查汗萨拉锑、银矿带成矿时代研究  

STUDY ON THE METALLOGENETIC TIMES OF THE CHAHANSALA Sb-Ag ORE BELT

作　　者：胡世玲[1] 满发胜[2] 倪守斌[2] 王兆荣[2] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国科学技术大学地球和空间科学系,合肥230026

出　　处：《地震地质》2000年第B12期51-62,共12页Seismology and Geology

基　　金：国家"九五"重点科技攻关项目! (新疆 30 50 4 0 4 )

摘　　要：采用常规的4 0 Ar/39Ar定年技术 ,系统地测定了新疆查汗萨拉锑、银矿带 5个矿床(点 )的成矿时代 ,它们的年龄结果不尽相同 ,整体上其成矿时代为燕山期 ,而并非前人提出的“海西期成矿”。年龄测定还表明 ,矿带中、东部的矿床成矿时代为燕山早期 ,西部矿床为燕山晚期 ,空间上呈东早西晚的变化趋势 ,并显示多期次成矿、多矿种的特征。实验证明 :对石英样品进行一些特殊处理 ,并重视对K ,Ca和Cl干扰同位素的校正 ,可获得客观、理想的年龄结果。Using the conventional 40Ar- 39Ar age dating technique, the metallogenetic times of five meneral deposits of the Chahansala Sb-Ag ore belt in Xingjiang are systematically determened. Although all values of their ages are not identical, these metallogenetic times as a whole belong to the Yanshanian time rather than the Hercynian time, as suggested by other researchers. Furthermore, age dating results indicate that the metallogenitic epoch in middle and eastern sections of the ore belt belongs to early Yanshanian, while in western section it belongs to late Yanshanian. This means that there is a changing trend from early to late of metallogenetic epoch in accordance with the ore belt from east to west. It also indicates a feature of multiple mineralization and mineral composition.It is proved by experiment, that for quartz sample an objective, ideal age volue can be obtained, provided that one can specifically treat the sample and seriously make correction of K,Ca,Cl-induced product after radiation to age calculations.

关 键 词：成矿时代 矿带 矿床 银矿 ^40Ar/^39Ar定年 燕山晚期 年龄测定 实验证明 理想 空间 

分 类 号：P618.51[天文地球—矿床学] P61[天文地球—地质学]