Solubility and solution mechanisms of C-O-H volatiles in silicate melt with variable redox conditions and melt composition at upper mantle temperatures and pressures

Solubility and solution mechanisms in silicate melts of oxidized and reduced C-bearing species in the C-O-H system have been determined experimentally at 1.5 GPa and 1400 degrees C with mass spectrometric, NMR, and Raman spectroscopic methods. The hydrogen fugacity, f(H2), was controlled in the range between that of the iron-wustite-H(2)O (IW) and the magnetite-hematite-H(2)O (MH) buffers. The melt polymerization varied between those typical of tholeiitic and andesitic melts.