Heterogeneties of hydrocarbon compositions in mudstones of a turbiditic sequence of the Miocene Kawabata Formation in Yubari, Central Hokkaido, Japan

• OKANO KAZUKI

  Department of Natural History Sciences, Faculty of Science, Hokkaido University

• SAWADA KEN

  Department of Natural History Sciences, Faculty of Science, Hokkaido University

書誌事項

タイトル別名

• Heterogeneities of hydrocarbon compositions in mudstones of a turbiditic sequence of the Miocene Kawabata Formation in Yubari, central Hokkaido, Japan

抄録

Biomarker analyses of aliphatic and aromatic hydrocarbons were conducted on the upper and lower parts of individual mudstones in a turbiditic sequence of the Miocene Kawabata Formation, Yubari, central Hokkaido, Japan. The relative abundances of terrigenous biomarkers such as long-chain n-alkanes, C₂₉ steranes and oleanenes as well as biomarkers produced in coastal areas such as dinosteranes tend to be higher in the lower parts of mudstones than those of the upper ones in the turbiditic sequence. Also, pristane/phytane ratios, which are proxies for depositional environment, significantly vary between the upper and lower parts of mudstones in the turbiditic sequence. These results suggest that these variations reflect the types and phases of transport and redeposition by turbidity systems rather than postdepositional diagenesis. Such heterogeneous distributions in most of biomarker compositions within the mudstone layers may lead to a severe bias for reconstructing paleoenvironment and paleoecology. Nevertheless, the higher plant parameters (HPPs) such as the retene/cadalene ratios are consistently homogenous within the mudstones. Moreover, paleovegetation reconstructed from HPPs are concordant with a previous paleobotanical study. Thus, it seems that these biomarker records in the turbidite sediments are reliable and strongly applicable for reconstructing terrestrial paleovegetation.

収録刊行物

• ＧＥＯＣＨＥＭＩＣＡＬ　ＪＯＵＲＮＡＬ

  ＧＥＯＣＨＥＭＩＣＡＬ　ＪＯＵＲＮＡＬ 42 (2), 151-162, 2008

  一般社団法人日本地球化学会

キーワード

• hydrocarbon biomarker
• turbiditic sequence
• geochemical heterogeneity
• terrigenous material transport
• paleoenvironment

詳細情報

• CRID: 1390001204549934336
• NII論文ID: 10021093226
• NII書誌ID: AA00654975
• DOI: 10.2343/geochemj.42.151
• COI: 1:CAS:528:DC%2BD1cXnsl2gs74%3D
• ISSN: 18805973
• ISSN: 00167002
• NDL書誌ID: 9470214
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9470214
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可