CO2 solubility in dacitic melts equilibrated with H2O-CO2 fluids: Implications for modeling the solubility of CO2 in silicic melts

Behrens, Harald; Ohlhorst, Susanne; Holtz, François; Champenois, Michel

doi:10.1016/j.gca.2004.04.019

Cited by 86 publications

(84 citation statements)

References 54 publications

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“…H 2 O determined by more traditional methods of titration are often more precise if dissolved water concentration is high. Behrens et al (2004a), for example, report relative errors on H 2 O melt contents between 2 and 20 % determined using titration. An important consideration in evaluating the model-data comparison of ESM- Fig.…”

Section: Carbon Dioxide Solubility In Silicate Liquidsmentioning

confidence: 99%

An H2O–CO2 mixed fluid saturation model compatible with rhyolite-MELTS

Ghiorso

Gualda

2015

Contrib Mineral Petrol

495

397

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a maximum in melt CO 2 at nonzero H 2 O melt concentrations, regardless of bulk composition. This feature is universal and can be attributed to the dominance of hydroxyl speciation at low water concentrations. The model is applied to four examples. The first involves estimation of pressures from H 2 O-CO 2 -bearing glass inclusions found in quartz phenocrysts of the Bishop Tuff. The second illustrates H 2 O and CO 2 partitioning between melt and fluid during fluid-saturated equilibrium and fractional crystallization of MORB. The third example demonstrates that the position of the quartz-feldspar cotectic surface is insensitive to melt CO 2 contents, which facilitates geobarometry using phase equilibria. The final example shows the effect of H 2 O and CO 2 on the crystallization paths of a high-silica rhyolite composition representative of the late-erupted Bishop Tuff. Software that implements the model is available at ofm-research.org, and the model is incorporated into the latest version (1.1+) of rhyolite-MELTS.

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Section: Carbon Dioxide Solubility In Silicate Liquidsmentioning

confidence: 99%

An H2O–CO2 mixed fluid saturation model compatible with rhyolite-MELTS

Ghiorso

Gualda

2015

Contrib Mineral Petrol

495

397

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“…Absorbance peak heights were determined from transmission spectra using Varian Win-IR Pro software (v3.3.1.014) and converted to concentrations using the Beer-Lambert law. Parameters included the reflectance-determined thicknesses, a nominal rhyolite density of 2.3 g cm −3 (Okumura et al 2003) and the following molar absorptivities: 1.86 mol cm −1 for molecular H 2 O (H 2 O mol ) at 5200 cm −1 (Ihinger et al 1994); 1.50 mol cm −1 for OH-at 4500 cm −1 (Ihinger et al 1994); and 1214 mol cm −1 for CO 2mol at 2350 cm −1 (Behrens et al 2004). …”

Section: Analytical Techniquesmentioning

confidence: 99%

Fine-scale temporal recovery, reconstruction and evolution of a post-supereruption magmatic system

Barker

Wilson

Allan

et al. 2015

Contrib Mineral Petrol

214

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eruption of 25 rhyolitic units starting at ~12 ka. The dacites show strongly zoned minerals and wide variations in meltinclusion compositions, consistent with early magma mixing followed by periods of cooling and crystallisation at depths of >8 km, overlapping spatially with the inferred basal parts of the older Oruanui silicic mush system. The dacites reflect the first products of a new silicic system, as most of the Oruanui magmatic root zone was significantly modified in composition or effectively destroyed by influxes of hot mafic magmas following caldera collapse. The first rhyolites erupted between 12 and 10 ka formed through shallow (4-5 km depth) cooling and fractionation of melts from a source similar in composition to that generating the earlier dacites, with overlapping compositions for melt inclusions and crystal cores between the two magma types. For the successively younger rhyolite units, temporal changes in melt chemistry and mineral phase stability are observed, which reflect the development, stabilisation and maturation of a new, probably unitary, silicic mush system. This new mush system was closely linked to, and sometimes physically interacted with, underlying mafic melts of similar composition to those involved in the Oruanui supereruption. From the inferred depths of magma storage and geographical extent of vent sites, we consider that a large silicic mush system (>200 km 3 and possibly up to 1000 km 3 in volume) is now established at Taupo and is capable of feeding a new episode or cycle of volcanism at any stage in the future.

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“…1) compare the results from the Papale et al (2006) model with the experimental data by Lesne et al (2011) and Behrens et al (2004) for basaltic and dacitic magmas, and properly regulate the FeO/Fe 2 O 3 ratio of the model to fit the experimental results; 2) use Ar solubility as a proxy for predicting N 2 solubility in silicate melts; 3) use the experimental relationship of He and Ar solubility versus dissolved H 2 O in melt found by Paonita et al (2000Paonita et al ( , 2012 in order to compute the effects of H 2 O on Henry's constant of the inert gases.…”

Section: Magma Degassing Model 631 Preliminary Assumptionsmentioning

confidence: 99%