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探讨柴达木盆地阿拉尔断裂的分段特征及其构造演化。对研究区两个三维地震以及多条二维地震剖面进行解释,针对阿拉尔断裂的几何学特征、断开的层位及两盘地层配置关系进行分析。认为阿拉尔断裂分为西段、中段和东段,断裂三段的走向、倾向、倾角、断距及断开的层位各不相同。阿拉尔断裂为基底深大断裂的延续,第一个演化阶段为中生代末期至新生代古近纪末,这个阶段为走滑-挤压阶段;第二个演化阶段为新生代新近纪初至第四纪,这个阶段为挤压抬升阶段。在挤压盆地中断裂的分段式构造特征普遍存在,不同的演化阶段是由于区域主应力方向发生改变,这也是致使断裂具有分段性原因。
Discussion on the Segment Characteristics and Tectonic Evolution of the Alar Fault in the Qaidam Basin. The two 3D earthquakes in the study area and several 2D seismic sections are explained, and the geometric characteristics of the Alar fault, the strata of the fault and the relationship between the two disk strata are analyzed. It is considered that the Alar fault is divided into the western segment, the middle segment and the eastern segment. The trend, inclination, dip angle, fault distance and disconnected layers of the three faults are all different. The Alar fault is the continuation of deep basal faults. The first evolutionary stage is from the end of Mesozoic Era to the end of Paleogene, which is the strike-slip-extrusion stage. The second evolutionary stage is from the beginning of Cenozoic to early Fourth Century, this stage for the squeeze up phase. The structural features of the fractures in the compression basins are ubiquitous. The different stages of evolution are due to the change of principal stress direction in the area, which is also the reason for the fragmentation of the fractures.