Remobilization in the cratonic lithosphere recorded in polycrystalline diamond

D. E. Jacob*, K. S. Viljoen, N. Grassineau, E. Jagoutz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

Polycrystalline diamonds (framesites) from the Venetia kimberlite in South Africa contain silicate minerals whose isotopic and trace element characteristics document remobilization of older carbon and silicate components to form the framesites shortly before kimberlite eruption. Chemical variations within the garnets correlate with carbon isotopes in the diamonds, indicating contemporaneous formation. Trace element, radiogenic, and stable isotope variations can be explained by the interaction of eclogites with a carbonatitic melt, derived by remobilization of material that had been stored for a considerable time in the lithosphere. These results indicate more recent formation of diamonds from older materials within the cratonic lithosphere.

Original languageEnglish
Pages (from-to)1182-1185
Number of pages4
JournalScience
Volume289
Issue number5482
DOIs
Publication statusPublished - 18 Aug 2000
Externally publishedYes

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