Cosmogenic nuclide exposure ages for moraines in the Lago San Martin Valley, Argentina

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dc.contributor.author Glasser, N. F.
dc.contributor.author Jansson, Krister N.
dc.contributor.author Goodfellow, Bradley W.
dc.contributor.author De Angelis, Hernan
dc.contributor.author Rodnight, Helena
dc.contributor.author Rood, Dylan H.
dc.date.accessioned 2011-05-03T09:38:53Z
dc.date.available 2011-05-03T09:38:53Z
dc.date.issued 2011-05
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
dc.identifier.other PURE: 159170
dc.identifier.other dspace: 2160/6699
dc.identifier.uri http://hdl.handle.net/2160/6699
dc.description Neil F. Glasser, Krister N. Jansson, Bradley W. Goodfellow, Hernan de Angelis, Helena Rodnight, Dylan H. Rood (2011). Cosmogenic nuclide exposure ages for moraines in the Lago San Martin Valley, Argentina. Quaternary Research, 75, 3, 636-646 en
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
dc.format.extent 11 en
dc.language.iso eng
dc.relation.ispartof Quaternary Research en
dc.title Cosmogenic nuclide exposure ages for moraines in the Lago San Martin Valley, Argentina en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1016/j.yqres.2010.11.005
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.contributor.institution Centre for Glaciology en
dc.description.status Peer reviewed en


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