西北地质2012，Vol.45Issue(4)：229-241,13.
东昆仑祁漫塔格白干湖-戛勒赛矿带成岩成矿时代及钨锡成矿作用
Genesis and Chronology of Baiganhu-Jialesai W-Sn Mineralization Belt, Qimantage, East Kunlun Mountain, NW China
摘要
Abstract
The small intrusions consist of oligoclase granites are closely related with W-Sn mineralization in Baiganhu-Jialesai mineralization belt. The results of LA-ICP-MS U-Pb isotope dating show that oligoclase granite containing tungsten and tin ores was formed in 429. 5±3. 3 Ma. The εHf (t) values of oligoclase granite vary from -11. 05 to 7. 40 with average of -1. 26, and the peak value of T2dm vary from 944 Ma to 2 111 Ma with average of 1 492 Ma. Because of crystal fractionation and fluid activity during the latest stage of magma evolution, geochemical data of oligoclase granite are characterized with rich Rb, Cs, Nb and Sn, depleted Ba, Zrt Hf, Th, Sr, Ti, V and La. The granites in Baiganhu-Jialesai mineralization belt were derived from the melting of ancient felsic crust because of mantle underplating during the extension environment, and oligoclase granite was formed in the latest stage of magma evolution. There are two ore-forming stages in Baiganhu W-Sn deposit. In the first stage, during the intruding process of magmas containing tungsten and tin into wall rocks in early Silurian period, the batholith consist of monzonite granite was formed in deep, and small intrusions consist of oligoclase granites were formed in shallow. Then, the skarn-type and greisen-type tungsten ore bodies were formed in the top and contact belt of the small intrusions- In the second stage, after the fluid of latest magma evolution leaching metals from wall rocks, such as W and Sn,the quartz-veined tungsten ore bodies were formed along the fissures.关键词
锆石U-Pb定年/Hf同位素/矿床成因/白干湖-戛勒赛钨锡矿带/祁漫塔格Key words
zircon U-Pb dating/ Hf isotope/ genesis of the deposit/ Baiganhu-Jialesai W-Sn mineralization belt/ Qimantage分类
天文与地球科学引用本文复制引用
高永宝,王亚磊,李文渊,李侃,钱兵,张照伟,周安顺,吴玉诗,张江伟,郭周平..东昆仑祁漫塔格白干湖-戛勒赛矿带成岩成矿时代及钨锡成矿作用[J].西北地质,2012,45(4):229-241,13.基金项目
中国地质调查局地质调查项目(1212011121088、1212011121092、1212011120183和1212011220897)、国家自然科学基金项目(41102050)、"十一五"国家科技支撑计划项目(2006BAB01A01) （1212011121088、1212011121092、1212011120183和1212011220897）
