地质与勘探2017，Vol.53Issue(2)：300-309,10.
西藏古堆地区煌斑岩地球化学特征及其构造意义
Geochemical Characteristics and Tectonic Significance of Lamprophyre in the Gudui Area of Tibet
摘要
Abstract
In recent years,many scholars have studied lamprophyre,while little attention has focused on this rock in southern Tibet.This article presents a study of the lamprophyretbe from the Gudui area of southern Tibet on its main elements,rare earth and trace elements in the south Tibetan to further understand the tectonic evolution of the environment there.The results show that the content of SiO2 in the lamprophyre is 32.99％ ～ 52.62％,41.39％ on average;K2 O/Na20 is 0.01 ～ 2.31,with average 0.73,representing an alkali basalt series.Rock geochemical characteristics show en richment in large ion lithophile elements (such as K,Ba),relative loss of high field strength elements (such as Ta,Zr),and the high field strength element Nb is relatively rich.Mantle source characterizes the genesis of the lamprophyre,which was formed in the Neo-Tethys after the extension of the lithosphere,which made the lithospheric thinning,mantle material upwell,and crustal material contamination.关键词
煌斑岩/岩石地球化学特征/构造环境/古堆/西藏Key words
lamprophyre/rock geochemical characteristics/tectonic environment/Gudui/Tibet分类
天文与地球科学引用本文复制引用
袁和,罗先熔,李武毅,陈武..西藏古堆地区煌斑岩地球化学特征及其构造意义[J].地质与勘探,2017,53(2):300-309,10.基金项目
中国地质调查局西藏古堆地区金锑多金属矿产远景调查(编号:1212011121236)资助. （编号:1212011121236）
