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矿床地质  2011 

赣南园岭寨钼矿辉钼矿Re-Os年龄及其地质意义

Keywords: 地球化学,园岭寨钼矿,辉钼矿,Re-Os同位素,赣南

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Abstract:

赣南园岭寨钼矿为产在花岗斑岩与寻乌岩组变质岩内外接触带的大型斑岩型钼矿床。对矿区含矿石英脉中5个辉钼矿样品进行Re-Os同位素测定,获得等时线年龄及模式年龄的加权平均值分别为(161.1±3.9)Ma和(162±1)Ma。等时线初始187Os值为(0±2)ng/g,MSWD=0.50。园岭寨钼矿形成于中侏罗世中晚期,其成矿年龄对应于华南中晚侏罗世第二成矿阶段(170~150Ma),与区域内160Ma左右的钨锡矿成矿作用时间基本一致。区域上,华南钼矿的成矿时间具有连续性,在165~130Ma均有发生。

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