内蒙古乌兰呼都格地区发现奥陶纪岩浆事件--来自碱长花岗岩锆石U-Pb年龄的证据

Discovery of the Ordovician Magmatic Event in the Ulan Huduge Region,Inner Mongolia--Evidence from Zircon U-Pb Age of Alkali-Feldspar Granite

本次在内蒙古阿拉善左旗乌兰呼都格地区发现晚奥陶世碱长花岗岩,通过锆石U-Pb测年,其谐和年龄为(450.5±2.4)Ma。这是在该地区首次发现奥陶纪岩浆岩,为华北板块北缘西段的构造演化提供了基础资料。

The Late Ordovician alkali-feldspar granite is found in the Ulan Huduge area,Alxa Zuoqi,Inner Mongolia.Zircon U-Pb dating of the alkali-feldspar granite gives concordia ages of 450.5±2.4 Ma which provides basic information for the tectonic evolution of the western segment of the northern margin of the North China plate.