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Crustal thickness over the NW Pacific and its tectonic implications
Bai, Yongliang1,2; Gui, Zhou1,2; Li, Mei3; Dong, Dongdong4; Wu, Shiguo5; Wang, Zhenjie1,2
2019-11-01
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume185Issue:1Pages:11
Abstract

Igneous emplacement on the NW Pacific oceanic crust via mantle activity, such as hot spots and mantle plumes, results in perturbations of crustal thickness. Therefore, mapping crustal thickness variations is key for understanding these mantle structures and processes. Improvements in resolution and accuracy of marine gravity anomalies promote the use of Moho gravity inversion effects, especially for large-scale applications. For improving the Moho gravity inversion accuracy, density variations of the lithospheric mantle are modelled via lithospheric age-temperature-density relationship since age grid with a resolution of 2 arc-minutes is available, and density variations of the mantle beneath lithosphere are modelled via seismic wave velocity-density relationship since velocity structure with penetration to 700 km is available. Comparisons between the Moho geometries by gravity inversion and seismic interpretation demonstrate that the mantle density modelling improves the Moho inversion accuracy. Our crustal map shows that (1) the crustal thickness of 26% of the NW Pacific region is thicker than 7 km; (2) the southern end of the Emperor seamounts was emplaced on the western flank of the Hess Rise, and a part of the central Hawaiian seamounts was emplaced on the eastern end of the Mid-Pacific Mountains; (3) the magma production of Hawaiian seamounts is greater than that of the Emperor seamounts; (4) the leakiness of the fracture along which the Line Islands formed decreases in the order of the central, southern and northern segments.

KeywordMoho geometry Crustal thickness Density modeling NW Pacific Mantle activity
DOI10.1016/j.jseaes.2019.104050
Indexed BySCI
Funding OrganizationNational Natural Science Foundation of China ; Key National Research Project of China ; Fundamental Research Funds for the Central Universities China ; Open Fund of the State Key Laboratory of Earthquake Dynamics
Language英语
Funding ProjectNational Natural Science Foundation of China[U170120019] ; National Natural Science Foundation of China[41976184] ; Key National Research Project of China[2018YFC0603300] ; Fundamental Research Funds for the Central Universities China[17CX02003A] ; Open Fund of the State Key Laboratory of Earthquake Dynamics[LED2019801]
WOS KeywordGRAVITY INVERSION ; INDIAN-OCEAN ; HEAT-FLOW ; MANTLE DENSITY ; MOHO DEPTH ; HESS RISE ; MODEL ; SEDIMENT ; ATLANTIC ; ORIGIN
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000496840600016
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.idsse.ac.cn/handle/183446/7334
Collection深海科学研究部_深海地球物理与资源研究室
Corresponding AuthorBai, Yongliang
Affiliation1.China Univ Petr, Coll Ocean & Space Informat, Qingdao 266580, Shandong, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Shandong, Peoples R China
3.Longitude & Latitude Ctr Qingdao Ecotech Dev Zone, Qingdao 266555, Shandong, Peoples R China
4.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Shandong, Peoples R China
5.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
Recommended Citation
GB/T 7714
Bai, Yongliang,Gui, Zhou,Li, Mei,et al. Crustal thickness over the NW Pacific and its tectonic implications[J]. JOURNAL OF ASIAN EARTH SCIENCES,2019,185(1):11.
APA Bai, Yongliang,Gui, Zhou,Li, Mei,Dong, Dongdong,Wu, Shiguo,&Wang, Zhenjie.(2019).Crustal thickness over the NW Pacific and its tectonic implications.JOURNAL OF ASIAN EARTH SCIENCES,185(1),11.
MLA Bai, Yongliang,et al."Crustal thickness over the NW Pacific and its tectonic implications".JOURNAL OF ASIAN EARTH SCIENCES 185.1(2019):11.
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