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地质学报  2001 

北京南口中生代双峰式岩墙群的组成及其特征

, PP. 205-212

Keywords: 双峰式岩墙群钾玄岩系结晶分异伸展构造中生代形成机制花岗质岩石

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Abstract:

在北京南口地区发现了一套NNW走向、颇具规模的、由基性钾玄岩和酸性花岗质岩石组成的双峰式岩墙群,其K-Ar同位素年龄为119-114Ma。本文重点讨论了岩墙群的野外地质特征及其岩石学特征。研究表明酸性岩墙和基性岩墙的稀土配分模式非常接近,并且无明显的铕异常,推测它们的岩浆来自两个有成因联系的岩浆源,而且两套岩浆之间不存在的结晶分异作用的关系,我们称之为双峰式岩墙群。研究还表明,两种岩浆最初占位时共呈液相,彼此接触部位成分发生一定程度的混染作用,但总体是互相独立的,岩墙产状和地球化学特征反映岩墙群是在伸展构造背景下侵位的,具有深源浅侵位的特征,反映了晚中生代研究区存在的伸展构造这对于全面认识华北“燕山运动”是有价值的。

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