P wave velocity structure of the North China Craton and West Pacific active continental margin: exploration for dynamic processes of lithospheric thinning
文献类型：期刊论文
| 作者 | Guo Hui-Li1,2; Xu Pei-Fen1; Zhang Fu-Qin1 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2014-07-01 |
| 卷号 | 57期号:7页码:2352-2361 |
| 关键词 | Seismic tomography North China Craton West Pacific active continental margin Pacific subduction Lithospheric delamination-thinning |
| ISSN号 | 0001-5733 |
| DOI | 10.6038/cjg20140729 |
| 文献子类 | Article |
| 英文摘要 | We determined the three-dimensional (3D) P wave velocity structure beneath the North China Craton and its east region (30 degrees N-50 degrees N, 95 degrees E-145 degrees E) using 539815 arrival times from 21504 local and regional earthquakes, and 318976 data from 13062 teleseismic events, which were recorded by 2626 seismic stations in our study region. The seismic images show some new features. Low and high velocity anomalies are imaged alternately in the upper mantle, denoting a typical structure pattern of the subduction zone and the upper mantle wedge above the Western Pacific subduction zone. At depth of 300 similar to 400 km the subducting slabs with high velocity anomalies were separated by low velocity anomalies, implying that break-off of the subducting Pacific slab might have happened in the mantle. Multilayer east dipping high velocity anomalies are imaged at the depth range of upper mantle and mantle transition zone beneath the North China Craton. Based on the seismic features above, a model of seismic structure beneath the study area is given in this paper and the deep dynamics between the North China Craton and the West Pacific active continental margin is discussed. We suggest that the Pacific subduction (or/and breakoff) triggered upwelling of hot mantle material and formation of convection in the mantle wedge, which caused cratonic lithosphere modification (underplating and weakening). As the subduction retreated, convection in the mantle wedge and the influence range of the modification for lithosphere moved eastward, resulting in lithospheric thinning of the North China Craton by three stages of delamination. This helps explain why the present lithosphere thickness of the North China Craton has step changes from west to east. |
| WOS关键词 | SINO-KOREAN CRATON ; SUBDUCTION ZONE ; MANTLE BENEATH ; EASTERN CHINA ; TRAVEL-TIMES ; DESTRUCTION ; MECHANISM ; EVOLUTION ; JAPAN ; CRUST |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000339645100029 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/85541]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Guo Hui-Li |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Guo Hui-Li,Xu Pei-Fen,Zhang Fu-Qin. P wave velocity structure of the North China Craton and West Pacific active continental margin: exploration for dynamic processes of lithospheric thinning[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2014,57(7):2352-2361. |
| APA | Guo Hui-Li,Xu Pei-Fen,&Zhang Fu-Qin.(2014).P wave velocity structure of the North China Craton and West Pacific active continental margin: exploration for dynamic processes of lithospheric thinning.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,57(7),2352-2361. |
| MLA | Guo Hui-Li,et al."P wave velocity structure of the North China Craton and West Pacific active continental margin: exploration for dynamic processes of lithospheric thinning".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 57.7(2014):2352-2361. |
入库方式： OAI收割
来源：地质与地球物理研究所
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