西藏搭格架热泉型铯矿床地质特征及形成时代  

Geological characteristics and formation age of hot spring cesium deposit in Targejia area, Tibet

作　　者：赵元艺[1] 聂凤军[1] 侯增谦[2] 李振清[1] 赵希涛[3] 马志邦[3] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]中国地质科学院地质研究所,北京100037 [3]中国科学院地质与地球物理研究所,北京100029

出　　处：《矿床地质》2006年第3期281-291,共11页Mineral Deposits

基　　金：国家科技部973项目2002CB412606课题的资助

摘　　要：文章在野外第四纪地质与地貌调查的基础上,系统研究了搭格架矿床的地质特征,并以U系法的全溶法和等时线法为主要手段,查明了矿床的成矿时代。根据泉华在野外的分布特征,将其分为6套。第Ⅰ套为灰白色钙华;第Ⅱ～Ⅵ套为硅华,主要矿物为胶状和粒状蛋白石。硅华在长马曲河流阶地的位置分别为:第Ⅱ套,T5;第Ⅲ套,T4;第Ⅳ套,T3;第Ⅴ套,T2;第Ⅵ套,T2。泉华形成于5个阶段:403～202kaB.P.;99kaB.P.;39～25kaB.P.;17～4kaB.P.;现代。The Targejia hot spring geyserite cesium deposit, located in Ang Ren County of Xigaze area, Tibet, is still very active. The size of this geyserite cesium deposit is very rare in China. The geyserite reserves of this deposit have reached the superlarge grade. In the opposite direction and in collision with each other, Indian and Eurasian plates produced the NS-trending rift valley. This deposit, located in the fracture of the Dajia Co-Dajiamang Co-Tagejia NS-trendig rift valley, is in a sheetlike high temperature （ 〉 60℃ ） area. There are two types of sinter in this ore district, namely, travertine and geyserite. The travertine is distributed in sandstone and conglomerate at the foot of the Dajia Mountain west of the spring. Geyserite is developed in the east and west of Changmaqu. The active fountain, however, is just located in the west of Changmaqu. According to the distribution land forms and characteristics, the sinter can be divided into six suites. The first suite is grayish white travertine. The others are geyserite, with the main mineral being the colloform and granular opal. The colors of the geyserite and the positions in Changmaqu are as follows： the second suite is brick red, pure white, grayish green, T5 ; the third is brick red, T4 ; the forth is grayish white, T3 ; the fifth is grayish green, T2 ; the sixth is grayish green and grayish yellow, T2. According to the U series and the previous workers＇ ESR dating results, the sinter can be assigned to five formation stages： the first stage was 403--202 ka B. P., the second stage was 99 ka B. P., the third stage was 39--25 ka B. P., the forth stage was 17--4 ka B. P., and the fifth stage refers to modem time.

关 键 词：地质学 热泉型铯矿床 U系法测年 硅华 搭格架 西藏 

分 类 号：P618.84[天文地球—矿床学]