On the Lower Ordovician Lunshan Formation in Lower Yangtze Region, South China:Its petrology, stratigraphy and palaeogeography
Li Jiateng1, Liu Jianbo1, Sun Yongchao1, Yan Zhen1, Wu Rongchang2, Zhan Renbin2
1 School of Earth and Space Sciences,Peking University,Key Laboratory of Orogenic Belts;and Crustal Evolution, Ministry of Education, Beijing 100871; 2 State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,Jiangsu
Abstract：The Lunshan Formation is one of the lowest stratigraphic units of the Lower Ordovician in the Lower Yangtze Region in South China. The formation is characterized by massive dolostone in comparison with other contemporaneous lithological units,and extends widely. A detailed analysis on the Lunshan Formation at Hongjia section of Chizhou County, Anhui Province, as well as a comprehensive review of the previous studies, indicates that the Lunshan Formation consists of dolostone,lime dolostone,dolomitic limestone,and minor,intercalated grainstone and packstone. The upper boundary of the formation is marked by the occurrence of medium- to thick-bedded bioclastic grainstone and packstone in the study area. The lower boundary of the formation is marked by occurrence of dolomitic limestone or lime dolostone in inner,northern and southeastern Lower Yangtze Region and occurrence of dolostone in most parts of southern Lower Yangtze Region. Although fossils are commonly rare in the Lunshan Formation,five conodont biozones are established in an ascending order:Monocostatus sevierensis biozone,Acanthodus lineatus-A. costatus biozone, Scolopodus? pseudoplanus biozone, Glyptoconus quadraplicatus biozone,and Paltodus deltifer-Tripodus proteus biozone, corresponding to the early Tremadocian of Early Ordovican. The Lunshan Formation was deposited in shallow subtidal to deep subtidal settings. The spatial changes in the thickness of the formation as well as those of dolostone were mainly controlled by palaeogeographic factors. The sedimentary properties of dolomite in the Lunshan Formation imply that these dolostones were mostly formed by penecontemporaneous dolomitization superimposed with moderate burial dolomitization.
Li Jiateng,Liu Jianbo,Sun Yongchao et al. On the Lower Ordovician Lunshan Formation in Lower Yangtze Region, South China:Its petrology, stratigraphy and palaeogeography[J]. JOPC, 2016, 18(3): 411-423.
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