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在新生代青藏高原隆升过程中,印度板块与欧亚板块碰撞挤压导致陆壳块体沿藏东南大型走滑断裂侧向挤出,该“碰撞挤出”模式合理地解释了三江地区新生代强烈的走滑活动。但是对三江地区复杂的逆冲褶皱变形、多期构造变形叠加方式及浅层构造变形的动力学机制还缺乏相应研究。通过考察横穿三江地区盆山单元的地质剖面,将该区浅层构造变形划分为挤压和剪切2种力学类型,并对各种变形特征进行分期、配套,得到印支期以来的叠加过程,从而探讨其动力学机制的转换,并提出新生代后期遍布全区的小型走滑断裂的运动学模型。
During the Cenozoic uplift of the Qinghai-Tibet Plateau, the collision between the Indian plate and the Eurasian plate led to the lateral extrusion of continental crust blocks along the large-scale strike-slip faults in the southeastern Tibet. The “collision-extrusion” mode explained Sanjiang Regional Cenozoic strong skidding activities. However, there are still a lack of corresponding studies on the complicated thrusting fold deformation, multi-stage tectonic deformation superimposition and shallow dynamic deformation in Sanjiang area. By investigating the geological profile of basin-mountain units crossing the Sanjiang area, the shallow tectonic deformation in the area is divided into two types of extrusion and shear mechanics, and the various deformation features are staged and matched to obtain the superimposition process since the Indosinian period , So as to explore the conversion of its kinetic mechanism and to propose the kinematic model of small-scale strike-slip faults in the late Cenozoic over the whole area.