Computer Science
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..75..147k&link_type=abstract
Earth and Planetary Science Letters, Volume 75, Issue 2-3, p. 147-156.
Computer Science
12
Scientific paper
We describe experiments on buoyancy-driven exchange between fluid in a porous bed of glass balls and an overlying reservoir of denser fluid. ``Fingers'' of the dense fluid penetrated downwards into the porous medium. When the two fluids had equal viscosities, the rate of convective exchange was proportional to permeability and the density difference between the fluids, and was inversely proportional to viscosity. When the fluids had different viscosities, the rate further depended on the viscosity ratio raised to the power 0.4. If a layer of dense new melt is emplaced above a porous cumulus pile forming the floor of a magma chamber an analogous process may occur, as the new melt can percolate down into the pore space and expel the less dense intercumulus liquid. Convective exchange may proceed at rates of metres per year to tens of metres per year in basic to ultrabasic magmatic systems. This conclusion strongly depends on the porosity of the cumulus pile and is less sensitive to the magmatic viscosities. Chemical and textural effects will result from this process, such as re-equilibration and resorption of cumulus crystals. When intercumulus melt exchange is incomplete, lateral geochemical gradients may be preserved in cumulate rocks.
Present address: Institut für Mineralogie, Ruhr Universität Bochum, Postfach 102148, 4630-Bochum, F.R.G. (address for reprint requests).
Kerr Ross C.
Tait Stephen R.
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