XIAHE GROUP COMPLEX IN EAST QINLING AND RELATED PROBLEMS
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摘要: 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。Abstract: The Xiahe Group Complex in East Qinling is a Middle Proterozoic stratigraphic unit separated recently from the middle part of the original Qinling Group Complex.It is distributed in a NW direction on the Henan Shaanxi border.In the Jinningian period the protoliths of the Xiahe Group Complex plunged down and were buried at depths,thus forming a metamorphic terrane.In the Caledonian Hercynian,the rocks were uplifted in a ductile state and underwent reworking,on which the granitic thermal dome was superimposed. These processes were accompanied by tectonic emplacement and high pressure metamorphism of eclogite.The determination of this group complex provides new important information for the study of the composition,tectonic framework and evolution of the core complex of the Qinling orogen.
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Key words:
- East Qinling /
- Xiahe Group Complex /
- tectono lithostratigraphic unit /
- Middle Proterozoic
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