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《Acta Geologica Sinica》 2015-12
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Sedimentary and Geochemical Characteristics of the Early Triassic Yinkeng Formantion at West Pingdingshan Section in Chaohu,Anhui Province

LIN Chunming;ZHANG Xia;YU Jin;LI Da;ZHANG Ni;State Kay Laboratory for Mineral Deposits Research,Nanjing University;Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education,China University of Geosciences;Department of Materials Engineering,Jinling Institute of Technology;  
In this paper,we discussed the sedimentary and diagenetic environments of the Early Triassic Yinkeng Formation at the west Pingdingshan section,Chaohu,Anhui Province,based on the detailed analyses of sedimentary sequence,mineral composition,sedimentary texture and structure,chemical components,as well as carbon and oxygen isotopes of the carbonates.The results indicate that the Yinkeng Formation contains four sedimentary facies,including the shallow open platform,upper slope,lower slope,and deep basin from bottom up,with the water depth and sea level deepening and rising,respectively.Nodular limestones,which are composed of nodules and matrix,are common in this formation.The nodule is gray or gray white micritic calcite while the matrix occurs predominantly of yellow,brown-yellow,and yellowgray calcareous mudstones.Three types of nodular limestones,namely the banded nodular limestone,discontinuous nodular limestone,and random nodular limestone,are regularly distributed in the section,which may reflect original sedimentary environment from upper slope,lower slope to deep basin,respectively,with dissolution gradually increasing,and following diagenetic intensity.In addition,theδ13C values of the carbonate in the Yinkeng Formation range from-5.97‰ to-1.17‰,displaying an obvious positive excursion with the magnitude up to 4.80‰,which may result from the biotic recovery,burial of organic matters,sea-level rising,and environmental changing.
【Fund】: 国家自然科学基金项目(编号:41272124);; 中国地质大学(武汉)构造与油气资源教育部重点实验室开放课题(编号TPR-2012-26)资助
【CateGory Index】: P534.51
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