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ID 48605
file
creator
Mita, Hajime
Shimoyama, Akira
abstract
Forty five mono- and 12 bicyclic alkanes were detected in a sedimentary sequence from Miocene to Pliocene in the Shinjo basin, northeastern Japan. The monocyclic alkanes included polyalkylcyclohexanes (C9, C10, C11, and C13), a series of n-alkylcyclohexanes (C9–C26) and a series of n-alkylcyclopentanes (C12–C26). The bicyclic alkanes were from C9 to C12, including cis- and trans-hydrindanes, cis- and trans-decalins, and methyl- and dimethyldecalins. These cyclic alkanes were detected at a level of 0.01–1 nmol g–1. Concentrations of 2-alkyl-1,1,3-trimethylcyclohexanes (C11 and C13), a major portion of n-alkylcyclohexanes (C11–C26), all n-alkylcyclopentanes, and methyl- and dimethyldecalins showed a maximum in the lower part of the sequence which has been known to be an oil generation zone. n-Alkane (C15–C38) concentration as well as that of pristane and phytane also showed a maximum in the lower part. Concentrations of 1,1,3-trimethyl-, and 1,1,2,3-tetramethylcyclohexanes, a minor portion of n-alkylcyclohexanes (C9 and C10), cis-hydrindane, cis- and trans-decalin showed a maximum in the middle part of the sequence. Only trans-hydrindane showed a maximum concentration in the upper part of the sequence, as did perylene. The molecular distributions of series of n-alkylcyclohexanes (C15–C26) and nalkylcyclopentanes (C15–C26) showed a predominance in a range from C15 to C18 in the upper part of the sequence, whereas that of n-alkanes did from C27–C31 in the part. However, the distributions of the three series became relatively smooth in the lower part, reflecting the further progress of diagenetic maturation resulting from the oil generation in the part.
description
This work was supported by the Grant-in-Aid for Scientific Research (B) No. 11440166 from the Ministry of Education, Science, Sports and Culture, Japan and the Research Grant for Fellowship No.00007064 to H. Y. from Japanese Society for the Promotion of Science.
journal title
Geochemical Journal
volume
Volume 36
issue
Issue 1
start page
31
end page
49
date of issued
2002-02-20
publisher
GEOCHEMICAL SOCIETY OF JAPAN
日本地球化学会
issn
0016-7002
1880-5973
0016-7002
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2002 GEOCHEMICAL SOCIETY OF JAPAN
relation url
department
Graduate School of Science



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