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本文综合研究了青藏高原大地构造格局、地壳与地幔结构、地球物理场特征,对青藏高原整体隆升的物理一力学机制,进行了总结,并提出了隆升、地壳短缩和增厚的动力学模式。论文对以下五个问题进行了研究和讨论:第一,青藏高原巨厚的地壳、薄的岩石图结构、不同产状深大断裂以及推覆、切割和碰撞造山带的基本模式;第二,地震活动、断层面解与区域应力场;第三,板块运移与地体拼贴和大陆增生;第四,青藏高原隆升的物理一力学机制分析;第五,青藏高原隆升的地球动力学模式。研究结果表明,南部印度板块向北运移并与欧亚大陆板块碰撞,北部则受古亚洲板块阻隔并向南推移。在长期的碰撞与挤压作用下,造成了高原地区异常的地震活动和应力场,Lg波能量向南快速衰减和Q值向南递增,水热活动强烈和地壳“南热”、“北冷”及岩石围中“壳热”、“慢冷”的格局。喜马拉雅南、北麓重力未达均衡,高山仍在上升,沿雅鲁藏布江由深部上涌的蛇绿岩套长达1700km,一系列走滑断层的形成和强烈的形变,形成了南界恒河平原北缘、北抵雅鲁藏布江的宽约300~500km的碰撞挤压过渡带。基于此,青藏高原的隆升和地壳短缩增厚的物理一力学机制为软流圈的拖曳作用,促使印度板块与欧亚板块的碰撞和长期的挤?
In this paper, the tectonic framework, the structure of the crust and mantle, the geophysical field characteristics of the Qinghai-Tibet Plateau and the physical-mechanical mechanism of the whole uplift of the Qinghai-Tibet Plateau are summarized, and the impetus of uplift, crustal shortening and thickening are proposed Learn mode. The dissertation studies and discusses the following five issues: First, the huge crust of the Tibetan Plateau, the thin rock structure, the deep faults of different occurrences and the basic models of the nappe, the cutting and the collision orogenic belt; Seismic activity, fault surface solution and regional stress field; thirdly, plate movement and terrane collage and continental accretion; fourthly, the physical-mechanical analysis of the uplift of the Qinghai-Tibet Plateau; fifthly, the geodynamics of the uplift of the Qinghai-Tibet Plateau Learn mode. The results show that the southern Indian plate moved northward and collided with the Eurasian plate, while the northern block was blocked by the ancient Asian plate and moved southward. Under the long-term collision and extrusion, the abnormal seismicity and stress fields in the plateau region are caused. The Lg wave energy decays rapidly to the south and the Q value increases to the south. The hydrothermal activity is strongly correlated with the “south heat” and “ ”And the rocks in the“ shell heat ”,“ slow cold ”pattern. In the south of Himalayas, the gravity in the northern foot has not reached equilibrium. The mountain is still rising. Along the Yarlung Zangbo River, the deep ophiolitic karst uplifts up to 1700km in length, forming a series of strike-slip faults and strong deformation, Edge, the north of the Brahmaputra to the width of 300 ~ 500km collision extrusion transition zone. Based on this, the physical-mechanical mechanism of the uplift of the Tibetan Plateau and the shortening and thickening of the crust is the dragging of the asthenosphere, prompting the collision and long-term squeezing between the Indian plate and the Eurasian plate.