Isotopic fractionation of oxygen and carbon in decomposed lower-mantle inclusions in diamond

Felix Kaminsky*, Jennifer Matzel, Ben Jacobsen, Ian Hutcheon, Richard Wirth

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Two carbonatitic mineral assemblages, calcite + wollastonite and calcite + monticellite, which are encapsulated in two diamond grains from the Rio Soriso basin in the Juina area, Mato Grosso State, Brazil, were studied utilizing the NanoSIMS technique. The assemblages were formed as the result of the decomposition of the lower-mantle assemblage calcite + CaSi-perovskite + volatile during the course of the diamond ascent under pressure conditions from 15 to less than 0.8 GPa. The oxygen and carbon isotopic compositions of the studied minerals are inhomogeneous. They fractionated during the process of the decomposition of primary minerals to very varying values: δ18O from −3.3 to +15.4 ‰ SMOW and δ13C from −2.8 to +9.3 ‰ VPDB. These values significantly extend the mantle values for these elements in both isotopically-light and isotopically-heavy areas.

Original languageEnglish
Pages (from-to)379-385
Number of pages7
JournalMineralogy and Petrology
Volume110
Issue number2-3
DOIs
Publication statusPublished - 1 Apr 2016
Externally publishedYes

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