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一、概述太行山中段出露的阜平群系一套经过高角闪岩相-麻粒岩相区域变质作用改造的变质杂岩。下部以角闪二辉麻粒岩、斜长角闪岩和片麻岩为主;中部以各类片麻岩、浅粒岩、斜长角闪岩为主,夹少量大理岩;上部以浅粒岩、钾长片麻岩、大理岩为主。同位素地质年代学的研究表明,阜平群的沉积时限在2900Ma 到2640Ma 年之间,在时限为2640—2560Ma 的阜平运动时期,该群经历了区域变质作用和变形作用的改造,形成现今所见的岩石组合,因此,阜平群属于太古宙。
I. Overview Fuping group exposed in the middle section of Taihang Mountains is a suite of metamorphic complexes altered by high-amphibolite facies-granulite facies metamorphism. The lower part is hornblende two-gneiss, amphibolite and gneiss; the central part is mainly composed of gneiss, shallow granulite and amphibolite with a small amount of marble; the upper part is shallow grain Rock, potassium long gneiss, marble-based. Isotopic geochronology studies show that the Fuping Group deposition time is between 2900Ma and 2640Ma. For the Fuping movement period of 2640-2560Ma, the group has undergone the transformation of regional metamorphism and deformation to form what is now seen Rock assemblage, therefore, Fuping group belongs to the Archean.