DOI: 10.1016/j.quascirev.2018.06.028
Scopus记录号: 2-s2.0-85049459237
论文题名: Giant landslides in the foreland of the Patagonian Ice Sheet
作者: Pánek T. ; Korup O. ; Lenart J. ; Hradecký J. ; Břežný M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 194 起始页码: 39
结束页码: 54
语种: 英语
英文关键词: Geomorphology
; Glacial lake
; Glacier foreland
; Landslide
; Paleogeography
; Patagonian Ice Sheet
; Quaternary
; Relative dating
; South America
Scopus关键词: Deposits
; Geomorphology
; Glacial geology
; Glaciers
; Ice
; Lakes
; Landforms
; Glacial lakes
; Ice sheet
; Paleogeography
; Quaternary
; Relative dating
; South America
; Landslides
; bedrock
; dating method
; foreland basin
; geomorphology
; glacial deposit
; glaciation
; ice sheet
; lake level
; landslide
; Last Glacial Maximum
; moraine
; outwash
; Quaternary
; reconstruction
; slope failure
; Lake General Carrera
; South America
英文摘要: 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. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112102
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physical Geography and Geoecology, Faculty of Science, University of Ostrava, Chittussiho 10, Ostrava, 710 00, Czech Republic; Institute of Earth and Environmental Sciences, University of Potsdam, Karl-Liebknecht-Str. 24, Golm, D-14476, Germany
Recommended Citation:
Pánek T.,Korup O.,Lenart J.,et al. Giant landslides in the foreland of the Patagonian Ice Sheet[J]. Quaternary Science Reviews,2018-01-01,194