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基于离散元方法对走滑拉分盆地演化及次级断裂扩展过程研究
(1.长安大学地球科学与资源学院 陕西 西安 710054;2.Geotechnical Institute, TU Bergakademie Freiberg, Freiberg 09599, Germany)
PARTICLE-BASED MODELING OF CRACK PROPAGATION DURING PULL-APART BASIN DEVELOPMENT
(1.School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shannxi, China;2.Geotechnical Institute, TU Bergakademie Freiberg, Freiberg 09599, Germany)
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投稿时间:2019-10-02    修订日期:2019-10-07
中文摘要: 拉分盆地是一种与走滑断裂带密切相关的特殊拉张构造,因其重要的构造意义,及其与火山活动、中小地震群集、特殊的成矿作用间的伴生关系而受到研究者的高度重视。关于拉分盆地的形成演化过程,已有较多的研究成果,但是由于研究手段的限制,缺少对盆地演化中次级断裂扩展过程的研究。基于离散元的数值计算方法是研究断裂扩展方式的理想方法。本文采用基于离散元的颗粒流方法,揭示纯走滑拉分盆地发育过程中的断裂扩展和连接过程,为拉分盆地演化机理和断裂扩展提供新的研究方法。同时,根据主走滑断层与块体运动方向的夹角不同,建立不同的张扭性拉分盆地模型,系统研究张扭性盆地的断裂扩展和演化机理。将上述理论研究结果与死海盆地等经典拉分盆地实例相结合,探讨了死海盆地、土耳其Cinarcik盆地、哥伦比亚El Paraiso盆地等的形成演化机理和断裂扩展方式。
Abstract:Pull-apart basins are extensional structures which are closely related to strike-slip faults. Pull-apart basins have received considerable attention from geologists because of its significant tectonic meaning and the associations with volcanism, earthquake swarms, and special mineralization. Although numerous studies have contributed to the current understanding of pull-apart basin evolution, pull-apart basin development concentrating on crack propagation and coalescence is lacking because of the limitations of the previous methods. A particle-based approach, which is based on Discrete Element Method (DEM), can be successfully used to simulate crack propagation during pull-apart basin development for pure strike-slip. Transtensional models are also set up to investigate basin development and crack propagation in transtentional systems, with different angles between the master strike-slip faults and the motion direction in each system. Modeling results are compared with natural examples worldwide such as the Dead Sea basin, Cinarcik basin in Marmara Sea, and El Paraiso basin in SW Colombia et al. This research provides new method and view to study the evolution of pull-apart basins and the propagation and coalescence of the related strike-slip faults.
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基金项目:国家自然科学基金(41902210)
引用文本:
刘源,KONIETZKY Heinz.基于离散元方法对走滑拉分盆地演化及次级断裂扩展过程研究[J].地质力学学报,2019,25(5):840-852DOI:10.12090/j.issn.1006-6616.2019.25.05.069
LIU Yuan,KONIETZKY Heinz.PARTICLE-BASED MODELING OF CRACK PROPAGATION DURING PULL-APART BASIN DEVELOPMENT[J].,2019,25(5):840-852DOI:10.12090/j.issn.1006-6616.2019.25.05.069

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