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地质论评  2001 

嵩县祁雨沟金矿成矿时代的40Ar-39Ar年代学证据

Keywords: 40Ar-39Ar年代学,成矿时代,祁雨沟金矿

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Abstract:

采用单矿物40Ar-39Ar年代学方法,对河南祁雨沟爆破角砾岩型金矿的矿化蚀变矿物进行了高精度的定年研究.矿脉中钾长石的40Ar-39Ar年龄表明,祁雨沟金矿的主要成矿阶段发生在115~125Ma期间,成矿作用持续达10Ma.结合前人研究成果分析,区域燕山期花岗岩侵位30Ma之后祁雨沟金矿开始进入主成矿期,此时正是区域伸展构造的发育时期,深部流体活动频繁而强烈.祁雨沟金矿是中国东部金的大规模成矿作用的组成部分.

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