DOI: 10.1016/j.quascirev.2018.10.036
Scopus记录号: 2-s2.0-85056698026
论文题名: Glacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet
作者: Thorndycraft V.R. ; Bendle J.M. ; Benito G. ; Davies B.J. ; Sancho C. ; Palmer A.P. ; Fabel D. ; Medialdea A. ; Martin J.R.V.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2019
卷: 203 起始页码: 102
结束页码: 127
语种: 英语
英文关键词: Antarctic Cold Reversal
; Bayesian age modelling
; Cosmogenic isotopes
; Glacial lake outburst floods (GLOFs)
; Palaeogeography
; Palaeohydrology
; Palaeolake shorelines
; Pleistocene
; South America
Scopus关键词: Catchments
; Floods
; Geochronology
; Glacial geology
; Glaciers
; Lakes
; Landforms
; Regional planning
; Water
; Age modelling
; Antarctic cold reversals
; Cosmogenic isotopes
; Glacial lake outburst flood (GLOFs)
; Palaeogeography
; Palaeohydrology
; Palaeolake shorelines
; Pleistocene
; South America
; Ice
; Bayesian analysis
; deglaciation
; drainage
; flood
; geomorphological mapping
; glacial lake
; ice sheet
; isotopic analysis
; lake evolution
; moraine
; outburst
; paleoenvironment
; paleogeography
; paleohydrology
; Pleistocene
; shoreline change
; Atlantic Ocean
; Pacific Ocean
; Patagonia
英文摘要: Modelling experiments of drainage events from proglacial lakes of the Río Baker catchment (central Patagonia, 46–48 ⁰S) indicate that Atlantic-Pacific drainage reversals may have caused freshwater forcing of regional climate. However, much of the region remains unmapped in detail and available geochronological data is equivocal, leading to multiple published palaeolake evolution models. We evaluate these models through new geomorphological mapping from the Baker valley; cosmogenic dating of moraine boulders that demonstrates an Antarctic Cold Reversal ice readvance that blocked drainage through the Río Baker; an altitudinal-based review of published geochronology; and regional analysis of shoreline glacio-isostasy and palaeolake levels. We use these datasets to present a new regional palaeolake evolution model underpinned by Bayesian age modelling. We demonstrate that 103 km3 of freshwater was released to the Pacific over at least 6 drainage events from before 15.3–15.0 cal yr BP to the early Holocene. The final stages of lake drainage involved catastrophic flooding along the Baker valley, evidenced by high magnitude flood landforms such as boulder bars, likely caused by failure of large valley floor moraine dams. We place these drainage events in the context of Late Quaternary meltwater pathways associated with advance/retreat of the Patagonian Ice Sheet and early human occupation across the region. Although broad patterns of ice retreat and lake formation may be similar across Patagonia, driven by Southern Hemisphere palaeoclimate, regional topographic settings likely resulted in spatial and temporal heterogeneity of Atlantic-Pacific drainage reorganisation across southernmost South America. © 2018 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117442
Appears in Collections: 气候变化与战略
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Recommended Citation:
Thorndycraft V.R.,Bendle J.M.,Benito G.,et al. Glacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet[J]. Quaternary Science Reviews,2019-01-01,203