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西藏西南普兰错果弄巴电气石二云母花岗岩SHRIMP锆石U-Pb定年

, PP. 517-521

Keywords: SHRIMP锆石U-Pb定年,电气石二云母花岗岩,错果弄巴,普兰,西藏

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Abstract:

采用SHRIMP定年方法,测得错果弄巴花岗岩206Pb/238U年龄为(16±0.5)Ma。定年结果反映了岩浆从地壳深部快速上升的绝热降压变质事件形成于印度板块与欧亚板块挤压碰撞后的构造隆升环境,与喜马拉雅造山带大规模的逆冲推覆构造作用、伸展拆离作用和淡色花岗岩侵位同步,说明该区花岗岩经历了多期变质和复杂的地质演化过程。作者认为(16±0.5)Ma可以定为错果弄巴花岗岩体的最终侵位时间。

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