我国某些元古宙及早寒武世碳酸盐岩石的锶同位素组成

本文报道了我国某些元古宙及早寒武世碳酸盐岩石锶同位素的测量结果，样品采自蓟县中元古界和峡东震旦－寒武系标准剖面，共４６件样品５４个测定数据。样品分析分别在澳大利亚国立大学和宜昌地质矿产研究所同位素实验室进行。取得的测定数据经空白校正和年龄校正，给出样品形成时＾８７Ｓｒ／＾８６Ｓｒ的初始值，测定中用ＮＢＳ－９８７和ＮＢＳ－６０７标准物质监探仪器状态和分析过程，得到的＾８７Ｓｒ／＾８６Ｓｒ值的精度好于

87Sr/86Sr DATA FOR SOME MIDDLE-LATE PROTEROZOIC TO EARLY CAMBRIAN CARBONATE ROCKS IN CHINA

This paper reports the results of determination of 87Sr/86Sr ratios of some Middle-Late Pro-terozoic and Early Cambrian carbonate rocks in China. The samples were collected from the standard sections of the Middle Proterozoic in Jixian and the Sinian-Early Cambrian in the East Yangtze Gorges respectively. The sample analyses were carried out in the isotopic geology laboratories in Australian National University and the Yichang Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences. The data obtained were corrected for the Rb blank and the radiogenic 87Sr from87Rb decay. Finally the initial 87Sr/86Sr ratio for the formation of the samples was given. The reference materials of NBS-987 and NBS-607 were used for monitoring the instrument condition and the analytical process. The precision of the measured 87Sr /86Sr ratio is better than 0. 03%.A brief discussion is also made on the obtained data.