Abstract
Six rocks and twelve mineral separates from the layered series of the Skaergaard intrusion were analyzed by neutron activation for REE, Ag, As, Ba, Co, Cr, Cu, Ga, Mn, Ni, Sb, Sc and Zn. The logarithmic model for trace element partitioning was further developed for use in describing the behavior of the elements during solidification of the layered series. Iterations were made in order to optimize within limits of uncertainty of measured values, such parameters as bulk composition, zone size, relative proportions of cumulus plus adcumulus minerals, zone mineralogy, and distribution coefficients. Values for distribution coefficients for the elements entering the cumulus minerals were obtained and have uncertainties of ~±50 per cent. The relative size of the hidden zone is limited, according to the estimates from the model, to between 20 and 50 per cent of the mass of the layered series.
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