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Science 20 December 2002:
Vol. 298. no. 5602, pp. 2369 - 2372
DOI: 10.1126/science.1078617
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Reports

Mass-Independent Sulfur of Inclusions in Diamond and Sulfur Recycling on Early Earth

J. Farquhar,1 B. A. Wing,1 K. D. McKeegan,2 J. W. Harris,3 P. Cartigny,4 M. H. Thiemens5

Populations of sulfide inclusions in diamonds from the Orapa kimberlite pipe in the Kaapvaal-Zimbabwe craton, Botswana, preserve mass-independent sulfur isotope fractionations. The data indicate that material was transferred from the atmosphere to the mantle in the Archean. The data also imply that sulfur is not well mixed in the diamond source regions, allowing for reconstruction of the Archean sulfur cycle and possibly offering insight into the nature of mantle convection through time.

1 Earth System Science Interdisciplinary Center and Department of Geology, University of Maryland, College Park, MD 20742, USA.
2 Department of Earth and Space Sciences, University of California, Los Angeles, CA 90095, USA.
3 Division of Earth Sciences, Gregory Building, University of Glasgow, Glasgow, G12 8QQ, UK.
4 Laboratoire de Géochimie des Isotopes Stables, Université Paris VII, Institut de Physique du Globe de Paris, 75252 Paris Cedex 05, France.
5 Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA.

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