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 language||English (US)|
|Number of pages||22|
|Journal||Fortschritte der Mineralogie|
|State||Published - Jan 1 1981|
ASJC Scopus subject areas
- Environmental Science(all)
- Earth and Planetary Sciences(all)