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Alteration of woody tissues of paleoplants during diagenesis and burialmetamorphic processes was studied by vitrinite reflectance measurements, microscopic Fourier transformation infrared spectroscopy..., pyrolysis gas chromatography-mass spectrometry, and elemental analyses. Coaly fragments, typical fossilized woody tissues, were collected at Akaishi mountains located in Shizuoka, Yamanashi, and Nagano prefectures, the central part of the Honshu Island of Japan. Geology of this area corresponds to the Shimanto and the Setogawa Groups of Cretaceous to Tertiary accretionary prisms in the eastern end of the outer zone of the southwest Japan arc. Vitrinite reflectance values of the coaly fragments varied from 0.5 to 6.0 %. In the western part of the Shimanto and the Setogawa Groups, the reflectance values decrease from 5.5 to 0.5 % corresponding to the geological age of older to younger in general. But in each unit of the formations, the reflectance values tend to increase from upper to lower horizon, and vary suddenly in both sides of thrust faults. The results of examinations of the coaly fragments by infrared spectroscopy indicate that the differences of coalification of the fossilized-palnt tissues appear as the differences of the relative intensities of the absorption bands due to aromatic rings and aliphatic chains. The analyses of the coaly fragments by pyrolysis gas chromatography-mass spectrometry reflect the organic metamorphism as the differences of total amount and molecular species of pyrolizates. Although vitrinite-reflectance measurement alone indicates the thermal history of the sediment as a result multiplied by maximum temperature and effective heating period, additional examinations by infrared spectroscopic methods and pyrolysis GCMS to the reflectance measurements probably makes it possible to discuss details of the temperature factor and time factor more clearly.続きを見る
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