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January-February GSA Bulletin media highlights
Date:1/12/2009

eposits, and furthermore that a better understanding of this coupling might offer unique insights in the origin of these rocks. The study by Fischer et al. used material from a well-preserved about 2.7-2.5 billion year old carbonate platform succession collected as part of the Agouron South African Drilling Project. With a particular focus on the silica cycle and using field geology, petrography, and carbon isotopes, they have assembled a conceptual model for BIF deposition that demonstrates mechanistically how an active Late Archean biological redox cycle of iron can explain the environmental, textural, mineralogical, geochemical, and paleontological features of BIFs. Because the Archean fossil record is notably poor, this hypothesis for BIF deposition is important because, if correct, it adds significant understanding about Late Archean biology and the environmental theater for the coming oxygen revolution.


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Contact: Christa Stratton
cstratton@geosociety.org
303-357-1093
Geological Society of America
Source:Eurekalert

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