Abstract
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 Os O 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 (
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