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矿床地质  2009 

兰坪盆地连城脉状铜矿床辉钼矿Re-Os定年及其地质意义

Keywords: 地球化学,脉状铜矿,辉钼矿,Re_Os定年,逆冲推覆,兰坪盆地

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Abstract:

兰坪盆地贱金属矿床是一套独特的受逆冲推覆构造系统控制的矿床类型,连城脉状铜矿床是其重要组成之一。以往研究采用多种测年手段限定脉状铜矿成矿年龄,但结果分歧较大。本文采用辉钼矿Re-Os同位素定年方法,获得连城矿床辉钼矿的Re-Os同位素模式年龄为(48.14±0.87)Ma,等时线年龄为(49.0±1.3)Ma,初步厘定兰坪盆地热液脉型铜矿床形成于48~49Ma。结合区域地质与控矿构造分析,该矿床应为盆地西部逆冲带逆冲变形过程中的产物,由此限定兰坪盆地西部逆冲推覆的起始时间至少早于49Ma,同时佐证了兰坪盆地西部逆冲带内以Cu(_Ag)为主的成矿系统的形成发育可能早于东部逆冲推覆带内以Pb-Zn为主的成矿系统。

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