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  2. 地质与地球物理研究所
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  4. 岩石圈演化国家重点实验室
Enigmatic crustal and upper mantle structure in the NE Sino-Korean Craton based on nuclear explosion seismic data

文献类型：期刊论文

作者Zhang, Xiaoqing4,5; Thybo, Hans1,2,3; Artemieva, Irina M.2,3,6,8; Xu, Tao5,7
刊名JOURNAL OF GEODYNAMICS
出版日期2023-03-01
卷号155页码:16
ISSN号0264-3707
关键词Nuclear explosion Thin lower crust Intra-Lithospheric discontinuity Mid-Lithospheric discontinuity Low velocity zone Upper mantle inhomogeneity
DOI10.1016/j.jog.2022.101957
英文摘要We interpret the crustal and upper mantle structure along-2500 km long seismic profiles in the northeastern part of the Sino-Korean Craton (SKC). The seismic data with high signal-to-noise ratio were acquired with a nuclear explosion in North Korea as source. Seismic sections show several phases including Moho reflections (PmP) and their surface multiple (PmPPmP), upper mantle refractions (P), primary reflections (PxP, PL, P410), exceptionally strong multiple reflections from the Moho (PmPPxP), and upper mantle scattering phases, which we model by ray-tracing and synthetic seismograms for a 1-D fine-scale velocity model. The observations require a thin crust (30 km) with a very low average crustal velocity (ca. 6.15 km/s) and exceptionally strong velocity contrast at the Moho discontinuity, which can be explained by a thin Moho transition zone (< 5 km thick) with strong horizontal anisotropy. We speculate that this anisotropy was induced by lower crustal flow during delamination dripping. An intra-lithospheric discontinuity (ILD) at-75 km depth with positive velocity contrast is probably caused by the phase transformation from spinel to garnet. Delayed first arrivals followed by a long wave train of scattered phases of up to 4 s duration are observed in the 800-1300 km offset range, which are modelled by continuous stochastic velocity fluctuations in a low-velocity zone (LVZ) below the Mid-Lithospheric Discontinuity (MLD) between 120 and 190 km depth. The average velocity of this LVZ is about 8.05 km/s, which is much lower than the IASP91 standard model. This LVZ is most likely caused by rocks which are either partially molten or close to the solidus, which explains both low velocity and the heterogeneous structure.
WOS关键词NORTH CHINA CRATON ; LITHOSPHERE-ASTHENOSPHERE BOUNDARY ; VELOCITY STRUCTURE BENEATH ; TRANSITION ZONE ; EASTERN CHINA ; DISCONTINUITY ; DESTRUCTION ; EVOLUTION ; PROFILE ; ANISOTROPY
资助项目National Science Foundation of China[92055210] ; MOST special funds of China[GPMR2019010] ; National Natural Science Foundation of China[42130807] ; National Natural Science Foundation of China[41974048] ; National Natural Science Foundation of China[42104042] ; National Natural Science Foundation of China[42104040]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号WOS:000906542600001
资助机构National Science Foundation of China ; National Science Foundation of China ; MOST special funds of China ; MOST special funds of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; MOST special funds of China ; MOST special funds of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; MOST special funds of China ; MOST special funds of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; MOST special funds of China ; MOST special funds of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/106944]  
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Thybo, Hans
作者单位1.Istanbul Tech Univ, Eurasia Inst Earth Sci, TR-34469 Maslak, I?stanbul, Turkey
2.China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan, Peoples R China
3.Chinese Acad Geol Sci, Sino Probe Lab, Beijing, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Inst Geol & Geophys, Chinese Acad Sci, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
6.GEOMAR Helmholtz Ctr Ocean Res, Sect Marine Geodynam, D-24148 Kiel, Germany
7.Innovat Acad Earth Sci, CAS, Beijing 100029, Peoples R China
8.Stanford Univ, Dept Geophys, Stanford, CA 94305 USA
推荐引用方式
GB/T 7714		 Zhang, Xiaoqing,Thybo, Hans,Artemieva, Irina M.,et al. Enigmatic crustal and upper mantle structure in the NE Sino-Korean Craton based on nuclear explosion seismic data[J]. JOURNAL OF GEODYNAMICS,2023,155:16.
APA Zhang, Xiaoqing,Thybo, Hans,Artemieva, Irina M.,&Xu, Tao.(2023).Enigmatic crustal and upper mantle structure in the NE Sino-Korean Craton based on nuclear explosion seismic data.JOURNAL OF GEODYNAMICS,155,16.
MLA Zhang, Xiaoqing,et al."Enigmatic crustal and upper mantle structure in the NE Sino-Korean Craton based on nuclear explosion seismic data".JOURNAL OF GEODYNAMICS 155(2023):16.

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来源：地质与地球物理研究所

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