High temperature spectral emissivity of glass and crystal-bearing basalts

Biren, Jonas; Slodczyk, Aneta; Andújar, Joan; Campo, Leire del; Cosson, Lionel; Li, Hao; Véron, Emmanuel; Genevois, Cécile; Ory, Sandra; Aufaristama, Muhammad

doi:10.1016/j.jvolgeores.2022.107623

Cited by 5 publications

(1 citation statement)

References 95 publications

(154 reference statements)

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“…Some of these studies investigated the spectral response of glasses in the visible and near-infrared region (VNIR) [43,47,48], but MIR studies were also performed with different planetary-related purposes: the MIR spectral response of possible impact glasses on planetary surfaces [42,[49][50][51] or of possible silica coatings on particles on planetary terrains was investigated [52][53][54], but glasses were also accounted as possible principal components of volcanic products on other planets [18,41,[55][56][57]. Moreover, a large part of the information that we can retrieve about the MIR spectral response of silicate glasses also comes from studies that are not directly focused on possible planetary implications [11,45,[58][59][60][61][62][63][64][65]. Some of the above-mentioned studies also focused on the variation of silicate glasses' MIR spectral response as a function of grain size [40,41,43,66,67].…”

Section: Introductionmentioning

confidence: 99%

Mid-Infrared (MIR) Spectroscopy of Silicate Glasses as Analogs for Mercury’s Surface: The Influence of Grain Size

et al. 2023

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Volcanic products are widely present on Mercury: they occur as low-viscosity lava flows, but traces of ash deriving from explosive volcanism are also observed. Silicate glasses represent a major component in volcanic products, and it is likely that the fine-powdered regolith on Mercury contains a non-negligible fraction of glassy material. In the laboratory, we have reproduced a Mercury-like silicate glass, from which we have obtained 14 powdered samples with different granulometric characteristics: 8 samples are extremely sorted with grain sizes ranging from 25 to 425 µm, and 6 samples consist of less sorted powders with normal distributions, varying mean values (30, 95, and 160 µm) and standard deviation (40 and 80 µm). The reflectance of samples was investigated in the mid-infrared (MIR) region: we observe how the reflectance intensity increases with grain size, and the presence of extremely fine material defines the emergence of the transparency feature (TF). We provide reference data with qualitative observations and quantitative parameterization of spectral characteristics; in particular, we observe how a small fraction of fine material can greatly influence the spectral response of coarser powders. Results of this work will be crucial for the interpretation of data collected by the BepiColombo mission, but need to be integrated with other possible Mercurian compositions.

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Section: Introductionmentioning

confidence: 99%

Mid-Infrared (MIR) Spectroscopy of Silicate Glasses as Analogs for Mercury’s Surface: The Influence of Grain Size

et al. 2023

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Potential for observing geological diversity from mid-infrared spectra of rocky exoplanets

First,

Mishra,

Gazel

et al. 2024

Nat Astron

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Temperature of the Villarrica Lava Lake from 1963 to 2015 Constrained by Phase-Equilibrium and a New Glass Geothermometer for Basaltic Andesites

Moussallam

Lee

Ding

et al. 2023

Journal of Petrology

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Magma/lava temperature is one of the most basic and critical parameters in volcanology. Yet at many active volcanoes, including during eruptions, this parameter remains poorly constrained due to vent accessibility, with estimates from different geothermometers commonly varying by several tens to more than a hundred degrees. One such volcano is Villarrica, one of the most active and hazardous volcanoes in South America and whose crater hosts a persistent lava lake. Here, we use experimentally determined phase equilibria to constrain the temperature of the Villarrica lava lake. The experiments were all performed at ambient pressure (i.e., 0.1 MPa), ranged in temperature from 1000 to 1250°C and in oxygen fugacity from QFM+1 to QFM–1 (where QFM stands for the quartz-fayalite-magnetite redox buffer). Within the investigated range, fO2 was found to have little to no effect on the phase equilibria and hence the lava lake fO2 could not be constrained. The temperature range explored, however, did bracket the entire liquidus to solidus assemblage evolution. On the basis of these experiments, two empirical geothermometers calibrated strictly between 1050 and 1200°C (i.e., not to be used outside this range) were developed for the Villarrica lava lake based on its matrix glass composition and modal proportion. The 2015 state of the natural system was experimentally reproduced at temperatures around 1141°C. In detail, the lava lake melt composition in the period 1963 to 2015 indicates a cooling trend from 1186 ± 19°C in 1963 to 1153 ± 8°C in 1999-2000 and 1149 ± 28°C in 2015. A generic glass geothermometer was also developed for any Basaltic Andesite composition from the compilation of 175 phase equilibria experiments giving the relation: $Melt\ Temperature\ \left({}^{\circ}C\right)=12.43\times {\mathrm{Al}}_2{\mathrm{O}}_3+10.73\times \mathrm{MgO}+8.51\times \mathrm{CaO}+5.91\times \left({Na}_2\mathrm{O}+{K}_2\mathrm{O}\right)+814.08$ with all oxides in wt.% normalized. The geothermometers we have developed can be used to follow future temperature evolutions of the Villarrica lava lake or to estimate the lava temperature at any basaltic andesite eruption. Their application is simple, requiring only petrographic observations (to quantify the melt proportion) or analysis of the melt composition.

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High temperature spectral emissivity of glass and crystal-bearing basalts

Cited by 5 publications

References 95 publications

Mid-Infrared (MIR) Spectroscopy of Silicate Glasses as Analogs for Mercury’s Surface: The Influence of Grain Size

Mid-Infrared (MIR) Spectroscopy of Silicate Glasses as Analogs for Mercury’s Surface: The Influence of Grain Size

Potential for observing geological diversity from mid-infrared spectra of rocky exoplanets

Temperature of the Villarrica Lava Lake from 1963 to 2015 Constrained by Phase-Equilibrium and a New Glass Geothermometer for Basaltic Andesites

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