Reassessment of the record of linear dune activity in Tasmania using optical dating

Reassessment of the record of linear dune activity in Tasmania using optical dating Stabilized linear dunes in northeastern Tasmania have previously been dated using luminescence signals from quartz (Duller G.A.T, Augustinus, P., 1997 Luminescence studies of dunes from north-eastern Tasmania. Quaternary Geochronology (QSR) 16, 357–365.) and gave ages from 44±4 to 29±3 ka. Unexpectedly, no evidence was found for dune activity at the last glacial maximum (LGM). The ages were obtained using analytical methods available at the time, including multiple aliquot methods. In recent years the single aliquot regenerative dose (SAR) procedure has been developed, and this method gave ages from 23.8±1.6 to 21.8±1.3 ka for the same samples. A further seven samples from other linear dunes in the area gave ages from 16.8 to 19.7 ka. These ages are strong evidence that linear dunes in northeastern Tasmania were last active at, or immediately after, the LGM, consistent with evidence for enhanced aridity through large parts of the Australian continent at that time. Earlier methods of optical dating using quartz did not explicitly check for changes in luminescence sensitivity and thus their reliability must be suspect. For samples measured here, the largest discrepancy in equivalent dose between the sensitivity corrected and non-sensitivity corrected data is 84%, while for the remainder it is much smaller. These results demonstrate the importance of checking the validity of previously published optical dating results which were obtained using methods that did not explicitly check for sensitivity change. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quaternary Science Reviews Elsevier

Reassessment of the record of linear dune activity in Tasmania using optical dating

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Publisher
Elsevier
Copyright
Copyright © 2006 Elsevier Ltd
ISSN
0277-3791
eISSN
1873-457X
DOI
10.1016/j.quascirev.2005.05.010
Publisher site
See Article on Publisher Site

Abstract

Stabilized linear dunes in northeastern Tasmania have previously been dated using luminescence signals from quartz (Duller G.A.T, Augustinus, P., 1997 Luminescence studies of dunes from north-eastern Tasmania. Quaternary Geochronology (QSR) 16, 357–365.) and gave ages from 44±4 to 29±3 ka. Unexpectedly, no evidence was found for dune activity at the last glacial maximum (LGM). The ages were obtained using analytical methods available at the time, including multiple aliquot methods. In recent years the single aliquot regenerative dose (SAR) procedure has been developed, and this method gave ages from 23.8±1.6 to 21.8±1.3 ka for the same samples. A further seven samples from other linear dunes in the area gave ages from 16.8 to 19.7 ka. These ages are strong evidence that linear dunes in northeastern Tasmania were last active at, or immediately after, the LGM, consistent with evidence for enhanced aridity through large parts of the Australian continent at that time. Earlier methods of optical dating using quartz did not explicitly check for changes in luminescence sensitivity and thus their reliability must be suspect. For samples measured here, the largest discrepancy in equivalent dose between the sensitivity corrected and non-sensitivity corrected data is 84%, while for the remainder it is much smaller. These results demonstrate the importance of checking the validity of previously published optical dating results which were obtained using methods that did not explicitly check for sensitivity change.

Journal

Quaternary Science ReviewsElsevier

Published: Oct 1, 2006

References

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