DOI: 10.1016/j.quascirev.2018.09.025
Scopus记录号: 2-s2.0-85054437655
论文题名: Asynchronous glacier dynamics during the Antarctic Cold Reversal in central Patagonia
作者: Davies B.J. ; Thorndycraft V.R. ; Fabel D. ; Martin J.R.V.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 200 起始页码: 287
结束页码: 312
语种: 英语
Scopus关键词: Landforms
; Antarctic cold reversals
; Bertrand
; Central Patagonia
; Cosmogenic nuclide exposure ages
; Glacier dynamics
; Palaeoshorelines
; Pinning points
; Ice
英文摘要: We present 14 new 10Be cosmogenic nuclide exposure ages quantifying asynchronous readvances during the Antarctic Cold Reversal from glaciers in the Baker Valley region of central Patagonia. We constrain glacier and ice-dammed palaeolake dynamics using a landsystems approach, concentrating on outlet glaciers from the eastern Northern Patagonian Icefield (NPI) and Monte San Lorenzo (MSL). Soler Glacier (NPI) produced lateral moraines above Lago Bertrand from 15.1 ± 0.7 to 14.0 ± 0.6 ka, when it dammed the drainage of Lago General Carrera/Buenos Aires through Río Baker at a bedrock pinning point. At this time, Soler Glacier terminated into the 400 m “Deseado” level of the ice-dammed palaeolake. Later, Calluqueo Glacier (MSL) deposited subaerial and subaqueous moraines in the Salto Valley near Cochrane at 13.0 ± 0.6 ka. These moraines were deposited in an ice-dammed palaeolake unified through the Baker Valley (Lago Chalenko; 350 m asl). The Salto Valley glaciolacustrine landsystem includes subaqueous morainal banks, ice-scoured bedrock, glacial diamicton plastered onto valley sides, perched delta terraces, kame terraces, ice-contact fans, palaeoshorelines and subaerial push and lateral moraines. Boulders from the subaqueous Salto Moraine became exposed at 12.1 ± 0.6 years, indicating palaeolake drainage. These data show an asynchronous advance of outlet glaciers from the Northern Patagonian Icefield and Monte San Lorenzo during the Antarctic Cold Reversal. These advances occurred during a period of regional climatic cooling, but differential moraine extent and timing of advance was controlled by topography and calving processes. © 2018 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112016
Appears in Collections: 气候减缓与适应
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作者单位: Centre for Quaternary Research, Department of Geography, Royal Holloway University of London, Egham, Surrey, TW20 0EX, United Kingdom; SUERC AMS Laboratory, Scottish Universities Environmental Research Centre (SUERC), University of Glasgow, Rankine Avenue, East Kilbride, G75 0QF, United Kingdom
Recommended Citation:
Davies B.J.,Thorndycraft V.R.,Fabel D.,et al. Asynchronous glacier dynamics during the Antarctic Cold Reversal in central Patagonia[J]. Quaternary Science Reviews,2018-01-01,200