Distinct lateral variation of lithospheric thickness in the northeastern North China Craton
文献类型：期刊论文
| 作者 | Chen, Ling; Tao, Wang; Zhao, Liang; Zheng, Tianyu |
| 刊名 | EARTH AND PLANETARY SCIENCE LETTERS
 |
| 出版日期 | 2008-03-01 |
| 卷号 | 267期号:1-2页码:56-68 |
| 关键词 | lithosphere-asthenosphere boundary northeastern North China Craton S-receiver functions lithospheric reactivation |
| ISSN号 | 0012-821X |
| DOI | 10.1016/j.epsi.2007.11.024 |
| 文献子类 | Article |
| 英文摘要 | A detailed knowledge of the thickness of the lithosphere in the northeastern North China Craton (NCC) is important for understanding the significant tectonic reactivation of the craton in the Mesozoic and Cenozoic time. We achieve this goal by applying the newly proposed wave equation-based migration technique to the S-receiver functions recently collected in the region. Distinct negative signals are identified below the Moho in all the S-receiver function-migrated images and stacks, which we interpret as representing the S-to-P conversions from the lithosphere-asthenosphere boundary (LAB). The imaged LAB is as shallow as similar to 60-70 kin in the southeast basin and coastal areas and deepens to no more than 140 kin in the northwest mountain ranges and continental interior. These observations indicate widespread lithospheric thinning in the study region in comparison with the > 180-km lithospheric thicknesses typical of most cratonic regions. The revealed topography of the LAB generally agrees with the lateral variation in upper mantle seismic anisotropy previously measured through SKS splitting analysis. In particular, a sharp LAB step of similar to 40 km is detected at the triple junction of the basin and mountains, at almost the same place where an abrupt change from NW-SE to NE-SW in fast polarization direction of shear waves was found. These findings suggest a close correlation between the seismic anisotropy and hence deformation of the upper mantle, the lithospheric thickness, and the surface tectonics of the northeastern NCC. While the thinned lithosphere and the NW-SE fast shear wave polarizations in the east areas probably are related to the dominant NW-SE tectonic extension in the late Mesozoic-Cenozoic time, the thicker lithosphere and the NE-SW fast polarization direction in the west mountain ranges may reflect earlier contractional deformations of the region. Synthetic tests indicate that the LAB beneath the northeastern NCC is a well-defined zone 10-20 km thick. Combined with seismic tomography results and geochemical and petrological data, this suggests that complex modification of the lithosphere probably accompanied significant lithospheric thinning during the tectonic reactivation of the old craton. (C) 2007 Elsevier B.V. All rights reserved. |
| WOS关键词 | SINO-KOREAN CRATON ; LOWER CONTINENTAL-CRUST ; UPPER-MANTLE BENEATH ; EASTERN CHINA ; SOUTH CHINA ; ASTHENOSPHERE BOUNDARY ; KAAPVAAL CRATON ; EVOLUTION ; XENOLITHS ; CONSTRAINTS |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000254684000005 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/70164]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Chen, Ling |
| 作者单位 | Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Seismol Lab, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Ling,Tao, Wang,Zhao, Liang,et al. Distinct lateral variation of lithospheric thickness in the northeastern North China Craton[J]. EARTH AND PLANETARY SCIENCE LETTERS,2008,267(1-2):56-68. |
| APA | Chen, Ling,Tao, Wang,Zhao, Liang,&Zheng, Tianyu.(2008).Distinct lateral variation of lithospheric thickness in the northeastern North China Craton.EARTH AND PLANETARY SCIENCE LETTERS,267(1-2),56-68. |
| MLA | Chen, Ling,et al."Distinct lateral variation of lithospheric thickness in the northeastern North China Craton".EARTH AND PLANETARY SCIENCE LETTERS 267.1-2(2008):56-68. |
入库方式： OAI收割
来源：地质与地球物理研究所
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