Petrologic evidence for sea-level drop in latest Permian in Jiangxi province, China and its meanings for the mass extinction.

	Petrologic evidence for sea-level drop in latest Permian in Jiangxi province, China and its meanings for the mass extinction.
	Wu YaSheng ; Yang Wan ; Jiang HongXia ; Fan JiaSong
刊名	ACTA PETROLOGICA SINICA
	2006-12-01
卷号	22 期号:12 页码:3039-3046
关键词	mass extinction Permian-Triassic boundary end-permian sea-level drop dedolomitization
ISSN号	1000-0569
文献子类	Article
英文摘要	A new-found Permian-Triassic boundary section in Xiushui, Jiangxi Province, China shows evidence for sea-level drop during the latest Permian. Evidence for sea-level drop was preserved in a 2.1 m thick interval of limestone, and is I m from the P-T boundary. The basal 0.1 m of this interval is a reddish sparry-cemented grainstone. The grains are rounded, dolomitized, all having a black coating. Microprobe analysis indicates that the coating is limonite, which indicates a weathering event in subaerial environments after a sea-level drop event. The internal structure of most grains has been destroyed by diagenesis. Some remained structures of foraminifers and fusulinids. So, this bed is formed before the mass extinction. The 2.0 m thick bed overlying the reddish grainstone is a dedolornitized limestone. The shapes of some original finely-erystalline dolomite rhombus were preserved. The occurrence of dedolornitization is generally related to meteorie water. So, this bed recorded a sea-level drop event. Fossils in this bed are simple: fusulinids and large foraminifers such as Colaniella are absent. It is clear that mass extinction began before this bed. The I m thick limestone between the dedolornitized bed and the P-T boundary is composed of grainstone and lime mudstone. Study of this section reached two points: (1) sea-level drop occurred in latest Permian; (2) The end-Permian mass extinction began in the earliest episode of the sea-level drop event. Thus, we cannot exclude the possibility that the mass extinction was caused by a dramatic environmental change which triggered the end-Permian sea-level drop.
WOS关键词	TRIASSIC BOUNDARY INTERVAL ; GLOBAL STRATOTYPE SECTION ; SOUTH CHINA ; PALEOENVIRONMENTAL SIGNIFICANCE ; OCEANIC CONDITIONS ; NANPANJIANG BASIN ; SICHUAN PROVINCE ; ABADEH SECTION ; MEISHAN ; RECORDS
WOS研究方向	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000245660400019
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/66776]
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,Yang Wan,Jiang HongXia,et al. Petrologic evidence for sea-level drop in latest Permian in Jiangxi province, China and its meanings for the mass extinction.[J]. ACTA PETROLOGICA SINICA,2006,22(12):3039-3046.
APA	Wu YaSheng,Yang Wan,Jiang HongXia,&Fan JiaSong.(2006).Petrologic evidence for sea-level drop in latest Permian in Jiangxi province, China and its meanings for the mass extinction..ACTA PETROLOGICA SINICA,22(12),3039-3046.
MLA	Wu YaSheng,et al."Petrologic evidence for sea-level drop in latest Permian in Jiangxi province, China and its meanings for the mass extinction.".ACTA PETROLOGICA SINICA 22.12(2006):3039-3046.