冀东高级变质区的构造特征──冀东太古宙地质问题讨论之三

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按照韧性剪切带的发育程度,将区内划分为迁西群分布区的弱变形域和遵化群分布区的强变形带。根据各种形变特征,认为迁西群及遵化群分别存在三次及两次叠加褶皱,其中迁西期形成的为轴面南倾的东西向线状同斜褶皱;遵化期第一幕为北东向摆动的紧密线形倒转褶皱。由于边界条件的限制,叠加在迁西群上的褶皱,轴向转为近南北向。迁西期褶皱因属同斜而具简单层状体特征,故每个单体的叠加背向形并非三斜对称,主要部分也并非穹盆构造,而为w形蛇形弯曲,不存在原生的穹隆或卵形群构造;遵化期第二幕表现为舒缓的东西向叠加褶皱。区内的主要构造样式为包括迁西群在内的由叠加褶皱及两组共轭韧性剪切带共同作用所形成的迂西-曹在卵形隆起区;遵化群的弧形褶皱群被密云-喜峰口-王厂左行平移韧性断裂带带动形成的宽城-遵化帚状构造亚区以及由遵化群形成的青龙王厂-迁安重熔片麻岩穹隆亚区。 According to the development of ductile shear zone, the area is divided into the weak deformation zone of Qianxi group and the strong deformation zone of Zunhua group. According to various deformation features, it is considered that Qianxi Group and Zunhua Group have three times and two superimposed folds respectively, of which the east-west linear syncline folds with south-facing axes are formed in the Western Qianxi Period. The first act of Zunhua period is North-East to swing the linear linear fold reverse fold. Due to the limitation of the boundary conditions, the folds superimposed on the Qianxi Group moved axially to nearly north-south direction. Because of the synchronicity and the simple layered structure, the Qianxi fold is not triclinic and the main part is not a dome structure, but rather a w-shaped serpentine curve, there is no original Dome or ovoid group structure; the second act of Zunhua period showed a soothing east-west superimposed folds. The main tectonic styles in the area are formed by superimposed folds and two sets of conjugate ductile shear zones, including the Qianxi group. The arc-shaped folding group of the Zunhua group Miyun - Xifengkou - Wang plant left bank migration ductile fracture zone led by the formation of Kuancheng - Zunhua broom-like sub-area and Zunhua formation of the Dragon King plant - Qian’an remelting gneiss dome area.
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