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基于岩体塑性位错理论的龙门山区域构造系统演化过程
投稿时间:2019-10-09  修订日期:2020-01-12  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020058
摘要点击次数: 49
全文下载次数: 47
作者单位E-mail
师皓宇 华北科技学院 shihaoyu2000@163.com 
马念杰 中国矿业大学(北京)  
王永建 华北科技学院 wyj1981@ncist.edu.cn 
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:青藏高原对四川盆地的挤压作用导致了龙门山断裂带的形成及其山脉的隆起。本文以龙门山附近区域板块运动以及深部岩体力学特性为背景,采用FLAC3D软件模拟再现了时间跨度为320万年的龙门山区域构造系统演化过程。研究结果表明:在板块运动作用下,断层首先形成,贯通的断层对地表的抬升具有较强的控制作用,当断层贯通于地表后,龙门山及以左的川西高原持续隆起,平均抬升速率约为1.38mm/yr,而龙门山断裂带以右的川西坳陷只有较小的抬升量,二者之间具有较大的落差,模拟的地形特征与目前的地形地貌基本相似。依据模拟结果与实测资料,绘制了龙门山断裂带形成及其附近区域地形地貌的演化过程图。由此可以得到以下结论:在板块挤压作用下,断裂带的形成是一种必然结果,龙门山区域构造系统的形成则是板块挤压、地表侵蚀和沉积作用等因素共同作用的结果。
中文关键词:板块运动,龙门山断裂带,区域构造系统,塑性位错,地形地貌,演化过程
 
Evolution Process of Regional Tectonic System in Longmenshan Mountains Based on Plastic Dislocation Theory of Rock
Author NameAffiliationE-mail
shi haoyu North China Institute of Science and Technology shihaoyu2000@163.com 
ma nianjie China University of Mining and Technology (Beijing)  
wang yongjian North China Institute of Science and Technology wyj1981@ncist.edu.cn 
Abstract:The compression of the Qinghai-Tibet Plateau to the Sichuan Basin resulted in the formation of the Longmenshan fault zone and the uplift of its mountains. Based on the regional plate motion characteristics near Longmenshan Mountain and the mechanical properties of deep rock mass, evolution process of regional tectonic system in Longmenshan with a time span of 3.2 million years are simulated and reconstructed by FLAC3D. The results show that a fault zone is formed firstly under the action of plate movement. The through faults have a strong controlling effect on the uplift of the surface,when the fault passes through the surface, Longmenshan and the western Sichuan plateau continue to uplift, with an average uplift rate of about 1.38 mm/yr; the western Sichuan depression in the right of the Longmenshan fault zone has only a small uplift, and there is a large gap between them. The simulated topographic characteristics are basically similar to the current topographic features. Based on the simulation results and the measured data, the evolutionary process map of the formation of Longmenshan fault zone and its adjacent regional topography is drawn. It can be concluded that the formation of the fault zone is an inevitable result under the action of plate compression; The formation of regional tectonic system in Longmenshanis the result of the combined action of plate compression, surface erosion and sedimentation.
keywords:Plate Movement, Longmenshan Fault Zone, Regional Tectonic System,Plastic dislocation, Topographic and Geomorphological,Evolutionary Process
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