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甘肃北山音凹峡地区处于阴山—天山东西向复杂构造带的西段,区内花岗岩类岩体广泛发育,构造复杂,在全区形成了强烈挤压的破碎带。近两年来,笔者在该区参加1:5万区域地质调查工作过程中,发现区内广布的花岗岩类岩石实为类型比较齐全的各种混合岩和混合花岗岩,其面积占工作区总面积的85％以上。同时,还发现本区上二叠统方山口组也遭受了广泛的混合岩化作用,形成各类混合岩,并伴有良好的成矿作用,这种现象在北山区地质研究史上是罕见的。因此,研究本区的混合岩化作用,不但有其科学意义,而且也有实际意义。
The Yinya Gorge area in Beishan, Gansu is located in the western segment of the Yinshan-Tianshan east-west complex structural belt. The granitic rocks in the area have been extensively developed with complex structures and formed intense crushed zones in the region. In the past two years, I participated in 1: 50000 regional geological survey work in this area and found that the widely distributed granitic rocks in the area are actually all types of mixed rocks and mixed granites of various types. The total area of the work area More than 85%. At the same time, it is also found that the Upper Permian Fangshankou Formation in this area also suffered extensive mixed-rock formation and formed various types of mixed rocks with good metallogenesis. This phenomenon is rare in the history of Beishan geological research . Therefore, studying the mixed rockification in this area not only has scientific significance but also has practical significance.