Earliest Cambrian fossil embryos and their fossilization processes and paleoceanographic background

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)5-17
Number of pages13
JournalFossils
Issue number84
Publication statusPublished - Oct 2008
Externally publishedYes

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fossilization
embryo
fossil
apatite
animal
upwelling
carbonate
sedimentary structure
oxic conditions
depositional environment
bottom water
microbial activity
lipid
phosphate
decomposition
fauna
membrane
energy
trend

All Science Journal Classification (ASJC) codes

  • Palaeontology

Cite this

Kunimitsu, Y., Kano, A., Yasui, K., Shu, D., Han, J., & Hua, H. (2008). Earliest Cambrian fossil embryos and their fossilization processes and paleoceanographic background. Fossils, (84), 5-17.

Earliest Cambrian fossil embryos and their fossilization processes and paleoceanographic background. / Kunimitsu, Yoko; Kano, Akihiro; Yasui, Kinya; Shu, Degan; Han, Jian; Hua, Hong.

In: Fossils, No. 84, 10.2008, p. 5-17.

Research output: Contribution to journalArticle

Kunimitsu, Y, Kano, A, Yasui, K, Shu, D, Han, J & Hua, H 2008, 'Earliest Cambrian fossil embryos and their fossilization processes and paleoceanographic background', Fossils, no. 84, pp. 5-17.
Kunimitsu Y, Kano A, Yasui K, Shu D, Han J, Hua H. Earliest Cambrian fossil embryos and their fossilization processes and paleoceanographic background. Fossils. 2008 Oct;(84):5-17.
Kunimitsu, Yoko ; Kano, Akihiro ; Yasui, Kinya ; Shu, Degan ; Han, Jian ; Hua, Hong. / Earliest Cambrian fossil embryos and their fossilization processes and paleoceanographic background. In: Fossils. 2008 ; No. 84. pp. 5-17.
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