Age of loess deposits in the Central Tablelands of New South Wales

Paul P. Hesse*, Geoff S. Humphreys, Barton L. Smith, James Campbell, Elizabeth K. Peterson

*Corresponding author for this work

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Basal optically stimulated luminescence (OSL) ages of more than 50000 years in loessic (parna) mantles on the Central Tablelands of New South Wales indicate significant aeolian silt (c. 30 μm mode) deposition commenced well before the onset of the last glacial maximum. Each mantle consists of >1 m of reddish silty clay loam-silty clay with an earthy fabric which sits atop manganese and iron pans and saprolite. Mixing of saprolite-derived material into the pans and also into the silty layer indicates a site history of steady accumulation of aeolian loess and continual pedogenesis. No palaeosols are found. The OSL chronology of both sites, while low resolution, indicates an almost constant mass accumulation rate from 50000 years ago through the last glacial maximum and into the Holocene. Local factors affecting retention of deposited dust may be responsible for the apparent passivity of the sites.

Original languageEnglish
Pages (from-to)1115-1131
Number of pages17
JournalAustralian Journal of Soil Research
Volume41
Issue number6
DOIs
Publication statusPublished - 2003

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