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AGE DETERMINING OF THE UPPE PRECAMBRIAN SYSTEM OF NORTHERN JIANGSU-ANHUI BY USING Sr AND C ISOTOPES

YANG Jie dong 1)2) , ZHENG Wen wu 2) , WANG Zong zhe 4) and TAO Xian cong 1) ( 1) Center of Modern Analysis, Nanjing University, Nanjing, 210093; 2) State Key Laboratory of Mineralizing Processes of Ore Deposits, Nanjing Unive  
The carbonate samples were systematically collected from the Upper Precambrian System of northern Jiangsu Anhui. The leachate was used for Sr isotopic analysis after acid leaching treatment and the whole rock samples for C isotopic analysis. Compared with evolution curve of Sr and C isotopes of the Neoproterozoic seawater presented by Shields (1999), the results show that the Upper Precambrian System of northern Jiangsu Anhui is a set of continuous strata between the Qingbaikou System in North China and the Sinian System in South China, ranging in age from 850 Ma to 700 Ma. This study further confirms the view——the Huainan biota belongs to the pre Ediacarian time.
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