Scanning electron microscopy and sulfur isotopic characterization of pyrite in silicified wood fragment in Japan.
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Accession number;02A0639375
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| Title;Scanning electron microscopy and sulfur isotopic characterization of pyrite in silicified wood fragment in Japan. |
| Author;
YAMANAKA T
(Univ. Tsukuba, Ibaraki, Jpn)
MIZOTA C
(Iwate Univ., Morioka, Jpn)
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Journal Title;J Mineral Petrol Sci
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Journal Code:G0150B
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ISSN:1345-6296
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VOL.97;NO.3;PAGE.114-118(2002)
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| Figure&Table&Reference;FIG.1, TBL.1, REF.17 |
| Pub. Country;Japan |
| Language;English |
| Abstract;Five samples of fine-grained, authigenic pyrite seams in silicified woods from Tertiary marine to brackish sediments in Japan were examined on surface morphology by scanning electron microscopy (SEM) in combination with energy dispersive X-ray spectrometry (EDX) and on sulfur isotopic composition (.DELTA.34S). The surface morphology as revealed by SEM varied from long fibrous (pseudomorph after original plant fiber), spongy, blocky/cubic to framboidal (spherical aggregates of minute crystals). Except two samples from Chikuho coal mine area in northern Kyushu (Ebitsu: spongy fabric, .DELTA.34S=+3.5.PERMIL., +12.2.PERMIL.), all pyrite samples were characterised by fairly low .DELTA.34S values ranging from -40.0 to -20.1.PERMIL.. suggesting to be the products from steady state sulfate reduction, under an open system, of seawater-sulfate by sulfate-reducing bacteria. Pyrite in coal deposits from the Ebitsu area is also bacteriogenic, but probably formed under a closed system where original plant debris were deposit. Any clear trend between surface morphology and .DELTA.34S of the pyrite was not found. (author abst.) |
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