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5.12汶川8级大地震表明龙门山断裂带仍然是一个构造活动带,为了达到防震减灾的目的,对其进行深入研究是很有必要的。通过龙门山北段毛坝—竹园坝实测构造地质剖面,分析野外实测构造的变形特征,根据变形强弱差异,将毛坝—竹园坝之间分为4个构造变形带,并总结各个构造带的变形特征以及变形序列。在野外研究基础上,首次提出竹园坝断裂,并指出竹园坝断裂是龙门山前山带的主干断裂之一,是喜马拉雅山运动的直接结果。最后,再结合前人资料讨论龙门山北段的构造演化。
The 5.12 magnitude Wenchuan M8 earthquake indicated that the Longmen Shan fault zone is still a tectonic activity belt. In order to achieve the purpose of earthquake prevention and disaster reduction, it is necessary to study it in depth. According to the measured tectonic and geologic profiles of Maoba-Zhuyuanba measured at the northern Longmenshan section, the deformation characteristics of the measured structures in the field were analyzed. According to the differences of deformation, the dam and the Zhuyuanba dam were divided into four structural deformation zones and summarized Deformation features of structural belts and deformation sequences. Based on the field research, the first time the Chukyuanba fault is proposed and it is pointed out that the Chukyuanba fault is one of the main faults in the Longmenshan foreland and is the direct result of the Himalayas movement. Finally, the tectonic evolution of the north segment of Longmenshan is discussed based on the previous data.