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Joint modeling of lithosphere and mantle dynamics: Sensitivity to viscosities within the lithosphere, asthenosphere, transition zone, and D '' layers
Wang, XG (Wang, Xinguo)1,2,3; Holt, WE (Holt, William E.)3; Ghosh, A (Ghosh, Attreyee)4
Source PublicationPHYSICS OF THE EARTH AND PLANETARY INTERIORS
2019
Volume293Issue:0Pages:106263
DOI10.1016/j.pepi.2019.05.006
Abstract

Although mantle rheology is one of the most important properties of the Earth, how a radial mantle viscosity structure affects lithosphere dynamics is still poorly known, particularly the role of the lithosphere, asthenosphere, transition zone, and D '' layer viscosities. Using constraints from the geoid, plate motions, and strain rates within plate boundary zones, we provide important new refinements to the radial viscosity profile within the key layers of the lithosphere, asthenosphere, transition zone, and D '' layer. We follow the approach of the joint modeling of lithosphere and mantle dynamics (Ghosh and Holt, 2012; Ghosh et al., 2013b, 2019; Wang et al., 2015) to show how the viscosities within these key layers influence lithosphere dynamics. We use the viscosity structure SH08 (Steinberger and Holme, 2008) as a starting model. The density variations within the mantle are derived from the tomography models which, based on prior modeling, had provided a best fit to the surface observables (Wang et al., 2015). Our results show that narrow viscosity ranges of moderately strong lithosphere (2.6-5.6 x 10(22) Pa-s) and moderately weak transition zone (5-9.3 x 10(20) Pa-s), as well as slightly large ranges of moderately weak asthenosphere (5-34 x 10(19) Pa-s) and D '' layer (4.8-18 x 10(20) Pa-s), are necessary to match all the surface observables. We also find that a very strong lithosphere (> 8.6 x 10(22) Pa-s) along with a weak asthenosphere (< 5.4 x 10(19) Pa-s) fits well with the surface observables. Our results show that the geoid is very sensitive to the viscosities of both the transition zone and D '' layer, while plate motions are slightly sensitive to them, but the orientations of stresses are insensitive to them.

Subject AreaGeosciences
WOS IDWOS:000479018800001
Language英语
Indexed BySCI
KeywordGlacial Isostatic-adjustment Molten Upper-mantle Plate Motions Earths Mantle Experimental Constraints Subducted Slabs Shear-velocity Stress-field Global-model Rheology
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
Cooperation Status国际
ISSN0031-9201
Department大陆碰撞与高原隆升重点实验室
URL查看原文
PublisherELSEVIER
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9211
Collection图书馆
Corresponding AuthorWang, XG (Wang, Xinguo)
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing, Peoples R China;
2.China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing, Peoples R China;
3.SUNY Stony Brook, Dept Geosci, Stony Brook, NY 11794 USA;
4.Indian Inst Sci, Ctr Earth Sci, Bangalore, Karnataka, India.
Recommended Citation
GB/T 7714
Wang, XG ,Holt, WE ,Ghosh, A . Joint modeling of lithosphere and mantle dynamics: Sensitivity to viscosities within the lithosphere, asthenosphere, transition zone, and D '' layers[J]. PHYSICS OF THE EARTH AND PLANETARY INTERIORS,2019,293(0):106263.
APA Wang, XG ,Holt, WE ,&Ghosh, A .(2019).Joint modeling of lithosphere and mantle dynamics: Sensitivity to viscosities within the lithosphere, asthenosphere, transition zone, and D '' layers.PHYSICS OF THE EARTH AND PLANETARY INTERIORS,293(0),106263.
MLA Wang, XG ,et al."Joint modeling of lithosphere and mantle dynamics: Sensitivity to viscosities within the lithosphere, asthenosphere, transition zone, and D '' layers".PHYSICS OF THE EARTH AND PLANETARY INTERIORS 293.0(2019):106263.
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