Abstract
Two major mineral inclusion parageneses in diamonds have been recognized worldwide, i.e. diamonds with eclogitic (E-Type) and peridotitic (P-Type) inclusions. In addition minor parageneses known as websteritic (W-Type) and lherzolitic (L-Type) have been observed. Furthermore, Meyer (1987) has proposed that the existence of a separate sulphide paragenesis (S-Type) should be recognized. While the relationships between silicate inclusion chemistry and carbon isotopic composition have been examined in some detail for south African diamonds, similar studies for diamonds with sulphide inclusions have been lacking. The present work provides the first systematic investigation of the carbon isotope geochemistry and sulphide inclusion chemistry of south African diamonds. Sample suites from Koffiefontein, Orapa, Premier Mine, Roberts Victor, Jagersfontein, Sierra Leone, Star Mine, Mwadui and Alamasi were analyzed. The data are used to examine the role of fluids in diamond formation.
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