Journal article

Role of temperature-dependent viscosity and surface plates in spherical shell models of mantle convection

SJ Zhong, MT Zuber, L Moresi, M Gurnis

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH | AMER GEOPHYSICAL UNION | Published : 2000

Abstract

Layered viscosity, temperature-dependent viscosity, and surface plates have an important effect on the scale and morphology of structure in spherical models of mantle convection. We find that long-wavelength structures can be produced either by a layered viscosity with a weak upper mantle or temperature-dependent viscosity even in the absence of surface plates, corroborating earlier studies. However, combining the layered viscosity structure with a temperature-dependent viscosity results in structure with significantly shorter wavelengths. Our models show that the scale of convection is mainly controlled by the surface plates, supporting the previous two-dimensional studies. Our models with ..

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University of Melbourne Researchers