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Carbon and Oxygen Isotopes Characteristics of the Strata Containing Chaohusaurus Fauna in Lower Triassic in Chaohu Area,Anhui Province and Its Palaeoenvironmental Significance

Zhang Yuying;Jiang Dayong;He Zhiliang;Gao Bo;Li Yuchao;School of Energy Resources,China University of Geosciences(Beijing);State Key Laboratory of Shale Oil and Gas Enrichment Mechanismes and Effective Development,SINOPEC;Key Laboratory of Shale Oil/Gas Exploration and Production,SINOPEC;Petroleum Exploration and Production Research Institute,SINOPEC;School of Earth and Space Sciences,Peking University;Geological Survey Institute of Liaoning Province;  
The environment in Chaohu area,Anhui Province experienced a regression from deep basin to the outer ramp in Spatian,Early Triassic.With the test results of carbon and oxygen isotopes,this paper analyses preliminarily the palaeoenvironment of Middle-Upper Member of the Nanlinghu Formation(Lower Triassic)containing Chaohusaurus Fauna.The values of theδ13C in Middle-Upper Member of the Nanlinghu Formation of Majiashan outcrop are generally low in the whole of the carbon isotope curves,changing from-7.312‰to 3.936‰,with the rangeability 11.248‰and average value-0.857‰.This shows the environment where the Chaohusaurus Fauna lived contains few organisms and species with low biological primary productivity.Moreover,the values of theδ18 O are generally low,from-12.081‰to-3.545‰,with the rangeability-8.536‰and average value-6.598‰,as well.This probably means high seawater temperature in Spathian lengthened the high temperature in the end of Smithian.Through analysis of the sedimentary and carbon and oxygen isotopes characteristics,the paper suggests that Chaohusaurus Fauna lived in quiet outer ramp-deep basin,which was in low primary productivity and high temperature.
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