论文部分内容阅读
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。
Qinling complex mainly by the metamorphic strata, orthogneiss gneiss, unknown gneiss, unknown belong to marble block and ophiolite composition. Metamorphic strata can be disintegrated Qinling rock group, gorge river group. The structure of the complex is characterized by three lenticular blocks NW obliquely stacked. The metamorphic rocks of the complex are formed in the Neoproterozoic Qinling subduction collision tectonic setting. The tectonic line may be NNW. Paleozoic is subjected to ductile uplift and granite thermal dome superimposition and NNW tectonic line. The Mesozoic and Cenozoic uplifts to the surface level, Brittle-ductile shear deformation superimposed, the construction line near EW. This tectonic evolution may reveal tectonic regimes and block movement direction characteristics in different stages of regional tectonics.