Fertile iron-rich dunite xenoliths from the Bultfontein kimberlite, South Africa - relationship to other mantle peridotite xenoliths.

J. B. Dawson, R. L. Hervig, J. V. Smith

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

Dunite blocks consist of olivine with, in some specimens, minor amounts of magnesian ilmenite, bronzite and phlogopite. Averaged analyses (major elements) are given of several olivines and ilmenites. The olivines have lower Mg/(Mg + Fe) ratios (Fo84-90) than other mantle peridotites, suggesting that they cannot be the residue after partial melting of parental lherzolite. The chemistry of the dunite minerals closely resembles that of kimberlite megacrysts and it is suggested that the dunites are cumulates. -A.C.B.

Original languageEnglish (US)
Pages (from-to)303-324
Number of pages22
JournalFortschritte der Mineralogie
Volume59
Issue number2
StatePublished - Jan 1 1981
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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