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Article

Experimental Study of Pt Solubility in the CO-CO2 Fluid at Low fO2 and Subsolidus Conditions of the Ultramafic-Mafic Intrusions

1
Institute of Experimental Mineralogy, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russia
2
Institute of the Earth Physics, Russian Academy of Sciences, B. Gruzinskaya Str., 10123242 Moscow, Russia
3
Géosciences Environnement Toulouse, GET-UMR 5563-OMP-CNRS, Université de Toulouse III, IRD, CNES, 14 Avenue E. Belin, 31400 Toulouse, France
4
Geological Department, Lomonosov Moscow State University, Vorobievu Gori, 119991 Moscow, Russia
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Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Kosygin Str. 19, 119334 Moscow, Russia
6
Institute of Geology, Komi Science Centre, Ural Branch of Russian Academy of Sciences, Pervomayskaya, 54, 167982 Syktyvkar, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Galina Palyanova
Minerals 2021, 11(2), 225; https://doi.org/10.3390/min11020225
Received: 22 December 2020 / Revised: 16 February 2021 / Accepted: 18 February 2021 / Published: 23 February 2021
The solubility of Pt in CO-CO2 fluid was studied experimentally at P = 50–200 MPa and T = 950 °C. A mixture of MgC2O4 and MgCO3 was used as a source of the fluid. Upon the reaction of the Pt capsule walls and the fluid, a carbonyl of platinum is formed. The use of the high-temperature quartz ceramics as a fluid trap avoids the effect of mechanical contamination with Pt from the eroded capsule walls. The total content of platinum in the porous fluid traps was measured by the Electrothermal Atomic Absorption (ET-AAS) method. In some experiments, the local analysis of traps was carried out by the Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) method. The composition of fluid in bubbles captured in an albite glass trap was studied by micro-Raman spectroscopy. On the capsule walls and MgO, Pt “whiskers” of submicron diameter were observed, which were formed as a product of carbonyl decomposition during quenching. About 5–15% of carbonyl withstands quenching resulting in 1.5 to 2 ppm Pt soluble in acetone (runs at P = 200 MPa) in a quartz glass trap. The amount of Pt soluble in acetone from the capsule walls corresponds to a concentration of up to 8 ppm in the fluid. A high content of soluble Pt of 2000–3000 ppm was determined in a carbon coated MgO matrix. Our study demonstrated that the solubility of Pt in the CO-CO2 fluid is 15–150 ppm, presumably in the form of Pt3(CO)62− under conditions corresponding to the conditions of the subsolidus stage of layered ultramafic-mafic and ultramafic-alkaline intrusions formation. Our preliminary data showed that this solubility will increase with the addition of water at low fO2. View Full-Text
Keywords: platinum; mafic-ultramafic intrusion; carbonic fluid; isoferroplatinum; platinum carbonyl platinum; mafic-ultramafic intrusion; carbonic fluid; isoferroplatinum; platinum carbonyl
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MDPI and ACS Style

Simakin, A.; Salova, T.; Borisova, A.Y.; Pokrovski, G.S.; Shaposhnikova, O.; Tyutyunnik, O.; Bondarenko, G.; Nekrasov, A.; Isaenko, S.I. Experimental Study of Pt Solubility in the CO-CO2 Fluid at Low fO2 and Subsolidus Conditions of the Ultramafic-Mafic Intrusions. Minerals 2021, 11, 225. https://doi.org/10.3390/min11020225

AMA Style

Simakin A, Salova T, Borisova AY, Pokrovski GS, Shaposhnikova O, Tyutyunnik O, Bondarenko G, Nekrasov A, Isaenko SI. Experimental Study of Pt Solubility in the CO-CO2 Fluid at Low fO2 and Subsolidus Conditions of the Ultramafic-Mafic Intrusions. Minerals. 2021; 11(2):225. https://doi.org/10.3390/min11020225

Chicago/Turabian Style

Simakin, Alexander, Tamara Salova, Anastassia Y. Borisova, Gleb S. Pokrovski, Olga Shaposhnikova, Oksana Tyutyunnik, Galina Bondarenko, Alexey Nekrasov, and Sergey I. Isaenko. 2021. "Experimental Study of Pt Solubility in the CO-CO2 Fluid at Low fO2 and Subsolidus Conditions of the Ultramafic-Mafic Intrusions" Minerals 11, no. 2: 225. https://doi.org/10.3390/min11020225

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