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地质通报  2010 

藏东类乌齐地区花岗质片麻岩锆石CamecaU-Pb定年及其地质意义

, PP. 1123-1128

Keywords: 锆石CamecaU-Pb年龄,花岗质片麻岩,澜沧江结合带,类乌齐地区

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Abstract:

西藏东部类乌齐一带吉塘岩群中新识别出一套花岗质片麻岩。花岗质片麻岩中锆石Th/U比值较高(Th/U>0.49),阴极发光图像显示锆石内部韵律环带明显,具典型岩浆锆石成因的特征。Cameca锆石U-Pb同位素加权平均年龄为282.1Ma±0.9Ma,表明花岗岩岩体形成于早二叠世,暗示澜沧江结合带在早二叠世存在岩浆增生事件。

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