See more from this Division: Topical Sessions
See more from this Session: Evolution of Simple Granite Systems (Haplogranites) and Rhyolites: A 50th Anniversary Perspective of the Tuttle and Bowen Studies
Abstract:
The solubility of C-O-H-bearing fluids was investigated in a variety of felsic to mafic melts (rhyolite, dacite, andesite, ferrobasalt, tholeiitic and alkali basalts, tephriphonolite) in the pressure range 200 of 500 MPa. The C-O-H solubility varies strongly as a function of the melt composition (relative variations up to 100%), implying that the solubility of C-O-H fluids predicted by the existing empirical and thermodynamic models for rhyolites and basalts can not be extrapolated to other compositions. Furthermore, the data illustrate that the solubility of CO2 is strongly decreasing with decreasing fO2 at reducing conditions (QFM 1 log unit). The role of the anhydrous composition and of fO2 on volatile incorporation mechanisms in silicate melts coexisting with mixed fluids is still not explored sufficiently to be applied systematically to natural systems and is a challenge for future studies.
See more from this Division: Topical Sessions
See more from this Session: Evolution of Simple Granite Systems (Haplogranites) and Rhyolites: A 50th Anniversary Perspective of the Tuttle and Bowen Studies