Microbialite of anoxic condition from Permian-Triassic transition in Guizhou, China

doi:10.1007/s11430-007-0033-9

	Microbialite of anoxic condition from Permian-Triassic transition in Guizhou, China
	Wu YaSheng ; Jiang HongXia ; Yang Wan ; Fan JiaSong
刊名	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
	2007-06-01
卷号	50 期号:7 页码:1040-1051
关键词	microbialites reefs Permian-Triassic boundary mass extinction end-Permian
ISSN号	1006-9313
DOI	10.1007/s11430-007-0033-9
文献子类	Article
英文摘要	Spherical microfossils are present in the Hindeodus parvus zone of the Lower Triassic in Ziyun, Guizhou Province. They generally range from 0.15 to 0.30 mm across, with micritic wall and filled by micro-sparry calcites, and are evenly scattered in micritic matrix. Their abundance makes the rock assigned to microbialites. The accompanied organisms include ostracods and algal mat, but no gastropods or bivalves. Presence of small (< 7 mu m) pyrite framboids indicates that this bed formed in anoxic conditions. In some sections, this bed is overlain and underlain by tidal-flat micritic limestone with microgastropods and small burrows. Occurrence only in deposits on reef top indicates that the microbial organism was benthic, and needed sunlight in life. The size of the microbial fossil exceeds that of any bacteria or cyanobacteria. Thus, it does not belong to these two phyla. It may belong to lower green algae, and is assigned to a new species in a new genus, Ziyunosphaeridium sinensis gen. et sp. nov. Up to now, the rocks described as microbialites from the Permian-Triassic transition include six types: (1) porous micritic limestone such as that descried from Japan by Sano and Nakashima (1997), (2) limestone with rich globular microfossils such as that described from the Nanpanjiang Basin in China by Lehrmann (1999), (3) dendroidal limestone such as that described from the vicinity of Chongqing by Kershaw et al. (1999), (4) spherical microbial limestone adapted to anoxic environments described from Ziyun, Guizhou reported in this paper, (5) limestone with cyanobacterial fossils such as that described by Wang et al. (2005), and (6) stromatolites. All these microbialites are not reefs in the proper sense, and the argument that Permian reef ecosystems extended into the Mesozoic is incorrect.
WOS关键词	GLOBAL STRATOTYPE SECTION ; SOUTH CHINA ; MASS EXTINCTION ; PALEOENVIRONMENTAL SIGNIFICANCE ; OCEANIC CONDITIONS ; NANPANJIANG BASIN ; BOUNDARY ; PROVINCE ; POINT
WOS研究方向	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000247977700009
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/67456]
专题	中国科学院地质与地球物理研究所
通讯作者	Wu YaSheng
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Wichita State Univ, Dept Geol, Wichita, KS 67260 USA
推荐引用方式 GB/T 7714	Wu YaSheng,Jiang HongXia,Yang Wan,et al. Microbialite of anoxic condition from Permian-Triassic transition in Guizhou, China[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2007,50(7):1040-1051.
APA	Wu YaSheng,Jiang HongXia,Yang Wan,&Fan JiaSong.(2007).Microbialite of anoxic condition from Permian-Triassic transition in Guizhou, China.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,50(7),1040-1051.
MLA	Wu YaSheng,et al."Microbialite of anoxic condition from Permian-Triassic transition in Guizhou, China".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 50.7(2007):1040-1051.