Computer Science
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.2517c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 50, Issue 11, pp.2517-2522
Computer Science
6
Scientific paper
Trace element modelling has been widely used for petrogenetic interpretation of basaltic systems. This paper indicates how to select trace element pairs having very different bulk distribution coefficients ( D ) which when plotted on simple log-log diagrams permit the identification of the main magmatic process (magma mixing, partial melting, fractional crystallization) involved in the genesis of plutonic rocks. Fractional crystallization gives a straight line on such a diagram with a strong decrease of the compatible element whereas the concentrations of the element with D << 1 increase slowly. A similar evolution of the solids in equilibrium is observed and when data of at least one of the cumulates are directly available, it is possible to calculate the D and F parameters of the sequence of fractional crystallization. An example of this procedure is shown for a French Hercynian plutonic suite: the basic suite of Variscan Corsica.
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