Micro-Raman spectroscopy for a comprehensive understanding of the structural evolution of Basaltic-Andesite and Trachybasalt multiphase systems

Cassetta, M.; Vetere, Francesco; Zanatta, M.; Perugini, Diego; Alvaro, Matteo; Giannetta, Beatrice; Zaccone, Claudio; Daldosso, N.

doi:10.1016/j.chemgeo.2022.121241

Cited by 6 publications

(3 citation statements)

References 76 publications

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“…A simultaneous thermogravimetric and DSC analyzer (TGA-DSC 3+, Mettler Toledo, Madison, WI, USA) was used to conduct the thermal analysis as described in refs. [29,30]. To remove the thermal history of the sample, a polished glass chip (about 10 mg) was put in an alumina crucible and heated from 300 to 1070 K at 20 K min −1 under air flowing at a rate of 100 mL min −1 .…”

Section: Methodsmentioning

confidence: 99%

Viscosity, Boson Peak and Elastic Moduli in the Na2O-SiO2 System

Cassetta,

Mariotto,

Daldosso

et al. 2023

Minerals

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The temperature and chemical dependence of the melt viscosity are ubiquitous in the model development of the volcanic dynamics, as well as in the glass production and design. We focussed on the yet-explored relationship between the bulk and shear moduli ratio and boson peak with the melt fragility of their parental glasses. Here, we explored the extension of the observed trend by testing the conventional binary system Na2O-SiO2, thus providing new evidence supporting the link between the flow of melts and supercooled liquids and the vibrational dynamics of their parental glasses. This was accomplished by integrating new low-frequency Raman measurements and integrating data from the literature on Brillouin light scattering and viscometry. This approach allows us to feed the MYEGA equation with reliable input parameters to quantitatively predict the viscosity of the Na2O-SiO2 system from the liquid up to the glass transition.

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Section: Methodsmentioning

confidence: 99%

Viscosity, Boson Peak and Elastic Moduli in the Na2O-SiO2 System

Cassetta,

Mariotto,

Daldosso

et al. 2023

Minerals

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“…Taking into account the water free samples VL46 and VL47 (Figure 5), having a crystal content of about 20 and 30 area%, respectively, we can calculate the effective viscosity of the crystal bearing system using the models proposed by Sato [2005] and Vona et al [2011] [η r = η eff /η m where η r is the relative viscosity, η eff is the effective viscosity of the liquid containing a fraction of crystals, and η m is the viscosity of the melt using the model of Vetere et al, 2007]. Moreover, as required by the Vona et al [2011] model, using image analysis technique on BSE images collected after experiments, one can extract and characterize the crystal shapes from the input grey-scale slides, without considering the possible presence of nanometric crystals [Cassetta et al, 2023]. Procedures are described in Dellino and La Volpe [1996] and Loncaric [1998].…”

Section: Implications For Magma Dynamicsmentioning

confidence: 99%

Influence of volatiles (H 2 O and CO 2 ) on shoshonite phase equilibria

Vetere¹,

Namur²,

Holtz³

et al. 2023

Comptes Rendus. Géoscience

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Experiments were performed at 500 MPa, 1080 °C and water activities (aH 2 O) from 0.0 to 1.0, in fluid-present and fluid-absent conditions, with the aim of constraining the effect of volatiles on phase equilibrium assemblages of a shoshonite from Vulcanello (Aeolian Islands, Italy). Experiments were run both under reducing and oxidizing conditions and results show that proportions, shapes and size of crystals vary as a function of the volatile composition (X H 2 O and X CO 2 ) and volatile content. Clinopyroxene (Cpx) is the main crystallising phase and is compositionally analogous to Cpx crystals found in the natural rock. Plagioclase (Pl) is stable only for water activity lower than 0.1, whereas Fe-Ti oxides are present in all experimental runs, except for those where log f O 2 was lower than −9, (∆NNO −0.11) irrespective of the presence of CO 2 . The addition of CO 2 (2.8 wt%) in nominally dry experimental charges substantially reduces the crystallinity by ca. 1/3 compared to volatile free experiments. This result has important consequences upon the physical properties of the magma because it influences its viscosity and, as a consequence, velocity during its travel to the Earth surface.

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“…Additionally, it has been demonstrated that the analysis of the BP of silicate glasses can be used to estimate the melt properties since it embeds the detachment of the non-Arrhenian behavior of the liquid at the glass transition temperature (T g ) in the T g /T plot [25], i.e., melt fragility (m) [26]. In particular, by determining the BP maximum position (ω BP ) and T g of a glass, it is possible to build up its parental liquid's viscosity in function of temperature [27,28]. However, it represents the structural disorder of glass at the medium-range order (MRO) [29].…”

Section: Introductionmentioning

confidence: 99%

Medium-range structure modifications induced by Fe3+/Fetot. in volcanic glasses: a low-frequency Raman spectroscopy study

Cassetta

2024

Eur. Phys. J. Plus

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Here is carried out a Raman scattering study on the boson peak evolution of an iron-rich peralkaline rhyolite in function of both the iron oxidation state and the glass transition temperature. It is reported here that the distribution of low-frequency modes in the boson peak range is only slightly affected for an iron ratio (Fe3+/Fetot.) from 0.83 down to 0.24. Their distribution does not change in the boson peak range as a function of Fe3+/Fetot., until the reduction process starts to modify the glass network from a dominantly fourfold coordinated Fe3+ structures into a structure mostly governed by fivefold coordinated Fe2+. This trend is also related to a decreasing glass transition temperature peak, mirroring an increasing proportion of weakest bonds with respect to the stronger ones.

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Micro-Raman spectroscopy for a comprehensive understanding of the structural evolution of Basaltic-Andesite and Trachybasalt multiphase systems

Cited by 6 publications

References 76 publications

Viscosity, Boson Peak and Elastic Moduli in the Na2O-SiO2 System

Viscosity, Boson Peak and Elastic Moduli in the Na2O-SiO2 System

Influence of volatiles (H 2 O and CO 2 ) on shoshonite phase equilibria

Medium-range structure modifications induced by Fe3+/Fetot. in volcanic glasses: a low-frequency Raman spectroscopy study

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