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Mantle plumes - A boundary layer approach for Newtonian and non-Newtonian temperature-dependent rheologiesStress is placed on the temperature dependence of both a linear Newtonian rheology and a nonlinear olivine rheology in accounting for narrow mantle flow structures. The boundary-layer theory developed incorporates an arbitrary temperature-dependent power-law rheology for the medium, in order to facilitate the study of mantle plume dynamics under real conditions. Thermal, kinematic, and dynamic structures of mantle plumes are modelled by a two-dimensional natural-convection boundary layer rising in a fluid with a temperature-dependent power-law relationship between shear stress and strain rate. An analytic similarity solution is arrived at for upwelling adjacent to a vertical isothermal stress-free plane. Newtonian creep as a deformation mechanism, thermal anomalies resulting from chemical heterogeneity, the behavior of plumes in non-Newtonian (olivine) mantles, and differences in the dynamics of wet and dry olivine are discussed.
Document ID
19760050607
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Yuen, D. A.
(California Univ. Los Angeles, CA, United States)
Schubert, G.
(California, University Los Angeles, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
May 10, 1976
Publication Information
Publication: Journal of Geophysical Research
Volume: 81
Subject Category
Geophysics
Accession Number
76A33573
Funding Number(s)
CONTRACT_GRANT: NGL-05-007-002
CONTRACT_GRANT: NSF GA-40749
Distribution Limits
Public
Copyright
Other

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