秦岭杂岩的组成、构造格局及演化

秦岭杂岩主要由变质地层、正片麻岩系、性质不明片麻岩系、归属不明大理岩块体及蛇绿岩片组成。变质地层可解体为秦岭岩群、峡河岩群。杂岩的构造格局以３个透镜状块体ＮＷ向斜列叠置为特征。杂岩变质体形成于新元古代北秦岭俯冲碰撞构造背景，构造线可能为ＮＮＷ；古生代遭受韧性抬升改造和花岗热穹叠加，构造线ＮＮＷ；中、新生代整体抬升至表层次，局部受脆韧性剪切变形叠加，构造线近ＥＷ。这种构造演化可能揭示了区域大地构造不同阶段构造体制及块体运动方向特征。

The Composition,Tectonic Framework and Evolution of Qinling Complex, Central China

Qinling complex is composed of metamorphic stratas, orthogneisses, gneisses unknown their types of original rocks, marble blocks unknown their ages and ophiolite slices. The stratas can be disintegrated into Qinling rock group and Xiahe rock group. The tectonic framework of the complex is characterized by oblique arrangement of three lenticular tectono stratigraphic blocks, showing NW direction tectonic line. The metamorphic terrane was formed in tectonic setting of the subduction collision in the north Qinling in late Proterozoic era, developing NNW direction tectonic framework, and then intensely reworked during plastic uplifting in Paleozoic era, characterized by NNW direction tectonics, and lately elevated into surface tectonic level as a whole terrane, superposed by EW direction brittle ductile shear zones. The character of the evolution of the complex reveal the feature of the state of the regional tectonics and moving direction of tectonic blocks in different periods.