西藏尼玛宋我日火山岩岩石化学特征与构造环境  

Petrochemistry and Tectonic Settings of the Volcanic Rocks of Songwori in Nima County,Tibet

作　　者：杨德明[1] 李才[1] 和钟华 郑常青[1] 

机构地区：[1]长春科技大学,130061

出　　处：《地质论评》1999年第S1期972-977,共6页Geological Review

基　　金：原地质矿产部"九五"基础研究重点项目(编号9501101-05)资助

摘　　要：西藏尼玛宋我日火山岩是笔者1996年在西藏地质调查时首次发现的。该火山岩东西向带状分布于西藏尼玛县东侧,紧邻班公湖—怒江缝合带南缘。该火山岩主要为陆相喷发的中—基性火山熔岩、火山碎屑岩,底部不整合在木嘎岗日群(J_(1-2)mg)之上。岩石化学分析表明,其为一套钙碱性系列火山岩,属冈底斯—念青唐古拉火山岛弧主要成员。Volcanic rocks of Songwori were first discovered by the authors in 1996. The volcanic rocks are distributed in an east—west belt east of Nima County,Tibet,close to the southern border of the Bangong lake—Nujiang suture zone. The volcanic rocks are dominated by intermediate—basic lava and pyroclastic rocks,discondantly overlying the Mugagr Kangri Group. Petrochemical analyses of the volcanic rocks show that they are calc-alkaline lavas and are a major member of the volcanic island-arc in the Gandise—Nyaingentanglha

关 键 词：火山岩 岩石化学特征 构造环境 尼玛宋我日 西藏 

分 类 号：P588.14[天文地球—岩石学]