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＜departmental bulletin paper＞
Organic-geochemical studies on alteration of resinit during diagenesis
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| Abstract | Alterations of chemical structure of resinites during diagenesis were investigated by elemental analysis, infrared (IR) absorption spectroscopy and pyrolysis gas chromatography-mass spectrometry (GC-M...S). Specimens of resinite were picked up from the coaly samples collected at seven different coal fields, i.e. Latrobe Valley (Australia), Fushun (China), Ube (Yamaguchiken), Tokusue in Karatsu coal field (Saga-ken), Nakama and Orio in Chikuho coal field (Fukuoka-ken), and Kuji (Iwate-ken). Vitrinite reflectance values (Ro) were determined on vitrinites coexisting in the coaly samples from which the resinites were picked out. The Ro values were compared with the data obtained by the analytical methods. The results revealed the following facts: 1) The gross feature of IR spectra of all examined resinites are resembled each other to indicate the similarity of gross chemical structure among the resinites. 2) IR absorption intensities due to hydroxyl, carbonyl, and exomethylene groups decrease according to incremental increase of the Ro values. This indicates that, during the process of diagenesis, decarboxylation reactions and polymerization reactions occurred at the positions where the carboxyl and exomethylene groups located in the molecule. 3) On pyrolysis at 445℃, the resinites yielded aliphatic hydrocarbons whose distribution patterns were characteristic to individual specimen. The main products obtained at 740℃ were aromatic hydrocarbons 4) Low and high resolution mass spectra of Latrobe resinite, obtained using a direct inlet system, revealed that the basic skeletal unit of the chemical structure of the polymer of the resinite had elemental composition of C_20H_30O_2.show more |
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| Created Date | 2021.10.18 |
| Modified Date | 2023.11.17 |