Stable carbon isotopes of organic matter in Neogene sediments of the Shinjo basin

Stable carbon isotope study was carried out on coexisting bitumen and kerogen in sediments of the Shinjo basin. The δ13C values of bitumen and kerogen change from −26 to −22‰ and from −25 to −21‰, respectively, from the top to the bottom sediments of an about 1, 600m thick profile. The difference in...

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Bibliographic Details
Published in:GEOCHEMICAL JOURNAL 1985/06/20, Vol.19(3), pp.175-179
Main Authors: Shimoyama, Akira, Matsubaya, Osamu
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
Isotope geochemistry
Isotope geochemistry. Geochronology
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Summary:Stable carbon isotope study was carried out on coexisting bitumen and kerogen in sediments of the Shinjo basin. The δ13C values of bitumen and kerogen change from −26 to −22‰ and from −25 to −21‰, respectively, from the top to the bottom sediments of an about 1, 600m thick profile. The difference in δ13C between bitumen and kerogen at each horizon is approximately constant (average, −0.89‰), even down to the horizones where oil generated. This result shows that bitumen was liberated from kerogen, but no specific isotopic fractionation was involved in the oil-generating zone in comparison to non oil-generating zone. It also shows that oil components at each horizon have been little contaminated by those from adjacent horizones above and below.
ISSN:0016-7002
1880-5973
DOI:10.2343/geochemj.19.175