滇西谦迈地区惠民组变质火山岩特征及构造环境  

THE FEATURE AND TECTONIC ENVIRONMENT OF HUIMIH FORMATION METAMORPHIC VOLCANIC ROCK IN QIANMAI AREA,W YUNNAN

作　　者：周听全 张生泽 王巍 王志忠 ZHOU Ting-quan;ZHANG Sheng-ze;WANG Wei;WANG Zhi-zhong(Yunnan An Mining Group Company(Lud),Kunming 650224;Yunnan Exploration Institute of Deolgy&Mineral Resources,Kunming 650051)

机构地区：[1]云南黄金矿业集团股份有限公司,云南昆明650224 [2]云南省地质矿产勘查院,云南昆明650051

出　　处：《云南地质》2021年第2期148-156,共9页Yunnan Geology

基　　金：云南省1:5万下景张幅、东岗幅、南北归幅联测区域地质调查(项目编码:D2017002)。

摘　　要：滇西澜沧县谦迈地区惠民岩组(Pt_(2)h)中含有较多的绿泥片岩,这些绿泥片岩的岩石学特征和岩石地球化学特征,表明其原岩至少可分为安山岩类和流纹岩类,前者具岛弧钙碱性火山岩特征,后者具火山弧花岗岩特征,总体上看惠民岩组中变质火山岩具有岛弧火山岩的性质。另外在钠长绿泥片岩中获得473.6±6.IMa、459.5±9.2Ma和481.9±2.7Ma三个锆石LA-ICP-MS年龄值,这为该区惠民岩组的形成时代提供了新的依据。There are a lot of chloritic schist in Huimin Formation(Pt_(2)h)of Qianmai area in Lancang,W Yunnan.The lithologic character and lithochemical charater show that the original rock of them can be divided into andesite and liparite at least,the former with cale-alkali volcanie rock feature of island are;the latter with granitic feature of volcamic arc.In general speaking,the metamorphic volcanic rock in Huimin Formation is the volcanic rock of island arc.Moreover,the zircon LA-ICP-MS age values of albite-chlorite schist are 473.6±6.1Ma,459.5±9.2Ma,481.9±2.7Ma,which provide the new basis for the age of Huimimn lithologic formation.

关 键 词：惠民岩组 变岛弧火山岩 活动大陆边缘 云南澜沧谦迈 

分 类 号：P588.14[天文地球—岩石学]