DOI: 10.1002/2015GL063483
论文题名: Formation of ridges in a stable lithosphere in mantle convection models with a viscoplastic rheology
作者: Rozel A. ; Golabek G.J. ; Näf R. ; Tackley P.J.
刊名: Geophysical Research Letters
ISSN: 0094-8690
EISSN: 1944-8421
出版年: 2015
卷: 42, 期: 12 起始页码: 4770
结束页码: 4777
语种: 英语
英文关键词: convection regime
; depth dependent
; ridge only
; viscoplastic
; yield stress
Scopus关键词: Elasticity
; Friction
; Heating
; Viscosity
; Convection regime
; Depth dependents
; Friction coefficients
; Mantle convection
; Mantle convection models
; Ridge only
; Viscoplastic
; Viscosity contrast
; Yield stress
; friction
; geological structure
; heating
; lithosphere
; mantle convection
; numerical model
; rheology
; subduction zone
; vertical distribution
; viscoplasticity
英文摘要: Numerical simulations of mantle convection with a viscoplastic rheology usually display mobile, episodic or stagnant lid regimes. In this study, we report a new convective regime in which a ridge can form without destabilizing the surrounding lithosphere or forming subduction zones. Using simulations in 2-D spherical annulus geometry, we show that a depth-dependent yield stress is sufficient to reach this ridge only regime. This regime occurs when the friction coefficient is close to the critical value between mobile lid and stagnant lid regimes. Maps of convective regime as a function of the parameters friction coefficients and depth dependence of viscosity are provided for both basal heating and mixed heating situations. The ridge only regime appears for both pure basal heating and mixed heating mode. For basal heating, this regime can occur for all vertical viscosity contrasts, while for mixed heating, a highly viscous deep mantle is required. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84948719679&doi=10.1002%2f2015GL063483&partnerID=40&md5=643a1b8d14563565037030f3d4b257cc
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8306
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Institute of Geophysics, Department of Earth Sciences, ETH Zurich, Zurich, Switzerland
Recommended Citation:
Rozel A.,Golabek G.J.,Näf R.,et al. Formation of ridges in a stable lithosphere in mantle convection models with a viscoplastic rheology[J]. Geophysical Research Letters,2015-01-01,42(12).