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一、前言太古代迁西群地层在研究区广泛分布,主要出露于宣化以北的西望山—四台嘴一带(图1),构成了走向北西-南东的波状褶皱群。本区的迁西群下部,主要由(石榴)斜长辉石(角闪)岩组成,夹有基性麻粒岩;中部主要由中酸性麻粒岩组成,夹有基性麻粒岩;顶部主要由片麻岩组成,夹有变粒岩和磁铁石英岩。研究区的原岩为火山-沉积岩系。
I. Preface The Archean Westward Paleozoic strata are widely distributed in the study area and are mainly exposed in the vicinity of Xishan Mountain - Sishitaizui (Figure 1) north of Xuanhua, forming a wavy fold group moving to the northwest-south east. The lower part of the Qianxi Group in this area consists mainly of (pomegranate) plagioclase (hornblende) rock with the basic granulite sandwiched between them; the central part is mainly composed of moderately acidic granulite with intergranular granulite; The top is mainly composed of gneiss, graded with granulite and magnetite quartzite. The original rock in the study area is volcano-sedimentary rock series.