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本文以震源机制、地震地质、地壳和上地幔速度结构等资料为基础,研究了与青藏高原成因有关的现代构造问题。主要内容有:1.高原边缘地带以反映压缩形变的逆断层活动为主,内部以一系列大致平行、呈弧形弯曲的左旋走滑断裂活动为主;2.喜马拉雅山以北的广大地域内存在着北北东走向的水平压应力,从六盘山到红河断裂带的主压应力轴走向由北东逐渐变为南东方向;3.高原地壳和上地幔顶部的地震波速度小于印度次大陆和阿拉善地块;4.高原的现代构造同地壳和上地幔顶部的横向不均匀性和印度洋板块的碰撞挤压作用有关。其构造形变过程可以同机器制造业中的《锻模加工》相比拟。
Based on the data of focal mechanism, seismic geology, crust and upper mantle velocity structure, this paper studies the modern tectonic problems related to the genesis of the Qinghai-Tibet Plateau. The main contents are as follows: 1. The edge of the plateau is characterized by reverse faults that reflect compressive deformation. The interior is dominated by a series of generally parallel, arc-shaped left-lateral strike-slip faults. 2. The vast area of memory north of the Himalayas Under the horizontal compressive stress in the north-north eastward direction, the main compressive stress axis from Liupanshan to Honghe fault zone gradually changes from the north east to the south-east direction. 3. The seismic wave velocity at the top of the plateau and the upper mantle is less than that of the Indian subcontinent and Allah 4. The modern structure of the plateau is related to the lateral inhomogeneity of the top of the crust and the upper mantle and the collision and extrusion of the Indian Ocean plate. Its tectonic deformation process can be compared with the “forging process” in the machine manufacturing industry.