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Post-GOE Putrefaction In Sediments: Global Occurrences Of Diagenetic Spheroids.pdf

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Summary

The effects of the Palaeoproterozoic Great Oxidation Event (GOE) were widespread and diverse, including extensive oxidation of organic matter (OM) in Gabon and N.W. Russia. However, little is known about the global extent of this event and the sedimentological changes after the GOE.

Late Palaeoproterozoic macroscopic concretions, millimetric granules, microscopic rosettes, and other self-similar mineralogical spheroids have spheroidally-concentric layers of diagenetic minerals. These rocks commonly contain apatite, carbonate, OM, pyrite, and/or ferric-ferrous phyllosilicates and oxides, and possess compositions expected from the mineralization of decomposed biomass with various oxidants.

The organic matter in these rocks has highly variable crystallinity, molecular functionality, and 13C-depleted carbonate, demonstrating that oxidation of biomass occurred during diagenesis. The presence of trace levels of sulphate, halogens, and carboxyl functional groups bonded to variably oxidised OM in diagenetic spheroids lead to the proposition that chemically-oscillating reactions best explain all the observations of authigenic and diagenetic mineral spheroids.

The rise of diagenetic spheroids during the late Palaeoproterozoic was caused by the widespread decomposition of biomass.

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The Great Oxidation Event led to widespread putrefaction in sediments after the Palaeoproterozoic era. Researchers investigated this phenomenon.

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