Abstract
A FORTRAN 77 program is presented which computes the melting parameters of felsic rocks for phase diagrams involving quartz (Q), albite (Ab), anorthite (An), and orthoclase (Or) components. The resolution requires a geometrical expression of mass balance equations in the (Q-Ab-An-Or) tetrahedron where experimental cotectic surfaces are modeled as a set of linked triangular facets. Liquid and residue paths, corresponding to a progressive melting of any felsic composition, can be followed step-by-step and liquid fractions calculated as a function of temperature.The fusion in a layered metamorphic series, creating a stromatic migmatite, is given as an application of this program. Curves giving the liquid fraction vs temperature are obtained and compared for granitic and gneissic layers of the same outcrop. The modeling shows that differential melting between layers of this migmatite is controlled mainly by compositional heterogeneities in the initial metamorphic pile.
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