Mathematics – Logic
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56..763z&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 56, Issue 2, pp.763-774
Mathematics
Logic
7
Scientific paper
The timing and pathways of early diagenetic sulfur transfer from dissolved species in pore waters to solid inorganic and organic compounds in sediments have been studied in the Miocene Monterey Formation, Santa Maria Basin (onshore), California. Correlation between concentrations of total organic carbon (TOC) and total sulfur (TS), in addition to concentrations of titanium, aluminum, total iron, and reactive iron, have been used to infer organic matter reactivity, redox conditions, and relative rates of clastic and biogenic input for each lithofacies. Isotopic compositions of six sulfur species (acid-volatile, disulfide, kerogen, bitumen, sulfate and elemental) have provided information regarding relative timing of sulfur incorporation, sulfate diffusivity in the upper centimeters of the sediments, and the sources of sulfur for individual species. Isotopically, the disulfide species expresses the greatest fractionation relative to estimated values of Miocene seawater sulfate (~ +22 CDT ). On average, disulfide is depleted in 34 S by 10.4%. relative to kerogen and by 9.9 relative to acid-volatile sulfide. The 34 S of bitumen shows no systematic change relative to 34 S keregon , suggesting the presence of migrated bitumen. Isotopic similarity of sulfate and elemental sulfur to sulfides and bitumen indicates that sulfate and elemental sulfur are chemical and/or biological oxidation products derived from sulfides and bitumen. Consistent ordering of isotopic values for sulfur species (disulfide < acid-volatile sulfide kerogen) indicates that pyrite precipitated nearest to the sediment-water interface under mildly reducing conditions and with little or no decrease in sulfate concentration relative to seawater. Enrichment of 34 S in acid-volatile sulfide and kerogen sulfur resulted from formation of these species at greater depths or in restricted micro-environments under more reducing conditions and with low concentrations of porewater sulfate. The formation of acid-volatile sulfide after pyrite but during early diagenesis is significant because it implies more strongly reducing conditions than are generally recognized in deep-water marine sediments.
Pratt Lisa M.
Zaback Doreen A.
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