Antarctic Science

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Antarctic Science (2009), 21:373-382 Cambridge University Press
Copyright © Antarctic Science Ltd 2009
doi:10.1017/S0954102009002028

Earth Sciences

Deglaciation and weathering of Larsemann Hills, East Antarctica


Kevin Kiernana1 c1, Damian B. Gorea2, David Finka3, Duanne A. Whitea2, Anne McConnella1 and Ingvar A. Sigurdssona4

a1 School of Geography & Environmental Studies, University of Tasmania, Private Bag 78, TAS 7001, Australia
a2 Department of Environment & Geography, Macquarie University, NSW 2109, Australia
a3 Environment Division, ANSTO, Menai, NSW 2234, Australia
a4 South Iceland Nature Centre, Strandvegur 50, 900 Vestmannaeyjar, Iceland
Article author query
kiernan k [PubMed]  [Google Scholar]
gore db [PubMed]  [Google Scholar]
fink d [PubMed]  [Google Scholar]
white da [PubMed]  [Google Scholar]
mcconnell a [PubMed]  [Google Scholar]
sigurdsson ia [PubMed]  [Google Scholar]

Abstract

In situ cosmogenic 10Be exposure dating, radiocarbon determinations, salt and sediment geochemistry, and rock weathering observations indicate that parts of Larsemann Hills, East Antarctica have been subaerially exposed throughout much of the last glacial cycle, with the last glaciation occurring prior to 100 ka bp. Salt-enhanced subaerial weathering, coupled with a paucity of glacial erratics, made exposure age dating challenging. Rapid subaerial surface lowering in some places means that some exposure ages may underestimate the true age of deglaciation. Despite this uncertainty, the data are consistent with the absence of overriding by a thick ice sheet during the Last Glacial Maximum xs223C20–18 ka bp.

(Received September 03 2008)

(Accepted February 09 2009)

Key wordsBroknes; cosmogenic nuclide exposure age; mumiyo; salt geochemistry; Stornes

Correspondence:

c1 Kevin.Kiernan@utas.edu.au


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