The effect of the [Na/(Na+K)] ratio on Fe speciation in phonolitic glasses

Cicconi, Maria Rita; Giuli, Gabriele; Ertel-Ingrisch, Werner; Paris, Eleonora; Dingwell, Donald B.

doi:10.2138/am-2015-5155

Cited by 33 publications

(24 citation statements)

References 48 publications

(87 reference statements)

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“…For example, Mysen et al [259] reported a slight decrease of the slope according to the ionic potential of the alkaline-earth cation in alkaline-earth silicate glasses. This trend is corroborated by the recent result of Cicconi et al [260], who observed that the mean ionic field strength of the alkali metal cations influence the slope of the log # k vs log ( mU k. mU n. ) relationship in multicomponent glasses.…”

Section: Temperature Oxygen Fugacity and Pressure Effectssupporting

confidence: 82%

“…Regarding the local environment of Fe in silicate glasses, data on simplified and multicomponent systems, often, are contradictory. Ferric iron is mainly regarded as 4-fold coordinated, although higher coordination numbers have been also reported [260,269,[287][288][289][290][291][292][293][294][295][296][297][298]. Regarding Fe 2+ , its structural environment is even more debated.…”

Section: Compositional Effectsmentioning

confidence: 99%

“…The presence of Fe 2+ in CN 6 has been reported [241,288,299], along with trigonal bipyramidal and tetrahedral coordination [300][301][302][303][304]. Usually, it is safe to assert that Fe 2+ has an average coordination close to 5, which could be possibly translated as a coexistence of 4-, 5-and 6-or just the simultaneous presence of 4-and 6-fold Fe 2+ coordinated [260]. [241,243,246].…”

Section: Compositional Effectsmentioning

confidence: 99%

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Silicate Glasses

et al. 2019

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Silicate glasses are important cultural, societal and geological materials. Geologic glasses testify for the igneous activity of the Earth and, for instance, represented important source of tools and ornamental objects during the Paleolithic. Nowadays, silicate glasses are used to build technical materials, such as smartphone screens or glass matrix for stabilizing hazardous radioactive wastes. Therefore, silicate glasses are central to the history of the Earth and of the humanity. The compositional landscape of natural and industrial silicate glasses is vast, with various elements that all influence differently the glass properties and structure. The SiO 4 tetrahedral framework, backbone of silicate glasses, is variously influenced by the introduction of network modifier metal cations or network former aluminium cations. Industrial and geologic silicate glasses further contain multivalent elements (e.g., Fe 2+/3+), rare-earth elements, and volatile elements (H, C, S, Cl, F, I) that play different roles on the glass structure and properties. This chapter proposes to review the link between the structure, the properties and the chemical composition of silicate glasses.

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Section: Temperature Oxygen Fugacity and Pressure Effectssupporting

confidence: 82%

Section: Compositional Effectsmentioning

confidence: 99%

Section: Compositional Effectsmentioning

confidence: 99%

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Silicate Glasses

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“…From the redox perspective, iron plays different roles depending on its oxidation state (Mysen and Richet 2005;Cicconi et al 2015 and references therein): Fe 2+ acts as a network-modifier, whereas Fe 3+ plays a more complex role that will be discussed later. Given the abundance of iron in melts, Fe 3+ /Fe 2+ exchanges can have dramatic effects on melt structure and properties.…”

Section: Composition and Structure: Who Controls What?mentioning

confidence: 99%

Magmas are the Largest Repositories and Carriers of Earth’s Redox Processes

2020

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Magma is the most important chemical transport agent throughout our planet. This paper provides an overview of the interplay between magma redox, major element chemistry, and crystal and volatile content, and of the influence of redox on the factors that drive igneous system dynamics. Given the almost infinite combinations of temperature, pressure, and chemical compositions relevant to igneous petrology, we focus on the concepts and methods that redox geochemistry provides to understand magma formation, ascent, evolution and crystallization. Particular attention is paid to the strong and complex interplay between melt structure and chemistry, and to the influence that redox conditions have on melt properties, crystallization mechanisms and the solubility of volatile components.

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“…The ferric-ferrous ratio of equilibrated silicate melts depends on the temperature, redox state, and the chemical composition (including the volatile content) of the melt (Kress and Carmichael 1991;Mysen 1991;Ottonello et al 2001;Botcharnikov et al 2005;Moretti 2005;Giuli et al 2012;Borisov et al 2015;Cicconi et al 2015). Thus a precise quantification of the ferric-ferrous ratio in silicate melts and glasses is a crucial constraint for the adequate parameterization of both the composition-dependence of physical properties (e.g., liquid viscosity and density) and the redox conditions prevailing in magmatic systems.…”

Section: Introductionmentioning

confidence: 99%

Models for the estimation of Fe³⁺/Fe_totratio in terrestrial and extraterrestrial alkali- and iron-rich silicate glasses using Raman spectroscopyk

Genova¹,

Hess²,

Chevrel³

et al. 2016

American Mineralogist

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To develop Raman spectroscopy as a quantitative tool in both geosciences and planetary sciences the effect of iron oxidation state (Fe 3+ /Fe tot) on the Raman spectra of basaltic and pantelleritic glasses has been investigated. We have used remelted pantellerite from Pantelleria Island and synthetic ironrich basaltic glasses [from Chevrel et al. (2014)]. The Raman spectra of pantelleritic glasses reveal dramatic changes in the high wavelength region of the spectrum (800-1200 cm-1) as iron oxidation state changes. In particular the 970 cm-1 band intensity increases with increasing oxidation state of the glass (Fe 3+ /Fe tot ratio from 0.24 to 0.83). In contrast, Raman spectra of the basaltic glasses do not show the same oxidation state sensitivity (Fe 3+ /Fe tot ratio from 0.15 to 0.79). A shift, however, of the 950 cm-1 band to high wavenumber with decreasing iron oxidation state can be observed. We present here two empirical parameterizations (for silica-and alkali-rich pantelleritic glasses and for iron-rich basaltic glasses) to enable estimation of the iron oxidation state of both anhydrous and hydrous silicate glasses (up to 2.4 wt% H 2 O). The validation of the models derived from these parameterizations have been obtained using the independent characterization of these melt samples plus a series of external samples via wet chemistry. The "pantelleritic" model can be applied within SiO 2 , FeO, and alkali content ranges of ~69-75, ~7-9, and ~8-11 wt%, respectively. The "basaltic" model is valid within SiO 2 , FeO, and alkali content ranges of ~42-54, ~10-22, and ~3-6 wt%, respectively. The results of this study contribute to the expansion of the compositionally dependent database previously presented by Di Genova et al. (2015) for Raman spectra of complex silicate glasses. The applications of these models range from microanalysis of silicate glasses (e.g., melt inclusions) to handheld in situ terrestrial field investigations and studies under extreme conditions such as extraterrestrial (i.e., Mars), volcanic, and submarine environments.

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The effect of the [Na/(Na+K)] ratio on Fe speciation in phonolitic glasses

Cited by 33 publications

References 48 publications

Silicate Glasses

Silicate Glasses

Magmas are the Largest Repositories and Carriers of Earth’s Redox Processes

Models for the estimation of Fe³⁺/Fe_totratio in terrestrial and extraterrestrial alkali- and iron-rich silicate glasses using Raman spectroscopyk

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The effect of the [Na/(Na+K)] ratio on Fe speciation in phonolitic glasses

Cited by 33 publications

References 48 publications

Silicate Glasses

Silicate Glasses

Magmas are the Largest Repositories and Carriers of Earth’s Redox Processes

Models for the estimation of Fe3+/Fetotratio in terrestrial and extraterrestrial alkali- and iron-rich silicate glasses using Raman spectroscopyk

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Product

Resources

About

Models for the estimation of Fe³⁺/Fe_totratio in terrestrial and extraterrestrial alkali- and iron-rich silicate glasses using Raman spectroscopyk