震旦系地质年代学新研究  

NEW GEOCHRONOLOGY OF SINIAN SYSTEM

作　　者：胡世玲[1] 刘鸿允[1] 劳秋元[2] 

机构地区：[1]中国科学院地质研究所,北京100029 [2]同济大学海洋地质系,上海200092

出　　处：《地质科学》1991年第4期325-336,共12页Chinese Journal of Geology(Scientia Geologica Sinica)

摘　　要：在研究中国南方震旦系的基础上,近年来对长江峡东、滇东、皖南、赣西北、川西等震旦系典型剖面及有关花岗岩体进行了系统的地质年代学研究,并参照收集到的年龄资料,对震旦系顶、底界线和分统界线年龄作了综合研究,并提出了震旦系新的地质年代表。On the basis of previous studies on the Sinian system in southern China during the last decades, the authors, using 40Ar/39Ar dating teachnique, Rb-Sr whole rock and K-Ar methods, systematically determined a large number of samples collected from several typical Sinian sections and related granitic intrusions in eastern Yangtze Gorge area, southern Anhui, northwestern Jiangxi and western Sichuan. With the reference to the available data, a comprehensive study on the geochronology of Sinian system enables us to propose that the age of the bottom boundary of Sinian system is 900±20 Ma; the boundary between Lower and Upper Sinian is 740±40 Ma; the boundary between Sinian and Cambrian is 600±10 Ma. And a geochronological scale of the Sinian system is geven in this paper.

关 键 词：同位素 年龄 地质年代学 震旦纪 

分 类 号：P597[天文地球—地球化学]