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岩石学报  2013 

Geological characteristics and molybdenite Re-Os ages of the Baituyingzi Mo-Cu field, eastern Inner Mongolia and their geological implications
内蒙东部白土营子钼铜矿田的矿床地质特征、辉钼矿Re-Os年龄及其意义

Keywords: Molybdenite Re-Os dating,Porphyry-quartz vein type Mo-Cu deposit,Metallogenic regularities,Baituyingzi Mo-Cu field,Xilamulun molybdenum belt
辉钼矿Re-Os年代学
,斑岩型-石英脉型钼铜矿床,成矿规律,白土营子钼铜矿田,西拉沐沦钼矿带

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白土营子斑岩型-石英脉型钼铜矿田是华北板块北缘西拉沐沦钼矿带南部新近发现的与岩浆热液活动密切相关的钼铜成矿系统。本文在矿床地质特征研究的基础上,对矿田内三个重要钼铜矿床开展了辉钼矿Re-Os同位素定年,初步获得:1)白土营子斑岩型钼铜矿床的成矿年龄为248.0±10Ma(MSWD=0.52,n=6);2)白马石沟石英脉型铜钼矿的成矿年龄为248.6±6.7Ma(MSWD=1.06,n=4);3)库里吐石英脉型钼铜矿的成矿年龄为245.0±4.3Ma(MSWD=0.71,n=5);这一结果揭示该矿集区的钼铜矿化发生在早三叠世。该成矿系统的形成适值早三叠世西伯利亚板块与华北板块碰撞造山过程的晚期,二长花岗斑岩的UST结构证明含矿流体来自岩浆作用。早三叠世钼铜成矿作用在华北板块北缘及邻区有一定的普遍性,找矿前景可观。

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