Organic compositions of the embryo-bearing lowermost Cambrian Kuanchuanpu formation on the northern Yangtze platform, China

Yoko Kunimitsu, Tetsuhiro Togo, Yoshikazu Sampei, Akihiro Kano, Kinya Yasui

研究成果: Contribution to journalArticle査読

12 被引用数 (Scopus)

抄録

We investigated the origin of organic matter and paleoceanographic conditions of the embryo-bearing lowermost Cambrian Kuanchuanpu Formation in Shaanxi Province, China, in terms of sedimentary facies, fossil morphometry, and organic geochemistry, including biomarker compositions. The results indicated the abundance of algae and eukaryotic phytoplankton that fueled a diverse ecosystem including cnidarians and small shelly fossils. The water column contained enough oxygen to provide habitat for benthic cnidarians such as Olivooides. On the other hand, low pristane/phytane ratios, detection of squalane, and hopane composition indicate reductive conditions within the sediments, and that the redox front was likely near the water-sediment interface. Common occurrences of pyrite and barite indicate that redox reactions of sulfur species were activated at the water-sediment interface. Such circumstances and the high phosphate concentration in ambient water may recall the presence of sulfur-oxidizing bacteria that promoted the phosphatization of animal embryos, as suggested for in the Neoproterozoic Doushantuo Formation. Nitrogen was the limiting nutrient for primary productivity, and the high phosphate concentration in the ocean promoted the phosphatization of animal embryos at the reductive water-sediment interface.

本文言語英語
ページ(範囲)499-506
ページ数8
ジャーナルPalaeogeography, Palaeoclimatology, Palaeoecology
280
3-4
DOI
出版ステータス出版済み - 9 15 2009

All Science Journal Classification (ASJC) codes

  • 海洋学
  • 生態、進化、行動および分類学
  • 地表過程
  • 古生物学

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