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中文摘要：
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。
英文摘要：
SHRIMP Ⅱ technique is applied to U-Pb dating of the two-mica granite of Dala pluton which belongs to Lhagoi Kangri belt in southern Xizang （Tibet）. The result shows that the formation time of the Dala pluton is 24.7 Ma. Magma composite zircons with old core and new margin are abundant in Dala pluton. The age of the old core of magma composite zircons change from 2796.8 Ma to 3196 Ma. It indicates that there is Archaean basement under the area Dala pluton locates in.
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