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冀东早太古代迁西群是由火山-沉积岩系变质生成的一套变质杂岩。它的主体是麻粒岩类以及退变质生成的斜长角闪岩类的岩石。该套变质岩系的下部夹有层状和透镜状变质超镁铁质岩(变橄辉岩、变辉橄岩、变辉石岩及变闪辉岩),而上部为变质的含铁岩系。以石渣子山和娄子山为例,它们的含铁岩层分别为辉石磁铁石英岩和英榴易熔岩。 本区的麻粒岩和斜长角闪岩在岩相学上呈渐变关系。绝对不含角闪石和/或富钛黑云母的麻粒岩是很少的。本文将以角闪石和斜长石为主要组成矿物的岩石归为斜长角闪岩类。在斜长角闪岩类岩石中,角闪石含量大大超过辉石,另外常见被角闪石交代的辉石残晶。
The Early Western Qizong migration in western Hebei is a metamorphic complex formed by the metamorphism of volcanic-sedimentary rocks. Its main body is granulite and degenerated amphibolite rocks. The metamorphic rocks have layered and lenticular metamorphic ultramafic rocks (metamorphite, pluton, amobite and dacitestone) in the lower part of the metamorphic series and metamorphic iron-bearing rocks in the upper part system. Taking Shiquzi Mountain and Louzi Mountain as examples, their iron-bearing rock formations are pyroxene magnetite quartzite and Yingruili volcanic rock, respectively. The granulite and amphibolite in this area show a gradual relationship in petrography. Granulites that are absolutely free of amphiboles and / or titanium-rich biotites are rare. In this paper, amphibole and plagioclase as the main mineral composition of rocks classified as amphibolites. Amphibolite rocks in amphibole type, amphibole content greatly exceeded pyroxene, while the other is commonly replaced by amphibole residual pyroxene.