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Journal of Petrology | Volume 17 | Number 4 | Pages 499-521 | 1976
© Oxford University Press 1976

research-article

Distribution of the Period Four Transition Elements among Olivine, Calcic Clinopyroxene and Mafic Silicate Liquid: Experimental Results

J. M. DUKE*

Department of Geology, University of Connecticut Storrs, Connecticut, 06268, U.S.A.

Received September 5, 1975; Revised November 26, 1975; ABSTRACT

The distribution of Ti4+, V3+, Cr3+, Mn2+, Fe(total), Co2+ and Ni2+ among synthetic olivine, calcic clinopyroxene and mafic silicate liquid has been studied between 1125 and 1250 °C under anhydrous conditions at 1 bar total pressure. The distribution of iron and magnesium among the three phases was concluded to be independent of temperature and may be described by the two equations

Formula
Titanium and vanadium did not enter olivine in significant amounts. The mean value of the ratio (wt. per cent TiO2 in Cpx)/(wt. per cent TiO2 in L) was 0.29±0.04 for assemblages in which the liquid had both olivine and hypersthene in the norm but the ratio was greater if the liquid was nepheline normative. Vanadium was concentrated in the pyroxene in some experiments and in the liquid in others, but it was not possible to conclude whether the change in distribution behavior was due to varying temperature or changing liquid composition. Equilibrium partitioning of chromium was not achieved but the results indicate that Cr2O3 was most strongly enriched in clinopyroxene and showed a slight preference for olivine over the liquid. The divalent transition elements were each enriched in olivine relative to clinopyroxene and the degree of enrichment increased in the order predicted by crystal field theory. The mean (wt. per cent oxide in 01)/(wt. per cent oxide in Cpx) ratios were 2.0 for MnO, 2.4 for FeO, 3.9 for CoO and 5.6 for NiO. Manganese was enriched in olivine relative to the liquid and in the liquid relative to the clinopyroxene. Cobalt and nickel were more concentrated in the crystalline phases than in the liquid but the degree of enrichment was markedly less in the experiments in which the liquids were more mafic.


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