| 西太平洋俯冲板块对中国东北构造演化的影响及其动力学意义 |
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| 引用本文： | 田有,马锦程,刘财,冯晅,刘婷婷,朱洪翔,闫冬,李红昊.西太平洋俯冲板块对中国东北构造演化的影响及其动力学意义[J].地球物理学报,2019,62(3):1071-1082. |
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| 作者姓名： | 田有 马锦程 刘财 冯晅 刘婷婷 朱洪翔 闫冬 李红昊 |
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| 作者单位： | 1. 吉林大学地球探测科学与技术学院, 长春 130026;2. 国土资源部应用地球物理重点实验室, 长春 130026;3. 油页岩地下原位转化与钻采技术国家地方联合工程实验室, 长春 130026;4. 吉林大学应用地球物理实验教学中心, 长春 130026;5. 吉林大学地质资源立体探测虚拟仿真实验教学示范中心, 长春 130026 |
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| 基金项目： | 国家自然科学基金项目（41430322，41874049），国家重点研发计划"深地资源勘查开采"项目（2017YFC060130），吉林大学高层次科技创新团队建设项目和中央高校基本科研业务费专项资金联合资助. |
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| 摘 要： | 中国东北地区在古生代期间以众多微陆块的拼合以及古亚洲洋的闭合为特征,其后又经历了中-新生代太平洋构造域及中生代蒙古—鄂霍茨克构造域的叠加与改造,以致东北地区的构造行迹显得极为复杂,而大兴安岭重力梯级带及其西部地区构造演化是否与西太平洋俯冲有关仍然存在争议.本研究利用分布于中国东北、华北地区以及韩国、日本等部分台网所接收的近震与远震走时数据获得了中国东北地区壳幔精细的三维P波速度结构.成像结果显示,太平洋板块持续西向俯冲,俯冲板片的前缘停滞在大兴安岭—太行山重力梯度带以东区域的地幔转换带之中;长白山火山区上地幔存在着显著的低速异常体,推测西太平洋板块的深俯冲脱水导致了上地幔底部岩石的熔点降低,从而形成了大范围的部分熔融物质上涌.通过分析上地幔的速度结构,我们认为由于太平洋板块的大规模西向深俯冲,在大地幔楔中发生板片脱水、低速热物质上涌等复杂的地球动力学过程;俯冲板片前缘带动上地幔中不均匀分布的地幔流强烈作用于上部的岩石圈,这对东北地区深部壳幔结构乃至大兴安岭重力梯级带的形成、演化有着重要的影响.
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| 关 键 词： | 中国东北 地震层析成像 太平洋板块 大兴安岭重力梯级带 |
| 收稿时间： | 2018-02-01 |
Effects of subduction of the western Pacific plate on tectonic evolution of Northeast China and geodynamic implications |
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| TIAN You,MA JinCheng,LIU Cai,FENG Xuan,LIU TingTing,ZHU HongXiang,YAN Dong,LI HongHao.Effects of subduction of the western Pacific plate on tectonic evolution of Northeast China and geodynamic implications[J].Chinese Journal of Geophysics,2019,62(3):1071-1082. |
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| Authors: | TIAN You MA JinCheng LIU Cai FENG Xuan LIU TingTing ZHU HongXiang YAN Dong LI HongHao |
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| Institution: | 1. College of Geo-exploration Science and Technology, Jilin University, Changchun 130026, China;2. Key Laboratory of Applied Geophysics, Changchun 130026, China;3. National-Local Joint Engineering Laboratory of In-situ Conversion, Drilling and Exploitation Technology for Oil Shale, Changchun 130026, China;4. Central Lab of Applied Geophysics, Changchun 130026, China;5. Virtual Simulation Experiment Teaching Center of Stereo-Exploration of Geological Resources, Changchun 130026, China |
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| Abstract: | The Paleozoic tectonic evolution of Northeast (NE) China was dominated by the amalgamation of multiple microcontinental massifs and the closure of the Paleo-Asian ocean,whereas in the Mesozoic and Cenozoic,NE China experienced the overprinting of circum-Pacific and Mongol-Okhotsk tectonic systems,which finally resulted in the very complex tectonic features of NE China.In addition,there exists a big dispute on whether the tectonic evolution of Great Xingan gravity lineament (GXGL) and the region on its west was affected by the subduction of the Pacific plate.In this study,we determined a 3-D P-wave structure down to 1000 km depth beneath NE China using a great number of high-quality arrival-time data of local,regional and teleseismic events recorded by dense seismic networks in NE China,North China,South Korea and Japan.Our tomographic images show some new features in the subsurface of this region.The subducting Pacific slab is imaged clearly by high-velocity anomalies extending from the Japan Trench to the deep GXGL, stagnating in the mantle transition zone.The Changbaishan intraplate volcano is underlain by a significant low-V anomaly from the mantle transition zone and a big mantle wedge (BMW) is present up to the surface,which may reflect that the deep subduction dehydration of the Western Pacific plate resulted in lower melting point of the rock in the upper mantle,and further caused large-scale upwelling of partially molten material.Complex geodynamic processes occur in the BMW due to large-scale deep subduction of the Pacific Plate,such as the deep dehydration process of the subducting slab and upwelling of low-velocity and hot materials.The uneven mantle flow in the upper mantle driven by the subducting slab front poses strong action on the upper lithosphere,which has an important influence on the tectonic evolution of crust and upper mantle structure beneath NE China and even on the formation and evolution of the GXGL. |
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| Keywords: | Northeast China Seismic tomography Pacific plate the Da Hinggan Mountains Gravity lineament |
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