Eclogitic diamond formation at Jwaneng

No room for a recycled component

Pierre Cartigny*, Jeffrey W. Harris, Marc Javoy

*Corresponding author for this work

Research output: Contribution to journalArticle

138 Citations (Scopus)

Abstract

Eclogitic diamonds have a large range of δ13C values, whereas peridotitic diamonds do not. Paired δ1513C-N variations in 40 eclogitic diamonds from the Jwaneng kimberlite in Botswana show that neither the influence of recycled biogenic carbon nor the global and primordial heterogeneity of mantle carbon are likely for the origin of the large δ13C range; the data instead support a fractionation process. It is proposed that carbonatitic mantle melts from which diamonds crystallize undergo different evolutions before diamond precipitation, when percolating through either a peridotite or an eclogite. These different evolutions, reflecting the presence or absence of olivine, can account for their respective δ13C distributions.

Original languageEnglish
Pages (from-to)1421-1424
Number of pages4
JournalScience
Volume280
Issue number5368
DOIs
Publication statusPublished - 29 May 1998
Externally publishedYes

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