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地球学报  2008 

内蒙古奥尤特铜-锌矿床绢云母40Ar-39Ar同位素年龄及地质意义

DOI: 10.3975/cagsb.2008.05.08

Keywords: 氩-氩同位素年龄,绢云母,铜-锌矿床,奥尤特,内蒙古

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Abstract:

内蒙古东乌珠穆沁旗奥尤特铜-锌矿床位于西伯利亚板块南缘的查干敖包—奥尤特—朝不楞早古生代构造岩浆带。为了获得该矿床的形成年龄,笔者首次对奥尤特矿床铜-锌矿石中的绢云母进行了40Ar-39Ar同位素年代学研究。所测样品的有效坪年龄值为(286.5±1.8)Ma(2σ),等时线年龄为(287±10)Ma(2σ),MSWD=0.45,40Ar/36Ar的初始值为284±74,等时线年龄与坪年龄在误差范围内完全一致,该结果可能代表绢云母的形成时代。详细的野外地质调查和系统的室内岩(矿)相学研究结果表明,奥尤特绢云母和铜-锌硫化物矿具有密切的成因联系,可以推测奥尤特铜-锌矿床形成于海西晚期,属海西晚期构造—岩浆活动的产物。

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