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Polybessurus-like fossils as key contributors to Permian-Triassic boundary microbialites in South China
Zhang, Xi-Yang1,2; Zheng, Quan-Feng (郑全锋)3,4; Li, Yue (李越)3,4; Yang, Hong-Qiang1,2; Zhang, Hua (张华)3,4; Wang, Wen-Qian (王文倩)5; Shen, Shu-zhong (沈树忠)5
2020-08-15
Source PublicationPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
Volume552Pages:14
Abstract

Massive occurrences of microbialites near the Permian-Triassic boundary have been interpreted as being due to benthic microbial proliferation in unusual marine conditions after the end-Permian mass extinction. Here, we present large populations of Polybessurus-like microfossils in the microbialites of the South China Craton to reveal their morphological structures, growth patterns, and ecological implications. These distinctive microfossils are composed of layered stalks and spherical endpoints. The spheroids, 20-40 mu m in diameter, comprising external thin micritic walls and internal sparry parts, are interpreted as coccoid cyanobacteria. The stalks consist of multiple "stacked-cup" micritic envelopes consisting of micron-sized magnesian calcite/dolomite grains and are catalogued as calcified remains of coccoid cyanobacterial extracellular polymeric substances (EPS). Early microbially mediated calcification of EPS increased the preservation potential of microfossils. The microfossils stand upright as coccoid unicells supported by the highly unidirectional secretion of EPS, revealing their benthic behaviours. The successively secreted EPS lift the cells away from the substrate, expanding their ecological niches to gain more sunlight for photosynthesis in the barren marine floor. The distinctive Polybessurus-like microfossils can be viewed both in laminae of stromatolites and in spotted/digitate clots of thrombolites, suggesting their critical roles in microbe-dominated reefs in the aftermath of the end-Permian mass extinction. The morphological features and growth patterns of the Polybessurus-like fossils resemble their Proterozoic counterpart-Polybessurus bipartitus Fairchild ex Green et al. (1987). The widespread Polybessurus-like fossils in the Permian-Triassic boundary microbialites of the South China Craton suggest pervasive retrogressive ecosystems on carbonate platforms after the largest extinction event during the Earth's history.

KeywordCoccoid cyanobacteria Calcified EPS Microbialite End-Permian extinction South China Craton
DOI10.1016/j.palaeo.2020.109770
Indexed BySCI
Language英语
WOS KeywordNANPANJIANG BASIN ; OCEANIC CONDITIONS ; GUIZHOU PROVINCE ; YANGTZE PLATFORM ; MASS EXTINCTION ; HUBEI PROVINCE ; CARBONATE ; MICROFOSSILS ; MICROSTRUCTURES ; PALEOBIOLOGY
Funding ProjectKey Research Program of Frontier Sciences, the Chinese Academy of Sciences[QYZDY-SSW-DQC023] ; Chinese Academy of Sciences[XDB18030400] ; Chinese Academy of Sciences[XDB26000000] ; National Natural Science Foundation of China[41420104003] ; National Natural Science Foundation of China[41830323] ; National Natural Science Foundation of China[41290260]
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:000538140400006
Funding OrganizationKey Research Program of Frontier Sciences, the Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/31978
Collection中国科学院南京地质古生物研究所
Corresponding AuthorZheng, Quan-Feng (郑全锋); Yang, Hong-Qiang
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, 164 West Xingang Rd, Guangzhou 510301, Peoples R China
2.Chinese Acad Sci, Innovat Acad South China Sea Ecol & Environm Engn, Guangzhou 511400, Peoples R China
3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, 39 East Beijing Rd, Nanjing 210008, Peoples R China
4.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, 39 East Beijing Rd, Nanjing 210008, Peoples R China
5.Nanjing Univ, Sch Earth Sci & Engn, 163 Xianlin Ave, Nanjing 210023, Peoples R China
Corresponding Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Recommended Citation
GB/T 7714
Zhang, Xi-Yang,Zheng, Quan-Feng ,Li, Yue ,et al. Polybessurus-like fossils as key contributors to Permian-Triassic boundary microbialites in South China[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2020,552:14.
APA Zhang, Xi-Yang.,Zheng, Quan-Feng .,Li, Yue .,Yang, Hong-Qiang.,Zhang, Hua .,...&Shen, Shu-zhong .(2020).Polybessurus-like fossils as key contributors to Permian-Triassic boundary microbialites in South China.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,552,14.
MLA Zhang, Xi-Yang,et al."Polybessurus-like fossils as key contributors to Permian-Triassic boundary microbialites in South China".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 552(2020):14.
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