| 济阳坳陷济阳运动的动力学成因试析 |
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| 引用本文： | 史卜庆,郑凤云,周瑶琪,吴智平,顾勤.济阳坳陷济阳运动的动力学成因试析[J].高校地质学报,2002,8(3):356-364. |
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| 作者姓名： | 史卜庆 郑凤云 周瑶琪 吴智平 顾勤 |
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| 作者单位： | 1. 中国石油勘探开发研究院，北京100083; 2. 中原石油勘探局勘探开发科学研究院，河南濮阳 457001; 3. 石油大学（华东）油气资源与环境地质研究所， 山东 东营 257062 |
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| 基金项目： | 国家重点基础研究发展规划项目《中国典型叠合盆地油气形成富集与分布预测》《G1999043302、G199904:），中国博士后科学基金资助。 |
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| 摘 要： | 济阳运动是济阳坳陷新生代发展演化过程中一次极为重要的构造变动，具有区域性、块断性和阶段性的特点。济阳运动的形成是深部岩石圈动力学过程在近地表构造的反映。在沙四段沉积末期随岩石圈之下的热异常逐渐加大，岩石圈热结构发生变化，有效弹性厚度逐渐降低，模拟结果认为降低幅度可达8km，岩石圈的变形机制由弹性变形向塑性蠕变转变，这一转变导致的盆地地形变化响应可能是济阳运动形成的重要动力学因素。
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| 关 键 词： | 济阳运动 济阳坳陷 岩石圈 有效弹性厚度 变形机制 动力学成因 |
| 文章编号： | 1006-7493(2002)03-356-08 |
| 修稿时间： | 2002年5月17日 |
A Study on Geological Characteristics and Geodynamic Origin of Jiyang Movement, Bohai Bay Basin |
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| SHI Bu-qing,ZHENG Feng-yun,ZHOU Yao-qi,WU Zhi-ping and GU Qin.A Study on Geological Characteristics and Geodynamic Origin of Jiyang Movement, Bohai Bay Basin[J].Geological Journal of China Universities,2002,8(3):356-364. |
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| Authors: | SHI Bu-qing ZHENG Feng-yun ZHOU Yao-qi WU Zhi-ping and GU Qin |
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| Institution: | 1. CNPC Key Laboratory For Oil and Gas Reservoirs, RIPED, Beijing 100083, China; 2. Exporation and Development Research Institutle of Zhongyuan Petroleum Corporation, SINOPEC, Puyuan 457001, China; 3. Petroleum Resources and Environmental Geology Research Institute, University of Petroleum, Dongying 257062, China |
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| Abstract: | The Jiyang movement was a very important geologic event during the Cenozoic evolution of Jiyang Depression, Bohai Bay Basin. It occurred from the late deposition stage of Sha4 member to early Sha3 of the Eogene. The stratigraphic unconformity between these two members can be observed in a broad area. According to the results of paleontologic analysis, the paleotopography in this area is characterized by uplifting of highland and deepening of depression, which suggest that the Jiyang movement have a process of block faulting and tilting with large amplitude The geochemistry of volcanic rocks in Sha4 and Sha3 member indicates a deep background of enhanced stretching extent of lithosphere, enlarged upwelling amplitude of asthenosphere, intensified of magmatism and rising thermal flux during the Jiyang movement, which further suggest an obvious transformation of thermal constitution in lithosphere.Therefore, origin of the Jiyang movement could not be interprated as regional uplifting, and probably is related to deep processes. From the continental geodynamics point of view, the deformation of crust is the response of deep lithosphere process, and the effective elastic thickness (Te) of lithosphere dynamically controls crust deformation. According to the modern observation of continental geophysics, the accretion of Te could minimize the absolute value of lithosphere deformation and makes the spatial topography variation smooth gradually. Similarly, the decrease of Te could enlarge the absolute value of lithosphere deformation and obviously affect the topography. The mechanism is the change of lithosphere deformation style from elastic to plastic, and the response to sediment load changes from flexural to local isostasy, which is the result of smaller Te caused by transformation of thermal constitution in lithosphere. Hence the variation of Te is an important factor for the paleotopography evolution of basins.After theoretical modeling, this paper confirmed the dynamic origin of Jiyang movement is the decrease of Te, and its amplitude should be larger than 8km, which caused an altitude difference about 1 000m. The factors causing the decrease of Te include the continuous heating of thermal abnormality in asthenosphere, flowing of the plastic lower crust and displacement of block faulting, etc. |
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| Keywords: | Jiyang movement Jiyang Depression lithosphere effective elastic thickness deformation mechanism geodynamic origin |
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