新疆东昆仑祁漫塔格地区上三叠统火山岩岩石成因初探  

PETROLOGIC CHARACTERISTICS AND TECTONIC SETTING OF VOLCANIC ROCKS FROM UPPER TRIASSIC SYSTEM IN THE QIMANTAGE REGION IN EAST KUNLUN OROGENIC BELT, XINJIANG

作　　者：沈远超[1] 王岳军[2] 

机构地区：[1]中国科学院地质研究所,北京100029 [2]中国科学院长沙大地构造研究所,长沙４１０００１３

出　　处：《大地构造与成矿学》1999年第1期50-58,共9页Geotectonica et Metallogenia

基　　金："九五"国家科技攻关305项目

摘　　要：新疆东昆仑祁漫塔格地区分布着一套上三叠统、喷发韵律明显的陆相火山岩和火山碎屑岩，它们起源于地下深部富集稀土元素的异常地幔，经历了一次从基性－中性－酸性的岩浆连续演化过程，是东昆仑构造演化转折期的产物。In the southeast of the Qimantage region in east Kunlun orogenic belt, there are a series ofvolcanic rocks which have the obviously eruptive rhythmicity. In rare earth element geochemistry,all the rocks are characterized by the light-REE-enriched pattern, and with the increasing of thecontent of SiO2, the negative Eu anomaly has become obvious. Based on the petrological and geo-chemical results, we proposed that the volcanic series had been derived from the anomalous mantlewhich had been enriched by rare earth element, and had experienced the evolution from the basic,the neutral to the acidic magma.

关 键 词：火山岩系列 异常地幔 岩石成因 上三叠统 

分 类 号：P588.14[天文地球—岩石学]