The Reef Complexes of Ningqiang Formatio Telychian, Ningqiang-Guangyuan Area

Li Yue; Chen Xu

The uplifting of whole Yangtze platform occured by the end of Llandovery (Telychian), execpt sev-eral bays around the margin of the platform. The Ningqiang Formation consists of more than 2000 m shales and limestones with faunas form upper griestoniensis Zone to spiral is-grandis Zone. The limestones within this unit may be subdivided into 8 stages according to their origination in ascending order. Reef complexes developed at differentsites on limited carbonate platforms. Reefs, biostromes and lime-mud-mounds cropped out in the different subfacies of the reef complexes. The important reef complexes'building organisms include corals, bryozoans, pelmatozoans, algea and stromatoporoids, and the at tach-ing- reefal organisms are brachiopoda, nutiloidea, trilobite, etc.. The features of the reefal organisms are changable in temporal and spatial distribution. Analysis of typical reef complexes indicate that they are variable in association, shape and growth process. The termination of all limited platforms and reef com-plexes depends on the covering of mudstones.

Nanjing Institute of Geology and Palaeotology, Chinese Academy of Sciences, Nanjing 210008

Received Date: 1997-09-24

Rev Recd Date: 1998-01-20

Publish Date: 1998-12-10

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Abstract: The uplifting of whole Yangtze platform occured by the end of Llandovery (Telychian), execpt sev-eral bays around the margin of the platform. The Ningqiang Formation consists of more than 2000 m shales and limestones with faunas form upper griestoniensis Zone to spiral is-grandis Zone. The limestones within this unit may be subdivided into 8 stages according to their origination in ascending order. Reef complexes developed at differentsites on limited carbonate platforms. Reefs, biostromes and lime-mud-mounds cropped out in the different subfacies of the reef complexes. The important reef complexes'building organisms include corals, bryozoans, pelmatozoans, algea and stromatoporoids, and the at tach-ing- reefal organisms are brachiopoda, nutiloidea, trilobite, etc.. The features of the reefal organisms are changable in temporal and spatial distribution. Analysis of typical reef complexes indicate that they are variable in association, shape and growth process. The termination of all limited platforms and reef com-plexes depends on the covering of mudstones.

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Reference (17)

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The Reef Complexes of Ningqiang Formatio Telychian, Ningqiang-Guangyuan Area

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