Was there a conflict at the Neoproterozoic-Cambrian boundary: Evidence from sulfur isotope composition?

Based on evaporite sequences of the Irkutsk amphitheater, it is shown that sulfur in the Vendian-Lower Cambrian sedimentary sulfates displays a very wide scatter of sulfur isotope ratios and enrichment in heavy sulfur up to average values of δ^sup 34^S [asymptotically =] +(27-30)[per thousand]. Thes...

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Bibliographic Details
Published in:Lithology and Mineral Resources 2007-02, Vol.42 (1), p.1-14
Main Author: Vinogradov, V. I.
Format: Article
Language:English
Subjects:
Cambrian
Isotopes
Oceans
Sulfate reduction
Sulfates
Sulfur
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Summary:Based on evaporite sequences of the Irkutsk amphitheater, it is shown that sulfur in the Vendian-Lower Cambrian sedimentary sulfates displays a very wide scatter of sulfur isotope ratios and enrichment in heavy sulfur up to average values of δ^sup 34^S [asymptotically =] +(27-30)[per thousand]. These features are related to sulfate reduction, which is distinctly expressed like other secondary alterations in the studied sections. Average δ^sup 34^S values reflect the dynamics of isotopic effects rather than the initial sulfur composition of the oceanic water. The Irkutsk amphitheater can be considered natural model of sulfur isotopic variations in ancient evaporites. Existing concepts of the sulfur isotopic composition of Cambrian oceans need to be revised.[PUBLICATION ABSTRACT]
ISSN:0024-4902
1608-3229
1573-8892
DOI:10.1134/S0024490207010014