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Pyrite with high Mn content from the Nankai Trough formed from subduction-induced cold seepage


, : Pyrite with high Mn content from the Nankai Trough formed from subduction-induced cold seepage. Marine Geology 118(3-4): 303-313

Pyrite and abundant calcite occur in a sandstone pipe collected from the eastern Nankai Trough. Electron microprobe analysis of the pyrite indicates that it contains appreciable amounts of manganese (up to 1.5 MnS (sub 2) mole %). The present data and previous analytical data on pyrite indicate that manganese content of anoxic sedimentary pyrite is high but of hydrothermal pyrite very low. In the pyrite studied here, isomorphous substitution of manganese occurs. Stable isotope data on calcite coexisting with the pyrite as well as chemical data on the advecting fluids indicate that the advecting fluids are characterized by reducing conditions, high concentrations of methane, hydrogen sulfide and manganese and high Mn/Fe ratios. These characteristics could be responsible for the high manganese content of pyrite. Adsorption of manganese by a precursor (iron sulfide) may also be an important factor. The present study demonstrates that the manganese content of pyrite is potentially a useful indicator of sedimentary and diagenetic processes and of the geological characteristics of ancient terrestrial sedimentary rocks.

US$19.90

DOI: 10.1016/0025-3227(94)90090-6


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