| 中国东北地区地壳、上地幔速度结构及其对矿产能源形成的控制作用 |
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| 引用本文： | 田有,刘财,冯晅.中国东北地区地壳、上地幔速度结构及其对矿产能源形成的控制作用[J].地球物理学报,2011,54(2):407-414. |
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| 作者姓名： | 田有 刘财 冯晅 |
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| 作者单位： | 吉林大学地球探测科学与技术学院, 长春 130026 |
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| 基金项目： | 国家973计划项目，深部探测专项，吉林大学基本科研业务费项目，国家自然科学基金，公益性行业科研专项，油页岩勘探开发项目 |
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| 摘 要： | 中国东北地区处于古亚洲洋和滨太平洋构造域叠合部位,地质构造极其复杂.利用东北及华北地区部分台网所接收的近震及远震走时资料获得东北地区地壳与上地幔三维P波速度结构,成像分辨率在80 km左右.成像结果表明东北地区地壳与上地幔具有较强的横向不均匀性.P波速度异常走向大体呈北东向,与该区地表构造走向一致.5 km深度的速度异...
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| 关 键 词： | 中国东北地区 地震层析成像 地壳与上地幔 P波速度 岩浆活动 |
| 收稿时间： | 2010-07-01 |
P-wave velocity structure of crust and upper mantle in Northeast China and its control on the formation of mineral and energy |
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| TIAN You,LIU Cai,FENG Xuan.P-wave velocity structure of crust and upper mantle in Northeast China and its control on the formation of mineral and energy[J].Chinese Journal of Geophysics,2011,54(2):407-414. |
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| Authors: | TIAN You LIU Cai FENG Xuan |
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| Institution: | College of Geo-exploration Science and Technology, Jilin University, Changchun 130026, China |
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| Abstract: | Northeast China, which is located at the composite part of Paleo-Asian ocean and Pacific ocean domains, has undergone multi-stage tectonism. The activity of crust and upper mantle is strong and geological structure is complicated. In this paper, we obtain the three-dimensional P-wave velocity model of northeast China by using P-wave travel times from local and teleseismic events in North and Northeast China. The tomographic resolution is about 80 km. The tomographic images show a very heterogeneous structure in the crust and upper mantle under Northeast China. The velocity structure in the shallow depth (5 km depth) correlates well with the surface geological features: Yanshan and Da Hinggan Ling orogens show high-velocity anomalies and the Bohai Bay and Songliao basin show prominent low-velocity anomalies which extend down to more than 200 km depth. Two low-velocity anomaly belts exist in Northeast China, which are along the Changbai Mountain and Songliao Basin, respectively. Changbai Mountain low-velocity anomaly extends down to about 400 km depth. Mantle Transitional Zone (MTZ) represents high-velocity anomaly which correlates well with the high-velocity Pacific subducted slab stagnating in the MTZ. High resolution tomographic images represent that structural evolution of Northeast China (e.g., magmatism, lithosphere evolution, deep seismicity and volcanism) is related to the upwelling of hot and wet asthenospheric materials in the big mantle wedge above the stagnant Pacific slab. The magmatism of Northeast China provided the source in formation of the minerals and took deep control effect on energy source formation. |
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| Keywords: | Northeast China Seismic tomography Crust and upper mantle P-wave velocity structure Magmatic activity |
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