Инд. авторы:	Reutsky V., Borzdov Y., Palyanov Y., Sokol A., Izokh O.
Заглавие:	Carbon isotope fractionation during experimental crystallisation of diamond from carbonate fluid at mantle conditions
Библ. ссылка:	Reutsky V., Borzdov Y., Palyanov Y., Sokol A., Izokh O. Carbon isotope fractionation during experimental crystallisation of diamond from carbonate fluid at mantle conditions // Contributions to Mineralogy and Petrology. - 2015. - Vol.170. - Iss. 5-6. - Art.41. - ISSN 0010-7999. - EISSN 1432-0967.
Внешние системы:	DOI: 10.1007/s00410-015-1197-5; РИНЦ: 24967433; SCOPUS: 2-s2.0-84945340408; WoS: 000366805800001;
Реферат:	eng: We report first results of a systematic study of carbon isotope fractionation in a carbonate fluid system under mantle PT conditions. The system models a diamond-forming alkaline carbonate fluid using pure sodium oxalate (Na2C2O4) as the starting material, which decomposes to carbonate, CO2 and elementary carbon (graphite and diamond) involving a single source of carbon following the reaction 2Na2C2O4 → 2Na2CO3 + CO2 + C. Near-liquidus behaviour of carbonate was observed at 1300 °C and 6.3 GPa. The experimentally determined isotope fractionation between the components of the system in the temperature range from 1300 to 1700 °C at 6.3 and 7.5 GPa fit the theoretical expectations well. Carbon isotope fractionation associated with diamond crystallisation from the carbonate fluid at 7.5 GPa decreases with an increase in temperature from 2.7 to 1.6 ‰. This trend corresponds to the function ΔCarbonate fluid–Diamond = 7.38 × 106 T−2. © 2015, Springer-Verlag Berlin Heidelberg.
Ключевые слова:	isotopic fractionation; high temperature; high pressure; experimental study; diamond; crystallization; carbonate; P-T conditions; Mantle conditions; HPHT experiment; Fractionation; Diamond; Carbonate fluid; Carbon isotopes; carbon isotope; mantle structure;
Издано:	2015
Физ. характеристика:	41