Re-Os isotopic age constraints on deposition in the Neoproterozoic Amadeus Basin

implications for the 'Snowball Earth'

B. F. Schaefer*, J. M. Burgess

*Corresponding author for this work

Research output: Contribution to journalArticle

35 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)825-828
Number of pages4
JournalJournal of the Geological Society
Issue number6
Publication statusPublished - Nov 2003
Externally publishedYes


  • Absolute age
  • Amadeus Basin
  • Re-Os isotopes
  • Snowball Earth

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