藏北新生代火山岩系列的地球化学及成因  

GEOCHEMISTRY AND GENESIS OF CENOZOIC VOLCANIC ROCK SERIES IN NORTHERN TIBET

作　　者：刘燊[1] 迟效国[1] 李才[1] 金巍[1] 王天武[1] 

机构地区：[1]吉林大学地球科学学院,吉林长春130061

出　　处：《长春科技大学学报》2001年第3期230-235,共6页Journal of Changchun University of Science and Technology

基　　金：原地质矿产部"九五"基础研究重点项目 (95 0 110 1- 5 )资助

摘　　要：自始新世 (4 5Ma)印度板块和欧亚板块碰撞以来 ,藏北新生代火山活动相当频繁 ,在空间上自南向北随时间早晚依次形成了羌塘、可可西里和喀喇昆仑—玉门 3个火山岩带 ,依岩石组合和地球化学特征可划分为 5个火山岩系列 :①钠质碱性玄武岩系列 ;②白榴石碧玄岩 -响岩系列 ;③高钾钙碱性系列 ;④可可西里钾玄岩系列 ;⑤喀喇昆仑—玉门钾玄岩系列。通过对各系列火山岩成因的研究 ,可以作为了解新生代以来青藏高原岩石圈物质组成。Following the collision of Indian plate and Eurasia continent plate in Eocene(45Ma),the Cenozoic volcanic activity is rather frequently in northern Tibet.There are three volcanic rocks zones from south to north and from old to new Qiangtang,Hoh Xil and Karakoram-Yumen. According to rock assemblage and geochemistrical features, these zones can be divided into five series:① soda-alkalic basalt series;② leucitite basanite-phonolite series;③ high-K calc-alkaline series;④ Hoh Xil Shoshonite series and ⑤ Kalakunlun-Yumen shoshonite series.It is hoped that the study on origin of the volcanic rock series will provide significant information about lithospheric composition, crust-mantle texture, and uplifted mechanism of Qinghai-Tibet plateau.

关 键 词：新生代 火山岩 地球化学 成因 壳幔结构 青藏高原 岩石圈 时空分布 

分 类 号：P588.14[天文地球—岩石学] P59[天文地球—地质学]