NDLI: Permian–Triassic boundary microbialites (PTBMs) in southwest China: implications for paleoenvironment reconstruction

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Coral patch reef system and associated facies from southwestern Gondwana: paleoenvironmental evolution of the Oxfordian shallow-marine carbonate platform at Portada Covunco, Neuquén Basin, Argentina

Permian–Triassic boundary microbialites (PTBMs) in southwest China: implications for paleoenvironment reconstruction

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Permian–Triassic boundary microbialites (PTBMs) in southwest China: implications for paleoenvironment reconstruction

Content Provider	Springer Nature Link
Author	Tang, Hao Kershaw, Stephen Liu, Hong Tan, Xiucheng Li, Fei Hu, Guang Huang, Cheng Wang, Lichao Lian, Chengbo Li, Ling Yang, Xuefei
Copyright Year	2016
Abstract	Permian–Triassic boundary microbialites (PTBMs) are commonly interpreted to be a sedimentary response to upwelling of anoxic alkaline seawater and indicate a harsh marine environment in the Permian–Triassic transition. However, recent studies propose that PTBMs may instead be developed in an oxic environment, therefore necessitating the need to reassess the paleoenvironment of formation of PTBMs. This paper is an integrated study of the PTBM sequence at Yudongzi, northwest Sichuan Basin, which is one of the thickest units of PTBMs in south China. Analysis of conodont biostratigraphy, mega- to microscopic microbialite structures, stratigraphic variations in abundance and size of metazoan fossils, and total organic carbon (TOC) and total sulfur (TS) contents within the PTBM reveals the following results: (1) the microbialites occur mainly in the Hindeodus parvus Zone but may cross the Permian–Triassic boundary, and are comprised of, from bottom to top: lamellar thrombolites, dendritic thrombolites and lamellar-reticular thrombolites; (2) most metazoan fossils of the microbialite succession increase in abundance upsection, so does the sizes of bivalve and brachiopod fossils; (3) TOC and TS values of microbialites account respectively for 0.07 and 0.31 wt% on average, both of which are very low. The combination of increase in abundance and size of metazoan fossils upsection, together with the low TOC and TS contents, is evidence that the Yudongzi PTBMs developed in oxic seawater. We thus dispute the previous view, at least for the Chinese sequences, of low-oxygen seawater for microbialite growth, and question whether it is now appropriate to associate PTBMs with anoxic, harsh environments associated with the end-Permian extinction. Instead, we interpret those conditions as fully oxygenated.
Starting Page	1
Ending Page	23
Page Count	23
File Format	PDF
ISSN	01729179
Journal	Facies
Volume Number	63
Issue Number	1
e-ISSN	16124820
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-11-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Permian–Triassic boundary microbialites (PTBMs) Conodont Anoxic upwelling Redox condition Early Triassic recovery Yudongzi Southwest China Sedimentology Biogeosciences Geochemistry Paleontology Ecology
Content Type	Text
Resource Type	Article
Subject	Geology Stratigraphy Paleontology

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