Journal
GEOCHEMICAL JOURNAL
Volume 43, Issue 1, Pages 29-35Publisher
GEOCHEMICAL SOC JAPAN
DOI: 10.2343/geochemj.1.0004
Keywords
benzohopanes; diaromatic 8(14)-secohopanoids; Late Permian carbonates; diagenesis; GC-MS
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Funding
- 21st Century Center of Excellent (COE) Program on Advanced Science and Technology Center for the Dynamic Earth at Tohoku University
- Ministry of Education, Culture, Sports, Science, and Technology of Japan (MEXT)
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We have delected a family of benzohopanes cyclised at C-20 and two families of diaromatic 8(14)-secohopanoids, in carbonates from the Late Permian Meishan (China) and Bulla (Italy) sections. Furthermore, we have identified a C-33 8(14)-secohopanoid possessing a fluorene moiety. The relative distribution of 8(14)-secohopanoids with a fluorene moiety was similar to that of benzohopanes cyclised at C-20, suggesting that the secohopanoids might be diagenetic products of benzohopanes. or that the benzohopanes and secohopanoids share the same precursor. Furthermore, the series of benzohopanes cyclised at C-16 was not detected front the carbonates of the two sections, which might suggest that the benzohopanes cyclised at C-16 are thermodynamically less stable than those with the aromatic ring attached at C-20.
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