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European Journal of Mineralogy; June 2008; v. 20; no. 3; p. 349-355; DOI: 10.1127/0935-1221/2008/0020-1819
© 2008 E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
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Right arrow Articles by Shushkanova, A. V.
Right arrow Articles by Litvin, Y. A.

Diamonds: A Special Issue in honour of Vladimir S. Sobolev

Diamond nucleation and growth in sulfide-carbon melts: an experimental study at 6.0–7.1 GPa

Anastasia V. Shushkanova1,2,* and Yuriy A. Litvin1

1 Institute of Experimental Mineralogy RAS, 4, Institutskaya Street, Chernogolovka, Moscow District, 142432, Russia
2 M.V. Lomonosov Moscow State University, Geological Department, Vorob’yovy Gory, Moscow, 119899, Russia

* Corresponding author, e-mail: shushkanova{at}iem.ac.ru

Experimental study of diamond nucleation and growth in pyrrhotite-carbon melts was carried out at 6.0–7.1 GPa. The PT -diagram of diamond crystallization was constructed, and we found that the PT boundary conditions of diamond formation are limited by the diamond-graphite equilibrium line and the PT curve of the pyrrhotite-carbon eutectics. The fields of diamond spontaneous nucleation and mass crystallization as well as of diamond-seeded growth were determined. Diamond nucleation density up to 1.8 x 105 grains in 1 mm3 and growth rate within the range of several mm/min to several µm/min were estimated. A possibility for formation of both monocrystalline and polycrystalline diamonds in the molten sulfide solvents was also demonstrated. Experimental data are in agreement with the melt-solution model of diamond formation in sulfide solvents of carbon. The experimental and literature data applied to the model of the mantle-derived diamond genesis demonstrate that sulfide melts with dissolved carbon are capable to form a limited mass of diamonds with specific mineralogical and physical properties.

Key-words: diamond growth, nucleation, sulfide solvent, high-pressure experiment, boundary conditions, diamond genesis.






JOURNAL HOME HELP FEEDBACK/COMMNET SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2008 by E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers