A CO2 solubility model for silicate melts from fluid saturation to graphite or diamond saturation

Eguchi, James; Dasgupta, Rajdeep

doi:10.1016/j.chemgeo.2018.04.012

Cited by 32 publications

(22 citation statements)

References 69 publications

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“…Using the range in Nb concentrations in depleted and enriched melts in central Iceland [86,96] [96], we estimate that primitive melts ascending from Moho depths beneath central Iceland may contain between 800 to 4800 ppm CO 2 . The carbon solubility model of Eguchi & Dasgupta [97] indicates that melts containing this amount of CO 2 will become saturated in a CO 2 -rich exsolved fluid phase at 0.12 to 0.7 GPa (approx. 5 to 25 km depth).…”

Section: The Role Of Exsolved Magmatic Carbon Dioxide In Inducing Seismicitymentioning

confidence: 99%

Melt movement through the Icelandic crust

White

Edmonds

Maclennan

et al. 2019

Phil. Trans. R. Soc. A.

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Section: The Role Of Exsolved Magmatic Carbon Dioxide In Inducing Seismicitymentioning

confidence: 99%

Melt movement through the Icelandic crust

White

Edmonds

Maclennan

et al. 2019

Phil. Trans. R. Soc. A.

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“…It is also worth noting that all the models discussed here only consider the effect of redox through terms for Fe 2+ and Fe 3+ in the melt, constraining their applicability to melts more oxidising than the IW buffer. In more reducing conditions, the co-existing CO 2 -rich phase may be graphite or diamond rather than a CO 2 -rich vapour phase (Eguchi & Dasgupta, 2018), and the dissolved volatile species may be CO, CH 4 and H 2 (Mysen et al, 2009). This means that extreme caution is required when applying these solubility models to highly reducing conditions such as those found on other planetary bodies (e.g., the Moon, Mars and Mercury; Li et al, 2017).…”

Section: Future Workmentioning

confidence: 99%

“…7a of Iacono-Marziano et al, 2012 We do not consider the models of X. Duan (2014), Eguchi and Dasgupta (2018), or Burgisser et al (2015) because no tool exists to automate the necessary calculations. We also do not discuss models with more limited pressure (P), temperature (T) or compositional (X) ranges.…”

Section: Introductionmentioning

confidence: 99%

VESIcal Part II: A critical approach to volatile solubility modelling using an open-source Python3 engine

Wieser¹,

Iacovino²,

Matthews³

et al. 2022

Preprint

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Accurate models of H2O and CO2 solubility in silicate melts are vital for understanding volcanic plumbing systems. These models are used to estimate the depths of magma storage regions from melt inclusion volatile contents, investigate the role of volatile exsolution as a driver of volcanic eruptions, and track the degassing paths followed by magma ascending to the surface. However, despite the large increase in the number of experimental constraints over the last two decades, many recent studies still utilize the earlier generation of models, which were calibrated on experimental datasets with restricted compositional ranges. This may be because many of the available tools for more recent models require large numbers of input parameters to be hand-typed (e.g., temperature, concentrations of H2O, CO2, and 8--14 oxides), making them difficult to implement on large datasets. Here, we use a new open-source Python3 tool, VESIcal, to critically evaluate the behaviours and sensitivities of different solubility models for a range of melt compositions. Using literature datasets of andesitic-dacitic experimental products and melt inclusions as case studies, we illustrate the importance of evaluating the calibration dataset of each model. Finally, we highlight the limitations of particular data presentation methods such as isobar diagrams, and provide suggestions for alternatives, and best practices regarding the presentation and archiving of data. This review will aid the selection of the most applicable solubility model for different melt compositions, and identifies areas where additional experimental constraints are required

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“…Figure 6 demonstrates that applying the empirical expression to the more enriched eruptions brings their saturation pressures into line with the depleted eruptions, when the CO 2 solubility model by Iacono-Marziano et al (2012) is applied to the inclusions from depleted eruptions. However, a discrepancy exists if the saturation pressures for depleted eruptions are calculated using the models by Shishkina et al (2014) and Eguchi and Dasgupta (2018a) (Supplementary Figure 5).…”

Section: A Global Array Controlled By Degassing?mentioning

confidence: 99%

Melt inclusion constraints on mantle carbon heterogeneity within an individual mantle plume and at the global scale

Matthews¹,

Shorttle²,

Maclennan³

et al. 2019

Preprint

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The Earth’s mantle holds more carbon than its oceans, atmosphere and continents combined, yet the distribution of carbon within the mantle remains uncertain. Global variations in the carbon content of the depleted mantle have been inferred from carbon-trace element systematics of ultra-depleted mid-ocean ridge glasses and melt inclusions, though the origin of mantle carbon variability remains uncertain. A variety of observations suggest that the mantle plumes underlying ocean islands have high bulk carbon contents, but the characterisation of individual mantle plume components has not been possible.We supplement the existing melt inclusion data from Iceland with four new datasets, significantly en- hancing the spatial and geochemical coverage. Within the combined dataset there is significant variation in melt inclusion CO2/Ba ratio, which is tightly correlated with trace element enrichment. The trends in CO2/Ba–Ba space displayed by our new data coincide with the same trends in data compiled from global ocean islands and mid-ocean ridges, forming a global array. The overall structure of the global CO2/Ba array is not a property of the source, instead controlled by CO2 degassing before melt inclusion entrapment, and CO2 loss by decrepitation following inclusion entrapment.The position of melt inclusion datasets within the global array allows us to filter out inclusions likely tohave undergone decrepitation. Providing earlier CO2 degassing and magma mixing have not destroyed themantle signal, the remaining inclusions may preserve mantle CO2/Ba values. Using the observed covariationof the filtered CO2/Ba ratio with radiogenic isotope tracers of mantle source, we find CO2 concentrationsin the Icelandic depleted mantle of 102+53 -27 ppmw, typical of mantle underlying the mid-ocean ridge system,and high CO concentrations of 2.2+3.8 -1.5 wt% associated with the high 3He/4He component of the Iceland plume. However, source and process are difficult to deconvolve for the eruptions most sensitive to enriched, or recycled, mantle components; the presently available data is consistent with recycled material being either enriched or depleted in carbon.Extending our approach globally, we find no systematic variation in CO2/Ba or CO2/Nb with enrichment (in the absence of a primordial mantle contribution). The lack of global co-variation suggests mechanisms recycling CO2 from the surface into the convecting mantle are decoupled from those recycling most trace elements. However, the variation of CO2/Nb with Ba/Nb suggests Ba may behave similarly to CO2 during recycling.

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A CO2 solubility model for silicate melts from fluid saturation to graphite or diamond saturation

Cited by 32 publications

References 69 publications

Melt movement through the Icelandic crust

Melt movement through the Icelandic crust

VESIcal Part II: A critical approach to volatile solubility modelling using an open-source Python3 engine

Melt inclusion constraints on mantle carbon heterogeneity within an individual mantle plume and at the global scale

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