Microfacies of a Permian calcisponge reef in Lichuan, western Hubei, South China

doi:10.1016/j.palwor.2017.05.006

	Microfacies of a Permian calcisponge reef in Lichuan, western Hubei, South China
	Liu, Ling 1,2; Wu, Ya-Sheng 1,2; Li, Yang 1,2; Liu, Qing-Song 3; Jiang, Hong-Xia 1; Liu, Hong 1,2
刊名	PALAEOWORLD
	2018-03-01
卷号	27 期号:1 页码:90-106
关键词	Microfacies Calcisponge reef Changhsingian Lichuan South China
ISSN号	1871-174X
DOI	10.1016/j.palwor.2017.05.006
文献子类	Article
英文摘要	The Lichuan Jiantianba reef is located at the platform margin between the carbonate platform and the marine trough in western Hubei, China. The water depth of this area became shallow in the late Permian Changhsingian Age, and a huge aggradation-progradation platform marginal reef developed. Based on precise field measurements and microscopic observation, this paper describes the petrological characteristics and biological assemblages of the reef in detail and distinguishes 10 microfacies: small echinoderm wackestone, sponge floatstone, bound sponge bioliestone, bound sponge framestone, large echinoderm wackestone, red algal limestone, bioclastic grainstone, dasycladales wackestone, shelly wackestone, and microbialites. Sponge floatstone and bound sponge bioliestone are defined as toppled sponge limestone. Comparisons of the petrological characteristics and biotic association of toppled sponge limestone, bound sponge framestone and bioclastic wackestone and grainstone revealed that the toppled sponge limestone and the bound sponge framestone are similar in sponge content in terms of the types and contents of reef-dwellers, except that the sponge content is slightly lower, and the preservation state is mainly toppled for the former and upright or inclined for the latter. The toppled sponge limestone is dominated by tabular calcite, and the bound sponge framestone is dominated by fibrous calcite. The bioclastic wackestone and grainstone do not contain reef-building sponge organisms, and the bioclast content is very high and often dominated by a certain class, such as echinoderms, foraminifers, green algae or shells. The toppled sponge limestone below the framework, which was classified as fore-reef breccia or bioherm bafflestone-bindstone in previous studies, should be defined as reef-core sponge limestone deposited in situ that experienced serious post-karstification. The vertical evolution of the sedimentary facies of the reef is analyzed based on the microfacies and sedimentary environment. The toppled sponge limestone and the bound sponge framestone should be classified as reef core, which is the only subfacies of the reef facies. The underlying small echinoderm wackestone should be classified as the shelf facies, whereas the overlying bioclastic wackestone and grainstone should be classified as the open platform facies. These classifications represent a modification of the sedimentary facies subdivision of the Jiantianba reef in Lichuan, Hubei Province, South China, and provide a new reference model for the subdivision of the Permian calcisponge reefs on platform margin. (C) 2017 Elsevier Ireland Ltd Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS. Published by Elsevier B.V. All rights reserved.
WOS关键词	CARBONATE ; ENVIRONMENTS ; DIAGENESIS
WOS研究方向	Paleontology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000426472500006
资助机构	National Natural Science Foundation of China(41372121) ; National Natural Science Foundation of China(41372121) ; National Natural Science Foundation of China(41372121) ; National Natural Science Foundation of China(41372121) ; National Natural Science Foundation of China(41372121) ; National Natural Science Foundation of China(41372121) ; National Natural Science Foundation of China(41372121) ; National Natural Science Foundation of China(41372121)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/83000]
专题	中国科学院地质与地球物理研究所
通讯作者	Wu, Ya-Sheng
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Bur Housing & Urban Rural Dev Zhongshan City, Zhongshan 528400, Peoples R China
推荐引用方式 GB/T 7714	Liu, Ling,Wu, Ya-Sheng,Li, Yang,et al. Microfacies of a Permian calcisponge reef in Lichuan, western Hubei, South China[J]. PALAEOWORLD,2018,27(1):90-106.
APA	Liu, Ling,Wu, Ya-Sheng,Li, Yang,Liu, Qing-Song,Jiang, Hong-Xia,&Liu, Hong.(2018).Microfacies of a Permian calcisponge reef in Lichuan, western Hubei, South China.PALAEOWORLD,27(1),90-106.
MLA	Liu, Ling,et al."Microfacies of a Permian calcisponge reef in Lichuan, western Hubei, South China".PALAEOWORLD 27.1(2018):90-106.