Mixing times in the mantle of the early Earth derived from 2-D and 3-D numerical simulations of convection

Details Mixing times in the mantle of the early Earth derived from 2-D and 3-D numerical simulations of convection Mixing times in the mantle of the early Earth derived from 2-D and 3-D numerical simulations of convection

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3323304c&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 23, CiteID L23304

Physics

Geophysics

4

Geochemistry: Mantle Processes (3621), Geodesy And Gravity: Earth'S Interior: Dynamics (1507, 7207, 7208, 8115, 8120), Nonlinear Geophysics: Chaos (7805), Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105), Tectonophysics: Dynamics: Convection Currents, And Mantle Plumes

Scientific paper

The Earth's mantle is chemically heterogeneous at all scales, as shown by elemental and isotopic analysis of oceanic basalts. This heterogeneity is continuously destroyed by convective stirring and slow diffusion. It has been argued that 3-D time-dependent convection is less efficient than 2-D convection, except in the presence of a toroidal component. In this study we question this conclusion with numerical simulations and show that mixing in 3-D time-dependent convection is as efficient as in 2-D, and only depends on convective vigor. We compute mixing times of thermal and chemical heterogeneities in the early Earth of 10 and 100 Myrs respectively.

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