龙门山断裂带横断层成因类型及地质意义

发布时间：2019-04-21 15:32

【摘要】：目前,对龙门山冲断带内横断层研究较为薄弱.在综合分析区域地质和地球物理资料的基础上,利用野外考察和构造物理模拟等方法,对龙门山冲断带横断层成因类型及地质意义进行了探析.研究表明:(1)龙门山断裂带中北段主要发育6条横向断层,其中虎牙横断层为中段与北段的分界,卧龙-怀远横断层为中段与南段的分界;(2)横向断层主要有3种成因类型:先存北西向断裂或薄弱带再活化、主断裂带差异逆冲产生的撕裂(调节)断层、X共轭剪切断层和横张断裂;(3)横断层调节了冲断带各段构造活动性、构造变形强度等多方面的差异,其可以独立发震、使龙门山主断裂带分段发震、与主逆冲断裂联合发震、在主震发生后控制余震分布、引发余震等.
[Abstract]:At present, the research on the transversal faults in Longmenshan thrust zone is relatively weak. On the basis of comprehensive analysis of regional geological and geophysical data, the genetic types and geological significance of transversal faults in Longmenshan thrust belt are analyzed by means of field investigation and structural physical simulation. The results show that: (1) six transverse faults are mainly developed in the middle-north segment of Longmenshan fault zone, in which the Huya fault is the boundary between the middle segment and the north segment, and Wolong-Huai distal fault is the division between the middle section and the south segment; (2) there are three main genetic types of transverse faults: NW-trending fault or weak zone reactivation, laceration (adjustment) fault produced by differential thrust in main fault zone, X-conjugate shear fault layer and transverse tension fault; (3) Transverse fault regulates the differences in structural activity and structural deformation intensity of each section of the thrust zone, which can produce earthquakes independently, and cause the main fault zone of Longmenshan to produce earthquakes in sections and combine with the main thrust faults. After the occurrence of the main earthquake, the distribution of aftershocks is controlled and the aftershocks are triggered.
【作者单位】：中国石油大学地球科学与技术学院;湖南省煤炭地质勘查院;中国地震局地质研究所地震动力学国家重点实验室;
【基金】：国家自然科学基金项目(No.41340008) 中央高校基本科研业务费专项资金(No.247201501024A)
【分类号】：P315.2

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