滇西昌宁阿愿山花岗岩锆石U-Pb年代学特征及其地质意义  

Zircon U-Pb Dating of Ayuanshan Granite and Its Geological Implication in Changning,Western Yunnan

作　　者：杨明辉[1] 王国芝[1] 李娜[1] 龙腾[1] 唐鑫[1] 

机构地区：[1]成都理工大学地球科学学院,成都610059

出　　处：《科学技术与工程》2015年第31期136-140,153,共6页Science Technology and Engineering

基　　金：中国地质调查局1:5万鸡街等四幅区域地质调查(1212011220389)资助

摘　　要：采用LA-MC-ICPMS锆石U-Pb测年方法,确定了阿愿山花岗岩体的形成时代。研究表明,阿愿山花岗岩体锆石U-Pb年龄为(238±1)Ma。岩体所具有的岩相分带和冷凝边,表明岩体与围岩间为侵入接触关系。由岩体的侵位年龄、围岩的岩石组合共同限定有时代有争议的围岩可能属于无量山岩群。The formation age of the granite rock mass of the Ayuanshan is determined by the method of LA-MCICPMS U-Pb dating. The research shows that the zircon U-Pb ages of the body of Ayuanshan granite are（ 238 ± 1）Ma. The rock mass has the lithofacies zoning and the condensation side,which indicates that the rock mass and the surrounding rock are intrusive contact relationship. The wall rock of the controversial age that was limited by the intrusion age of rock mass and the rock associations of wall rock may belong to rock group of Wuliangshan.

关 键 词：花岗岩 U-PB年代学 无量山岩群 

分 类 号：P597[天文地球—地球化学]