Estimation of Chlorine Fugacity in Low-Н2О Fluid of the C–O–(H)–NaCl System in the Cumulus of Ultramafic–Mafic Intrusions

Simakin, A.G.; Shaposhnikova, O.Y.; Devyatova, V.N.; Isaenko, S.I.; Eremin, D.D.

Авторы: Simakin A.G., Shaposhnikova O.Yu, Devyatova V.N., Isaenko S.I., Eremin D.D.
Журнал: Doklady Earth Sciences
Том: 515
Номер: 1
Год издания: 2024
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 423
Последняя страница: 429
DOI: 10.1134/s1028334x23603292
Аннотация: 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 thatnative 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 NaClwith 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 HClaqueous fluid at the same Р‒Т–fO2 parameters.
Добавил в систему: Шапошникова Ольга Юрьевна

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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 Intrusionsстатья

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