| 右江地区新生代断裂活动及构造变形机制的物理模拟分析 |
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| 引用本文： | 聂冠军,于红梅,何声,李冰溯,潘黎黎.右江地区新生代断裂活动及构造变形机制的物理模拟分析[J].地质力学学报,2020,26(3):316-328. |
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| 作者姓名： | 聂冠军 于红梅 何声 李冰溯 潘黎黎 |
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| 作者单位： | 1.广西壮族自治区地震局, 广西 南宁 530022 |
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| 基金项目： | 中国地震局地震科技星火计划项目（XH19033Y）；广西重点研发计划（AB1850042，AB18126040） |
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| 摘 要： | 右江地区北西向断裂起源于晚古生代右江盆地内发育的同沉积断裂,这些断裂近等间距平行分布,新生代以来发生了多期次左旋走滑活动,进而导致了右江地区整体发生简单剪切变形。利用三维沙箱模型展开了物理模拟实验,对新生代右江地区的变形机制进行了分析。实验结果表明,早期在红河断裂的左旋剪切错动和印支地块的顺时针旋转联合作用下,右江地区北西向断裂复活,并发生明显的左旋走滑活动;随后川滇地块发生东南向的挤出运动,对右江地区产生侧向挤压,导致了右江地区北西向断裂新一轮的快速左旋走滑活动,同时还导致了右江地区西部的地壳压缩增厚。实验证实新生代右江地区的简单剪切变形以及北西向断裂的走滑活动是印支地块和川滇地块挤出运动共同作用的结果,同时也是印度-欧亚板块碰撞产生的连锁反应之一。
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| 关 键 词： | 右江地区 走滑断裂 变形机制 地块 物理模拟 |
| 收稿时间： | 2019/5/10 0:00:00 |
| 修稿时间： | 2020/1/20 0:00:00 |
Physical simulation analysis of the Cenozoic fault activities and structural deformation mechanism of the Youjiang area |
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| NIE Guanjun,YU Hongmei,HE Sheng,LI Bingsu,PAN Lili.Physical simulation analysis of the Cenozoic fault activities and structural deformation mechanism of the Youjiang area[J].Journal of Geomechanics,2020,26(3):316-328. |
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| Authors: | NIE Guanjun YU Hongmei HE Sheng LI Bingsu PAN Lili |
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| Institution: | 1.Earthquake Administration of Guangxi Zhuang Autonomous Region, Nanning 530022, Guangxi, China2.Guangxi academy of engineering shock prevention, Nanning 530022, Guangxi, China3.Institute of Geology, China Earthquake Administration, Beijing 100029, China |
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| Abstract: | The NW-trending faults in the Youjiang area originated from synsedimentary faults developed in the Youjiang Basin of Late Paleozoic. In Cenozoic these equidistantly spaced faults have undergone multiple left-lateral strike-slip activities, which then led to a simple-shear deformation of the Youjiang area. A 3-D sandbox model is designed to study the deformation mechanism of the Youjiang area. The experimental results show that the NW-trending faults were reactivated and a strikingly left-lateral strike slip occurred under the left-lateral movement and the clockwise rotation of the Indochina block. And then the lateral compression of the Sichuan-Yunnan block resulted in a new round of fast left-lateral strike-slip of the NW-trending faults in the Youjiang area, and it also resulted in crustal compression and thickening in the western part of the Youjiang area. Both the left-lateral strike-slip activities of the NW-trending faults and the simple-shear deformation occurred in the Youjiang area in Cenozoic were driven by the extrusion of the Indochina Block and the Sichuan-Yunnan Block, and they can be viewed as one of the consequences of the India-Eurasia collision. |
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| Keywords: | Youjiang area strike-slip fault deformation mechanism block physical simulation |
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