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Science 29 May 1998:
Vol. 280. no. 5368, pp. 1421 - 1424
DOI: 10.1126/science.280.5368.1421
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Reports

Eclogitic Diamond Formation at Jwaneng: No Room for a Recycled Component

Pierre Cartigny, * Jeffrey W. Harris, Marc Javoy

Eclogitic diamonds have a large range of delta 13C values, whereas peridotitic diamonds do not. Paired delta 15N-delta 13C-N variations in 40 eclogitic diamonds from the Jwaneng kimberlite in Botswana show that neither the influence of recycled biogenic carbon nor the global and primordial heterogeneity of mantle carbon are likely for the origin of the large delta 13C range; the data instead support a fractionation process. It is proposed that carbonatitic mantle melts from which diamonds crystallize undergo different evolutions before diamond precipitation, when percolating through either a peridotite or an eclogite. These different evolutions, reflecting the presence or absence of olivine, can account for their respective delta 13C distributions.

P. Cartigny and M. Javoy, Laboratoire de Géochimie des Isotopes Stables, Université de Paris VII, Institut de Physique du Globe de Paris (IPGP), 4 Place Jussieu, 75251 Paris Cedex 05, France.
J. W. Harris, Department of Geology and Applied Geology, University of Glasgow, Glasgow G12 8QQ, Scotland, UK.
*   To whom correspondence should be addressed. E-mail: cartigny{at}ipgp.jussieu.fr

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