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地质学报  2010 

川西北碧口地块老河沟岩体和筛子岩岩体地球化学特征及其构造环境

, PP. 343-356

Keywords: 强过铝质花岗岩,地球化学,构造环境,后碰撞,碧口地块

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Abstract:

老河沟岩体和筛子岩岩体位于碧口地块西南部。岩体的SiO??2?(69.89%~71.69%)和Al??2?O??3?(?15.01?%~16.25%)含量均很高,A/CNK在1.04~1.12之间,为硅和铝过饱和类型,属典型的强过铝质花岗岩。稀土元素总量(∑REE)为33.13×10??-6?~150.42×10??-6?,稀土元素配分曲线呈右倾型,具有弱的负铕异常。高场强元素(Ta、Nb、Ti等)具有明显的负异常,大离子亲石元素(Rb、Ba、Sr等)具有明显的正异常。岩体可能是以杂砂岩成分为主的沉积岩部分熔融形成的花岗质岩浆上升侵位过程中形成的,是一种典型的壳源成因类型。老河沟岩体和筛子岩岩体具有后碰撞岩浆活动的特征,是印支期华北和扬子地块碰撞导致地壳加厚环境下下地壳部分熔融的产物,形成于同碰撞(挤压环境)向碰撞后(伸展环境)转化阶段,为后造山花岗岩类。

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