Exposure ages for Pleistocene periglacial deposits in Australia

Timothy T. Barrows; John O. Stone; L. Keith Fifield

doi:10.1016/j.quascirev.2003.10.011

Exposure ages for Pleistocene periglacial deposits in Australia

Timothy T. Barrows^*, John O. Stone, L. Keith Fifield

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

96 Citations (Scopus)

Abstract

Pleistocene periglacial landforms are widespread in Australia and provide valuable information on past temperatures, but dating the time of their formation has proven difficult. To remedy this, we have explored the use of cosmogenic ³⁶Cl for direct dating of periglacial deposits. We sampled six deposits in four locations in southeastern Australia, ranging from blockstreams and block slopes to former rock glaciers. Eighteen exposure ages reveal a concentration of periglacial activity during the last glacial maximum (LGM) between 16 and 23ka, with a population having a weighted mean age of 21.9±0.5ka. This age is shortly before the time of maximum ice advance during the LGM in southeastern Australia. Exposure dating of block deposits provides a way of extending the chronology of cold climate activity beyond glaciated regions.

Original language	English
Pages (from-to)	697-708
Number of pages	12
Journal	Quaternary Science Reviews
Volume	23
Issue number	5-6
DOIs	https://doi.org/10.1016/j.quascirev.2003.10.011
Publication status	Published - Mar 2004

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title = "Exposure ages for Pleistocene periglacial deposits in Australia",

abstract = "Pleistocene periglacial landforms are widespread in Australia and provide valuable information on past temperatures, but dating the time of their formation has proven difficult. To remedy this, we have explored the use of cosmogenic 36Cl for direct dating of periglacial deposits. We sampled six deposits in four locations in southeastern Australia, ranging from blockstreams and block slopes to former rock glaciers. Eighteen exposure ages reveal a concentration of periglacial activity during the last glacial maximum (LGM) between 16 and 23ka, with a population having a weighted mean age of 21.9±0.5ka. This age is shortly before the time of maximum ice advance during the LGM in southeastern Australia. Exposure dating of block deposits provides a way of extending the chronology of cold climate activity beyond glaciated regions.",

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AB - Pleistocene periglacial landforms are widespread in Australia and provide valuable information on past temperatures, but dating the time of their formation has proven difficult. To remedy this, we have explored the use of cosmogenic 36Cl for direct dating of periglacial deposits. We sampled six deposits in four locations in southeastern Australia, ranging from blockstreams and block slopes to former rock glaciers. Eighteen exposure ages reveal a concentration of periglacial activity during the last glacial maximum (LGM) between 16 and 23ka, with a population having a weighted mean age of 21.9±0.5ka. This age is shortly before the time of maximum ice advance during the LGM in southeastern Australia. Exposure dating of block deposits provides a way of extending the chronology of cold climate activity beyond glaciated regions.

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Exposure ages for Pleistocene periglacial deposits in Australia

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