Solubility of C-O-H mixtures in natural melts: new experimental data and application range of recent models

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dc.identifier.uri Botcharnikov, Roman E. Freise, Marcus Holtz, Francois Behrens, Harald 2017-10-10T08:43:50Z 2017-10-10T08:43:50Z 2005
dc.identifier.citation Botcharnikov, R.; Freise, M.; Holtz, F.; Behrens, H.: Solubility of C-O-H mixtures in natural melts: new experimental data and application range of recent models. In: Annals of Geophysics 48 (2005), Nr. 4-5, S. 633-646. DOI:
dc.description.abstract The effect of pressure, temperature, and melt composition on CO2 and H2O solubilities in aluminosilicate melts, coexisting with CO2-H2O fluids, is discussed on the basis of previously published and new experimental data. The datasets have been chosen so that CO2 and H2O are the main fluid components and the conclusions are only valid for relatively oxidizing conditions. The most important parameters controlling the solubilities of H2O and CO2 are pressure and composition of melt and fluid. On the other hand, the effect of temperature on volatile solubilities is relatively small. At pressures up to 200 MPa, intermediate compositions such as dacite, in which both molecular CO2 and carbonate species can be dissolved, show higher volatile solubilities than rhyolite and basalt. At higher pressures (0.5 to 1 GPa), basaltic melts can incorporate higher amounts of carbon dioxide (by a factor of 2 to 3) than rhyolitic and dacitic melts. Henrian behavior is observed only for CO2 solubility in equilibrium with H2O-CO2 fluids at pressures < 100 MPa, whereas at higher pressures CO2 solubility varies nonlinearly with CO2 fugacity. The positive deviation from linearity with almost constant CO2 solubility at low water activity indicates that dissolved water strongly enhances the solubility Of CO2. Water always shows non-Henrian solubility behavior because of its complex dissolution mechanism (incorporation of OH-groups and H2O molecules in the melt). The model of Newman and Lowenstern (2002), in which ideal mixing between volatiles in both fluid and melt phases is assumed, reproduces adequately the experimental data for rhyolitic and basaltic compositions at pressures below 200 MPa but shows noticeable disagreement at higher pressures, especially for basalt. The empirical model of Liu et al. (2004) is applicable to rhyolitic melts in a wide range of pressure (0-500 MPa) and temperature (700-1200 degrees C) but cannot be used for other melt compositions. The thermodynamic approach of Papale (1999) allows to calculate the effect of melt composition on volatile solubilities but needs an update to account for more recent experimental data. A disadvantage of this model is that it is not available as a program code. The review indicates a crucial need of new experimental data for scarcely investigated field of pressures and fluid compositions and new models describing evident non-ideality of H-C-O fluid solubility in silicate melts at high pressures. eng
dc.language.iso eng
dc.publisher Bologna : Editrice Compositori Bologna
dc.relation.ispartof Workshop on Gases in Magnetic Evolution, May 11-13, 2003, Rome, Italy
dc.relation.ispartofseries Annals of Geophysics 48 (2005), Nr. 4-5
dc.rights CC BY 3.0 Unported
dc.subject CO2 eng
dc.subject H2O eng
dc.subject solubility eng
dc.subject mixed fluid eng
dc.subject silicate melt eng
dc.subject experimental data eng
dc.subject carbon-dioxide solubilities eng
dc.subject bearing silicate liquids eng
dc.subject ridge basaltic liquids eng
dc.subject co2 solubility eng
dc.subject temperature-dependence eng
dc.subject moderate pressure eng
dc.subject alkalic basalts eng
dc.subject rhyolitic melts eng
dc.subject oxygen fugacity eng
dc.subject 10 kilobars eng
dc.subject.ddc 550 | Geowissenschaften ger
dc.title Solubility of C-O-H mixtures in natural melts: new experimental data and application range of recent models eng
dc.type article
dc.type conferenceObject
dc.type Text
dc.relation.issn 1593-5213
dc.bibliographicCitation.issue 4-5
dc.bibliographicCitation.volume 48
dc.bibliographicCitation.firstPage 633
dc.bibliographicCitation.lastPage 646
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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