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那邦地区花岗片麻岩的锆石U-Pb年代学及Hf同位素组成研究

, PP. 273-283

Keywords: 那邦地区,锆石U-Pb年代学,Hf同位素组成,始新世岩浆作用

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Abstract:

滇西那邦地区三个花岗片麻岩样品的锆石U-Pb定年分别给出了55.0±0.5Ma、50.4±1.3Ma以及51.6±1.1Ma的结晶年龄,其εHf(t)介于-6.7~+7.8之间,具有壳幔双源特征,对应的二阶段模式年龄为0.63~1.55Ga。上述年龄的获得表明滇西那邦地区原划为前寒武纪的混合岩和花岗片麻岩至少有相当一部分形成于新生代。经与邻近腾冲-梁河花岗岩带及西藏冈底斯岩浆带的年代学对比,认为沿冈底斯-那邦地区存在广泛的始新世岩浆事件,其成因可能与印度板块和欧亚板块的初始碰撞有关。

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