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American Mineralogist; July 2006; v. 91; no. 7; p. 1110-1116; DOI: 10.2138/am.2006.2009
© 2006 Mineralogical Society of America
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Carbonate reduction by Fe-S-O melts at high pressure and high temperature

Sarah C. Gunn and Robert W. Luth*

C.M. Scarfe Laboratory for Experimental Petrology, Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3 Canada

Correspondence: * E-mail: robert.luth{at}ualberta.ca

Diamond may form in the Earth’s mantle by recrystallization of graphite, by precipitation from a C-bearing fluid, or by reduction of carbonate. The latter mechanism could result from interaction with a reduced fluid or another phase that would accommodate the oxygen produced by the reduction. One possible such phase is a sulfide-bearing melt, given that sulfides are common inclusions in diamond. Experiments at 1300 °C, 6 and 7.5 GPa successfully reduced magnesite in the presence of a eutectic-composition Fe-S-O melt. Although graphite rather than diamond was produced by this reduction, these experiments demonstrate that this mechanism is a viable mechanism for reducing carbonate to carbon in the Earth’s mantle.

Key Words: Experimental petrology • high-pressure studies • igneous petrology • crystal synthesis




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Y. N. Palyanov, V. S. Shatsky, N. V. Sobolev, and A. G. Sokol
High-Pressure Geoscience Special Feature: The role of mantle ultrapotassic fluids in diamond formation
PNAS, May 29, 2007; 104(22): 9122 - 9127.
[Abstract] [Full Text] [PDF]


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