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Early Triassic microbialites from the Changxing Region of Zhejiang Province, South China

Huang, Ya-Fei; Bond, David P. G.; Wang, Yong-Biao; Wang, Tan; Yi, Zhi-Xing; Yuan, Ai-Hua; Jia, Jia-Yuan; Su, Yu-Qi

Authors

Ya-Fei Huang

Yong-Biao Wang

Tan Wang

Zhi-Xing Yi

Ai-Hua Yuan

Jia-Yuan Jia

Yu-Qi Su



Abstract

Microbialites, often considered as a signal of extreme marine environment, are common in the Lower Triassic strata of South China where they flourished in the aftermath of the end-Permian mass extinction. Early Triassic microbialite facies are known to vary palaeogeographically, perhaps due to differing climates, ocean chemistry, and water depths. This paper provides the first record of a brief, but spectacular development of microbialites in the aftermath of the end-Permian mass extinction at Panjiazhuang section, Changxing Region of Zhejiang Province (eastern South China). Here, the Upper Permian Changxing Formation comprises typical shallow platform facies rich in calcareous algae and foraminifera, the development of which was terminated by the major end-Permian regression. A 3.4-m-thick microbialite began to form at the onset of the transgression in the earliest Triassic. The microbialite at Panjiazhuang section is composed of thrombolite that contains abundant calcified cyanobacteria, small gastropods, microconchid tubes and ostracods, representing a low-diversity shallow marine community in the aftermath of the end-Permian crisis. The microbialites are succeeded by thin-bedded micrites bearing thin-shelled bivalves, which record a rapid sea-level rise in the Early Triassic. Abundant populations of small pyrite framboids are observed in the upper part of the microbialites and the overlying thin-bedded micrites, suggesting that dysoxic water conditions developed at that time. The appearance of microbialites near the Permian–Triassic boundary (PTB) at Panjiazhuang section was the result of peculiar marine conditions following the end-Permian regression, whilst their disappearance was due to the increasing water depth and the development of dysoxia.

Journal Article Type Article
Publication Date 2019-12
Journal Journal of Palaeogeography
Print ISSN 2095-3836
Publisher SpringerOpen
Peer Reviewed Peer Reviewed
Volume 8
Issue 1
Article Number 22
APA6 Citation Huang, Y., Bond, D. P. G., Wang, Y., Wang, T., Yi, Z., Yuan, A., …Su, Y. (2019). Early Triassic microbialites from the Changxing Region of Zhejiang Province, South China. Journal of Palaeogeography, 8(1), https://doi.org/10.1186/s42501-019-0039-1
DOI https://doi.org/10.1186/s42501-019-0039-1
Publisher URL https://journalofpalaeogeography.springeropen.com/articles/10.1186/s42501-019-0039-1
Additional Information Received: 5 December 2018; Accepted: 7 May 2019; First Online: 30 May 2019; : The authors declare that they have no competing interests. All authors have approved this manuscript and no author has financial or other contractual agreements that might cause conflicts of interest.; : Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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© The Author(s) 2019

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