【摘要】 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。更多还原

【Abstract】 SHRIMP U-Pb zircon dating of porphyritic granodiorite in the Kangrinboqê pluton in the western segment of the Gangdise belt, southwestern Tibet, yielded an age of 48.3±1.5 Ma. This age shows that the Kangrinboqê granodioritic pluton was emplaced or crystallized in the Himalayan Stage, equivalent to the middle Eocene. The formation time of the pluton is a little later than the time of initial India-Eurasia collision. It is the product of collision of the two continents and belongs to syncollisional granite.更多还原