干旱区生态环境知识资源中心(Arid): Complex causes of landslides after ice sheet retreat: Post-LGM mass movements in the Northern Patagonian Icefield region

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DOI	10.1016/j.scitotenv.2020.143684
	Complex causes of landslides after ice sheet retreat: Post-LGM mass movements in the Northern Patagonian Icefield region
	Panek, Tomas; Brezny, Michal; Kilnar, Jakub; Winocur, Diego
通讯作者	Panek, T (corresponding author), Univ Ostrava, Fac Sci, Dept Phys Geog & Geoecol, Chittussiho 10, Ostrava 71000, Czech Republic.
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2021
卷号	758
英文摘要	Although the dynamics of individual rock-slope failures above recently shrinking glaciers have received increasing study, less is known about the spatial distribution of landslides in paraglacial settings. Here, we present a landslide inventory for large deglaciated area (similar to 100,000 km(2)) situated within the Last Glacial Maximum (LGM) limits of the Northern Patagonian Icefield (NPI). Using satellite images and the TanDEM-X digital elevation model, we mapped a total of 15,543 landslides, among which 1006 are deep-seated landslides (DSLs) with area >= 0.01 km(2). The distribution of DSLs is highly asymmetric in a W-E transect of the NPI region, with pronounced clustering along the semi-arid eastern front of the Patagonian Andes. The most strongly affected domain is volcanic tablelands overlying weak Miocene sedimentary rocks, but DSLs tend to also cluster along recently deglaciated (i.e. since the end of the 19th century) eastern margin of the NPI. Compared with other high mountain regions, alpine valleys of the Patagonian Andes are affected by DSLs only in <1% of their area, an order of magnitude lower than in other reported deglaciated mountains. The modest incidence of DSLs in the Patagonian Andes is due to dominance of hard granitoid rocks and relatively weak historical seismic activity. We conclude that 1) geological conditions control the distribution of DSLs and their types in the NPI region; 2) paraglacial effects play secondary (although locally important) roles in the origin of DSLs; 3) local clusters of large DSLs originate due to specifics of the post-LGMlandscape evolution, involving drawdowns of glacial lakes and incision of rivers into the unconsolidated deposits; and 4) increased abundance of landslides above the recently shrinking margin of the NPI results fromthe repeated Holocene fluctuations of glacier snouts around the Little Ice Age (LIA) glacier limits and the spatial coincidence of glacial debuttressing effects with the presence of active faults. (C) 2020 Elsevier B.V. All rights reserved.
英文关键词	Deglaciation Landslides Mapping Northern Patagonian Icefield
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000605623800088
WOS关键词	LAGO BUENOS-AIRES ; GRAVITATIONAL SLOPE DEFORMATIONS ; ROCK AVALANCHES ; SPATIAL-DISTRIBUTION ; GIANT LANDSLIDES ; CLIMATE-CHANGE ; SOUTH-AMERICA ; TANDEM-X ; AGE ; DEGLACIATION
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/348181
作者单位	[Panek, Tomas; Brezny, Michal; Kilnar, Jakub] Univ Ostrava, Fac Sci, Dept Phys Geog & Geoecol, Chittussiho 10, Ostrava 71000, Czech Republic; [Winocur, Diego] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Ciencias Geol, Intendente Guiraldes 2160,C1428EGA, Caba, Argentina; [Winocur, Diego] UBA, Inst Estudios Andinos IDEAN, CONICET, Buenos Aires, DF, Argentina
推荐引用方式 GB/T 7714	Panek, Tomas,Brezny, Michal,Kilnar, Jakub,et al. Complex causes of landslides after ice sheet retreat: Post-LGM mass movements in the Northern Patagonian Icefield region[J],2021,758.
APA	Panek, Tomas,Brezny, Michal,Kilnar, Jakub,&Winocur, Diego.(2021).Complex causes of landslides after ice sheet retreat: Post-LGM mass movements in the Northern Patagonian Icefield region.SCIENCE OF THE TOTAL ENVIRONMENT,758.
MLA	Panek, Tomas,et al."Complex causes of landslides after ice sheet retreat: Post-LGM mass movements in the Northern Patagonian Icefield region".SCIENCE OF THE TOTAL ENVIRONMENT 758(2021).