Primary carbonatite melt from deeply subducted oceanic crust

M. J. Walter (), G. P. Bulanova, L. S. Armstrong, S. Keshav, J. D. Blundy, G. Gudfinnsson, O. T. Lord, A. R. Lennie, S. M. Clark, C. B. Smith and L. Gobbo
Additional contact information
M. J. Walter: University of Bristol, Queen’s Road, Bristol BS8 1RJ, UK
G. P. Bulanova: University of Bristol, Queen’s Road, Bristol BS8 1RJ, UK
L. S. Armstrong: University of Bristol, Queen’s Road, Bristol BS8 1RJ, UK
S. Keshav: Bayerisches Geoinstitut, Universität Bayreuth
J. D. Blundy: University of Bristol, Queen’s Road, Bristol BS8 1RJ, UK
G. Gudfinnsson: Bayerisches Geoinstitut, Universität Bayreuth
O. T. Lord: University of Bristol, Queen’s Road, Bristol BS8 1RJ, UK
A. R. Lennie: Daresbury Laboratory, Keckwick Lane, Warrington WA4 4AD, UK
S. M. Clark: Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
C. B. Smith: Rio Tinto Mining and Exploration Ltd., Paddington, London W2 6LG, UK
L. Gobbo: Rio Tinto Desinvolvimentos Minerais Ltda, SIA Trecho 2, Lote 720, Brasilia, DF 71.200-020, Brazil

Nature, 2008, vol. 454, issue 7204, 622-625

Abstract: The Earth's mantle: message in a diamond The geochemical and isotopic diversity observed in volcanic rocks at the Earth's surface is due in large part to partial melting in the Earth's mantle. Mineral inclusions in natural diamonds can provide a window into such deep mantle processes. Walter et al. provide experimental and geochemical observations showing that silicate mineral inclusions in diamonds from Juina, Brazil, crystallized from primary and evolved carbonatite melts in the mantle transition zone and deep upper mantle. Such small-degree melts of subducted crust can be viewed as agents of chemical mass-transfer in the upper mantle and transition zone, leaving a chemical imprint of ocean crust that can possibly endure for billions of years.

Date: 2008
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DOI: 10.1038/nature07132

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