We propose to obtain high-resolution trace metal geochemical profiles from organic-rich mudrocks (ORM) to examine the evolution of biospheric oxygenation in Late Archean to Middle Proterozoic oceans. The value of high-resolution geochemical profiling was shown in prior collaborative work by the PIs on 2.6-2.5 Ga ORM from Western Australia and South Africa. This work points uniquely to oxygenic photosynthesis and surface ocean oxygenation at least 50-100 M.y. before the first rise of atmospheric O2 (2.45-2.32 Ga Great Oxidation Event; GOE). Our chemostratigraphic approach revealed an otherwise unrecognized history of biospheric oxygenation that is more complex than previously realized. Despite this success, high-resolution geochemical profiles for other Precambrian stratigraphic sections are not yet available.x
|Effective start/end date||7/1/10 → 6/30/14|
- National Science Foundation (NSF): $152,135.00
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