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矿床地质  2003 

内蒙古孟恩陶勒盖银铅锌矿床白云母Ar-Ar年龄及其意义

Keywords: 地球化学,Ar-Ar年龄,银铅锌矿床,热液矿床,孟恩陶勒盖,大兴安岭

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Abstract:

文章采用Ar-Ar同位素测年法对孟恩陶勒盖银铅锌矿云英岩化阶段形成的白云母进行了测试,获得白云母坪年龄为(179.0±1.5)Ma,等时线年龄为(182.3±3.8)Ma。这组数据近似地代表了该矿床的形成年龄,同时也显示该地区除已知的晚侏罗-早白垩世构造-岩浆-成矿作用外,还有一期重要的早侏罗_中侏罗世构造-岩浆-热液成矿事件,这也是到目前为止所获得的大兴安岭中南段热液矿床最老的成矿年龄。

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