Olivine fractionation equations for basaltic and ultrabasic liquids

Details Olivine fractionation equations for basaltic and ultrabasic liquids Olivine fractionation equations for basaltic and ultrabasic liquids

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.276..771p&link_type=abstract

Nature, Volume 276, Issue 5690, pp. 771-774 (1978).

Physics

11

Scientific paper

Exact equations are derived for fractionation curves of basaltic and ultrabasic liquids. The ideal fractionation equation has the form y = axK while equilibrium crystallisation has the form (1/y) = Km1(1/x) + b1 . (1 - K), and batch fractionation, y = Km2 + b2 . (1 - K). A ratio transformation as in Pearce diagrams allows natural data to be analysed to determine if a constant distribution coefficient fits the data: K may also be determined directly. Published data for a series of liquids fractionated from a lunar picrite parent have been analysed using the equilibrium equation. The average K value is K = 0.323 with a linear correlation coefficient, R = 0.996. The reported olivine analyses yield a K = 0.321 for the same set of experiments. Using the ideal fractionation equation, the liquid line of descent can be calculated and constraints placed on the primitive liquids which produced a given mafic rock by olivine fractionation.

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