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矿床地质  2012 

辽西河坎子碱性侵入杂岩体及钼多金属矿床同位素年代学研究

Keywords: 地球化学,锆石LA-ICP-MS铀-铅年龄,辉钼矿Re-Os同位素年龄,钼多金属矿床,碱性侵入杂岩体,河坎子,辽西

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Abstract:

对辽西河坎子地区与碱性杂岩体相关的钼多金属矿床进行了同位素年代学研究。所获黑云母正长花岗岩锆石LA-ICP-MSU-Pb同位素加权平均年龄为(235.3±1.0)Ma,MSWD值为0.68;河坎子钼多金属矿床内辉钼矿的Re-Os同位素等时线年龄为(224.0±1.3)Ma,MSWD值为0.72。碱性杂岩体与相关的钼多金属矿床具有密切的空间关系,两者的形成时间亦比较接近,据此可推测,河坎子碱性杂岩体与相关的钼多金属矿床均为印支期构造-岩浆作用及流体活动的产物。印支期内频繁的岩浆-热液活动为该地区内钼、铜、金多金属元素的活化、迁移、富集提供了充足的热源条件。古大陆内部伸展构造环境中的碱性岩浆作用及流体活动为钼多金属矿床的形成提供了动力、物质和流体来源。

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