南天山库勒湖蛇绿岩地球化学特征及其年龄  

The geochemical characteristics and the age of the Kule Lake ophiolite in the southern Tianshan.

作　　者：龙灵利[1] 高俊[1] 熊贤明[1] 钱青[1] 

机构地区：[1]中国科学院地质与地球物理研究所矿产资源重点实验室

出　　处：《岩石学报》2006年第1期65-73,共9页Acta Petrologica Sinica

基　　金：国家重点基础研究发展规划项目(编号:2001CB409803);国家自然科学基金(编号:40421202)资助。

摘　　要：南天山库勒湖蛇绿岩的形成环境和时代一直存有争议。本文通过对蛇绿岩基性熔岩的主量、微量和同位素地球化学研究,结果表明库勒湖蛇绿岩具N-MORB特征,推测其形成于小洋盆环境。基性辉长岩中锆石SHRIMP U-Pb年代学的研究表明425±8Ma古亚洲洋南缘南天山一带存在一小洋盆。It has been debated about the formation environment and the age of the Kule Lake ophiolite in southern Tianshan up to now. The major,trace element and isotope geochemical characteristics of the basic lavas of the Kule Lake ophiolite indicate that the basic lavas have a N-MORB affinity ,possibly suggesting a small ocean basin environment for them. The zircons from basic gabbro have obtained an age of 425 ± 8Ma by SHRIMP U-Pb method,indicating that a small oceanic basin may exist in the southern Tianshan along the southern margin of the Paleo-Asia ocean.

关 键 词：库勒湖蛇绿岩 地球化学 SHRIMP U—Pb年龄 

分 类 号：P588.125[天文地球—岩石学]