Sea-level drops in the Permian-Triassic boundary section at Laolongdong, Chongqing, Sichuan province

	Sea-level drops in the Permian-Triassic boundary section at Laolongdong, Chongqing, Sichuan province
	Wu YaSheng ; Jiang HongXia ; Liao TaiPing
刊名	ACTA PETROLOGICA SINICA
	2006-09-01
卷号	22 期号:9 页码:2405-2412
关键词	Permian-Triassic boundary end-Permian sea-level change erosional surface Sichuan
ISSN号	1000-0569
文献子类	Article
英文摘要	Restudy of the Permian-Triassic boundary section at Laolongdong, Chongqing, Sichuan Province, south China shows evidence for sea-level drops. This section comprises a basal Changhsingian calcisponge limestone of normal shallow-water condition. It is overlain by 10.6 m thick packstone of platform facies. The latter is covered by 1.4 m thick lime mudstone and packstone of restricted platform facies, which is characterized by speckled appearance. The top of this interval is an undulated ancient karstic surface. This surface is coated by a 1 mm thick layer of terrestrial clasts of quartz, feldspar, and clay minerals. The overlying 0.8 m thick packstone and lime mudstone has a characteristic dendroid appearance. This unit has a more remarkable erosional top surface. The height difference of the undulated surface at least reaches 0.3 m. The lentiform deposits in the lower areas of the surface are bedded grainstone composed of microgastropods cemented by fibrous calcite. The horizontal beddings of the grainstone are intersected with the erosional surface. The grainstone is overlain by a thin layer of packstone of small bivalves. The above rock is caesious tabular marly lime mudstone containing abundant small syndepositional pebbles 0.3 similar to 3 mm wide, which are internally recrystallined.
WOS关键词	MASS EXTINCTION ; SOUTH CHINA ; MICROBIALITE MICROSTRUCTURES ; OCEANIC CONDITIONS ; ABADEH SECTION ; HUAYING AREA ; INTERVAL ; MEGASTRUCTURES ; IRAN
WOS研究方向	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000242107400017
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/67134]
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.Chongqing Univ Sci & Technol, Chongqing 400042, Peoples R China
推荐引用方式 GB/T 7714	Wu YaSheng,Jiang HongXia,Liao TaiPing. Sea-level drops in the Permian-Triassic boundary section at Laolongdong, Chongqing, Sichuan province[J]. ACTA PETROLOGICA SINICA,2006,22(9):2405-2412.
APA	Wu YaSheng,Jiang HongXia,&Liao TaiPing.(2006).Sea-level drops in the Permian-Triassic boundary section at Laolongdong, Chongqing, Sichuan province.ACTA PETROLOGICA SINICA,22(9),2405-2412.
MLA	Wu YaSheng,et al."Sea-level drops in the Permian-Triassic boundary section at Laolongdong, Chongqing, Sichuan province".ACTA PETROLOGICA SINICA 22.9(2006):2405-2412.