Show simple item record N. F. en_US Krister N. en_US Bradley W. en_US Hernan en_US Helena en_US Dylan H. en_US 2011-05-03T09:38:53Z 2011-05-03T09:38:53Z 2011-05 en_US
dc.identifier en_US
dc.identifier.citation Glasser , N F , Jansson , K N , Goodfellow , B W , De Angelis , H , Rodnight , H & Rood , D H 2011 , ' Cosmogenic nuclide exposure ages for moraines in the Lago San Martin Valley, Argentina ' Quaternary Research , vol 75 , no. 3 , pp. 636-646 . , 10.1016/j.yqres.2010.11.005 , 10.1016/j.yqres.2010.11.005 en_US
dc.identifier.other PURE: 159170 en_US
dc.identifier.other dspace: 2160/6699 en_US
dc.description.abstract At several times during the Quaternary, a major eastward-flowing outlet glacier of the former Patagonian Ice Sheet occupied the Lago San Martin Valley in Argentina (49°S, 72°W). We present a glacial chronology for the valley based on geomorphological mapping and cosmogenic nuclide (10Be) exposure ages (n = 10) of boulders on moraines and lake shorelines. There are five prominent moraine belts in the Lago San Martin Valley, associated with extensive sandar (glaciofluvial outwash plains) and former lake shorelines. Cosmogenic nuclide exposure ages for boulders on these moraines indicate that they formed at 14.3 ± 1.7 ka, 22.4 ± 2.3 ka, 34.4 ± 3.4 ka to 37.6 ± 3.4 ka (and possibly 60 ± 3.5 ka), and 99 ± 11 ka (1σ). These dated glacier advances differ from published chronologies from the Lago San Martin Valley based on 14C age determinations from organic sediments and molluscs in meltwater channels directly in front of moraines or in kettleholes within end moraine ridges. The moraine boulder ages also point to possible pre-LGM glacial advances during the last glacial cycle and a key observation from our data is that the LGM glaciers were probably less extensive in the Lago San Martin Valley than previously thought. en_US
dc.format.extent 11 en_US
dc.relation.ispartof Quaternary Research en_US
dc.title Cosmogenic nuclide exposure ages for moraines in the Lago San Martin Valley, Argentina en_US
dc.contributor.pbl Institute of Geography & Earth Sciences en_US
dc.contributor.pbl Centre for Glaciology en_US

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