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地质学报  2005 

青藏高原唐古拉山中新生代花岗岩锆石U-Pb年龄、地球化学特征及其大陆动力学意义

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Keywords: 中、新生代花岗岩,锆石U-Pb定年,地球化学,大陆动力学,唐古拉山

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Abstract:

应用单颗粒锆石U-Pb法,对出露于羌塘地体中央隆起带唐古拉山北坡的花岗岩体进行侵位年代测定,结果表明它们是中生代末至新生代早期多次岩浆脉动、涌动上侵定位的产物。其中龙亚拉花岗岩体(69.8±2.0Ma)、木乃花岗岩体(67.1±2.0Ma)是印-亚板块早期碰撞的产物;赛多铺岗日花岗岩体(40.6±3.1Ma)为印-亚板块主碰撞期花岗岩。岩石类型主要包括辉石石英二长岩、二长花岗岩和钾长花岗岩,初始锶同位素比值(87Sr/86Sr)为0.706039~0.714069。研究表明,中生代末至新生代花岗岩浆均起源于壳幔混熔,属同碰撞―晚造山期的壳幔型花岗岩。详细的单颗粒锆石U-Pb同位素定年为研究青藏高原的形成演化与地球动力学过程提供了重要的依据。

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