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矿床地质  2011 

黑龙江岔路口钼多金属矿床辉钼矿铼-锇同位素年龄及地质意义

Keywords: 地球化学,铼-锇同位素年龄,辉钼矿,成矿时代,斑岩型钼多金属矿床,岔路口,大兴安岭

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Abstract:

岔路口矿床是迄今为止在中国北方发现的最大规模钼多金属矿床,钼、铅锌和银的储量分别为134万t、37万t和4200t。考虑到大规模地质勘查工作仍在进行中,金属储量的增加只是个时间问题。为了进一步查明岔路口矿床的形成时间,笔者对主要钼多金属矿体8件辉钼矿样品进行了铼_锇同位素分析,所获同位素等时线年龄为(146.96±0.79)Ma(2σ),其MSWD值为1.2。鉴于辉钼矿呈浸染状和团块状分布于花岗斑岩岩株中,并且与部分黄铁矿和黄铜矿呈共生结构关系,可以推测岔路口地区钼多金属矿床及花岗斑岩的形成时间均为晚侏罗世,属燕山中期构造-岩浆活动的产物。岔路口钼多金属矿床形成时代的厘定对于提高该矿床的理论研究水平和指导隐伏金属矿床的找矿勘查工作均具有重要意义。

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