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石湖金矿区麻棚岩体内发育大量暗色闪长岩包体,本文针对包体的LA-ICP-MS锆石年代学以及包体和寄主岩石的主微量、稀土元素进行了分析和讨论。研究表明(1)包体和麻棚岩体具有相似的微量、稀土元素特征,通过LA-ICP-MS锆石年代学研究得出包体与其寄主岩石在误差允许范围内具有相同的年龄,均为136.0±1.3Ma。(2)包体的形成可能为玄武质岩浆与花岗质岩浆复杂相互作用的产物。
A large number of dark-diorite inclusions are developed in the Mapeng rock body in the Shihu gold deposit. In this paper, LA-ICP-MS zircon chronologies of inclusions and main and trace elements of the host rocks and rare earth elements are analyzed and discussed . The results show that (1) the inclusions and Mapeng rocks have similar trace and rare earth elements characteristics. Based on the LA-ICP-MS zircon geochronology, it is concluded that the inclusions and their host rocks have the same age within the allowable error range 136.0 ± 1.3Ma. (2) The formation of inclusions may be the product of complex interaction between basaltic magma and granitic magma.