Archean emplacement of eclogitic components into the lithospheric mantle during formation of the Kaapvaal craton

Steven B. Shirey*, Richard W. Carlson, Stephen H. Richardson, Andrew Menzies, John J. Gurney, D. Graham Pearson, Jeffrey W. Harris, Uwe Wiechert

*Corresponding author for this work

Research output: Contribution to journalArticle

116 Citations (Scopus)

Abstract

Re-Os data for selected whole-rock eclogites and eclogitic sulfide inclusions in diamonds from seven kimberlites on the Kaapvaal-Zimbabwe cratons yield ages around 3 Ga. The presence of such old eclogitic components in the subcontinental lithospheric mantle is more common than previously thought. Overlap of these ages with those of many cratonic peridotites demonstrates that incorporation of eclogitic materials accompanied or closely followed cratonic lithosphere stabilization. Many of these eclogitic components have fractionated C, N, O, and S isotopic compositions which could have been created at low-temperatures, implying that some style of Archean subduction involving emplacement of oceanic lithosphere was part of craton keel development.

Original languageEnglish
Pages (from-to)2509-2512
Number of pages4
JournalGeophysical Research Letters
Volume28
Issue number13
DOIs
Publication statusPublished - 1 Jul 2001
Externally publishedYes

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