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- W2940540612 abstract "A series of hydrothermal diamond anvil cell experiments was conducted to investigate the mobility of Os and Ir in saline and oxidizing hydrothermal fluids as function of fluid pH at temperatures ranging from 500 °C to 1000 °C and pressures resembling upper mantle/lower crust environments (29–1343 MPa). The composition of reactant fluids was monitored in real time and at in situ conditions by Raman vibrational spectroscopy. Results revealed the formation of OsO volatile aqueous species under oxidizing redox conditions (∼+5 ΔFMQ) and at temperatures exceeding 850 °C. These species were detected in an immiscible phase separated from the homogeneous fluid at low pressure conditions (<150 MPa). Based on previous experimental and theoretical studies, the Os-bearing species observed in situ are attributed to the presence of OsO4(g). Volatile transport of Os in high temperature/pressure magmatic fluids, therefore, may include oxide aqueous species along with Os-Cl complexation. Possible evidence of Ir oxidation was provided by the formation of H2(aq) in Ir-H2O experiments at 700–800 °C and pressures of 543–793 MPa. Experimental data support the role of slab-derived fluids in yielding elevated Os/Ir ratios in metasomatized xenoliths relative to primitive upper mantle composition through the enhanced mobility of Os in the form of Cl- and oxygen-bearing volatile aqueous complexes." @default.
- W2940540612 created "2019-05-03" @default.
- W2940540612 creator A5041303548 @default.
- W2940540612 date "2019-06-01" @default.
- W2940540612 modified "2023-10-01" @default.
- W2940540612 title "Hydrothermal oxidation of Os" @default.
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- W2940540612 doi "https://doi.org/10.1016/j.gca.2019.04.019" @default.
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