辽东早元古造山带隆滑构造初析

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辽东早元古代裂谷带内的隆滑构造是在吕梁造山前期伸展体制下的第一幕变形期间形成的。本区隆滑构造的内核隆起部位大致与中南岩基空间分布一致,由同构造侵位的二长花岗岩(辽吉花岗岩)组成,在裂谷带西区和东区,辽吉花岗岩皆顺基底与盖层之间的接合面呈席状侵位。由于辽吉花岗岩局部隆起,引起外壳内多层滑脱型韧性剪切带(简称韧变带)及流褶层的形成,在递进变形过程中流褶层会发生尖灭。因变形分解作用,在形成韧变带及流褶层的同时,也形成一些巨型透镜体,它们为弱变形域或未变形域,其内原生构造保存完整。对流褶层内流动褶皱的倒向及拉伸线理的统计,结果进一步表明中南岩基为辽河群内隆滑构造的隆起部位。现今东区和西区的穹形构造是初始席状侵位的叠加性构造,即在吕梁运动期间收缩体制下,辽吉花岗岩仍呈塑性并向背斜部位聚集,呈底辟式重就位;第三幕构造形迹横跨叠加于第二幕构造形迹之上,从而最终使辽吉花岗岩有规律地分布于穹形构造核部。 The Longlian fault structure in the Early Proterozoic rift zone of Liaodong was formed during the deformation of the first act under the extension system of the Lüliang orogen. The uplift of the core of the Longlian structure in this area is roughly consistent with the spatial distribution of the Sino-South rock basement. It is composed of the monzonitic granite (Liaogi granite) emplacement of the same structure. In the west and east of the rift zone, Layers of the interface between the seat-like emplacement. Due to the local uplift of the Liaogi granite, the multi-layer slippery ductile shear zone (referred to as the ductile zone) and the flow-folds layer are formed in the outer shell. The flow-folds layer will be extinct during the progressive deformation. Due to the deformation and decomposition, while forming the ductile zone and the streamfold layer, some giant lens bodies are also formed, which are weakly deformed or undeformed domains, and the native structures therein are preserved intact. The statistics of the reversal and extension of flow folds within the convective fold show that the Sino-South rock basement is the uplift of the Longliao slip in the Liaohe Group. Nowadays, the dome structure in the eastern and western regions is a superimposed structure of the initial sessile emplacement. That is, under the shrinkage regime during the Lvliang campaign, the Liaogi granite is still plastic and collects to the anticline, presenting a diapirous heavy position. The third The curtain structure trace overlaps with the structural trace of the second act, so that the Liaogi granite will be distributed regularly to the dome of the dome.
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