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海南岛中三叠世造山后伸展作用:双峰式侵入岩的年代学及地球化学制约

, PP. 433-445

Keywords: 双峰式侵入岩,中三叠世,造山后,海南岛

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Abstract:

?在详细的野外地质调查基础上,对海南岛兴隆双峰式侵入岩进行了岩石学、年代学、地球化学方面的研究,并初步探讨其构造意义.呈双峰式的辉绿岩体与花岗岩体分别由独立的基性岩浆和酸性岩浆形成,在两者接触之处发生了局部的岩浆机械混合;辉绿岩的LA-ICP-MS锆石U-Pb年龄为(238±2)Ma,花岗岩的为(234±2)Ma,两者形成于同一构造岩浆作用事件;侵入岩的Si2O含量呈双峰式,微量元素特征表明它们形成于造山后伸展环境,其Sr-Nd同位素组成具有EMⅡ型富集地幔特征,其源区可能受到了俯冲流体交代作用的影响.兴隆侵入岩的形成指示海南岛中三叠世处于造山后伸展的构造环境,其形成与岩石圈伸展减薄背景下玄武质岩浆的底侵作用有关.

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