Uranium disequilibrium dating of phosphate deposits from the Lau Group, Fiji

Uranium-series methods of absolute age determinations were first applied to fossil coral reefs 1 and more recently to fossil bone 2 , marine apatite 3–6 and insular apatite 7,8 . Past sea level stands, climatic conditions, primary productivity, and other factors are thought to be influential in the...

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Bibliographic Details
Published in:Nature (London) 1983-01, Vol.302 (5909), p.603-606
Main Authors: Roe, Kevin K., Burnett, William C., Lee, Annabelle I. N.
Format: Article
Language:English
Subjects:
Humanities and Social Sciences
letter
Marine
multidisciplinary
Science
Science (multidisciplinary)
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Summary:Uranium-series methods of absolute age determinations were first applied to fossil coral reefs 1 and more recently to fossil bone 2 , marine apatite 3–6 and insular apatite 7,8 . Past sea level stands, climatic conditions, primary productivity, and other factors are thought to be influential in the deposition of avian guano and subsequent insular phosphorite formation 9 . Some deposits appear to have formed during high stands of the sea while others may be related to glacial epochs 8 . We report here an attempt to determine the absolute age of two phosphate deposits in the Lau Group, Fiji by uranium-series disequilibrium techniques, in order to assist in the evaluation of their origin in terms of known palaeoclimatic information.
ISSN:0028-0836
1476-4687
DOI:10.1038/302603a0