1998 Fiscal Year Final Research Report Summary
Formation and evolution of kerogen as revealed by molecular and isotopic studies
| Project/Area Number |
08404037
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
地球化学
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| Research Institution | TOKYO METOROPOLITAN UNVERSITY |
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Principal Investigator |
ISHIWATARI Ryoshi Graduate School of Science, Department of Chemistry, Tokyo Metropolitan University, Professor, 理学研究科, 教授 (90087106)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAMOTO Shuichi Faculty of Education, Soka University, Professor, 教育学部, 教授 (20182628)
NARAOKA Hiroshi Graduate School of Science, Department of Chemistry, Tokyo Metropolitan University, Associate Professor, 理学研究科, 助教授 (20198386)
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| Project Period (FY) |
1996 – 1998
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| Keywords | kerogen / lake sediment / chemical degradation / insoluble organic matter / biomarker / hydrocarbon / marine sediment / 湖 |
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| Research Abstract |
Chemical and geochemical studies were undertaken for insoluble organic matter (kerogen) isolated from recent lacustrine (Lake Suigetsu: brackish water lake) and sedimentary rocks (a marine environment in Miocene age: Shinjo-district). Much effect was devoted for isolating biomarkers present in the structure of these kerogens.
We examined a chemical degradation with TiClィイD24ィエD2-LiAlHィイD24ィエD2 to cleave the S-C bonds in kerogen, and found that this degradation method is better than previously developed methods in term of specificity.
We applied this and other methods (boron trichloride/LiAlHィイD24ィエD2 for C-O scission and flash pyrolysis of C-C scission) to kerogens isolated from brackish lake sediments. We detected gammacerane, polyhydroisorenieratene, steroids and hopanoid compounds, and many kinds of compounds with long-methylene chains. From these studies we conclude that a portion of kerogen is formed via condensation of many kinds of biomarkers in early stages of burial of biological materials in sediments.
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