Microbialites in the Permian-Triassic boundary interval in Central China: Structure, age and distribution

	Microbialites in the Permian-Triassic boundary interval in Central China: Structure, age and distribution
	Kershaw, S ; Guo, L ; Swift, A ; Fan, JS
刊名	FACIES
	2002
卷号	47 页码:83-89
关键词	microbialites thrombolite stromatolite Hindeodus parvus mass extinction China Permian-Triassic boundary
ISSN号	0172-9179
文献子类	Article
英文摘要	A carbonate crust, with a principally digitate structure, caps latest Permian reef complexes in east Sichuan, China. The crust contains the conodont Hindeodus parvus, confirming its age as earliest Triassic; it therefore closely postdates the end-Permian mass extinction, and is related to associated palaeoenvironmental change. Although its branches have lobate margins, and internal structures of radial fabrics and lobate fabrics in different specimens, an organic origin cannot be confirmed, because crust fabric is largely recrystallised. Therefore we apply the term ?microbialite to reflect uncertainty of its nature. The crust is co-eval (within the parvus Zone) with confirmed microbial biostromes and mounds in Guizhou Province, south of Sichuan. The sum of evidence, assembled by workers in several sites worldwide, indicates a sea-level rise occurred in the boundary interval, and this is corroborated by facies of the Sichuan crust. Abrupt appearance and disappearance of the crust, formed by precipitated carbonates, in east Sichuan, represents short-lived unusual post-extinction marine conditions which were switched abruptly on, then off. Microbial deposits overlying the P/T boundary in other locations in the Tethys Ocean (Iran and Japan) support the view that the unusual oceanic conditons had at least a regional distribution. Because the crust abruptly terminates, and is not succeeded by fossil-rich deposits, application of the disaster biota concept is inappropriate; an environmentally-driven control on carbonate precipitation is better supported by the evidence, whether or not it was biotically-mediated.
WOS关键词	SOUTH CHINA ; NANPANJIANG BASIN ; MASS EXTINCTION ; BIOTIC CRISIS ; CARBONATE ; FACIES
WOS研究方向	Geology ; Paleontology
语种	英语
出版者	INSTITUT PALAONTOLOGIE UNIVERSITAT ERLANGEN-NURNBERG
WOS记录号	WOS:000178722600005
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/77991]
专题	中国科学院地质与地球物理研究所
通讯作者	Kershaw, S
作者单位	1.Brunel Univ, Dept Geog & Earth Sci, Uxbridge UB8 3PH, Middx, England 2.Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England 3.Univ Leicester, Dept Geol, Leicester LE1 7RH, Leics, England 4.Chinese Acad Sci, Inst Geol, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Kershaw, S,Guo, L,Swift, A,et al. Microbialites in the Permian-Triassic boundary interval in Central China: Structure, age and distribution[J]. FACIES,2002,47:83-89.
APA	Kershaw, S,Guo, L,Swift, A,&Fan, JS.(2002).Microbialites in the Permian-Triassic boundary interval in Central China: Structure, age and distribution.FACIES,47,83-89.
MLA	Kershaw, S,et al."Microbialites in the Permian-Triassic boundary interval in Central China: Structure, age and distribution".FACIES 47(2002):83-89.