Asynchronous glacier dynamics during the Antarctic Cold Reversal in central Patagonia. / Davies, Bethan; Thorndycraft, Varyl; Fabel, Derek; Martin, Julian.

In: Quaternary Science Reviews, Vol. 200, 15.11.2018, p. 287-312.

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Asynchronous glacier dynamics during the Antarctic Cold Reversal in central Patagonia. / Davies, Bethan; Thorndycraft, Varyl; Fabel, Derek; Martin, Julian.

In: Quaternary Science Reviews, Vol. 200, 15.11.2018, p. 287-312.

Research output: Contribution to journalArticle

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@article{8f04e4b1d9464957a9444ea409d2a7be,
title = "Asynchronous glacier dynamics during the Antarctic Cold Reversal in central Patagonia",
abstract = "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 and Monte San Lorenzo. Soler Glacier (Northern Patagonian Icefield) 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 R{\'i}o 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 (Monte San Lorenzo) deposited subaerial and subaqueous moraines in an ice-dammed palaeolake (Lago Chalenko; 350 m asl) in the Salto Valley near Cochrane at 13.0±0.6 ka. 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 NPI 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.",
author = "Bethan Davies and Varyl Thorndycraft and Derek Fabel and Julian Martin",
year = "2018",
month = "11",
day = "15",
doi = "10.1016/j.quascirev.2018.09.025",
language = "English",
volume = "200",
pages = "287--312",
journal = "Quaternary Science Reviews",
issn = "0277-3791",
publisher = "Elsevier Limited",

}

RIS

TY - JOUR

T1 - Asynchronous glacier dynamics during the Antarctic Cold Reversal in central Patagonia

AU - Davies, Bethan

AU - Thorndycraft, Varyl

AU - Fabel, Derek

AU - Martin, Julian

PY - 2018/11/15

Y1 - 2018/11/15

N2 - 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 and Monte San Lorenzo. Soler Glacier (Northern Patagonian Icefield) 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 (Monte San Lorenzo) deposited subaerial and subaqueous moraines in an ice-dammed palaeolake (Lago Chalenko; 350 m asl) in the Salto Valley near Cochrane at 13.0±0.6 ka. 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 NPI 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.

AB - 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 and Monte San Lorenzo. Soler Glacier (Northern Patagonian Icefield) 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 (Monte San Lorenzo) deposited subaerial and subaqueous moraines in an ice-dammed palaeolake (Lago Chalenko; 350 m asl) in the Salto Valley near Cochrane at 13.0±0.6 ka. 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 NPI 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.

U2 - 10.1016/j.quascirev.2018.09.025

DO - 10.1016/j.quascirev.2018.09.025

M3 - Article

VL - 200

SP - 287

EP - 312

JO - Quaternary Science Reviews

JF - Quaternary Science Reviews

SN - 0277-3791

ER -