Archean subduction recorded by Re-Os isotopes in eclogitic sulfide inclusions in Kimberley diamonds

S. H. Richardson*, S. B. Shirey, J. W. Harris, R. W. Carlson

*Corresponding author for this work

Research output: Contribution to journalArticle

148 Citations (Scopus)

Abstract

Eclogitic sulfide minerals encapsulated in diamonds originating from the deepest part of the continental mantle keel beneath the Kaapvaal craton, southern Africa, and brought to the surface by the Kimberley kimberlites, show low Ni and Os contents and high Re/Os ratios characteristic of a basaltic protolith. The sulfide inclusions with the lowest Os contents give late Archean single grain absolute ages while those with higher Os contents yield a well-constrained 2.9 Ga isochron age and radiogenic initial Os isotope composition (γOs = +45). This indicates a significant time gap between basaltic precursor generation and eclogitic diamond crystallization, consistent with extended residence in a near-surface environment prior to subduction associated with accretion of the Kimberley block to the rest of the craton and subsequent diamond formation. These results suggest that subduction-related crustal recycling was already a viable process during continent formation in the middle Archean and may have been implicated in eclogitic diamond formation ever since.

Original languageEnglish
Pages (from-to)257-266
Number of pages10
JournalEarth and Planetary Science Letters
Volume191
Issue number3-4
DOIs
Publication statusPublished - 2001
Externally publishedYes

Keywords

  • Diamond
  • Eclogite
  • Isotope ratios
  • Kimberlite
  • Re/Os
  • Subduction
  • Sulfides

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