Multicomponent diffusion in a basaltic melt: Temperature dependence

Guo, Chenghuan; Zhang, Youxue

doi:10.1016/j.chemgeo.2020.119700

Cited by 8 publications

(7 citation statements)

References 43 publications

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“…While much progress has been made (Kress and Ghiorso, 1995;Liang, 2010;Guo and Zhang, 2016, 2018, multicomponent diffusion matrices are still only available for dry haplobasaltic and basaltic melts at a few temperatures. Effective binary treatment of MgO diffusion during olivine dissolution has been shown to work well experimentally (Chen and Zhang, 2008) and multicomponent diffusion calculations are consistent with effective binary calculations for MgO (Guo and Zhang, 2020). The advantage of multicomponent diffusion treatment is the ability to simultaneously model diffusion profiles of other major oxides, but the temperature dependence of the multicomponent diffusion matrices are less well constrained than that of the effective binary diffusivity of MgO.…”

Section: Effect Of Water Addition and Major Element Composition On Thmentioning

confidence: 62%

Magma Pressure-Temperature-Time Paths During Mafic Explosive Eruptions

et al. 2020

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Newcombe et al. Magma Pressure-Temperature-Time Paths conduit models to magmas containing relatively high initial water concentrations (e.g., arc magmas containing ∼4 wt% water). We note that several processes that have been inferred to occur in volcanic conduits such as magma stalling, magma mingling, open-and closed-system degassing, vapor fluxing, and vapor accumulation (in foam layers or as slugs of gas) are associated with different implied vapor volume fractions during syneruptive ascent. Given the sensitivity of magma P-T-t paths to vapor volume fraction, the syneruptive thermometer presented here may be a means of identifying these processes during the seconds to hours preceding the eruption of mafic magmas.

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Section: Effect Of Water Addition and Major Element Composition On Thmentioning

confidence: 62%

Magma Pressure-Temperature-Time Paths During Mafic Explosive Eruptions

et al. 2020

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“…We compare the results of our mixing model with their experiments after 300 s. The experiments are performed at 1473 K, 0.5 GPa, and 2 wt% of water. The high-pressure conditions employed here, dictated by the limitations of the experimental apparatus, are not expected to affect the mixing process significantly, since the diffusion coefficients are poorly dependent on pressure (Deegan et al, 2010;Guo and Zhang, 2020). The coefficients of the diffusion matrix (D in Equation 7) are defined according to Guo and Zhang (2020).…”

Section: Chemical Mixingmentioning

confidence: 99%

“…The high-pressure conditions employed here, dictated by the limitations of the experimental apparatus, are not expected to affect the mixing process significantly, since the diffusion coefficients are poorly dependent on pressure (Deegan et al, 2010;Guo and Zhang, 2020). The coefficients of the diffusion matrix (D in Equation 7) are defined according to Guo and Zhang (2020). The authors obtained a temperature-dependent diffusion matrix D for an 8-components (SiO 2 , TiO 2 , Al 2 O 3 , FeO, MgO, CaO, Na 2 O, K 2 O) basaltic melt by simultaneously fitting diffusion profiles of couple experiments at different temperatures (1260, 1500 • C) and pressures (0.5-1 Gpa), by considering SiO 2 as the solvent component.…”

Section: Chemical Mixingmentioning

confidence: 99%

“…The time, τ mix at which molecular diffusion becomes important (mixing timescale) can be estimated as the ratio between the thickness of the contaminated melt pocket L and the diffusion coefficient D: τ mix ∼ L 2 /D. We can use a representative diffusion coefficient intermediate between the interdiffusion coefficients of CaO and SiO 2 (D = 10 −12 m 2 s −1 , Table 4 in Guo and Zhang (2020)). CaO and SiO 2 are the most representative oxides, because they are the most abundant in both melts, they undergo most changes from the Ca-rich to the uncontaminated melt and they are the most important in determining the solubility of H 2 O and CO 2 , hence volatile exsolution.…”

Section: Chemical Mixingmentioning

confidence: 99%

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Short-term magma-carbonate interaction: A modelling perspective

Colucci,

Brogi,

Montagna

et al. 2024

Preprint

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The short-term, syn-eruptive interaction of magma with crustal carbonates can largely affect the eruptive style and drive even low-viscosity magmas toward large explosive eruptions. Only a few studies focus on the short-term interaction and the physical processes behind the experimental observations are still poorly understood. In this work, we study for the first time the short-term magma-carbonate interaction process through a modelling approach that provides an interpretative key of the experimental and field observations. We developed thermodynamic and dynamic models for the carbonate dissolution and the mixing and mingling between the contaminated magmapockets and the host magma. We find that mixing and mingling can play a central role in modulating the efficiency of volatile exsolution. The increasing viscosity of the host melt slows down the mingling, hence the mixing process, limiting volatile exsolution. Less efficient mixing and mingling imply that the fingerprints of the short-term magma-carbonate interaction can be preserved in the volcanic deposits. Finally, we highlight a key question that needs to be answered to constrain the mechanism and timescale of the carbonate dissolution process.

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“…The diffusion-driven model of Guo and Zhang (2020) applied multicomponent diffusion to the modeling of olivine and anorthite dissolution in basaltic melts as well as to melt mixing (which happened in the Bushveld igneous complex during its formation). The authors noted that the data do not permit an accurate treatment of the temperature dependence of the diffusion matrix in basaltic system.…”

Section: Kinetic Model Of Guo and Zhang (2020)mentioning

confidence: 99%

Kinetics of melt-rock and melt-rock-fluid interactions in the lithosphere: Critical review of experiments and models of the dissolution of planetary rock-forming silicate minerals in aluminosilicate melts

Borisova,

Schott,

Toplis

2023

Preprint

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Silicate melts and magmas produced at depth encounter rocks at a variety of temperatures and redox conditions during their ascension towards the surface of planetary bodies. Reactions occur between the magma and surrounding material, but despite their potential importance for the regulation of magmatic differentiation, the rates of such interactions are rarely considered and poorly known. The aim of this work is to review the results of high-temperature experiments and kinetic models for the dissolution of the main rock-forming silicate minerals in aluminosilicate melts, partial melting of the main rock types, and reactions between silicate melts and the principal lithologies composing the lithosphere to set the foundations of a new kinetic model.Available experiments on the dissolution of the main rock-forming silicate minerals in aluminosilicate melts far from equilibrium and with high melt-to-rock ratios demonstrate that dissolution rate is controlled either by diffusional or convective transport rather than surface reaction. In contrast, during partial melting and dissolution of magmatic minerals close to equilibrium or under low melt-to-rock ratio (applicable for reactive porous flow, for example), the overall reaction rate can be controlled by surface reaction.The diffusion-controlled dissolution rate r (mol cm -2 s -1 ) of the main rock-forming silicate minerals in aluminosilicate melts at 1300 ± 50°C and <1 GPa pressure in a system with elevated melt-to-rock ratios (and applicable for melt channelization) can be described by an inverse function of the viscosity of the reacting aluminosilicate melts independent on the silicate mineral composition according to: r = 10 -7 η -0.433 , where η (Pa s) is the reacting melt viscosity. This function implies a simple Si atom detachment mechanism during silicate dissolution in the melts. This equation can be applied to the main rock-forming silicate mineral dissolution during melt-rock interaction processes in the lithosphere such as shallow mantle assimilation, at pressures up to 1 GPa. The broad negative correlation between dissolution rate and the reacting melt viscosity demonstrates that lowviscosity mafic-ultramafic magmas are far more prone to contamination by lithosphere materials than high viscosity felsic magmas. An expanded database for the main rock-forming silicate minerals at higher pressure-temperature conditions may be directly applicable for lithosphere assimilation by planetary magmas, magma mixing as well as modeling of diverse types of melt-rock interaction.

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Multicomponent diffusion in a basaltic melt: Temperature dependence

Cited by 8 publications

References 43 publications

Magma Pressure-Temperature-Time Paths During Mafic Explosive Eruptions

Magma Pressure-Temperature-Time Paths During Mafic Explosive Eruptions

Short-term magma-carbonate interaction: A modelling perspective

Kinetics of melt-rock and melt-rock-fluid interactions in the lithosphere: Critical review of experiments and models of the dissolution of planetary rock-forming silicate minerals in aluminosilicate melts

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