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Journal of the Geological Society; 2003; v. 160; issue.6; p. 825-828;
DOI: 10.1144/0016-764903-050
© 2003 Geological Society of London

Short Communication

Re–Os isotopic age constraints on deposition in the Neoproterozoic Amadeus Basin: implications for the ‘Snowball Earth’

B.F. SCHAEFER1,2 & J.M. BURGESS3,4

1 1Department of Earth Sciences, The Open University, Walton Hall, MK7 6AA, UK.
2 2Present address: School of Geosciences, Monash University, Victoria 3800, Australia (e-mail: BSchaefer@mail.earth.monash.edu.au)
3 3Northern Territory Geological Survey, Smith St Mall, PO Box 2901, Darwin, NT 0801, Australia.
4 4Present address: Santos Ltd, 91 King William St, Adelaide, SA, Australia.

Re–Os isotopes have been measured on organic-rich sedimentary rocks from the Neoproterozoic Aralka Formation in the Amadeus Basin, central Australia. These sedimentary rocks closely predate the Marinoan glaciation, a correlative of the global ‘Snowball II’ event. The Aralka Formation sedimentary rocks preserve an age of 592 ± 14 Ma, which is interpreted to represent the age of deposition. This age is substantially younger than that inferred from global correlation studies. It indicates that the onset, duration and cessation of the glacial event, and subsequent deposition of >2 km of sediment prior to radiation of the earliest metazoan life assemblages is confined to c.40 million years.

Key Words: Re–Os isotopes • Snowball Earth • Amadeus Basin • absolute age




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