Experimentally determined partitioning of high field strength- and selected transition elements between spinel and basaltic melt

Ingo Horn*, Stephen F. Foley, Simon E. Jackson, George A. Jenner

*Corresponding author for this work

Research output: Contribution to journalArticle

144 Citations (Scopus)

Abstract

Partition coefficients for the elements Ta, Nb, Hf, Zr, Sc, V, Ga, Zn and Co have been determined by laser ablation ICP-MS and/or electron microprobe between spinel and melt using an alkali olivine basalt at 1 atm. The D sp lq for high field strength elements (HFSE) are uniform (D sp lq Nb = 0.08, D sp lq Ta = 0.06, D sp lq Hf = 0.05, D sp lq Zr = 0.06), negating the possibility of intra-HFSE fractionation during partial melting or fractional crystallization processes. Results for D sp lq V continue an approximately linear trend of decreasing D sp lq V with increasing fO2 from D sp lq V = 68 at IW from previous studies to values of D sp lq V = 0.09 at fO2 = air. D sp lq Sc is also fO2 dependent (0.24-0.56 with increasing fO2), whereas D sp lq Ga is constant at 3.2. A compositional dependence of partitioning behaviour was found for the Ti-poor solid-solution series between chromite-and magnetite-rich spinels in the log fO2 range from air to FMQ - 1 for Co, Zn and Sc. Zn and Co showed deviation from Henry's law behaviour. An approximate value for D sp lq Zn of 4.5 agrees well with the observed partitioning in natural peridotites, but is much larger at lower temperatures. Cobalt partitioning shows a strong negative correlation with temperature and is complicated by fO2 effects.

Original languageEnglish
Pages (from-to)193-218
Number of pages26
JournalChemical Geology
Volume117
Issue number1-4
DOIs
Publication statusPublished - 1 Nov 1994
Externally publishedYes

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