Magma zonation - Effects of chemical buoyancy and diffusion

Details Magma zonation - Effects of chemical buoyancy and diffusion Magma zonation - Effects of chemical buoyancy and diffusion

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16.1387s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, Dec. 1989, p. 1387-1390.

Physics

10

Buoyancy, Digital Simulation, Earth Crust, Magma, Thermal Diffusivity, Geochemistry, Petrology

Scientific paper

Numerical simulations and scale analysis are used to assess the viability of the marginal box-filling mechanism for producing compositional zonation in magma bodies. Scale analysis and two-dimensional numerical experiments both show that box-filling occurs provided a critical ratio of compositional-to-thermal buoyancy is exceeded. This critical ratio depends on the ratio of thermal-to-chemical diffusivity; application of this result to magma bodies suggests that box-filling may occur for components with relatively high-chemical diffusivities such as water. However, box-filling will not produce significant zonation for components with small chemical diffusivities, such as silica, unless diffusive coupling increases silica diffusivity.

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