作　　者： ; ; (周国庆）; (王冉）; (钟立峰）; (万哨凯）;

机构地区： 中国科学院广州地球化学研究所边缘海地质重点实验室

出　　处： 《地球学报》 2006年第1期31-34,共4页

摘　　要： 泽当蛇绿岩位于雅鲁藏布江蛇绿岩带东段,对蛇绿岩中的玄武岩进行了全岩SM-ND同位素分析,得到的等时线年龄为175±20MA,初始ΕND(T)=+7.2,表明泽当蛇绿岩形成于中侏罗世,来源于强烈亏损的地幔源区,没有受到大陆地壳物质的混染。 Zedang ophiolite is located in the eastern segment of Yalung Zangbo ophiolite belt, Tibet. The whole rock Sm-Nd isochron age of basalts in Zedang ophiolite is 175±20 Ma, indicating that the ophiolite was formed in the Middle Jurassic. The initial ε_ Nd (t) value of basalt is +7.2, suggesting that the Zedang ophiolite was derived from a strongly depleted mantle and did not suffer from crustal contamination.

关 键 词： 蛇绿岩 等时线年龄 泽当 西藏

领　　域： [天文地球]