Microfacies of carbonate rocks and sea-level changes in the Lower to Middle Ordovician Zitai Formation of southern Anhui Province
Luan Xiaocong1,2, Liu Jianbo3, Zhan Renbin1, Wu Rongchang1
1 State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences,Nanjing 210008,Jiangsu 2 University of Chinese Academy of Sciences,Beijing 100049 3 School of Earth and Space Sciences,Peking University,Beijing 100871
Abstract：The Lower to Middle Ordovician Zitai Formation,a unique lithologic unit formed during the critical period of the Great Ordovician Biodiversification Event(GOBE),contains some important information about this major biotic event. Based on detailed investigation and sampling in the field and observation under the microscope in the lab,nine carbonate microfacies were distinguished in the Zitai Formation at Dingxiang section of Shitai County and Hongjia section of Chizhou County,southern Anhui Province,East China,named as the MF-1 calcareous shale,the MF-2 argillaceous mudstone,the MF-3 mudstone,the MF-4 gastropod-ostracod wackestone,the MF-5 calthrop-bearing wackestone,the MF-6 argillaceous bioclast-bearing wackestone,the MF-7 argillaceous bioclastic wackestone,the MF-8 bioclastic wackestone and the MF-9 bioclastic packstone. These microfacies were deposited in deep subtidal and adjacent zones with low amplitude of changes in water depths. Taking into account of some other evidences that we observed in the field,we proposed that depositional environment of the Zitai Formation at Dingxiang section was deeper than that at Hongjia section. Five transgressive events in the Zitai Formation were recognized at both sections. All these transgressions can be precisely correlated between the studied sections and the sections on the Yangtze Platform,as well as on some other palaeoplates. Thus the changes in deposition of the Zitai Formation in the Lower Yangtze region were controlled by regional and even global eustatic sea-level fluctuations.
Luan Xiaocong,Liu Jianbo,Zhan Renbin et al. Microfacies of carbonate rocks and sea-level changes in the Lower to Middle Ordovician Zitai Formation of southern Anhui Province[J]. JOPC, 2015, 17(2): 249-264.
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