Carbon isotope signatures of bacterial 28-norhopanoic acids in Miocene–Pliocene diatomaceous and phosphatic sediments
書誌事項
- 公開日
- 2005-05
- 権利情報
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- https://www.elsevier.com/tdm/userlicense/1.0/
- DOI
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- 10.1016/j.chemgeo.2005.01.027
- 公開者
- Elsevier BV
この論文をさがす
説明
Abstract A series of C 29 –C 31 28-norhopanoic acids occur in Neogene marine sediments of the Onnagawa, Funakawa and Tentokuji Formations, northeastern Japan, and in the Monterey Formation of California, USA. The 28-norhopanoic acids exist mainly as free acids but are partly bound to kerogen and the polar fraction of the solvent extract via an ester bond. The 13 C depletions of C 29 and C 31 28-norhopanoic acids compared with those of C 30 and C 32 regular hopanoic acids indicate that these 28-demethylated and regular hopanoic acids are derived from different precursor organisms. The Upper Onnagawa Formation contains abundant 28-norhopanoic acids and is characterized by the occurrence of Calyptogena sp. (Bivalvia), which lives in a specific chemoautrophic ecosystem that utilizes chemical substrates from hydrothermal vents or cold seeps. The depletion of 28-norhopanoic acids in 13 C compared with kerogen suggests that the 28-norhopanoic acids have been derived from bacteria that utilized 13 C-depleted CO 2 as their carbon source.
収録刊行物
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- Chemical Geology
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Chemical Geology 218 (1-2), 117-133, 2005-05
Elsevier BV