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Uranium-Series Ages of Corals and Coexisting Phosphate Deposits on Pelsaert Reef Complex, Houtman-Abrolhos Islands, Western Australia

Published online by Cambridge University Press:  20 January 2017

H. Herbert Veeh  and
Roy E. France
H. Herbert Veeh
Affiliation:
School of Earth Sciences, Flinders University of South Australia, Bedford Park, South Australia 5042, Australia
Roy E. France
Affiliation:
Western Mining Corporation Ltd., P.O. Box 409, Unley, South Australia 5061, Australia
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Abstract

An unusually well-defined association between guano-derived phosphate rock (apatite) and coral carbonates on Pelsaert Island has provided an opportunity to test uranium-series dating methods as applied to insular phosphorites. The phosphate deposit, which is bracketed by late Pleistocene and Holocene corals with 230Th/234U ages of 120,000 and 4700 yr B.P., respectively, has 230Th/234U ages ranging from 85,000 to 112,000 yr B.P. The mutually consistent results suggest that phosphate deposition commenced soon after the peak of the last interglaciation and has been largely controlled by sea-level fluctuations and probably other factors associated with late Quaternary climate in this area.

Type
Research Article
Information
Quaternary Research , Volume 30 , Issue 2 , September 1988 , pp. 204 - 209
Copyright
University of Washington

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