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Abundant micro-pyrite granules of various shapes occur in the hard black shales of the Aishiro alternation member of the Miocene Furue Formation in Shimane Peninsula, Southwest Japan. These granules a...re composed of micro-pyrite crystals, micro-pyrite spherules, and diatoms replaced with pyrite. The mechanism of replacement and the origin of pyrite are discussed in relation to the micro-pyrite spherules and diatoms. The results of these studies seem to support the interpretation that sulfur bacteria and sulfate reducing bacteria work as a catalizer during the precipitation of sedimentary pyrites. A general description of the geology and paleontology of the area is also given.show more
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18_02_p313