Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6442397 | Precambrian Research | 2012 | 24 Pages |
Abstract
⺠Strong tectonic and depofacies control over pyrite distribution, pyrite type, pyrite chemistry, S/C ratios and multiple sulfur and organic carbon isotope compositions (δ13Corg, δ34S, Î33S, Î36S). ⺠Preservation of detrital pyrite and non-zero Î33S values infers low O2 Mesoarchean atmosphere. ⺠Dampened Î33S values reflect dilution by a mass-dependent crustal sulfur reservoir. ⺠Tectonism, weathering, microbial sulfate reduction and anaerobic methanotrophy could have triggered Mesoarchean glaciation. ⺠Large Î33S values associated with diamictite may represent unique atmospheric chemistry and/or hydrological freeze-thaw cycles.
Keywords
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Authors
B.M. Guy, S. Ono, J. Gutzmer, A.J. Kaufman, Y. Lin, M.L. Fogel, N.J. Beukes,