Geochemical aspects of permeability controlled partial melting and fractional crystallization

Details Geochemical aspects of permeability controlled partial melting and fractional crystallization Geochemical aspects of permeability controlled partial melting and fractional crystallization

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46...43m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, Issue 1, pp.43-57

Computer Science

13

Scientific paper

Magma accumulation in the mantle requires that the mantle be permeable. Experimental investigations show that the permeability threshold first will be attained after a certain degree of partial melting. The influence of the permeability threshold on the composition of partial melts is evaluated using the fayalite-forsterite system as an example. In addition the variation in trace element concentrations are calculated for different distribution coefficients. Primary magmas formed by accumulation when a minimal degree of partial melting is required for permeability display a remarkably small variation in composition up to 30% partial melting. It is suggested from REE abundances that primary tholeiitic magmas have been generated by permeability controlled partial melting. The compositions of the primary magmas generated by permeability controlled partial melting will not differ much from the compositions obtained by batch melting, but the degrees of partial melting will differ for similar compositions.

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