SolEx: A model for mixed COHSCl-volatile solubilities and exsolved gas compositions in basalt

Witham, Fred; Blundy, Jonathan D.; Kohn, Simon C.; Lesne, Priscille; Dixon, J. Brandon; Churakov, Sergey V.; Botcharnikov, Roman E.

doi:10.1016/j.cageo.2011.09.021

Cited by 121 publications

(109 citation statements)

References 70 publications

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“…In each set, one run was degassing melt in closed system, another was degassing melt in open system, and the last run was decompressing pure gas. The initial conditions of the two sets are such that a comparison with the SolEx model (Witham et al, 2012) can be carried out. This means that the starting pressure, basaltic melt composition, and melt H 2 O and CO 2 contents are similar between the two models.…”

Section: Decompression Runsmentioning

confidence: 99%

“…Owing to such complexity, not all of these models have been released to the volcanological community in a userfriendly format. Notable exceptions are the models VolatilCalc (Newman and Lowenstern, 2002), PELE (Boudreau, 1999), and SolEx (Witham et al, 2012), and the models of Papale et al (2006), Iacono-Marziano et al (2012), Ariskin et al (2013), and Duan (2014). Altogether, these models cover a wide range of situations of geological interest, but each of them handles a specific range of intensive parameters and volatile and melt compositions.…”

Section: Introductionmentioning

confidence: 97%

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Simulating the behavior of volatiles belonging to the C–O–H–S system in silicate melts under magmatic conditions with the software D-Compress

Burgisser

Alletti

Scaillet

2015

Computers & Geosciences

107

125

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a b s t r a c tModeling magmatic degassing, or how the volatile distribution between gas and melt changes at pressure varies, is a complex task that involves a large number of thermodynamical relationships and that requires dedicated software. This article presents the software D-Compress, which computes the gas and melt volatile composition of five element sets in magmatic systemsIt has been calibrated so as to simulate the volatiles coexisting with three common types of silicate melts (basalt, phonolite, and rhyolite). Operational temperatures depend on melt composition and range from 790 to 1400°C. A specificity of D-Compress is the calculation of volatile composition as pressure varies along a (de)compression path between atmospheric and 3000 bars. This software was prepared so as to maximize versatility by proposing different sets of input parameters. In particular, whenever new solubility laws on specific melt compositions are available, the model parameters can be easily tuned to run the code on that composition. Parameter gaps were minimized by including sets of chemical species for which calibration data were available over a wide range of pressure, temperature, and melt composition. A brief description of the model rationale is followed by the presentation of the software capabilities. Examples of use are then presented with outputs comparisons between D-Compress and other currently available thermodynamical models. The compiled software and the source code are available as electronic supplementary materials.

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Section: Decompression Runsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Simulating the behavior of volatiles belonging to the C–O–H–S system in silicate melts under magmatic conditions with the software D-Compress

Burgisser

Alletti

Scaillet

2015

Computers & Geosciences

107

125

View full text Add to dashboard Cite

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“…Closed-system degassing has been argued to be significant in basaltic magmatic systems (e.g., Allard et al 2005;Lloyd et al 2014;Ferguson et al 2016). Volatile saturation models (Newman and Lowenstern 2002;Witham et al 2012) predict that the Holuhraun carrier liquid becomes water-saturated at pressures between ~ 1.0 and 0.4 kbar during closed-system degassing, with the variability arising from the choice of initial magmatic CO 2 content and hence the mass percent of pre-existing exsolved vapour present. Assuming an initial volatile budget of 3000 ppm CO 2 and 0.6 wt% H 2 O, the Holuhraun melt will begin to degas H 2 O at 1.0 kbar, but significant H 2 O loss only occurs at pressures below ~ 0.4 kbar.…”

Section: H 2 O Ce and The Diffusive Re-equilibration Of H 2 O: Consmentioning

confidence: 99%

Melt inclusion constraints on petrogenesis of the 2014–2015 Holuhraun eruption, Iceland

Hartley

Bali

Maclennan

et al. 2018

Contrib Mineral Petrol

129

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The 2014-2015 Holuhraun eruption, on the Bárðarbunga volcanic system in central Iceland, was one of the best-monitored basaltic fissure eruptions that has ever occurred, and presents a unique opportunity to link petrological and geochemical data with geophysical observations during a major rifting episode. We present major and trace element analyses of melt inclusions and matrix glasses from a suite of ten samples collected over the course of the Holuhraun eruption. The diversity of trace element ratios such as La/Yb in Holuhraun melt inclusions reveals that the magma evolved via concurrent mixing and crystallization of diverse primary melts in the mid-crust. Using olivine-plagioclase-augite-melt (OPAM) barometry, we calculate that the Holuhraun carrier melt equilibrated at 2.1 ± 0.7 kbar (7.5 ± 2.5 km), which is in agreement with the depths of earthquakes (6 ± 1 km) between Bárðarbunga central volcano and the eruption site in the days preceding eruption onset. Using the same approach, melt inclusions equilibrated at pressures between 0.5 and 8.0 kbar, with the most probable pressure being 3.2 kbar. Diffusion chronometry reveals minimum residence timescales of 1-12 days for melt inclusionbearing macrocrysts in the Holuhraun carrier melt. By combining timescales of diffusive dehydration of melt inclusions with the calculated pressure of H 2 O saturation for the Holuhraun magma, we calculate indicative magma ascent rates of 0.12-0.29 m s −1 . Our petrological and geochemical data are consistent with lateral magma transport from Bárðarbunga volcano to the eruption site in a shallow-to mid-crustal dyke, as has been suggested on the basis of seismic and geodetic datasets. This result is a significant step forward in reconciling petrological and geophysical interpretations of magma transport during volcano-tectonic episodes, and provides a critical framework for the interpretation of premonitory seismic and geodetic data in volcanically active regions.

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“…The degassing of CO 2 from the magma is obvious when reporting H 2 O versus CO 2 in melt inclusions on a graph along with the saturation curves (SolEx: Witham et al 2012, Figure 4). There are two groups, one with H 2 O < 2 wt.% and the other with H 2 O > 2 wt.%.…”

Section: Magma Chamber Depth and H 2 O-co 2 Saturation Pressurementioning

confidence: 99%

Volatile (F and Cl) concentrations in Iwate olivine-hosted melt inclusions indicating low-temperature subduction

et al. 2014

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Investigation of olivine-hosted melt inclusions provides information about the abundance of volatile elements that are often lost during subaerial eruptions of lavas. We have measured the abundances of H 2 O, CO 2 , F, Cl, and S as well as Pb isotopes in 29 melt inclusions in the scoria of the 1686 eruption of the Iwate volcano, a frontal-arc volcano in the northeast Japan arc. Pb Isotope compositions identify that Iwate magma is derived from a mixture of depleted mantle, subducted basalt, and sediment. Systematics of F in comparison to MORB and other arc magma indicates that (1) the slab surface temperature must be among the lowest on Earth and (2) hydrous minerals, such as amphibole, humites, and/or mica, must be present as residual phases during the dehydration of the slab.

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SolEx: A model for mixed COHSCl-volatile solubilities and exsolved gas compositions in basalt

Cited by 121 publications

References 70 publications

Simulating the behavior of volatiles belonging to the C–O–H–S system in silicate melts under magmatic conditions with the software D-Compress

Simulating the behavior of volatiles belonging to the C–O–H–S system in silicate melts under magmatic conditions with the software D-Compress

Melt inclusion constraints on petrogenesis of the 2014–2015 Holuhraun eruption, Iceland

Volatile (F and Cl) concentrations in Iwate olivine-hosted melt inclusions indicating low-temperature subduction

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