Trace element partitioning between silicate minerals and carbonatite at 25 kbar and application to mantle metasomatism

T. H. Green*, J. Adam, S. H. Siel

*Corresponding author for this work

Research output: Contribution to journalArticle

86 Citations (Scopus)

Abstract

Experiments at 25 kbar and 1000°C, on a model trace element-enriched carbonatite-eridotite mix, produced augite + pargasite ± garnet ± dolomite coexisting with a carbonatite melt. Proton microprobe analysis of the phases showed that key trace elements (Rb, Ba, Sr, Nb, Ta, Zr, Y and REE) all partitioned strongly into the melt (with the exception of Y, Ho and Lu in garnet), verifying that carbonatite is potentially a highly effective metasomatizing agent. The data also indicate that carbonatitic metasomatism will impart higher Ba/Rb, Ba/Nb, Nb/Ta, Sr/Ta, La/Ta, and lower Zr/Y, with little change to Sr/Nb, in affected mantle.

Original languageEnglish
Pages (from-to)179-184
Number of pages6
JournalMineralogy and Petrology
Volume46
Issue number3
DOIs
Publication statusPublished - Sep 1992

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