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Cosmogenic radionuclide chronology of pre-last glacial cycles moraines in the Western Arthur Range, Southwest Tasmania

journal contribution
posted on 2023-05-17, 03:16 authored by Kiernan, K, Fink, D, Greig, DJ, Mifud, C
Cosmogenic 10Be and 26Al exposure ages of 12 boulders from two moraine complexes in the Western Arthur Range of southwest Tasmania, which previously were considered to have been deposited during the Last Glacial Maximum, predate the Last Glacial Cycle. Zero-erosion minimum exposure ages range from 95 ka to 232 ka based on weighted mean 10Be and 26Al ages per boulder. For a reasonable choice of erosion rates, 10Be boulder ages range from 105 to 326 ka, respectively. Although a direct association of moraine construction to a specific marine isotope stage (MIS) glaciation is not definitive, erosion-corrected exposure ages indicate glacial advances commensurate with MIS-6 and -10, although the latter advance may be attributable to MIS-8 if the erosion rate correction is an over-estimate. Given the relatively close proximity of the dated moraines to their source cirques, this new cosmogenic glacial chronology implies a very limited extent for any younger glacial advances that occurred in the Western Arthur Range during the Last Glacial Cycle (post MIS-5) including the global LGM.

History

Publication title

Quaternary Science Reviews: International Multidisciplinary Review and Research Journal

Volume

29

Issue

23-24

Pagination

3286-3297

ISSN

0277-3791

Department/School

School of Geography, Planning and Spatial Sciences

Publisher

Pergamon-Elsevier Science Ltd

Place of publication

The Boulevard, Langford Lane, Kidlington, Oxford, England, Ox5 1Gb

Rights statement

Copyright 2010 Elsevier Ltd

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the earth sciences

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