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- W2225677652 abstract "Abstract The behavior of volatiles in silicate‐COH melts and fluids and hydrogen isotope fractionation between melt and fluid were determined experimentally to advance our understanding of the role of volatiles in magmatic processes. Experiments were conducted in situ while the samples were at the desired temperature and pressure to 825°C and ~1.6 GPa and with variable redox conditions. Under oxidizing conditions, melt and fluid comprised CO 2 , CO 3 , HCO 3 , OH, H 2 O, and silicate components, whereas under reducing conditions, the species were CH 4 , H 2 , H 2 O, and silicate components. Temperature‐dependent hydrogen isotope exchange among structural entities within coexisting fluids and melts yields ΔH values near 14 and 24 kJ/mol and −5 and −1 kJ/mol under oxidizing and reducing conditions, respectively. This temperature (and probably pressure)‐dependent D/H fractionation is because of interaction between D and H and silicate and C‐bearing species in silicate‐saturated fluids and in COH fluid‐saturated melts. The temperature‐ and pressure‐dependent D/H fractionation factors suggest that partial melts in the presence of COH volatiles in the upper mantle can have δD values 100% or more lighter relative to coexisting silicate‐saturated fluid. This effect is greater under oxidizing than under reducing conditions. It is suggested that δD variations of upper mantle mid‐ocean ridge basalt (MORB) sources, inferred from the δD of MORB magmatic rocks, can be explained by variations in redox conditions during melting. Lower δD values of the MORB magma reflect more reducing conditions in the mantle source." @default.
- W2225677652 created "2016-06-24" @default.
- W2225677652 creator A5023039775 @default.
- W2225677652 date "2015-11-01" @default.
- W2225677652 modified "2023-10-05" @default.
- W2225677652 title "Hydrogen isotope fractionation and redox-controlled solution mechanisms in silicate-COH melt + fluid systems" @default.
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- W2225677652 doi "https://doi.org/10.1002/2015jb011954" @default.
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