Scanning electron microscopy and sulfur isotopic characterization of pyrite in silicified wood fragment in Japan

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概要

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• 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 (δ34S). 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, δ34S=+3.5‰, +12.2‰), all pyrite samples were characterised by fairly low δ34S values ranging from −40.0 to −20.1‰, 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 δ34S of the pyrite was not found.

• 日本鉱物科学会の論文
• 2002-06-01

著者

• Yamanaka Toshiro

  Research Fellow Of The Japan Society For The Promotion Of Science Institute Of Geoscience University

• MIZOTA Chitoshi

  Department of Agriculture and Forestry, Faculty of Agriculture, Iwate University

• Mizota Chitoshi

  Department Of Agro-bioscience Faculty Of Agriculture Iwate University

• Mizota Chitoshi

  Department Of Agriculture And Forestry Faculty Of Agriculture Iwate University

関連論文

• A currently forming petroleum associated with hydrothermal mineralization in a submarine caldera, Kagoshima Bay, Japan
• Scanning electron microscopy and sulfur isotopic characterization of pyrite in silicified wood fragment in Japan

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