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矿床地质  2003 

西藏冈底斯东段斑岩铜钼铅锌成矿系统的发育时限:帮浦铜多金属矿床辉钼矿Re-Os年龄证据

Keywords: 地球化学,Re-Os年龄,斑岩型矿床,铜多金属矿床,帮浦,冈底斯,西藏

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Abstract:

通过对西藏冈底斯成矿带东段的帮浦矿床中的辉钼矿进行Re-Os精确测年,首次获得北矿带的铜多金属矿化时间。其Re-Os模式年龄为(14.30±0.25)Ma~(14.75±0.28)Ma,5件样品得到的187Re-187Os等时线年龄为(15.32±0.79)Ma。年龄数据与冈底斯成矿带东段南侧斑岩铜矿化带的矿化时间(14Ma左右)具有一致性,表明北矿带的成矿作用与斑岩有关。斑岩成矿是冈底斯成矿带内的一次主导成矿事件,冈底斯南矿带以斑岩型铜钼矿床为主,其北矿带以斑岩型铜铅锌多金属矿床为主。冈底斯南、北矿带的成矿作用具有统一的成矿动力学背景,发生在碰撞造山带侧向伸展时期,均为陆_陆碰撞造山带演化过程中同构造岩浆活动期的产物。

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