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地质通报  2007 

西藏西部冈仁波齐花岗闪长岩锆石SHRIMPU-Pb定年及其地质意义

, PP. 1014-1017

Keywords: 锆石SHRIMPU-Pb定年,花岗闪长岩,冈仁波齐,冈底斯岩带西段,西藏

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Abstract:

冈底斯岩带西段冈仁波齐岩体斑状花岗闪长岩中的锆石SHRIMPU-Pb年龄测定结果为48.3Ma±1.5Ma,该年龄反映了冈仁波齐花岗闪长岩体的侵位或结晶年龄,属于喜马拉雅期,相当于中始新世。岩体的形成时间略晚于印度-欧亚大陆初始碰撞的时间,为两大陆碰撞作用过程中的产物,属同碰撞花岗岩。

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