Peridotite nodules from the Ngopetsoeu and Lipelaneng kimberlites, Lesotho

a crustal or mantle origin.

D. A. Carswell, W. L. Griffin, P. Kresten

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Variations in whole-rock and mineral chemistries allow the recognition of four distinct groups of peridotite nodules within these kimberlite occurrences. Equilibration T estimates, together with general geochemical considerations, strongly suggest that the relatively ferriferous Group 1 (Cr-spinel wehrlites and lherzolites) and Group 2 (Al-spinel lherzolites) nodules represent basaltic cumulates of probable lower crustal origin. By contrast, the more magnesian peridotites are considered to have derived from the upper mantle, with the Group 3 nodules (Cr-spinel lherzolites and harzburgites) originating from shallower levels than those of Group 4 (garnet harzburgites).-J.M.H.

Original languageEnglish
Pages (from-to)229-243
Number of pages15
JournalUnknown Journal
Publication statusPublished - 1984
Externally publishedYes

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