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  2. 地质与地球物理研究所
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Complicated crustal deformation beneath the NE margin of the Tibetan plateau and its adjacent areas revealed by multi-station receiver-function gathering

文献类型：期刊论文

作者Xu, Xiaoming1,2,3; Niu, Fenglin2,4,5; Ding, Zhifeng1; Chen, Qifu3
刊名EARTH AND PLANETARY SCIENCE LETTERS
出版日期2018-09-01
卷号497页码:204-216
关键词cluster analysis receiver function crustal anisotropy crustal deformation NE Tibet ChinaArray
ISSN号0012-821X
DOI10.1016/j.epsl.2018.06.010
文献子类Article
英文摘要We use a multi-station stacking method to analyze receiver function data recorded by a large-scale dense seismic array covering the northeastern (NE) margin of the Tibetan plateau and its adjacent regions to estimate crustal thickness (H), Vp/Vs ratio (kappa) and crustal anisotropy (fast polarization direction phi and splitting time tau). For each station of the array, we gathered all the receiver functions recorded by the station and its nearby stations located inside a circle with a radius of 0.5 degrees. We applied the H-kappa stacking technique and the joint inversion scheme to a total of 654 station clusters to measure the (H, kappa) and (phi, tau), respectively. The measured Moho depth varies from a peak value of 67 km beneath the northern-central plateau to 39-45 km beneath the surrounding blocks in the northeast. The front of the depressed Moho beneath the plateau margin exhibits a complicated geometry, which suggests that when the Tibetan plateau encroached upon the surrounding terranes, the front expanded unevenly depending on the strength of the encountering terranes. The thickened crust beneath the margin also has a very low Vp/Vs ratio, indicating that the crust is composed largely of felsic minerals. More than one third of the station clusters (221) have a splitting time significantly larger than 0.2 s. The average splitting times of the 221 measurements is 0.68 s, which is comparable to those measured from the SKS/SKKS (XKS) phases (0.94 s). The fast directions estimated from the Moho Ps and XKS phases recorded by the station clusters within the margin are very similar, and are also approximately parallel to the strikes of major faults, sutures and thrust fronts in the area. The low Vp/Vs ratio, together with the observed fast polarization directions from the Moho Ps and XKS phases, suggests that shortening of the entire lithosphere orthogonal to the compressional direction is likely the main cause for the observed crustal thickening occurring at the margin. We also found that the Moho Ps and XKS recorded by stations inside the western Hetao basin and the Yinchuan basin present very different anisotropy, which may suggest that the crust and mantle beneath the two basins have very different deformation patterns. (C) 2018 Elsevier B.V. All rights reserved.
WOS关键词UPPER-MANTLE STRUCTURE ; SEISMIC ANISOTROPY ; NORTHEASTERN MARGIN ; POISSONS RATIO ; JOINT ANALYSIS ; EARTHS CRUST ; HEAT-FLOW ; SE TIBET ; CHINA ; TOMOGRAPHY
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000440529100020
出版者ELSEVIER SCIENCE BV
资助机构National Key R&D Program of China(2017YFC1500303) ; National Key R&D Program of China(2017YFC1500303) ; National Key R&D Program of China(2017YFC1500303) ; National Key R&D Program of China(2017YFC1500303) ; National Natural Science Foundation of China(41604074 ; National Natural Science Foundation of China(41604074 ; National Natural Science Foundation of China(41604074 ; National Natural Science Foundation of China(41604074 ; China National Special Fund for Earthquake Scientific Research in Public Interest Science(201308011) ; China National Special Fund for Earthquake Scientific Research in Public Interest Science(201308011) ; China National Special Fund for Earthquake Scientific Research in Public Interest Science(201308011) ; China National Special Fund for Earthquake Scientific Research in Public Interest Science(201308011) ; 41630209) ; 41630209) ; 41630209) ; 41630209) ; National Key R&D Program of China(2017YFC1500303) ; National Key R&D Program of China(2017YFC1500303) ; National Key R&D Program of China(2017YFC1500303) ; National Key R&D Program of China(2017YFC1500303) ; National Natural Science Foundation of China(41604074 ; National Natural Science Foundation of China(41604074 ; National Natural Science Foundation of China(41604074 ; National Natural Science Foundation of China(41604074 ; China National Special Fund for Earthquake Scientific Research in Public Interest Science(201308011) ; China National Special Fund for Earthquake Scientific Research in Public Interest Science(201308011) ; China National Special Fund for Earthquake Scientific Research in Public Interest Science(201308011) ; China National Special Fund for Earthquake Scientific Research in Public Interest Science(201308011) ; 41630209) ; 41630209) ; 41630209) ; 41630209) ; National Key R&D Program of China(2017YFC1500303) ; National Key R&D Program of China(2017YFC1500303) ; National Key R&D Program of China(2017YFC1500303) ; National Key R&D Program of China(2017YFC1500303) ; National Natural Science Foundation of China(41604074 ; National Natural Science Foundation of China(41604074 ; National Natural Science Foundation of China(41604074 ; National Natural Science Foundation of China(41604074 ; China National Special Fund for Earthquake Scientific Research in Public Interest Science(201308011) ; China National Special Fund for Earthquake Scientific Research in Public Interest Science(201308011) ; China National Special Fund for Earthquake Scientific Research in Public Interest Science(201308011) ; China National Special Fund for Earthquake Scientific Research in Public Interest Science(201308011) ; 41630209) ; 41630209) ; 41630209) ; 41630209) ; National Key R&D Program of China(2017YFC1500303) ; National Key R&D Program of China(2017YFC1500303) ; National Key R&D Program of China(2017YFC1500303) ; National Key R&D Program of China(2017YFC1500303) ; National Natural Science Foundation of China(41604074 ; National Natural Science Foundation of China(41604074 ; National Natural Science Foundation of China(41604074 ; National Natural Science Foundation of China(41604074 ; China National Special Fund for Earthquake Scientific Research in Public Interest Science(201308011) ; China National Special Fund for Earthquake Scientific Research in Public Interest Science(201308011) ; China National Special Fund for Earthquake Scientific Research in Public Interest Science(201308011) ; China National Special Fund for Earthquake Scientific Research in Public Interest Science(201308011) ; 41630209) ; 41630209) ; 41630209) ; 41630209)
源URL[http://ir.iggcas.ac.cn/handle/132A11/88147]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Niu, Fenglin
作者单位1.China Earthquake Adm, Inst Geophys, Beijing, Peoples R China
2.Rice Univ, Dept Earth Environm & Planetary Sci, Houston, TX 77005 USA
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
4.China Univ Petr, State Key Lab Petr Resource & Prospecting, Beijing, Peoples R China
5.China Univ Petr, Unconvent Nat Gas Inst, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Xu, Xiaoming,Niu, Fenglin,Ding, Zhifeng,et al. Complicated crustal deformation beneath the NE margin of the Tibetan plateau and its adjacent areas revealed by multi-station receiver-function gathering[J]. EARTH AND PLANETARY SCIENCE LETTERS,2018,497:204-216.
APA Xu, Xiaoming,Niu, Fenglin,Ding, Zhifeng,&Chen, Qifu.(2018).Complicated crustal deformation beneath the NE margin of the Tibetan plateau and its adjacent areas revealed by multi-station receiver-function gathering.EARTH AND PLANETARY SCIENCE LETTERS,497,204-216.
MLA Xu, Xiaoming,et al."Complicated crustal deformation beneath the NE margin of the Tibetan plateau and its adjacent areas revealed by multi-station receiver-function gathering".EARTH AND PLANETARY SCIENCE LETTERS 497(2018):204-216.

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来源：地质与地球物理研究所

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