Evaluation of sedimentary processes of plant particles by gravity flow using biomarkers in plant fragment-concentrated sediments of a turbiditic sequence in the Miocene Kawabata Formation distributed along the Higashiyama-gawa River, Yubari, Hokkaido, Japan
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- Furota Satoshi
- Department of Natural History Sciences, Faculty of Science, Hokkaido University
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- Sawada Ken
- Department of Natural History Sciences, Faculty of Science, Hokkaido University
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- Kawakami Gentaro
- Geological Survey of Hokkaido, Hokkaido Research Organization
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Distinctive plant fragment-concentrated sandstones are found in a turbiditic sequence deposited under deep sea environment in the Miocene Kawabata Formation distributed along the Higashiyama-gawa River, Yubari, central Hokkaido, Japan. We observed microscopically the plant fragments and analyzed terrestrial higher plant biomarkers in the sediments to evaluate sedimentological and hydrodynamic behaviors of plant particles by gravity flow depositional processes. Biomarker compositions such as pristane/phytane and regular sterane ratios indicate a large contribution of terrestrial organic matter, especially woody fragments, in the sandstone layer. The relative abundances of terrestrial higher plant terpenoids (pentacyclic triterpenoids, des-A-triterpenoids and diterpenoids) are high in all parts of the sandstone layer, while long-chain n-alkane concentrations are remarkably higher only at the uppermost part. Also, leaf cuticle fragments are mainly found in the uppermost part. These results suggest that plant leaves are mainly deposited in the uppermost part of the sandstone layer. Thus, it is concluded that the variations in plant fragment types (tissues) deposited are thought to be resulted from various hydrodynamic behavior in gravity flow.
収録刊行物
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- Researches in Organic Geochemistry
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Researches in Organic Geochemistry 30 (1), 9-21, 2014
日本有機地球化学会
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詳細情報 詳細情報について
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- CRID
- 1390282680389359744
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- NII論文ID
- 110009912918
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- NII書誌ID
- AA11889471
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- ISSN
- 21897891
- 13449915
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- NDL書誌ID
- 026252163
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可