Convection and crystallization in magma cooled from above

Details Convection and crystallization in magma cooled from above Convection and crystallization in magma cooled from above

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl.101...78w&link_type=abstract

Earth and Planetary Science Letters, Volume 101, Issue 1, p. 78-89.

Physics

30

Scientific paper

Calculations are presented for the cooling from above of melts in the Di-An system in which the kinetics of crystallization are incorporated and play a dominant role. The results indicate that even with no initial superheat whatsoever, convection plays an important role in the cooling of magma chambers and allows substantial internal cooling, crystallization and differentiation. The calculations show, in agreement with observations, that in magma bodies hundreds of meters thick, crystallization occurs predominantly in the interior or at the floor, even though heat is lost only from the roof. The ratio of the final thickness of the layer formed at the floor to that formed at the roof increases as the overall size of the chamber increases, owing to the effects of convection.

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