Growth of the lower continental crust via the relamination of arc magma
文献类型：期刊论文
| 作者 | He, Yumei1,2; Zheng, Tianyu1; Ai, Yinshuang1,2; Hou, Guangbing1; Chen, Qi-Fu1 |
| 刊名 | TECTONOPHYSICS
 |
| 出版日期 | 2018-01-31 |
| 卷号 | 724页码:42-50 |
| 关键词 | Growth of continental crust Relamination Crustal velocity structure Receiver function imaging Ordos terrane |
| ISSN号 | 0040-1951 |
| DOI | 10.1016/j.tecto.2018.01.006 |
| 文献子类 | Article |
| 英文摘要 | How does continental crust transition from basaltic mantle-derived magmas into an andesitic composition? The relamination hypothesis has been presented as an alternative dynamical mechanism to classical delamination theory to explain new crust generation and has been supported by petrological and geochemical studies as well as by thermomechanical numerical modeling. However, direct evidence of this process from detailed seismic velocity structures is lacking. Here, we imaged the three-dimensional (3D) velocity structures of the crust and uppermost mantle beneath the geologically stable Ordos terrane of the North China Craton (NCC). We identify a region of continental crust that exhibits extreme growth using teleseismic data and an imaging technique that models the Common Conversion Point (CCP) stacking profiles. Our results show an approximately 400 x 400 km(2) wide growth zone that underlies the primitive crust at depths of similar to 30-50 km and exhibits a gradual increase of velocity with depth. The upper layer of the growth zone has a shear wave velocity of 3.6-3.9 km/s (Vp = 6.2-6.8 km/s), indicating felsic material, and the lower layer has a shear wave velocity of 4.1-4.3 km/s (Vp = 7.2-7.5 km/s), which corresponds to mafic material. We suggest that this vertical evolution of the layered structure could be created by relamination and that the keel structure formed by relamination may be the root of the supernormal stability of the ancient Ordos terrane. |
| WOS关键词 | NORTH CHINA CRATON ; CENOZOIC TECTONIC EVOLUTION ; ORDOS BASIN ; SOUTHERN CALIFORNIA ; TIBETAN PLATEAU ; BENEATH ; MARGIN ; SEISMOLOGY ; SUBDUCTION ; ALGORITHM |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000425569800004 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | National Natural Science Foundation of China(41490612 ; National Natural Science Foundation of China(41490612 ; 91414301) ; 91414301) ; National Natural Science Foundation of China(41490612 ; National Natural Science Foundation of China(41490612 ; 91414301) ; 91414301) ; National Natural Science Foundation of China(41490612 ; National Natural Science Foundation of China(41490612 ; 91414301) ; 91414301) ; National Natural Science Foundation of China(41490612 ; National Natural Science Foundation of China(41490612 ; 91414301) ; 91414301) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/82824]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Zheng, Tianyu |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China 2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | He, Yumei,Zheng, Tianyu,Ai, Yinshuang,et al. Growth of the lower continental crust via the relamination of arc magma[J]. TECTONOPHYSICS,2018,724:42-50. |
| APA | He, Yumei,Zheng, Tianyu,Ai, Yinshuang,Hou, Guangbing,&Chen, Qi-Fu.(2018).Growth of the lower continental crust via the relamination of arc magma.TECTONOPHYSICS,724,42-50. |
| MLA | He, Yumei,et al."Growth of the lower continental crust via the relamination of arc magma".TECTONOPHYSICS 724(2018):42-50. |
入库方式： OAI收割
来源：地质与地球物理研究所
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