |
71 |
container_start_page |
131 |
op_container_end_page |
146 |
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1788061983621251072 |