[SMP29-P07] Experimental modeling of eclogite and C-O-H fluid interaction in the subduction zones
In this study, we employed in situ spectroscopic methods in combination with the diamond anvil cell (DAC) technique for investigation of C-O-H fluid behavior and its influence on phase relationships in the eclogite–5.75H2O–CH4 system at temperatures up to 1000 degree C and pressures exceeding 5 GPa. We designed a new cell assembly for Mao-type symmetric diamond anvil cell with large optical access to the sample in order to make it suitable for infrared and Raman measurements directly at high-pressure and high-temperature conditions. Mineral phase assemblages, observed during experiments, are consistent with those described in the dry system of the similar basaltic composition . At the same time, miscibility between aqueous and carbonaceous components in the fluid phase coexisting with silicate minerals was confirmed at temperatures above 800 degree C and pressures above 3.2 GPa.
 Shirey, S.B., Cartigny, P., Frost, D.J., Keshav, S., Nestola, F., Nimis, P., Pearson, D.G., Sobolev, N.V. and Walter, M.J. (2013) Rev. Mineral. Geochem., 75, 355-421.
 Belonoshko, A. and Saxena, S. (1992) Geochim. Cosmochim. Acta, 56, 3611-3626.
 Yasuda, A., Fujii, T. and Kurita, K. (1994) J. Geophys. Res.: Solid Earth, 99, 9401-9414.