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西藏泽当蛇绿岩的SM-ND等时线年龄及其意义
Sm-Nd Isochron Age of Zedang Ophiolite in Tibet and Its Significance
【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。
【Abstract】 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.
【基金】 中国科学院知识创新工程项目(编号:KZCXZ-SW-117);国家自然科学基金项目(编号:40072022)资助成果。
- 【文献出处】 地球学报 ,Acta Geoscientica Sinica , 编辑部邮箱 ,2006年01期
- 【分类号】P588.1
- 【被引频次】42
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