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Lower-mantle material properties and convection models of multiscale plumes

By
Ctirad Matyska
Ctirad Matyska
1
Department of Geophysics, Faculty of Mathematics and Physics, Charles University, V Holes ovic kách 2, 180 00 Prague 8, Czech Republic
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David A. Yuen
David A. Yuen
2
Department of Geology and Geophysics and Minnesota Supercomputing Institute, University of Minnesota, 117 Pleasant Street, SE, 599 Walter Library, Minneapolis, Minnesota 55455-0219, USA
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Published:
January 01, 2007

We present the results of numerical mantle convection models demonstrating that dynamical effects induced by variable mantle viscosity, depth-dependent thermal expansivity, radiative thermal conductivity at the base of the mantle, the spinel to perovskite phase change and the perovskite to post-perovskite phase transition in the deep mantle can result in multiscale mantle plumes: stable lower-mantle superplumes are followed by groups of small upper-mantle plumes. Both radiative thermal conductivity at the base of the lower mantle and a strongly decreasing thermal expansivity of perovskite in the lower mantle can help induce partially layered convection with intense shear heating under the transition zone, which creates a low-viscosity zone and allows for the production of secondary mantle plumes emanating from this zone. Large-scale upwellings in the lower mantle, which are induced mainly by both the style of lower-mantle viscosity stratification and decrease of thermal expansivity, control position of central upper-mantle plumes of each group as well as the upper-mantle plume-plume interactions.

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Contents

GSA Special Papers

Plates, Plumes and Planetary Processes

Gillian R. Foulger
Gillian R. Foulger
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Donna M. Jurdy
Donna M. Jurdy
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Geological Society of America
Volume
430
ISBN print:
9780813724300
Publication date:
January 01, 2007

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