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- Title
Thermochemical Study of Sodium and Sodium–Calcium Amphibols.
- Authors
Ogorodova, L. P.; Kiseleva, I. A.; Vigasina, M. F.; Gritsenko, Yu. D.; Bryzgalov, I. A.; Melchakova, L. V.
- Abstract
A thermochemical study of six natural sodium and sodium-calcium amphiboles was carried out using high-temperature melt solution calorimetry in a Tian–Calvet microcalorimeter. The enthalpies of formation from elements have been obtained for three arfvedsonite samples K0.5(Na1.5Ca0.5)(Mg4.0 Al0.1)[Si8.0O22](OH)2 from the Inagli Massif, central Aldan Shield, Russia (–11626.6 ± 8.9 kJ/mol), (Na0.5K0.1)(Na1.6Ca0.4)(Mg3.6 Al0.2)[Si8.0O22](OH)2 from the Khibiny Massif, Kola Peninsula, Russia (–11520.8 ± 14.6 kJ/mol), and (Na0.7K0.3)Na2.0( Mn0.1Ti0.1Al0.2)[Si8.0O22](OH)2 from the Katuginskoe deposit, Transbaikalia, Russia (–11384.7 ± 17.1 kJ/mol); for two riebeckite samples Na2.0(Mg2.5 Al0.5)Si8O22(OH)2 from the Kumula deposit, Central Kazakhstan (–10791.0 ± 10.1 kJ/mol) and Na2.0(Mg0.9 Al0.1)[Si8O22](OH)2 from Krivoy Rog, Ukraine (–10260.8 ± 10.9 kJ/mol), and for one richterite sample (Na0.7K0.3)(Ca1.2Na0.8)(Mg4.6 )[Si7.8Al0.2O22](OH)2 from the Kovdor Massif, Kola Peninsula, Russia (–12154.2 ± 9.7 kJ/mol). The values of the standard entropies, enthalpies, and Gibbs energies of formation are estimated for the end members of the isomorphic series arfvedsonite–magnesioarfvedsonite, riebeckite–magnesioriebeckite, and richterite–ferrorichterite.
- Subjects
RUSSIA; KOLA Peninsula (Russia); SODIUM compounds; MONEY; AMPHIBOLES; CALORIMETRY; PENINSULAS
- Publication
Geochemistry International, 2019, Vol 57, Issue 5, p556
- ISSN
0016-7029
- Publication type
Article
- DOI
10.1134/S0016702919050082