龙门山造山带—川西前陆盆地系统形成的动力学模式及模拟研究

STUDY ON THE DYNAMIC MODE AND ITS SIMULATION IN THE FORMATION OF LONGMEN MOUNTAIN-WEST SICHUAN FORELAND BASIN SYSTEM, CHINA

刘树根 罗志立 赵锡奎 乐光禹 刘顺 李天斌 宋鸿彪

LIU Shu-gen LUO Zhi-li ZHAO Xi-kui YUE Guang-yu LIU Shu LI Tian-bin SONG Hong-biao

成都理工大学, "油气藏地质及开发工程"国家重点实验室, 四川, 成都, 610059

Chengdu University of Technology, Chengdu, Sichuan 610059, China

民文进一步阐述了龙门山造山带—川西前陆盆地系统的动力学模式,即L—型俯冲模式。通过物理模拟和数值模拟,进一步证实了L—型俯冲的存在。在龙门山造山带—川西前陆盆地系统的形成演化过程中,深部物质的调整及重力起着重要作用;L—型俯冲发生的动力源来自于地球深部;深部的动力是通过几个主干深大断裂的活动来实现的;主干断裂从深部到浅部错动量有逐渐减小的趋势。塑性软弱层和基于此的滑脱作用在龙门山造山带—川西前陆盆地系统的形成演化过程中起着十分重要的作用,并且地幔塑性层的水平相对位移,通常大于地壳塑性层的水平相对位移。

The paper has further discussed the dynamic mode of Longmen Mountain-West Sichuan Foreland Basin System, which is Longmenshan subduction (simply called L-type Subduction).It is further confirmed through the physical simulation and mathematic simulation that L-type subduction existed in the a-rea.The gravity and adjustment of deep material had taken an important role in the process of the formation and evolution of Longmen Mountain-West Sichuan Foreland Basin System.The dynamic source, formatting L-type Subduction, was from the deep.The deep dynamic force took the role depending on the main deep faults.There is a tendency that the relative displacement of the main faults decreased from the deep to the shallow.The plastic and soft layers and the sliding on them had taken an important role in the formation and evolution of Longmen Mountain-West Sichuan Foreland Basin System.The horizontal relative displacement of Mantle plastic layer is usually greater than the horizontal relative displacement of Crust plastic layers.

国土资源部“九五”重点课题“中国两部盆山系统的耦合关系及其动力学过程”(编号:950117)的部分研究成果

https://doi.org/10.11781/sysydz200305432