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Dating late Cenozoic erosional surfaces in Victoria Land, Antarctica, with cosmogenic neon in pyroxenes

Published online by Cambridge University Press:  27 November 2007

P. Oberholzer ,
C. Baroni ,
M.C. Salvatore ,
H. Baur  and
R. Wieler
P. Oberholzer*
Affiliation:
Institute of Isotope Geology and Mineral Resources, ETH Zürich, Clausiusstrasse 25, 8092 Zürich, Switzerland
C. Baroni
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, 56126 Pisa, Italy
M.C. Salvatore
Affiliation:
Dipartimento di Scienze della Terra, Università di Roma “La Sapienza”, Piazzale A. Moro 5, 00185 Roma, Italy
H. Baur
Affiliation:
Institute of Isotope Geology and Mineral Resources, ETH Zürich, Clausiusstrasse 25, 8092 Zürich, Switzerland
R. Wieler
Affiliation:
Institute of Isotope Geology and Mineral Resources, ETH Zürich, Clausiusstrasse 25, 8092 Zürich, Switzerland
*
*current address: Baugeologie und Geo-Bau-Labor Chur, Bolettastrasse 1, 7000 Chur, Switzerland[email protected]
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Abstract

We present 21Ne exposure ages of erosional glaciogenic rock surfaces on nunataks in northern Victoria Land, Antarctica: i) in the Prince Albert Mountains and ii) near Mesa Range. These nunataks are located directly at the margin of the polar plateau and therefore provide an immediate record of ice volume changes of the East Antarctic Ice Sheet, not biased by ice shelf grounding or narrow valley sections downstream the outlet glaciers. The sampling locations overlook the present ice surface by less than 200 m, but were last covered by ice 3.5 Ma bp (minimum age, not corrected for erosion). This strongly indicates that the ice sheet has not been substantially thicker than today since at least the early Pliocene, which supports the hypothesis of a stable East Antarctic Ice Sheet. First absolute ages are reported for the alpine topography above the erosive trimline that typically marks the upper limit of glacial activity in northern Victoria Land. Unexpectedly low nuclide concentrations suggest that erosion rates on the alpine topography are considerably higher due to the steep slopes than those affecting flat erosional surfaces carrying Antarctic tors.

Keywords

Antarctic torsEast Antarctic Ice SheetMesa Rangenoble gasesPrince Albert Mountainssurface exposure dating
Type
Earth Sciences
Information
Antarctic Science , Volume 20 , Issue 1 , February 2008 , pp. 89 - 98
Copyright
Copyright © Antarctic Science Ltd 2008

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