西昆仑山北部早古生代构造－岩浆带的发现  

A DISCOVERY OF AN EARLY PALEOZOIC TECTONOMAGMATIC BELT IN THE NORTHERN PART OF WEST KUNLUN MOUNTAINS

作　　者：许荣华[1] 张玉泉 谢应雯 陈福坤 张巧大[1] 赵敦敏[1] 

机构地区：[1]中国科学院地质研究所,中国科学院广州地质新技术研究所,中国地质科学院地质研究所

出　　处：《地质科学》1994年第4期313-328,共16页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金;中国科学院重点资助;法国科研中心合作研究项目

摘　　要：１９８７年以来，先后做了４条横穿昆仑山的综合路线地质调查。它们是：中－巴公路沿线；新－藏公路沿线；于田县普鲁村－苏巴什－硫磺达坂路线；青海茫崖镇－祁曼塔格路线。在西昆仑山北部的调查区内，都有钙－碱性的深成岩体出露。通过对这些岩体系统地做Ｕ－Ｐｂ、Ａｒ－Ａｒ及Ｒｂ－Ｓｒ定年研究，发现它们具有早古生代年龄（３８４—４８０Ｍａ），延伸上千公里，形成于活动大陆边缘或碰撞后的构造环境，常与属于蛇绿岩套的组分相伴生。这充分说明在青藏高原内部存在一条新发现的缝合带。Since 1987, totally four integrated geological investigation profiles across the West Kunlun Mountains were performed. They are: (1)Profile along the Sino-Pakistan highway (from Kashigar to Kunjirap Pass); (2)Profile along the XinjiangXizang highway .(from Yecheng to Shiquanhe); (3) Pulu Village, Yutian CountySubaxi-Liuhuang Pass profile, and(4) Mangnai Town, Qinghai-Qimantaga-Muzhtaga peak profile. In the investigation region, in the northern part of the West Kunlun Mountains calc-alkaline plutonic rocks are exposed. Systematical geochronological studies of the plutonic rocks have been done, in the paper 5 U-Pb dating on the zircons,3 Ar-Ar dating on the honblende and biotites and 5 Rb-Sr dating on the wholerocks and minerals from the plutons are reported. These results enabled us to find an early Paleozoic (384-480Ma) tectono-magmatic belt, extending for a thousandof kilometers. It was formed on an active continental margin or in a postcollisional tectonis envionment, and is accompanied with a complex belonging to ophiolite suit in Kudi, Subaxi and Oy ag area. It is a newly found and defined suture zonein the interior of the Qinghai-Xizang Plateau.

关 键 词：昆仑山 花岗岩类 构造-岩浆带 缝合带 早古生代 

分 类 号：P588.121[天文地球—岩石学] P548.2[天文地球—地质学]