| 苏皖北部上元古界划分与对比的探讨 |
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| 引用本文： | 王翔,王战.苏皖北部上元古界划分与对比的探讨[J].地球科学与环境学报,1991(4). |
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| 作者姓名： | 王翔 王战 |
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| 作者单位： | 西安地质学院地质构造研究所
(王翔),西安地质学院地质构造研究所(王战) |
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| 摘 要： | 本文首次对苏皖北部地区上元古界中已有K-Ar同位素年龄出现的分散及“倒置”现象的原因作了探讨,指出大多数K-Ar年龄由多种因素造成Ar丢失,从而导致不同程度的偏新。因此,这些年龄数据不能代表本区晚元古代沉积岩的真实年龄。作者根据近几年新获得的一些Rb-Sr全岩等时线年龄数据及地壳波浪运动中表现出来的周期性特征,讨论了建立“徐淮系”的可能性及必要性。作者认为,“徐淮系”可以填补青白口系与震旦系之间至少150Ma的沉积缺失。
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| 关 键 词： | 上元古界 同位素年龄 青白口系 震旦系 “徐淮系” 地壳运动 |
A DISCUSSION ON DIVISION AND CORRELATION OF THE UPPER PROTEROZOIC IN NORTHERN JIANGSU AND ANHUJ PROVINCES |
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| Wang Xiang Wang Zhan.A DISCUSSION ON DIVISION AND CORRELATION OF THE UPPER PROTEROZOIC IN NORTHERN JIANGSU AND ANHUJ PROVINCES[J].Journal of Earth Sciences and Environment,1991(4). |
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| Authors: | Wang Xiang Wang Zhan |
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| Institution: | Xi'an College of Geology |
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| Abstract: | This paper, for the first time, discusses the reasons for discordance and "reverse" phenomenon of the K-Ar ages obtained from the upper Proterzoic in northern Jiangsu and Anhui provinces.lt is evident that most of the K-Ai ages are yunger than the true ages of the rocks.These ages,therefore, cannot represent the true ages of sedimentary rocks in this region. According to the newly obtained Rb-Sr isotopic ages and periodicity of crustal wavy motion, the authors discuss the possibility and necessity of estabishing the "Xuhuai System" , which could fulfil the lacuna ( about 150Ma ) between the Qingbaikou and Sinian Systems. |
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| Keywords: | Upper Proterozoic isotopic ages Qingbaikou System Sinian System "Xuhuai System" periodicity of crustal motion |
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