Инд. авторы:	Palyanov Y.N., Sokol A.G., Khokhryakov A.F., Kruk A.N.
Заглавие:	Conditions of diamond crystallization in kimberlite melt: experimental data
Библ. ссылка:	Palyanov Y.N., Sokol A.G., Khokhryakov A.F., Kruk A.N. Conditions of diamond crystallization in kimberlite melt: experimental data // Russian Geology and Geophysics. - 2015. - Vol.56. - Iss. 1-2. - P.196-210. - ISSN 1068-7971. - EISSN 1878-030X.
Внешние системы:	DOI: 10.1016/j.rgg.2015.01.013; РИНЦ: 24019244; SCOPUS: 2-s2.0-84925342542; WoS: 000351312200013;
Реферат:	eng: Experiments on diamond crystallization in kimberlite melt were performed for 40 h at 6.3 GPa in the temperature range of 1300-1570 degrees C and at 7.5 GPa in the temperature range of 1450-1570 degrees C, using a multianvil high-pressure apparatus of split-sphere type. Group I kimberlite from the Udachnaya-East pipe and a synthetic multicomponent mixture modeling the average composition of group II kimberlites were used as starting materials. The experiments have shown that diamond growth on seed crystals in the kimberlite melt in equilibrium with olivine, pyroxene, and garnet starts from 1400 degrees C at 7.5 GPa and from 1520 degrees C at 6.3 GPa. Diamond nucleation requires higher temperature and pressure, 1570 degrees C and 7.5 GPa. The alkali-enriched and silicate-depleted derivates of kimberlite melts ensure the growth and nucleation of diamond at lower P and T values: 1400 degrees C at 7.5 GPa and 1520 degrees C at 6.3 GPa. The results obtained evidence that temperature, pressure, and the composition of crystallization medium are the main factors controlling diamond formation processes in the kimberlite melts and their derivates. (C) 2015, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.
Ключевые слова:	kimberlite melt; HP-HT experiment; CARBONATE-SILICATE SYSTEMS; MAGMA GENERATION; FIBROUS DIAMONDS; CRATONIC LITHOSPHERE; UDACHNAYA KIMBERLITE; EXPERIMENTAL CONSTRAINTS; PIPE YAKUTIA; P-T CONDITIONS; GROUP-II KIMBERLITES; diamond formation; HIGH-PRESSURE SYNTHESIS;
Издано:	2015
Физ. характеристика:	с.196-210