変成岩中炭質物の石墨化作用からみる変成地域の地質構造解析(<特集>地球における炭素の循環)

概要

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The structural change of carbonaceous material from coalification to graphitization is reviewed based on the X-ray diffraction analysis. As increasing temperature, thickness of carbon-sheets stack increases and those apparent d-spacing decreases. We estimated the error of apparent crystal size (Lc) and d-spacing (d_<0002>) by the experiments. In the medium grade zone of the Sanbagawa metamorphic belt of the Kanto Mountains, the error is so small to recognize any discontinuous change of temperature within the studied metamorphic sequence. We also presented two case-studies on the Sanbagawa metamorphic belt of the Kanto Mountains and of the Tenryu district. The results suggest that the graphitization analysis is a good tool for studying the thermal structure of metamorphic sequences as well as estimating a presence of the post-metamorphic thrust-fault system.
地学団体研究会の論文
1994-07-25