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Crustal S-velocity structure and radial anisotropy beneath the southern part of central and western North China Craton and the adjacent Qilian Orogenic Belt from ambient noise tomography

文献类型：期刊论文

作者Ling, Yuan1,2; Chen, Ling1,2,3; Wei, ZiGen4; Jiang, MingMing5; Wang, Xu1,2
刊名SCIENCE CHINA-EARTH SCIENCES
出版日期2017-10-01
卷号60期号:10页码:1752-1768
关键词North China Craton Qilian Orogenic Belt Ambient noise tomography Crustal S-velocity structure Radial anisotropy
ISSN号1674-7313
DOI10.1007/s11430-017-9092-8
文献子类Article
英文摘要The crustal S-velocity structure and radial anisotropy along a dense linear portable seismic array with 64 broadband seismic stations were investigated from ambient noise tomography with about one-year-long ambient noise recordings. The array transverses the southern part of the central North China Craton (CNCC) and western NCC (WNCC) from east to west and reaches the adjacent Qilian Orogenic Belt (QOB). The phase velocity structures of Rayleigh waves at 5-35 s and Love waves at 5-30 s were measured. The crustal S-velocity structures (V (sv) and V (sh)) were constructed from the dispersion data (Rayleigh and Love waves, respectively) from point-wise linear inversion with prior information of the Moho depth and average crustal V (p)/V (s) ratio. The radial anisotropy along the profile was calculated based on the discrepancies between V (sv) and V (sh) as 2x(V (sh)-V (sv))/(V (sh)+V (sv)). The results show distinct structural variations in the three major tectonic units. The crustal architecture in the southern CNCC is complicated and featured with wide-distributed low-velocity zones (LVZs), which may be a reflection of crustal modification resulting from Mesozoic-Cenozoic tectonics and magmatic activities. The pronounced positive radial anisotropy in the lower-lowermost crust beneath the Shanxi-Shaanxi Rift and the neighboring areas could be attributed to the underplating of mantle mafic-ultramafic materials during the Mesozoic-Cenozoic tectonic activation. In southern Ordos, the overall weak lateral velocity variations, relative high velocity and large-scale positive radial anisotropy in mid-lower crust probably suggest that the current crustal structure has preserved its Precambrian tectonic characteristics. The low-velocity westward-dipping sedimentary strata in the Ordos Block could be attributed to the Phanerozoic whole-basin tilting and the uneven erosion since late Cretaceous. Integrated with previous studies, the systematic comparison of crustal architecture was made between the southern and northern part of CNCC-WNCC. The similarities and differences may have a relation with the tectonic events and deformation histories experienced before and after the Paleoproterozoic amalgamation of the NCC. The nearly flat mid-crustal LVZ beneath the southern QOB weakens gradually as it extends to the east, which is a feature probably associated with crustal vertical superpositionand ductile shear deformation under the intensive compressional regime due to the northeastward growth and expansion of the Tibetan Plateau.
WOS关键词UPPER-MANTLE STRUCTURE ; SINO-KOREAN CRATON ; NORTHEASTERN TIBETAN PLATEAU ; RAYLEIGH-WAVE TOMOGRAPHY ; TECTONIC IMPLICATIONS ; SEISMIC NOISE ; ORDOS BLOCK ; LITHOSPHERIC THICKNESS ; 2-STATION ANALYSIS ; RECEIVER FUNCTIONS
WOS研究方向Geology
语种英语
WOS记录号WOS:000412466600002
出版者SCIENCE PRESS
资助机构National Natural Science Foundation of China(41225016 ; National Natural Science Foundation of China(41225016 ; Chinese Academy of Sciences(XDB03010802) ; Chinese Academy of Sciences(XDB03010802) ; 91414301 ; 91414301 ; 41688103) ; 41688103) ; National Natural Science Foundation of China(41225016 ; National Natural Science Foundation of China(41225016 ; Chinese Academy of Sciences(XDB03010802) ; Chinese Academy of Sciences(XDB03010802) ; 91414301 ; 91414301 ; 41688103) ; 41688103) ; National Natural Science Foundation of China(41225016 ; National Natural Science Foundation of China(41225016 ; Chinese Academy of Sciences(XDB03010802) ; Chinese Academy of Sciences(XDB03010802) ; 91414301 ; 91414301 ; 41688103) ; 41688103) ; National Natural Science Foundation of China(41225016 ; National Natural Science Foundation of China(41225016 ; Chinese Academy of Sciences(XDB03010802) ; Chinese Academy of Sciences(XDB03010802) ; 91414301 ; 91414301 ; 41688103) ; 41688103)
源URL[http://ir.iggcas.ac.cn/handle/132A11/61939]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Chen, Ling
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
4.Chinese Acad Sci, Inst Geodesy & Geophys, State Key Lab Geodesy & Earths Dynam, Wuhan 430077, Peoples R China
5.Chinese Acad Sci, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Ling, Yuan,Chen, Ling,Wei, ZiGen,et al. Crustal S-velocity structure and radial anisotropy beneath the southern part of central and western North China Craton and the adjacent Qilian Orogenic Belt from ambient noise tomography[J]. SCIENCE CHINA-EARTH SCIENCES,2017,60(10):1752-1768.
APA Ling, Yuan,Chen, Ling,Wei, ZiGen,Jiang, MingMing,&Wang, Xu.(2017).Crustal S-velocity structure and radial anisotropy beneath the southern part of central and western North China Craton and the adjacent Qilian Orogenic Belt from ambient noise tomography.SCIENCE CHINA-EARTH SCIENCES,60(10),1752-1768.
MLA Ling, Yuan,et al."Crustal S-velocity structure and radial anisotropy beneath the southern part of central and western North China Craton and the adjacent Qilian Orogenic Belt from ambient noise tomography".SCIENCE CHINA-EARTH SCIENCES 60.10(2017):1752-1768.

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来源：地质与地球物理研究所

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