阿尔金山卓阿布拉克东南中晚奥陶世侵入岩地质特征及意义

摘要

According to the zircon SHRIMP U-Pb dating results (460.2±7.3) Ma～(460.2±7.3) Ma,first time indicating rocks of southeast Zhuoabulake in the aerjinshan mountians an mid-late Ordovician,and Petrological and geochemical characteristics of Island arc,indicating that the Nanhua-Ordovician oceanic crust in the Middle-Late Ordovician had southward subduction.The rock is a I-type granite, Causes of the characteristics of a crust-mantle mixed source.%据锆石SHRIMP U-Pb测年结果(460.2±7.3)～(460.2±7.3) Ma,首次将阿尔金山卓阿布拉克东南侵入岩体形成时代定为中晚奥陶世.岩石学及地球化学特征显示为岛弧型,说明南华一奥陶纪大洋壳在中晚奥陶世曾向南俯冲,岩体属Ⅰ型花岗岩,具壳幔混合源成因特点.