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.
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)
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)。
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
Huimin Lithologic Formation
Metamprphe Volcanic Rock of Island Are
Active Land Margin
Qianmai,Lancang,Yunnan
