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地质学报  2009 

新疆塔城别斯托别苏长辉长岩的岩石学和锆石SHRIMP年代学研究

, PP. 1316-1326

Keywords: 苏长辉长岩,锆石,SHRIMP年代学,别斯托别,塔城,新疆

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Abstract:

塔城市南约30km的别斯托别苏长辉长岩侵入石炭纪二长花岗岩中,二者的接触部位多被农田覆盖。二长花岗岩内部存在大量辉长岩、闪长岩、花岗闪长岩、石英闪长岩、石英斑岩等包体(但没有苏长辉长岩包体)。苏长辉长岩主要由透辉石-普通辉石、顽火辉石、基性斜长石(An:51~70)和少量钛铁矿-磁铁矿组成。从苏长辉长岩中分选出的锆石CL图像显示典型的扇形结构(锆石中存在辉石和斜长石包体)。对两个锆石样品进行的SHRIMP年代学研究得到平均年龄分别为:273.3?1.8Ma(MSWD=1.18,n=20)和272.5?2.8Ma(MSWD=0.75,n=12)。这两个年龄在误差范围内完全一致,表明别斯托别苏长辉长岩的形成时代为早二叠世晚期。在该苏长辉长岩与花岗岩接触带附近观察到的铜矿化现象为找矿勘探提供了方向。

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