The effect of shearing on the onset and vigor of small-scale convection in a Newtonian rheology

Details The effect of shearing on the onset and vigor of small-scale convection in a Newtonian rheology The effect of shearing on the onset and vigor of small-scale convection in a Newtonian rheology

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30ssde6v&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 19, pp. SDE 6-1, CiteID 1991, DOI 10.1029/2003GL018101

Physics

6

Tectonophysics: Dynamics Of Lithosphere And Mantle-General, Tectonophysics: Dynamics, Convection Currents And Mantle Plumes, Tectonophysics: Plate Motions-General

Scientific paper

As an oceanic plate cools with time, the bottom part of the plate may undergo gravitational instabilities and lead to sub-lithospheric small-scale convection (SSC). While numerous previous studies have examined the dynamics of SSC below a fixed top boundary, in this study we investigate the effects of shearing due to plate motion on the onset and time evolution of SSC with 2-D and 3-D finite element models with a prescribed surface plate motion and a Newtonian rheology. Our 3-D models show that plate motion moderately enhances the SSC that displays plate-motion-parallel convective roll-structures. However, plate motion significantly hinders SSC in 2-D models with plate motion that produces plate-motion-perpendicular convective roll-structures. In spite of moderate influences of plate motion on the dynamics of SSC, our results suggest that for Newtonian rheology the onset time of SSC predicted from previous studies with a fixed top boundary is to the first order valid.

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