| 前陆冲断带非对称性变形与逆冲断层运动学指向 |
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| 引用本文： | 陈书平,万华川,袁浩伟,王信棚,黄学尧.前陆冲断带非对称性变形与逆冲断层运动学指向[J].地质力学学报,2022,28(2):182-190. |
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| 作者姓名： | 陈书平 万华川 袁浩伟 王信棚 黄学尧 |
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| 作者单位： | 1.中国石油大学(北京) 油气资源与探测国家重点实验室，北京 102249 |
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| 基金项目： | 国家自然科学基金（41172124,42172138）；国家重点研发计划（2017YFC0603105）；中国科学院战略性先导科技专项（XDA14010306） |
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| 摘 要： | 前陆冲断带冲断层的冲断方向一直没有得到理论解释.文中基于库伦断裂理论和造山带前陆冲断带变形的非对称性,分析了前冲断层和反冲断层的成因.变形初期将会出现两组共轭势断裂面,随后在变形非对称引起的准静力平衡条件下,两组势断裂面中所需作用力小的那组断裂面将更容易发育成冲断层,断层滑动所需作用力包括克服滑脱面摩擦力和断层面摩擦力...
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| 关 键 词： | 前陆冲断带 变形非对称 准静力平衡 库伦断裂 运动学 冲断方向 |
| 收稿时间： | 2021/7/14 0:00:00 |
| 修稿时间： | 2022/2/11 0:00:00 |
Deformation asymmetry in foreland thrust belts and the kinematic direction of the related thrust faults |
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| CHEN Shuping,WAN Huachuan,YUAN Haowei,WANG Xinpeng,HUANG Xueyao.Deformation asymmetry in foreland thrust belts and the kinematic direction of the related thrust faults[J].Journal of Geomechanics,2022,28(2):182-190. |
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| Authors: | CHEN Shuping WAN Huachuan YUAN Haowei WANG Xinpeng HUANG Xueyao |
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| Affiliation: | 1.State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China2.College of Geosciences, China University of Petroleum, Beijing 102249, China |
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| Abstract: | The thrust directions in foreland thrust belts have not been explained on theory. Based on Coulomb fracture criterion and deformation asymmetry in foreland thrust belt, the origins of fore-thrust and back-thrust faults are analyzed in this paper. Two potential conjugate fractures would occur in initial deformation stage, and the fracture requiring less applied forces might develop into thrust fault under the quasi-static equilibrium caused by deformation asymmetry in foreland thrust belts. The applied forces needed to create fault movements include the frictions along both the detachment surface and the fault surface. The fore-thrust faults will occur in most deformations in foreland thrust belts. However, where either the principal stress axes tilt toward foreland or the intersections point of the two conjugate fractures are on the detachment surface, the back-thrust faults will be preferable to occur. The applied force, the frictions along the detachment surface and the geometries of the slipping terranes will determine the principal stress axes. The findings will help to explain the selectivity of the fault dips in both contractional and extensional deformation areas. |
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| Keywords: | foreland thrust belt deformation asymmetry quasi-static equilibrium Coulomb fracture kinematics thrust direction |
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