中文摘要：

北天山巴音沟蛇绿岩中堆晶辉长岩的LA-ICPMS锆石U-Pb测年结果确定：巴音沟蛇绿岩中辉长岩形成的同位素地质年代为344．0±3．4Ma。表明巴音沟蛇绿岩所代表的洋盆形成于早石炭世。综合前人天山石炭纪蛇绿岩及构造演化的研究成果，笔者认为巴音沟蛇绿岩是大陆板内强烈拉张的产物。

英文摘要：

A LA-ICPMS zircon U-Pb dating of gabbro from the Bayingou ophiolite in the northern TianshanMountains indicates that the magmatic age of the gabbro is 342.6±2.2 Ma （2a）, which shows the ocean basin represented by the Bayingou ophiolite was formed in the Early Carboniferous. Combined with studies of other geologists, we suggest that the Bayingou ophiolite occurred in a transition tectonic setting from continental rifting to ocean rifting.