Timing of the Northern Prince Gustav Ice Stream Retreat and the Deglaciation of Northern James Ross Island, Antarctic Peninsula
Quaternary Research 82 (2014) 441–449 Contents lists available at ScienceDirect Quaternary Research journal homepage: www.elsevier.com/locate/yqres Timing of the Northern Prince Gustav Ice Stream retreat and the deglaciation of northern James Ross Island, Antarctic Peninsula during the last glacial–interglacial transition Daniel Nývlt a,b,⁎, Régis Braucher c,ZbyněkEngeld,e,Bedřich Mlčoch e, ASTER Team c,1 a Department of Geography, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czechia b Czech Geological Survey, Brno branch, Leitnerova 22, 658 69 Brno, Czechia c Aix-Marseille Université, CNRS-IRD-Collège de France, UM 34 CEREGE, Technopôle de l'Arbois, BP80, 13545 Aix-en-Provence, France d Faculty of Science, Charles University in Prague, Albertov 6, 128 43 Praha, Czechia e Czech Geological Survey, Klárov 3, 118 21 Praha, Czechia article info abstract Article history: The Northern Prince Gustav Ice Stream located in Prince Gustav Channel, drained the northeastern portion of the Received 13 September 2013 Antarctic Peninsula Ice Sheet during the last glacial maximum. Here we present a chronology of its retreat based Available online 27 June 2014 on in situ produced cosmogenic 10Be from erratic boulders at Cape Lachman, northern James Ross Island. Schmidt hammer testing was adopted to assess the weathering state of erratic boulders in order to better interpret excess Keywords: cosmogenic 10Be from cumulative periods of pre-exposure or earlier release from the glacier. The weighted mean Northern Prince Gustav Ice Stream exposure age of five boulders based on Schmidt hammer data is 12.9 ± 1.2 ka representing the beginning of the Antarctic Peninsula Ice Sheet b Be-10 exposure dating deglaciation of lower-lying areas ( 60 m a.s.l.) of the northern James Ross Island, when Northern Prince Gustav Schmidt hammer testing Ice Stream split from the remaining James Ross Island ice cover.
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