Инд. авторы:	Bataleva Y.V., Kruk A.N., Novoselov I.D, Furman O.V., Palyanov Y.N.
Заглавие:	Decarbonation Reactions Involving Ankerite and Dolomite under upper Mantle P,T-Parameters: Experimental Modeling
Библ. ссылка:	Bataleva Y.V., Kruk A.N., Novoselov I.D, Furman O.V., Palyanov Y.N. Decarbonation Reactions Involving Ankerite and Dolomite under upper Mantle P,T-Parameters: Experimental Modeling // MINERALS. - 2020. - Vol.10. - Iss. 8. - Art.715.
Внешние системы:	DOI: 10.3390/min10080715; РИНЦ: 45371014; РИНЦ: 45371014; WoS: 000564840300001;
Реферат:	eng: An experimental study aimed at the modeling of dolomite- and ankerite-involving decarbonation reactions, resulting in the CO2 fluid release and crystallization of Ca, Mg, Fe garnets, was carried out at a wide range of pressures and temperatures of the upper mantle. Experiments were performed using a multi-anvil high-pressure apparatus of a "split-sphere" type, in CaMg(CO3)(2)-Al2O3-SiO2 and Ca(Mg,Fe)(CO3)(2)-Al2O3-SiO2 systems (pressures of 3.0, 6.3 and 7.5 GPa, temperature range of 950-1550 degrees C, hematite buffered high-pressure cell). It was experimentally shown that decarbonation in the dolomite-bearing system occurred at 1100 +/- 20 degrees C (3.0 GPa), 1320 +/- 20 degrees C (6.3 GPa), and 1450 +/- 20 degrees C (7.5 GPa). As demonstrated by mass spectrometry, the fluid composition was pure CO2. Composition of synthesized garnet was Prp(83)Grs(17), with main Raman spectroscopic modes at 368-369, 559-562, and 912-920 cm(-1). Decarbonation reactions in the ankerite-bearing system were realized at 1000 +/- 20 degrees C (3.0 GPa), 1250 +/- 20 degrees C (6.3 GPa), and 1400 +/- 20 degrees C (7.5 GPa). As a result, the garnet of Grs(25)Alm(40)Prp(35) composition with main Raman peaks at 349-350, 552, and 906-907 cm(-1) was crystallized. It has been experimentally shown that, in the Earth's mantle, dolomite and ankerite enter decarbonation reactions to form Ca, Mg, Fe garnet + CO2 assemblage at temperatures similar to 175-500 degrees C lower than CaCO3 does at constant pressures.
Ключевые слова:	SYSTEM; CARBONATE; TRANSITION ZONE; KIMBERLITE PIPE; SIDERITE STABILITY; MINERAL INCLUSIONS; PHASE-RELATIONS; HIGH-PRESSURE; high-pressure experiment; experimental modeling; CO2 fluid; garnet; ankerite; dolomite; decarbonation reaction; DIAMOND FORMATION; MELTS;
Издано:	2020
Физ. характеристика:	715
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