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中甸春都铜矿区岩体成岩时代及地质意义

, PP. 307-314

Keywords: 成岩时代,地质意义,闪长玢岩,花岗闪长斑岩,春都铜矿,云南中甸

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Abstract:

春都斑岩铜矿床位于中甸铜多金属成矿带的西带南段,矿区主要出露由闪长玢岩和花岗闪长斑岩组成的复式岩体,后者呈岩枝或岩脉产于闪长玢岩体中,并与斑岩铜矿有密切成因关系。本文应用LA?ICP?MSU?Pb定年方法,对闪长玢岩以及花岗闪长斑岩的锆石进行年代学研究。结果表明:岩石中的锆石颗粒为浅黄色?无色透明,呈正方双锥状、柱状的自形晶体,内部发育完好的韵律环带,并具较高的Th/U比值,属典型的岩浆成因锆石;主岩体――闪长玢岩体中的锆石LA?ICP?MSU?Pb年龄为(212±3)Ma,成矿花岗闪长斑岩锆石LA?ICP?MSU?Pb年龄分别为(217±2)Ma和(218±2)Ma。锆石LA?ICP?MSU?Pb年龄数据与地质体穿切关系的矛盾,可能与测试数据较少等因素有关。我们认为,矿区斑岩铜矿的成岩成矿时代均为晚三叠世,与义敦岛弧在237~208Ma之间发生大规模的岛弧岩浆活动相吻合。

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