河北省平泉一带麻粒岩的某些岩石学特征

    GRANULITES IN THE PINGQUAN AREA,HEBEI PROVINCE

    • 摘要: 麻粒岩的英文名词为Granulite,由于它的定义不十分明确,各家理解不同,加上译名不一致,在我国曾将它译为粒变岩,白粒岩、变粒岩、浅粒岩等等。经程裕淇先生采用赵宗溥的意见后,改译为麻粒岩,目前国内已基本统一起来。后经许多地质学家的努力,特别是在1968年,Mehnert主持国际麻粒岩命名小组,并于1972年综合各家意见之后,“对麻粒岩提出如下的定义。麻粒岩是一种细至中粒的,主要由长石及石英(或不含石英)组成的变质岩石,其铁镁矿物又是不含水的。主要为花岗变晶结构,片麻状至块状构造。有些麻粒岩含透镜状石

       

      Abstract: The granulite distributed in the Shangpingfang Formation of the Qixi Group (Archean) in the Pingquan area,Hebei Province,exhibits a special texture,structure and mineral association and is different from typical mosaic granoblastic granulite.It may be divided into banded felsic granulite and gneissoid garnet-pyroxene-plagioclase granulite.The former is characterized by orientedly exsolved perthite and plastically deformed quartz Iamellae.while the latter exhibits a mortar texture and is composed by plagioclase(potassium teldspar). hypersthene, diopside,hornblende,garnet and quartz(±). The study of metamorphic facies may explain the effect of directional pressure on progressive metamorphism and meanwhile indicate that granulite is not all the product of deep burieal metamorphism.An in—depth study of the granulite of the area is conducive to the study of the history and features of the regional metamorphism of the area.

       

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