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Crustal layering in northeastern Tibet: a case study based on joint inversion of receiver functions and surface wave dispersion

文献类型：期刊论文

作者Deng, Yangfan1,2; Shen, Weisen3; Xu, Tao2,4; Ritzwoller, Michael H.3
刊名GEOPHYSICAL JOURNAL INTERNATIONAL
出版日期2015-10-01
卷号203期号:1页码:692-706
关键词Tomography Surface waves and free oscillations Continental margins: convergent Crustal structure
DOI10.1093/gji/ggv321
文献子类Article
英文摘要Recently constructed models of crustal structure across Tibet based on surface wave data display a prominent mid-crustal low velocity zone (LVZ) but are vertically smooth in the crust. Using six months of broad-band seismic data recorded at 22 stations arrayed approximately linearly over a 440 km observation profile across northeastern Tibet (from the Songpan-Ganzi block, through the Qaidam block, into the Qilian block), we perform a Bayesian Monte Carlo joint inversion of receiver function data with surface wave dispersion to address whether crustal layering is needed to fit both data sets simultaneously. On some intervals a vertically smooth crust is consistent with both data sets, but across most of the observation profile two types of layering are required: a discrete LVZ or high velocity zone (HVZ) formed by two discontinuities in the middle crust and a doublet Moho formed by two discontinuities from 45-50 km to 60-65 km depth connected by a linear velocity gradient in the lowermost crust. The final model possesses (1) a mid-crustal LVZ that extends from the Songpan-Ganzi block through the Kunlun suture into the Qaidam block consistent with partial melt and ductile flow and (2) a mid-crustal HVZ bracketing the south Qilian suture coincident with ultrahigh pressure metamorphic rocks at the surface. (3) Additionally, the model possesses a doublet Moho extending from the Qaidam to the Qilian blocks which probably reflects increased mafic content with depth in the lowermost crust perhaps caused by a vertical gradient of ecologitization. (4) Crustal thickness is consistent with a step-Moho that jumps discontinuously by 6 km from 63.8 km (+/- 1.8 km) south of 35A degrees to 57.8 km (+/- 1.4 km) north of this point coincident with the northern terminus of the mid-crustal LVZ. These results are presented as a guide to future joint inversions across a much larger region of Tibet.
WOS关键词AMBIENT-NOISE TOMOGRAPHY ; BENEATH SE TIBET ; UPPER-MANTLE STRUCTURE ; PHASE-VELOCITY MAPS ; SOUTHERN TIBET ; SEISMIC ARRAY ; LITHOSPHERIC STRUCTURE ; NORTHERN TIBET ; NE TIBET ; CONTINENTAL DEFORMATION
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000366492900048
资助机构State Key Laboratory of Isotope Geochemistry(SKBIG-RC-14-03) ; State Key Laboratory of Isotope Geochemistry(SKBIG-RC-14-03) ; State Key Laboratory of Isotope Geochemistry(SKBIG-RC-14-03) ; State Key Laboratory of Isotope Geochemistry(SKBIG-RC-14-03) ; National Science Foundation of China(41021063) ; National Science Foundation of China(41021063) ; National Science Foundation of China(41021063) ; National Science Foundation of China(41021063) ; NSF(EAR-1246925) ; NSF(EAR-1246925) ; NSF(EAR-1246925) ; NSF(EAR-1246925) ; Seismological Facilities for the Advancement of Geoscience and EarthScope (SAGE) Proposal of the National Science Foundation(EAR-1261681) ; Seismological Facilities for the Advancement of Geoscience and EarthScope (SAGE) Proposal of the National Science Foundation(EAR-1261681) ; Seismological Facilities for the Advancement of Geoscience and EarthScope (SAGE) Proposal of the National Science Foundation(EAR-1261681) ; Seismological Facilities for the Advancement of Geoscience and EarthScope (SAGE) Proposal of the National Science Foundation(EAR-1261681) ; National Science Foundation(CNS-0821794) ; National Science Foundation(CNS-0821794) ; National Science Foundation(CNS-0821794) ; National Science Foundation(CNS-0821794) ; State Key Laboratory of Isotope Geochemistry(SKBIG-RC-14-03) ; State Key Laboratory of Isotope Geochemistry(SKBIG-RC-14-03) ; State Key Laboratory of Isotope Geochemistry(SKBIG-RC-14-03) ; State Key Laboratory of Isotope Geochemistry(SKBIG-RC-14-03) ; National Science Foundation of China(41021063) ; National Science Foundation of China(41021063) ; National Science Foundation of China(41021063) ; National Science Foundation of China(41021063) ; NSF(EAR-1246925) ; NSF(EAR-1246925) ; NSF(EAR-1246925) ; NSF(EAR-1246925) ; Seismological Facilities for the Advancement of Geoscience and EarthScope (SAGE) Proposal of the National Science Foundation(EAR-1261681) ; Seismological Facilities for the Advancement of Geoscience and EarthScope (SAGE) Proposal of the National Science Foundation(EAR-1261681) ; Seismological Facilities for the Advancement of Geoscience and EarthScope (SAGE) Proposal of the National Science Foundation(EAR-1261681) ; Seismological Facilities for the Advancement of Geoscience and EarthScope (SAGE) Proposal of the National Science Foundation(EAR-1261681) ; National Science Foundation(CNS-0821794) ; National Science Foundation(CNS-0821794) ; National Science Foundation(CNS-0821794) ; National Science Foundation(CNS-0821794)
源URL[http://ir.iggcas.ac.cn/handle/132A11/62141]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Univ Colorado, Dept Phys, Boulder, CO 80309 USA
4.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
推荐引用方式
GB/T 7714		 Deng, Yangfan,Shen, Weisen,Xu, Tao,et al. Crustal layering in northeastern Tibet: a case study based on joint inversion of receiver functions and surface wave dispersion[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2015,203(1):692-706.
APA Deng, Yangfan,Shen, Weisen,Xu, Tao,&Ritzwoller, Michael H..(2015).Crustal layering in northeastern Tibet: a case study based on joint inversion of receiver functions and surface wave dispersion.GEOPHYSICAL JOURNAL INTERNATIONAL,203(1),692-706.
MLA Deng, Yangfan,et al."Crustal layering in northeastern Tibet: a case study based on joint inversion of receiver functions and surface wave dispersion".GEOPHYSICAL JOURNAL INTERNATIONAL 203.1(2015):692-706.

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来源：地质与地球物理研究所

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