Earliest Cambrian fossil embryos and their fossilization processes and paleoceanographic background

Yoko Kunimitsu, Akihiro Kano, Kinya Yasui, Degan Shu, Jian Han, Hong Hua

研究成果: Contribution to journalArticle査読

1 被引用数 (Scopus)

抄録

Paleontological, petrological and geochemical studies from the Kuanchuanpu Formation in southern Shaanxi Province, strata known for the earliest Cambrian animal embryos, revealed the paleoceanographic settings and processes permineraling an exceptionally rich fauna. Lack of high-energy sedimentary structures and presence of fossilized photosynthetic microbes indicated that a calm and shallow depositional environment was developed on the northern marginal Yangtze platform. The upward-decreasing trend of reductive elements (Mn and Fe) in carbonate fraction indicated a gradual transition to oxic conditions, which allowed animals to inhabit during the deposition of the upper Kuanchuanpu Formation. The animal embryos and small shelly fossils were permineralized by apatite due to intensified upwelling that rose the concentration of phosphates in the bottom water. The intensified upwelling was probably responsible for the upward-decreasing trend of the carbonate δ13C values. The permineralization selectively proceeded in the organic lipid membranes that were resistant against decomposition. The lowered pH, locally developed by bacterial activities inside the embryos, was another potential factor for the precipitation of apatite.

本文言語英語
ページ(範囲)5-17
ページ数13
ジャーナルFossils
84
出版ステータス出版済み - 10 2008

All Science Journal Classification (ASJC) codes

  • 古生物学

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