Giant landslides in the foreland of the Patagonian Ice Sheet
Quaternary glaciations have repeatedly shaped large tracts of the Andean foreland. Its spectacular large glacial lakes, staircases of moraine ridges, and extensive outwash plains have inspired generations of scientists to reconstruct the processes, magnitude, and timing of ice build-up and decay at...
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ftubpotsdam:oai:kobv.de-opus4-uni-potsdam:52253 2023-12-17T10:31:46+01:00 Giant landslides in the foreland of the Patagonian Ice Sheet Panek, Tomas Korup, Oliver (Professor) Lenart, Jan Hradecky, Jan Brezny, Michal 2018-07-05 https://publishup.uni-potsdam.de/frontdoor/index/index/docId/52253 https://doi.org/10.1016/j.quascirev.2018.06.028 eng eng https://publishup.uni-potsdam.de/frontdoor/index/index/docId/52253 https://doi.org/10.1016/j.quascirev.2018.06.028 info:eu-repo/semantics/closedAccess ddc:550 Institut für Geowissenschaften article doc-type:article 2018 ftubpotsdam https://doi.org/10.1016/j.quascirev.2018.06.028 2023-11-19T23:35:15Z Quaternary glaciations have repeatedly shaped large tracts of the Andean foreland. Its spectacular large glacial lakes, staircases of moraine ridges, and extensive outwash plains have inspired generations of scientists to reconstruct the processes, magnitude, and timing of ice build-up and decay at the mountain front. Surprisingly few of these studies noticed many dozens of giant (≥108 m3) mass-wasting deposits in the foreland. We report some of the world's largest terrestrial landslides in the eastern piedmont of the Patagonian Ice Sheet (PIS) along the traces of the former Lago Buenos Aires and Lago Puyerredón glacier lobes and lakes. More than 283 large rotational slides and lateral spreads followed by debris slides, earthflows, rotational and translational rockslides, complex slides and few large rock avalanches detached some 164 ± 56 km3 of material from the slopes of volcanic mesetas, lake-bounding moraines, and river-gorge walls. Many of these landslide deposits intersect with well-dated moraine ridges or former glacial-lake shorelines, and offer opportunities for relative dating of slope failure. We estimate that >60% of the landslide volume (∼96 km3) detached after the Last Glacial Maximum (LGM). Giant slope failures cross-cutting shorelines of a large Late Glacial to Early Holocene lake (“glacial lake PIS”) likely occurred during successive lake-level drop between ∼11.5 and 8 ka, and some of them are the largest hitherto documented landslides in moraines. We conclude that 1) large portions of terminal moraines can fail catastrophically several thousand years after emplacement; 2) slopes formed by weak bedrock or unconsolidated glacial deposits bordering glacial lakes can release extremely large landslides; and 3) landslides still occur in the piedmont, particularly along postglacial gorges cut in response to falling lake levels. Article in Journal/Newspaper Ice Sheet University of Potsdam: publish.UP Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Quaternary Science Reviews 194 39 54 |
institution |
Open Polar |
collection |
University of Potsdam: publish.UP |
op_collection_id |
ftubpotsdam |
language |
English |
topic |
ddc:550 Institut für Geowissenschaften |
spellingShingle |
ddc:550 Institut für Geowissenschaften Panek, Tomas Korup, Oliver (Professor) Lenart, Jan Hradecky, Jan Brezny, Michal Giant landslides in the foreland of the Patagonian Ice Sheet |
topic_facet |
ddc:550 Institut für Geowissenschaften |
description |
Quaternary glaciations have repeatedly shaped large tracts of the Andean foreland. Its spectacular large glacial lakes, staircases of moraine ridges, and extensive outwash plains have inspired generations of scientists to reconstruct the processes, magnitude, and timing of ice build-up and decay at the mountain front. Surprisingly few of these studies noticed many dozens of giant (≥108 m3) mass-wasting deposits in the foreland. We report some of the world's largest terrestrial landslides in the eastern piedmont of the Patagonian Ice Sheet (PIS) along the traces of the former Lago Buenos Aires and Lago Puyerredón glacier lobes and lakes. More than 283 large rotational slides and lateral spreads followed by debris slides, earthflows, rotational and translational rockslides, complex slides and few large rock avalanches detached some 164 ± 56 km3 of material from the slopes of volcanic mesetas, lake-bounding moraines, and river-gorge walls. Many of these landslide deposits intersect with well-dated moraine ridges or former glacial-lake shorelines, and offer opportunities for relative dating of slope failure. We estimate that >60% of the landslide volume (∼96 km3) detached after the Last Glacial Maximum (LGM). Giant slope failures cross-cutting shorelines of a large Late Glacial to Early Holocene lake (“glacial lake PIS”) likely occurred during successive lake-level drop between ∼11.5 and 8 ka, and some of them are the largest hitherto documented landslides in moraines. We conclude that 1) large portions of terminal moraines can fail catastrophically several thousand years after emplacement; 2) slopes formed by weak bedrock or unconsolidated glacial deposits bordering glacial lakes can release extremely large landslides; and 3) landslides still occur in the piedmont, particularly along postglacial gorges cut in response to falling lake levels. |
format |
Article in Journal/Newspaper |
author |
Panek, Tomas Korup, Oliver (Professor) Lenart, Jan Hradecky, Jan Brezny, Michal |
author_facet |
Panek, Tomas Korup, Oliver (Professor) Lenart, Jan Hradecky, Jan Brezny, Michal |
author_sort |
Panek, Tomas |
title |
Giant landslides in the foreland of the Patagonian Ice Sheet |
title_short |
Giant landslides in the foreland of the Patagonian Ice Sheet |
title_full |
Giant landslides in the foreland of the Patagonian Ice Sheet |
title_fullStr |
Giant landslides in the foreland of the Patagonian Ice Sheet |
title_full_unstemmed |
Giant landslides in the foreland of the Patagonian Ice Sheet |
title_sort |
giant landslides in the foreland of the patagonian ice sheet |
publishDate |
2018 |
url |
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/52253 https://doi.org/10.1016/j.quascirev.2018.06.028 |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) |
geographic |
Glacial Lake |
geographic_facet |
Glacial Lake |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/52253 https://doi.org/10.1016/j.quascirev.2018.06.028 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2018.06.028 |
container_title |
Quaternary Science Reviews |
container_volume |
194 |
container_start_page |
39 |
op_container_end_page |
54 |
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1785585156854120448 |