【摘要】 西昆仑山阿卡孜岩体是该区已知的最古老侵入体。岩体侵入于太古代赫罗斯坦群（TTG岩系）中。获得最新的单颗粒锆石SHRIMP年龄为2426±46Ma。岩石地球化学研究表明,岩石具有高碱度富K特征;∑REE为409.94×10^-6～787.76×10^-6,δEu为0.48～0.73;微量元素显示富集大离子元素。综合分析该岩体地质地球化学特征,认为该岩体形成于晚太古代～古元古代初期碰撞后拉张背景,是TTG岩系（赫罗斯坦群）重熔的结果。这对研究西昆仑山早前寒武纪陆壳增生及构造演化提供了重要的地质资料。更多还原

【Abstract】 Akazi pluton, which occurs in Western Kunlun in north of Qinghai-Tibet plateau, is the known oldest pluton in this area. It intrudes into Archean Heluositan Group (TTG). By SHRIMP method, we get 2426±46Ma age of the zircons from this pluton. Its geochemistry shows that it has high alkaline with K2 O. ∑REE ranges from 409.94×10-6 to 787.76×10-6, δEu is between 0.48 and 0.73. As for trace elements, it is riched in large ions. Synthesizing the geochemistry of the pluton, we put forward that Akazi pluton was formed at Late-Archean to Paleo-Proterozoic postcollisional extending environment. This study supplies new geological data for research of the early Precambrian crust growth and tectonic evolution of Western Kunlun.更多还原