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矿床地质  2011 

内蒙古半拉山钼矿LA-ICP-MS锆石U-Pb与辉钼矿Re-Os年龄及其成矿动力学背景

Keywords: 地球化学,爆破角砾岩型钼矿床,LA-ICP-MS,锆石U-Pb年龄,辉钼矿Re-Os同位素,半拉山钼矿,西拉沐沦钼多金属成矿带

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Abstract:

内蒙古阿鲁科尔沁旗半拉山钼矿床位于大兴安岭南段,是新发现的中型爆破角砾岩型钼矿床。半拉山钼矿区内流纹岩围岩和花岗斑岩岩脉的LA-ICP-MS锆石U-Pb年龄分别是(157.5±3.3)Ma和(126.3±2.1)Ma,而辉钼矿样品的Re-Os同位素等时线年龄为(136.1±6.6)Ma(MSWD=0.42),表明成矿作用与流纹岩或花岗斑岩岩脉没有直接的成因联系,成矿侵入体在矿区深部,这一认识与野外地质考察结果一致。本文研究结果和大兴安岭南段岩浆热液矿床的成矿年代学资料显示大规模成岩成矿作用发生在150~130Ma,即晚侏罗世与早白垩世之交,构造背景是中亚造山带古生代地壳增生和三叠纪—侏罗纪碰撞加厚之后的太平洋板块俯冲有关的弧后伸展。半拉山钼矿床爆破角砾岩矿床类型的确定表明,爆破角砾岩型钼矿化之下可能存在斑岩型钼矿化,值得进一步勘查。

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