论文部分内容阅读
本文通过地质构造形象的分析,对我国西南地区地质时期构造应力场转变特征进行了尝试研究。认为我国西南地区构造应力场,是随时间在变化的,并表现出一定的规律。上古生代之前,地壳竖直运动主要表现为东南部相对上升,西北部相对下降;上古生代以后表现为西部相对上升,东部相对下降。水平应力场自古生代以来,北部主要承受自北而南的压应力作用,西部主要承受自西向东的压应力作用,东部、东南部除加里东晚期外其压应力方向有自北北西向北西西方向偏转的趋势;而应力作用方式,已由上古生代前的南东方向挤压为主,转变为西部的自西向东挤压为主。
Based on the analysis of the image of geological structure, this paper attempts to study the tectonic stress field transitional features in the geologic period of Southwest China. It is believed that the tectonic stress field in southwestern China is changing with time and shows certain rules. Before the Paleozoic, the vertical movement of the crust mainly showed a relative rise in the southeast and a relative decrease in the northwest. After the Paleozoic, the western rose relatively and the east decreased relatively. Since the Paleozoic, the horizontal stress field is mainly subjected to the compressive stress from north to south in the north, the compressive stress from west to east in the west, and compressive stress in the east and southeast except from the Caledonian to the north and west to the north and west Direction of the deflection of the trend; and stress mode of action, from the Upper Paleozoic south-east direction before the extrusion, the West into the West from the main east-west extrusion.