Some trace element relationships among liquid and solid phases in the course of the fractional crystallization of magmas

Details Some trace element relationships among liquid and solid phases in the course of the fractional crystallization of magmas Some trace element relationships among liquid and solid phases in the course of the fractional crystallization of magmas

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40..667a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 40, Issue 6, pp.667-673

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Scientific paper

The classical equations relating the trace element concentrations of the liquid and solid phases coexisting in the simple fractional crystallization of a parental magma have been put in a simple graphical form, which allows rapid analysis of the possible genetic relationships in a given rock suite. The effects of an incomplete separation between the two phases are taken into account. The approach does not require the use of otherwise estimated partition coefficients. Trace element data concerning the minerals of cumulates, where available, may provide an independent estimation of the effective mineral-liquid partition coefficients. With reasonable assumptions, this approach may even be applied to plutonic rocks. Interpretation of the published rare earth element data from the Southern California Batholith by this procedure suggests that a tonalitic parental magma could generate a granodioritic liquid by crystallizing 40-50 wt % of a solid residue of gabbroic composition, in agreement with ( Mem. Geol. Soc. Amer . 29 , 1948) calculations. The calculated mineral-liquid partition coefficients for the REE fall in the range of published phenocryst-groundmass values for acidic volcanic rocks.

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