scholarly journals Joint modeling of lithosphere and mantle dynamics: Evaluation of constraints from global tomography models

2015 ◽  
Vol 120 (12) ◽  
pp. 8633-8655 ◽  
Author(s):  
Xinguo Wang ◽  
William E. Holt ◽  
Attreyee Ghosh
Keyword(s):  
Joint Modeling ◽  
Mantle Dynamics

scholarly journals Joint modeling of lithosphere and mantle dynamics elucidating lithosphere-mantle coupling

2008 ◽  
Vol 35 (16) ◽  
Author(s):  
A. Ghosh ◽  
W. E. Holt ◽  
L. Wen ◽  
A. J. Haines ◽  
L. M. Flesch
Keyword(s):  
Joint Modeling ◽  
Mantle Dynamics

Video Object Segmentation Research Based on Features Joint Modeling

2014 ◽  
Vol 36 (11) ◽  
pp. 2356-2363
Author(s):  
Zong-Min LI ◽  
Xu-Chao GONG ◽  
Yu-Jie LIU
Keyword(s):  
Object Segmentation ◽  
Joint Modeling ◽  
Video Object Segmentation ◽  
Video Object

LITHOSPHERE STRUCTURE AND MANTLE DYNAMICS AT THE WESTERN EDGE OF THE LAURENTIAN CRATON

2020 ◽  
Author(s):  
Claire Currie ◽  
◽  
Andrew J. Schaeffer ◽  
Pascal Audet ◽  
Deirdre Mallyon
Keyword(s):  
Mantle Dynamics ◽  
Lithosphere Structure

scholarly journals Feedbacks between a non-Newtonian upper mantle, mantle viscosity structure and mantle dynamics

2020 ◽  
Vol 224 (2) ◽  
pp. 961-972
Author(s):  
A G Semple ◽  
A Lenardic
Keyword(s):  
Upper Mantle ◽  
Lower Mantle ◽  
Mantle Convection ◽  
Mantle Flow ◽  
Mantle Dynamics ◽  
Plate Motions ◽  
Low Viscosity ◽  
Mantle Viscosity ◽  
Flow Feature ◽  
Mantle Rheology

SUMMARY Previous studies have shown that a low viscosity upper mantle can impact the wavelength of mantle flow and the balance of plate driving to resisting forces. Those studies assumed that mantle viscosity is independent of mantle flow. We explore the potential that mantle flow is not only influenced by viscosity but can also feedback and alter mantle viscosity structure owing to a non-Newtonian upper-mantle rheology. Our results indicate that the average viscosity of the upper mantle, and viscosity variations within it, are affected by the depth to which a non-Newtonian rheology holds. Changes in the wavelength of mantle flow, that occur when upper-mantle viscosity drops below a critical value, alter flow velocities which, in turn, alter mantle viscosity. Those changes also affect flow profiles in the mantle and the degree to which mantle flow drives the motion of a plate analogue above it. Enhanced upper-mantle flow, due to an increasing degree of non-Newtonian behaviour, decreases the ratio of upper- to lower-mantle viscosity. Whole layer mantle convection is maintained but upper- and lower-mantle flow take on different dynamic forms: fast and concentrated upper-mantle flow; slow and diffuse lower-mantle flow. Collectively, mantle viscosity, mantle flow wavelengths, upper- to lower-mantle velocities and the degree to which the mantle can drive plate motions become connected to one another through coupled feedback loops. Under this view of mantle dynamics, depth-variable mantle viscosity is an emergent flow feature that both affects and is affected by the configuration of mantle and plate flow.

Sign in / Sign up

Export Citation Format

Share Document