Cr-rich spinel and garnet in two peridotite xenoliths from the Frank Smith mine, South Africa: significance of Al and Cr distribution between spinel and garnet.

R. A. Exley, J. V. Smith, R. L. Hervig

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Of two peridotite xenoliths one contains very Ti-rich minerals and the other Ti-poor minerals. Various geothermometers indicate approx 1350 K and approx 1100 K, respectively, with the low Al2O3 in the orthopyroxenes of the Ti-poor peridotite giving 39-47 kbar from the Wood-Banno geobarometer. Complex behaviour was found for the Cr/Al distribution in published analyses of garnet and spinel; these phases may coexist over a 30 kbar P interval ranging from approx 16 kbar for low-bulk Cr to approx 40 kbar for high Cr.-R.A.H.

Original languageEnglish (US)
Pages (from-to)129-134
Number of pages6
JournalMineralogical Magazine
Volume45
Issue number337
DOIs
StatePublished - Jan 1 1982
Externally publishedYes

ASJC Scopus subject areas

  • Geochemistry and Petrology

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