Internal structure and paleoecology of the Lower Permian Uzunbulak reef complex of the Tarim Basin, Northwest China

	Internal structure and paleoecology of the Lower Permian Uzunbulak reef complex of the Tarim Basin, Northwest China
	Chen, ZQ ; Shi, GR ; Yang, WR
	2003
发表期刊	FACIES
ISSN	0172-9179
卷号	49 页码:119-134
摘要	The internal construction and biotic communities of the Uzunbulak reef of the northwestern Tarim Basin are studied for the first time. The reef was built during the Sakmarian, while the reef substrate and capping beds are of latest Asselian and earliest Artinskian ages, respectively. The reef substrate beds are composed of skeletal and oncoid grainstone. Those fusulinid-dominated skeletal shoals and oncoid banks indicate a high-energy environment and produced local topographic highs on which the reef grew. Reef framework consists mainly of calcisponge bafflestone, calcisponge-Thartharella framestone, and Tubiphytes, Archaeolithoporella and Girvanella boundstones. Calcisponges were the primary frame constructors that baffled high-energy currents. Archaeolithoporella, Tubiphytes, Girvanella and possibly microbes acted as the primary binders for the boundstone framework. Fusulinids and brachiopods were common reef dwellers. The inter-reef facies sediments are composed of skeletal-crinoid wackestone-packstone. Most of bioclasts have thick, micritized envelopes. The back-reef facies deposits consist of alternating skeletal packstone to wackestone and black shale. Sea-level fluctuations were probably accountable for the reef growth and demise. Of the reefal dwellers, brachiopods are extraordinarily abundant in Uzunbulak. They are assignable to five distinctive associations, one each from the reef substrate, framework and inter-reef facies, respectively, and two from the reef capping facies. The brachiopods in the substrate beds were mostly attached to hard substrates by a pedicle, while a few species rested on soft substrates by support of halteroid spines. Cementation of the ventral valve on hard substrates characterizes attachment of the reef framework brachiopods. All inter-reef species were anchored into the substratum comprising hard material by a strong pedicle. Back-reef brachiopods dominantly rested on the soft substrates by support of halteroid spines. The framework brachiopods had the strongest wave-resistant capability; those from both substrate and inter-reef facies were moderately capable of withstanding agitation; and the back-reef species preferred to live in calmwater, organic-rich muddy environments.
关键词	Uzunbulak reef framework calcisponges Tubiphytes dwelling brachiopods Tarim Basin (Northwest China) Permian
语种	英语
关键词[WOS]	GUADALUPE MOUNTAINS ; NEW-MEXICO ; NW CHINA ; WESTERN CHINA ; CAPITAN REEF ; SOUTH CHINA ; MUD-MOUNDS ; TEXAS ; TUBIPHYTES ; HISTORY
WOS研究方向	Geology ; Paleontology
WOS类目	Geology ; Paleontology
WOS记录号	WOS:000187615400008
出版者	SPRINGER
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/1129
专题	中国科学院南京地质古生物研究所
通讯作者	Chen, ZQ
作者单位	1.Tohoku Univ, Inst Geol & Palaeontol, Sendai, Miyagi 9808578, Japan 2.Deakin Univ, Sch Ecol & Environm, Burwood, Vic 3125, Australia 3.Chinese Acad Sci, Nanjing Inst Geol & Paleontol, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Chen, ZQ,Shi, GR,Yang, WR. Internal structure and paleoecology of the Lower Permian Uzunbulak reef complex of the Tarim Basin, Northwest China[J]. FACIES,2003,49:119-134.
APA	Chen, ZQ,Shi, GR,&Yang, WR.(2003).Internal structure and paleoecology of the Lower Permian Uzunbulak reef complex of the Tarim Basin, Northwest China.FACIES,49,119-134.
MLA	Chen, ZQ,et al."Internal structure and paleoecology of the Lower Permian Uzunbulak reef complex of the Tarim Basin, Northwest China".FACIES 49(2003):119-134.