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Estimation of Chlorine Fugacity in Low-Н2О Fluid of the C–O–(H)–NaCl System in the Cumulus of Ultramafic–Mafic Intrusions.
- Source :
-
Doklady Earth Sciences . Mar2024, Vol. 515 Issue 1, p423-429. 7p. - Publication Year :
- 2024
-
Abstract
- At high PT parameters of cumulates of ultramafic–mafic intrusions and low oxygen fugacity (below QFM buffer), Pt in the form of a carbonyl complex is dissolved in a CO2-bearing fluid. The high solubility of Pt chloride in brines with NaCl, which is related to the formation of low-sulfide deposits of platinum group elements, is attained only at high oxygen fugacity (above the QFM buffer). It is suggested that native platinum at low oxygen fugacity in low-Н2О СО–СО2 (Н2О) fluid can also transit into a cation-soluble form due to the reaction of chloration. The experimental data are provided for the interaction of NaCl with magnetite and chromite (accessory minerals of ultramafic–mafic intrusions) at Р = 200 MPa, Т = 950°С, and fO2 <QFM with the formation of Fe and Cr chlorides. As shown by thermodynamic calculations, the FeCl3 and FeCl2 equilibrium provides a high chlorine fugacity (fCl2), which is only 3–4 orders of magnitude lower than fCl2 in Pt–PtCl2 equilibrium and 2.5–3.0 orders of magnitude higher than in 1 M HCl aqueous fluid at the same Р‒Т–fO2 parameters. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PLATINUM group
*FUGACITY
*CHROMITE
*CHLORINE
*FLUIDS
Subjects
Details
- Language :
- English
- ISSN :
- 1028334X
- Volume :
- 515
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Doklady Earth Sciences
- Publication Type :
- Academic Journal
- Accession number :
- 177194823
- Full Text :
- https://doi.org/10.1134/S1028334X23603292