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

Chen, Zhong-Qiang, Shi, Guang Rong and Yang, Wan-Rong 2003, Internal structure and paleoecology of the lower Permian Uzunbulak reef complex of the Tarim Basin, Northwest China, Facies, vol. 49, no. 1, pp. 119-134.

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Title Internal structure and paleoecology of the lower Permian Uzunbulak reef complex of the Tarim Basin, Northwest China
Author(s) Chen, Zhong-Qiang
Shi, Guang RongORCID iD for Shi, Guang Rong orcid.org/0000-0002-5126-4036
Yang, Wan-Rong
Journal name Facies
Volume number 49
Issue number 1
Start page 119
End page 134
Publisher Springer-Verlag
Place of publication Berlin, Gemany
Publication date 2003-01
ISSN 0172-9179
1612-4820
Keyword(s) Uzunbulak Reef
framework
calcisponges
Tubiphytes
Dwelling Brachiopods
Tarim Basin (Northwest China)
Permian
Summary 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 frameconstructors 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 interreef 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 backreef species preferred to live in calmwater, organic-rich muddy environments.
Language eng
Field of Research 040311 Stratigraphy (incl Biostratigraphy and Sequence Stratigraphy)
Socio Economic Objective 970104 Expanding Knowledge in the Earth Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008607

Document type: Journal Article
Collections: School of Ecology and Environment
Centre for Integrative Ecology
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