High-pressure, synthetic loveringite-davidite and its rare earth element geochemistry

T. H. Green, N. J. Pearson

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Loveringite-davidite members of the crichtonite group were synthesized at 7.5 kbar, 1000-1050oC, from a melt of TiO2 and REE-enriched basaltic andesite composition. Four sets of partition coefficients were obtained for La, Sm, Ho, Lu and Sr (analogue for Eu2+); these show that light and heavy REE are readily accommodated, but that the intermediate REE are discriminated against in this structure. This confirms the proposed substitution of the REE in the two sites (A and M) in the minerals of the crichtonite group (AM21O38). These minerals are stable to 20 kbar, 1300oC and 30 kbar, 1000oC, indicating that this phase may be an important accessory repository for both light and heavy REE in the upper mantle.-R.A.H.

Original languageEnglish
Pages (from-to)145-149
Number of pages5
JournalMineralogical Magazine
Volume51
Issue number1
Publication statusPublished - 1987

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