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峡河岩群是从原秦岭岩群中部新解体出的中元古代地层单位，分布于豫陕交界处，呈北西向展布。在晋宁期，峡河岩群原岩下冲深埋，形成变质地体；加里东—海西期韧性抬升改造并遭受花岗热穹叠加。这些过程伴随有榴辉岩的构造侵位及高压变质。
The Gap River Rock Group is a newly-formed Mesoproterozoic stratigraphic unit newly disintegrated from the central part of the former Qinling rock group, distributed at the junction of Henan and Shaanxi and distributed in the NW direction. During the Jinning period, the original rocks of the Xiahehe Group under the heaved rocks were buried deeply to form metamorphic terranes. The Caledonian-Hercynian ductile uplift was transformed and subjected to superimposed granite thermal domes. These processes are accompanied by tectonic emplacement and high-pressure metamorphism of eclogites.