Pyrite-organic matter relationships: Currant Bush Limestone, Georgina Basin, Australia

Details Pyrite-organic matter relationships: Currant Bush Limestone, Georgina Basin, Australia Pyrite-organic matter relationships: Currant Bush Limestone, Georgina Basin, Australia

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49..989g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 49, Issue 4, pp.989-992

Physics

1

Scientific paper

The relationship between the TOC (total organic carbon) and S (pyritic sulphur) contents of some organic-rich (TOC 3-14%) silty limestones and calcareous siltstones from the Cambrian Currant Bush Limestone of the Georgina Basin, Australia, is similar to that of euxinic sediments, but could also indicate deposition in a non-saline environment. However, such conditions are not easily reconciled with the shallow equatorial epeiric sea in which the formation is considered to have been deposited. The relationship can alternatively be explained by the relatively low Fe content of the sediment being the main limiting factor in pyrite generation, coupled with a slightly increased degree of pyritization with increased TOC. The relationship between the TOC and S contents of organic-poor (TOC 0.2-2.4%) samples from the same formation is similar to that of normal marine sediments, but the Fe content is probably also the major controlling factor on pyrite generation. These interpretations demonstrate that in using TOC and S contents to aid in reconstruction of depositional environments, it is important to check whether Fe content could have been the limiting factor in the formation of pyrite, even in sediments with only moderate carbonate contents.

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