Structure of the crust and uppermost mantle of the Yanshan Belt and adjacent regions at the northeastern boundary of the North China Craton from Rayleigh Wave Dispersion Analysis
文献类型：期刊论文
| 作者 | Tang, Qunshu; Chen, Ling |
| 刊名 | TECTONOPHYSICS
 |
| 出版日期 | 2008-07-18 |
| 卷号 | 455期号:1-4页码:43-52 |
| 关键词 | Rayleigh waves North China Craton Yanshan Belt crustal and uppermost mantle structure lithospheric reactivation |
| ISSN号 | 0040-1951 |
| DOI | 10.1016/j.tecto.2008.04.021 |
| 文献子类 | Article |
| 英文摘要 | We have used Rayleigh wave dispersion analysis and inversion to produce a high resolution S-wave velocity imaging profile of the crust and uppermost mantle structure beneath the northeastern boundary regions of the North China Craton (NCC). Using waveform data from 45 broadband NCISP stations, Rayleigh wave phase velocities were measured at periods from 10 to 48 s and utilized in subsequent inversions to solve for the S-wave velocity structure from 15 km down to 120 km depth. The inverted lower crust and uppermost mantle velocities, about 3.75 km/s and 4.3 km/s on average, are low compared with the global average. The Moho was constrained in the depth range of 30-40 km, indicating a typical crustal thickness along the profile. However, a thin lithosphere of no more than 100 km was imaged under a large part of the profile, decreasing to only similar to 60 km under the Inner Mongolian Axis (IMA) where an abnormally slow anomaly was observed below 60 km depth. The overall structural features of the study region resemble those of typical continental rift zones and are probably associated with the lithospheric reactivation and tectonic extension widespread in the eastern NCC during Mesozoic-Cenozoic time. Distinctly high velocities, up to similar to 4.6 km/s, were found immediately to the south of the IMA beneath the northern Yanshan Belt (YSB), extending down to > 100-km depth. The anomalous velocities are interpreted as the cratonic lithospheric lid of the region, which may have not been affected by the Mesozoic-Cenozoic deformation process as strongly as other regions in the eastern NCC. Based on our S-wave velocity structural image and other geophysical observations, we propose a possible lithosphere-asthenosphere interaction scenario at the northeastern boundary of the NCC. We speculate that significant undulations of the base of the lithosphere, which might have resulted from the uneven Mesozoic-Cenozoic lithospheric thinning, may induce mantle flows concentrating beneath the weak IMA zone. The relatively thick lithospheric lid in the northern YSB may serve as a tectonic barrier separating the on-craton and off-craton regions into different upper mantle convection systems at the present time. (C) 2008 Elsevier B.V. All rights reserved. |
| WOS关键词 | SINO-KOREAN CRATON ; LITHOSPHERIC THICKNESS ; CONTINENTAL-CRUST ; VELOCITIES BENEATH ; PHASE VELOCITIES ; EASTERN CHINA ; SURFACE-WAVES ; THRUST BELT ; CONSTRAINTS ; EVOLUTION |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000258045800004 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/68918]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Tang, Qunshu |
| 作者单位 | Chinese Acad Sci, Inst Geol & Geophys, Seismol Lab SKL LE, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tang, Qunshu,Chen, Ling. Structure of the crust and uppermost mantle of the Yanshan Belt and adjacent regions at the northeastern boundary of the North China Craton from Rayleigh Wave Dispersion Analysis[J]. TECTONOPHYSICS,2008,455(1-4):43-52. |
| APA | Tang, Qunshu,&Chen, Ling.(2008).Structure of the crust and uppermost mantle of the Yanshan Belt and adjacent regions at the northeastern boundary of the North China Craton from Rayleigh Wave Dispersion Analysis.TECTONOPHYSICS,455(1-4),43-52. |
| MLA | Tang, Qunshu,et al."Structure of the crust and uppermost mantle of the Yanshan Belt and adjacent regions at the northeastern boundary of the North China Craton from Rayleigh Wave Dispersion Analysis".TECTONOPHYSICS 455.1-4(2008):43-52. |
入库方式： OAI收割
来源：地质与地球物理研究所
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