Water contents of felsic melts: application to the rheological properties of granitic magmas
Published:January 01, 1996
F. Holtz, B. Scaillet, H. Behrens, F. Schulze, M. Pichavant, 1996. "Water contents of felsic melts: application to the rheological properties of granitic magmas", The Third Hutton Symposium on the Origin of Granites and Related Rocks, M. Brown, P.A. Candela, D.L. Peck, W.E. Stephens, R.J. Walker, E-an Zen
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New experimental determinations of water solubility in haplogranitic melts (anhydrous compositions in the system Qz–Ab–Or and binary joins) and of the viscosity of hydrous Qz28Ab38Or34 melts (normative proportions) and natural peraluminous leucogranitic melt (Gangotri, High Himalaya) are used to constrain the evolution of viscosity of ascending magmas, depending on their P–T paths.
At constant pressure, in the case of fluid-absent melting conditions, with water as the main volatile dissolved in the melts, the viscosity of melts generated from quartzo-feldspathic protoliths is lower at low temperature than at high temperature (difference of 1–2 log units between...