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《Journal of Palaeogeography》 2014-05
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Microfacies characteristics of the Lower Triassic containing Chaohusaurus fauna in Chaohu area,Anhui Province and its palaeoenvironment

Zhang Yuying;Jiang Dayong;Fu Wanlu;Ji Cheng;Sun Zuoyu;School of Earth and Space Sciences,Peking University;Liaoning Institute of Geology and Mineral Resources;Nanjing Institute of Geology and Palaeontology,CAS;  
The Early Triassic Chaohusaurus fauna was found at No. 598- 630 layers at the top of the Middle Member- the bottom of the Upper Member of the Nanlinghu Formation in Majiashan section of Chaohu area,Anhui Province. Based on the microfacies characteristics and the carbon and oxygen isotope analysis,the sedimentary environment of the fossil beds where the Chaohusaurus fauna had occurred was studied. 4 microfacies types were recognized from the studied layers,which contained the red- grey thick nodular limestone with spicules- bivalves,the gray bioclastic-argillaceous micrite limestone,the gray laminated argillaceous micrite limestone,and the light gray micrite limestone,respectively. It was indicated that the sedimentary environment of the fossil beds was from the foot of the outer ramp- abyssal basin to the outer ramp. The values of the δ13C and δ18O are generally low in the whole of fossil beds. Combined with the above characteristics,it might be inferred that the Chaohusaurus fauna was living in the outer ramp zone with low-energy,less numbers and types of the biocoenose,and high seawater temperature.
【Fund】: 国家自然科学基金重大国际合作研究项目(编号:40920124002) 国家自然科学基金项目(编号:41372016);; 高等学校博士学科点专项科研基金(编号:20120001110072);; 现代古生物学和地层学国家重点实验室(中国科学院南京地质古生物研究所)开放基金(编号:123102)共同资助
【CateGory Index】: Q915.6;P53
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