| 龙门山构造带深部动力学过程与地表地质过程的耦合关系 |
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| 引用本文： | 颜照坤,王绪本,李勇,罗威,杨宜海,王兴建,邵崇建,闫亮.龙门山构造带深部动力学过程与地表地质过程的耦合关系[J].地球物理学报,2017,60(7):2744-2755. |
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| 作者姓名： | 颜照坤 王绪本 李勇 罗威 杨宜海 王兴建 邵崇建 闫亮 |
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| 作者单位： | 1. 油气藏地质及开发工程国家重点实验室(成都理工大学), 成都 610059;2. 成都理工大学沉积地质研究院, 成都 610059;3. 成都理工大学地球探测与信息技术教育部重点实验室, 成都 610059 |
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| 基金项目： | 国家自然科学基金项目（41502116，41674078，40839909，41372114，41340005）和油气藏地质及开发工程国家重点实验室开放基金研究课题（PLC201604）联合资助. |
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| 摘 要： | 发生在地球浅层的2008年汶川地震驱动了龙门山及前陆地区的地表同震垂向位移.根据冲断带-前陆盆地弹性挠曲模型理论,在进行弹性挠曲模拟反演的基础上,结合对深部地球物理特征(泊松比、电性结构)的分析,发现龙门山前陆盆地现今岩石圈有效弹性厚度(T_e)具有自东向西逐渐减薄的趋势,自川中地区的30~40 km减至龙门山地区的10~20 km.在对晚三叠世以来前陆盆地各阶段盆地结构进行刻画的基础上,进行弹性挠曲模拟反演,推断龙门山前陆盆地的前渊地区(四川盆地西部)岩石圈的T_e值自晚三叠世以来具有逐渐减薄的趋势.这可能与松潘一甘孜地块下方广泛存在的软流圈热物质对四川盆地西部岩石圈下部的长期加热而导致的熔融有关,反映了地球深部动力学过程与地球表层盆地演化之间的耦合关系.
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| 关 键 词： | 弹性挠曲模型 龙门山前陆盆地 汶川地震同震垂向位移 有效弹性厚度 深部动力学过程 |
| 收稿时间： | 2017-01-05 |
Coupling between the dynamic processes at depth and geologic processes on the surface of the Longmenshan thrust belt |
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| YAN Zhao-Kun,WANG Xu-Ben,LI Yong,LUO Wei,YANG Yi-Hai,WANG Xing-Jian,SHAO Chong-Jian,YAN Liang.Coupling between the dynamic processes at depth and geologic processes on the surface of the Longmenshan thrust belt[J].Chinese Journal of Geophysics,2017,60(7):2744-2755. |
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| Authors: | YAN Zhao-Kun WANG Xu-Ben LI Yong LUO Wei YANG Yi-Hai WANG Xing-Jian SHAO Chong-Jian YAN Liang |
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| Institution: | 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;2. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China;3. Key Lab of Earth Exploration and Information Techniques of Ministry of Education, Chengdu 610059, China |
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| Abstract: | The 2008 Wenchuan great earthquake triggered the coseismic vertical displacements on the surface of the Longmenshan and foreland region. Based on the theory of elastic flexure model for thrust belts and foreland basins, this study conducted elastic flexure modeling for inversion of deformation data. Combining with the study on the deep geophysical characteristics (Poisson ratio, electrical structure), we determined the spatial distribution features of the effective elastic thickness (Te) in the Longmenshan foreland basin:the Te decrease from east to west, its values in the western Sichuan basin (10~20 km) are obviously smaller than the middle Sichuan basin (30~40 km). Based on the theoretical elastic flexure model and the structure of the Longmenshan foreland basin since Late Triassic, the changing trend of Te was inverted. It has decreased in the foredeep (the western Sichuan basin) of the Longmenshan foreland basin since Late Triassic. This change may be related with the long-term fusion in response to heating of the asthenosphere matter under the Songpan-Garzê block, and reflects the coupling relationship between the dynamic processes of earth's deep interior and the surface evolution of the basin. |
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| Keywords: | Elastic flexure model Longmenshan foreland basin Coseismic vertical displacements triggered by Wenchuan earthquake Effective elastic thickness Dynamic processes of earth's deep interior |
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