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European Journal of Mineralogy; March, April 2000; v. 12; no. 2; p. 367-375; DOI: 10.1127/0935-1221/2000/0001-0367
© 2000 E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
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Articles

Fluid regime of diamond crystallisation in carbonate-carbon systems

Aglexander G. SOKOL*, Anatoly A. TOMILENKO, Yury N. PAL'YANOV, Yury M. BORZDOV, Galina A. PAL'YANOVA and Alexander F. KHOKHRYAKOV

Institute of Mineralogy and Petrography, Russian Academy of Sciences, Koptyuga pr., 3, Novosibirsk, 630090, Russia

* E-mail: Palyanov{at}uiggm.nsc.ru

The gaseous phase in experiments of diamond crystallisation in the carbonate-carbon systems Li2CO3-C, Na2CO3-C, K2CO3-C, CS2CO3-C, CaCO3-C, CaMg(CO3)2-C at P = 7 GPa and T =1 700–1750°C (using the "split-sphere" high-pressure device) was studied by means of gas chromatography. Unlike in traditional metal-carbon systems, in which diamond forms under highly reducing conditions in the presence of a methane-hydrogen fluid, crystallisation of diamond in carbonate-carbon systems occurs in the presence of a H2O-CO2-rich fluid. The results provide experimental confirmation of the possibility for diamond to crystallise in nature in a wide range of redox conditions.

Key-words: diamond crystallisation, carbonate, fluid regime, HP/HT experiments.




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