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Title Transcription
チュウ シンセイ オナガワ ケイシツ タイセキブツ チュウ ノ イソプレノイド チオフェン
Title Alternative
Isoprenoid Thiophenes in Miocene Onnagawa Siliceous Sediments, Japan
File
language
eng
Author
Suzuki, Noriyuki
Description
The isoprenoid thiophenes with 20 carbons (3-methyl-2-(3.7,1 l-trimethyldodecyl)-thio-phene and 3-(4,8,12-trimethyltridecyl)-thiophene) are significantly detected in Miocene Onnagawa siliceous sediments (sample 82408) from Oomagari, Akita Prefecture, Japan. Associated kerogen is also rich in organosulphur (S 7.7% and atomic S/C 0.063) and can be classified as Type II-S kerogen. The isoprenoid thiophenes are possibly formed abiogenically by reactions of H2S with several phytadiene isomers derived from dehydration and reduction of phytol in the very early stage of diagenesis. The isoprenoid thiophenes are not always detected in contemporaneous siliceous and non-siliceous sediments. The unique presence of isoprenoid thiophenes in Onnagawa siliceous sediments from Oomagari is due to the followings: (1) the sample is anomalously poor in clay minerals having active iron which removes HIS. (2) the marked contribution of diatom-derived organic matter rich in chlorophyll-derived phytol as a precursory compound of isoprenoid thiohenes, and (3) the anoxic condition favorable for the formation of abundant H2S as source of organosulphur.
Journal Title
Memoirs of the Faculty of Science, Shimane University
Volume
26
Start Page
107
End Page
115
ISSN
03879925
Published Date
1992-12-25
NCID
AN00108106
Publisher
島根大学理学部
Publisher Aalternative
The Faculty of Science, Shimane University
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Shimane University
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