MORPHOLOGY OF DIAMONDS DISSOLVED IN THE Fe-S MELT AT DIFFERENT SULFUR CONTENTS
https://doi.org/10.32454/0016-7762-2018-4-23-29
Abstract
An experimental study of the process of the dissolution of diamonds in a sulfur-containing iron melt with different contents of sulfur (10, 15, 20, 25, 30 wt. %) at 3,5 GPa and 1400°C has been carried out. The obtained results indicate that under the realized conditions, the plane-faced diamond crystals of octahedral habit are transformed into a curved octahedroid shape with morphological characteristics similar to natural diamonds from kimberlites. It has been concluded that metal- sulphide melts, given their relatively low melting points, could affect the safety of diamonds in the mantle. The presence of sulfur reduces the solubility of carbon and tends to zero in the Fe-S melt compositions close to eutectic (25 and 30 wt. %). That is, the presence of sulfur has a favorable effect on the stability of diamonds.
About the Authors
V. M. SONIN
V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences
Russian Federation
3, Prospekt Akademika Koptyuga, Novosibirsk 630090, Russia
Russian Federation
3, Prospekt Akademika Koptyuga, Novosibirsk 630090, Russia
I. A. GRYAZNOV
Novosibirsk State University
Russian Federation
Russian Federation
1, Pirogova street, Novosibirsk 630090, Russia
E. I. ZHIMULEV
V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences
Russian Federation
3, Prospekt Akademika Koptyuga, Novosibirsk 630090, Russia
Russian Federation
3, Prospekt Akademika Koptyuga, Novosibirsk 630090, Russia
A. I. CHEPUROV
V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences
Russian Federation
3, Prospekt Akademika Koptyuga, Novosibirsk 630090, Russia
Russian Federation
3, Prospekt Akademika Koptyuga, Novosibirsk 630090, Russia
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Review
For citations:
SONIN V.M., GRYAZNOV I.A., ZHIMULEV E.I., CHEPUROV A.I. MORPHOLOGY OF DIAMONDS DISSOLVED IN THE Fe-S MELT AT DIFFERENT SULFUR CONTENTS. Proceedings of higher educational establishments. Geology and Exploration. 2018;(4):23-29. (In Russ.) https://doi.org/10.32454/0016-7762-2018-4-23-29
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