气候变化领域集成服务门户(CCPortal): Joint modeling of lithosphere and mantle dynamics: Sensitivity to viscosities within the lithosphere, asthenosphere, transition zone, and D '' layers

CCPortal

DOI	10.1016/j.pepi.2019.05.006
	Joint modeling of lithosphere and mantle dynamics: Sensitivity to viscosities within the lithosphere, asthenosphere, transition zone, and D '' layers
	Wang, Xinguo; Holt, William E.; Ghosh, Attreyee
通讯作者	Wang, XG (通讯作者)
发表日期	2019
ISSN	0031-9201
EISSN	1872-7395
卷号	293
英文摘要	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.
关键词	GLACIAL ISOSTATIC-ADJUSTMENT MOLTEN UPPER-MANTLE PLATE MOTIONS EARTHS MANTLE EXPERIMENTAL CONSTRAINTS SUBDUCTED SLABS SHEAR-VELOCITY STRESS-FIELD GLOBAL-MODEL RHEOLOGY
英文关键词	Mantle viscosity; Geoid; Plate motion; Strain rate; Lithosphere; Asthenosphere
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000479018800001
来源期刊	PHYSICS OF THE EARTH AND PLANETARY INTERIORS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259581
推荐引用方式 GB/T 7714	Wang, Xinguo,Holt, William E.,Ghosh, Attreyee. Joint modeling of lithosphere and mantle dynamics: Sensitivity to viscosities within the lithosphere, asthenosphere, transition zone, and D '' layers[J]. 中国科学院青藏高原研究所,2019,293.
APA	Wang, Xinguo,Holt, William E.,&Ghosh, Attreyee.(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.
MLA	Wang, Xinguo,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(2019).