Mixing of passive heterogeneities by mantle convection

Details Mixing of passive heterogeneities by mantle convection Mixing of passive heterogeneities by mantle convection

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89..425o&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Jan. 10, 1984, p. 425-436. Research supported by the Petroleum Resear

Physics

71

Convective Flow, Earth Mantle, Geophysical Fluids, Benard Cells, Flow Visualization, Free Convection, Laminar Flow, Laminar Mixing, Scalars, Turbulent Flow, Turbulent Mixing

Scientific paper

A theory which describes how creeping flow in the earth's mantle redistributes large-scale passive anomalies of bulk and trace element composition as well as temperature is presented. Theoretical predictions of mixing time scales are compared directly with results of numerical experiments on mixing within Benard convection cells. Through this comparison, it is shown that mixing by creeping flow can be described as a cascade process. Individual Fourier components of an anomaly are transferred from low to high wave number, the rate of transfer being proportional to the mean Lagrangian strain rate. Regardless of their initial shape, passive mantle heterogeneities tend to become laminated, particularly in the uppermost part of the mantle, where the transport direction is predominantly horizontal.

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