Growth of the lower continental crust via the relamination of arc magma

doi:10.1016/j.tecto.2018.01.006

	Growth of the lower continental crust via the relamination of arc magma
	He, Yumei 1,2; Zheng, Tianyu 1; Ai, Yinshuang 1,2; Hou, Guangbing 1; Chen, Qi-Fu 1
刊名	TECTONOPHYSICS
	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
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000425569800004
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)
内容类型	期刊论文
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.