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地质论评  2007 

西藏南部打拉二云母花岗岩锆石SHRIMP定年及其地质意义

Keywords: 锆石SHRIMP定年二云母花岗岩打拉西藏

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Abstract:

应用锆石SHRIMPⅡ定年技术,对西藏南部拉轨岗日岩带东段的打拉二云母花岗岩进行了测试,获得岩体形成年龄为24.7Ma(晚渐新世)。打拉岩体中具老核新壳的岩浆复合型锆石特别发育,其老核年龄范围为2796.8-3196Ma,反映打拉岩体所在部位的深部存在太古宙的古老基底。

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