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The systems KCl–CaCO3 and KCl–MgCO3 at 6 GPa.
- Source :
-
High Pressure Research . Sep2022, Vol. 42 Issue 3, p245-258. 14p. - Publication Year :
- 2022
-
Abstract
- Continuous variations in the composition of melt inclusions in diamonds from K-rich saline to carbonatitic indicate their possible genetic relationship. This causes interest in the study of chloride-carbonate systems at high pressure. Here we present experimental data on phase relations in the KCl–CaCO3 and KCl–MgCO3 systems at 6 GPa and 1000–1600 °C. The studied systems have the eutectic type of T-X diagrams. Subsolidus phases are represented by aragonite + KCl and magnesite + KCl. The KCl–CaCO3 eutectic is situated at 1200 °C and K2# 20, while the KCl–MgCO3 eutectic is located at 1400 °C and K2# 43, where K2# = 2KCl/(2KCl + CaCO3 + MgCO3)×100 mol%. The concentration of K and Cl in water-soluble chloride, and Ca, Mg, and CO2 in carbonate suggests that K-rich saline fluid entrapped by 'fibrous' diamonds could be a low-temperature derivative of a carbonatite melt containing KCl and H2O. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 08957959
- Volume :
- 42
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- High Pressure Research
- Publication Type :
- Academic Journal
- Accession number :
- 159448490
- Full Text :
- https://doi.org/10.1080/08957959.2022.2102426