Viscosity of Pyroxenite Melt and Its Evolution During Cooling

Vetere, Francesco; Murri, Mara; Alvaro, Matteo; Domeneghetti, M. Chiara; Rossi, Stefano; Pisello, Alessandro; Perugini, Diego; Holtz, François

doi:10.1029/2018je005851

Cited by 30 publications

(31 citation statements)

References 84 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These elements are known as network former cations (hereafter, T), whereas other cations, which are not 4-coordinated with oxygen, are called network modifiers 50 . The behavior of alkali elements (Na and K) in relationship with Al and Fe 2+ /Fe tot determines important structural features of glasses: alkalis may act as network balancers for Al and Fe, so that the tetrahedrical structure is not interrupted and T-O bonds become longer 15,16,51 . Since alkalis have such an important influence on the structure, we have chosen to investigate series with substantial difference in alkali content (Table 1).…”

Section: Discussionmentioning

confidence: 99%

“…Consequently, existing models cannot be automatically extrapolated to formulate high-resolution hypotheses, especially when volcanic activities are frequent and widespread. In fact, effusive and explosive volcanism extensively occurred on rocky planets and satellites (Mercury, Moon, Mars, Io, Vesta), covering huge areas of their surfaces and shaping peculiar morphology 14,15 . Therefore, the study of the chemical composition of extraterrestrial volcanism is of great importance to infer the geological history of Solar System rocky bodies, only if non-crystalline fractions are correctly accounted.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Retrieving magma composition from TIR spectra: implications for terrestrial planets investigations

Pisello

Vetere

Bisolfati

et al. 2019

Sci Rep

View full text Add to dashboard Cite

Emissivity and reflectance spectra have been investigated on two series of silicate glasses, having compositions belonging to alkaline and subalkaline series, covering the most common terrestrial igneous rocks. Glasses were synthesized starting from natural end-members outcropping at Vulcano Island (Aeolian Islands, Italy) and on Snake River Plain (USA). Results show that the shift of the spectra, by taking Christiansen feature (CF) as a reference point, is correlated with SiO2 content, the SCFM factor and/or the degree of polymerization state via the NBO/T and temperature. The more evolved is the composition, the more polymerized the structure, the shorter the wavelength at which CF is observable. CF shift is also dependent on temperature. The shape of the spectra discriminates alkaline character, and it is related to the evolution of Qn structural units. Vulcano alkaline series show larger amount of Q4 and Q3 species even for mafic samples compared to the subalkaline Snake River Plain series. Our results provide new and robust insights for the geochemical characterization of volcanic rocks by remote sensing, with the outlook to infer origin of magmas both on Earth as well as on terrestrial planets or rocky bodies, from emissivity and reflectance spectra.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Retrieving magma composition from TIR spectra: implications for terrestrial planets investigations

Pisello

Vetere

Bisolfati

et al. 2019

Sci Rep

View full text Add to dashboard Cite

show abstract

“…To date, data straddling these critical transition zones under non-isothermal conditions are, however, scarce. Measurements at disequilibrium conditions, employing new experimental methods (Giordano et al, 2007;Kolzenburg et al, 2017Kolzenburg et al, , 2018aVetere et al, 2019) and infrastructure (Kolzenburg et al, 2016(Kolzenburg et al, , 2018b have only recently become more numerous. This underlines the relevance of developing a comprehensive database of the temperature dependent rheology of crystallizing magmas and lavas in dynamic temperature-, shear-rate-, and oxygen fugacity (fO 2 ) -space to accurately constrain physical property based lava flow and magma mixing models.…”

Section: General Overviewmentioning

confidence: 99%

Disequilibrium Rheology and Crystallization Kinetics of Basalts and Implications for the Phlegrean Volcanic District

et al. 2020

View full text Add to dashboard Cite

Large volcanic eruptions are frequently triggered by the intrusion of hot primitive magma into a more evolved magma-chamber or-mush zone. During intrusion into the cooler mush zone, the basaltic magma undergoes crystallization, which in turn can release heat and volatiles to the mush. This should cause a drop in bulk mush-viscosity, potentially leading to its mobilization and even eruption. The non-linear changes in the transport properties of both magmas during this interaction also modulate how the magmas accommodate deformation during both interaction and ascent. As such, this interaction represents a complex disequilibrium phenomenon, during which the material properties guiding the processes (dominantly viscosity) are in constant evolution. This scenario highlights the importance of non-isothermal sub-liquidus processes for the understanding of natural magmatic and volcanic systems and underlines the need for a rheological database to inform on, and to model, this interaction process. Here we present new experimental data on the disequilibrium rheology of the least evolved end-member known to be involved in magma mixing and eruption triggering as well as lava flow processes in the Phlegrean volcanic district (PVD). We measure the melt's subliquidus rheological evolution as a function of oxygen fugacity and cooling rate and map systematic shifts in its rheological "cut off temperature; T cutoff " (i.e., the point where flow ceases). The data show that (1) the rheological evolution and solidification behavior both depend on the imposed cooling-rate, (2) decreasing oxygen fugacity decreases the temperature at which the crystallization onset occurs and modifies the kinetics of melt crystallization and (3) the crystallization kinetics produced under dynamic cooling are significantly different than those observed at or near equilibrium conditions. Based on the experimental data we derive empirical relationships between the environmental parameters and T cutoff. These empirical descriptions of solidification and flow may be employed in numerical models aiming to model lava flow emplacement or to reconstruct the thermomechanical interaction between basalts and magma mush systems. We further use the experimental data in concert with existing models of particle suspension rheology to derive the disequilibrium crystallization kinetics of the melt and its transition from crystallization to glass formation.

show abstract

“…The response of magma to this deformation is a function of intensive parameters (e.g., melt composition, crystal and bubble fraction) and extensive conditions (temperature, pressure) and has been widely studied (e.g., Shaw et al, 1968;Spera et al, 1988;Pinkerton and Stevenson, 1992;Caricchi et al, 2007;Cordonnier et al, 2009;Pistone et al, 2012). On the way to the surface, magmatic liquids also undergo textural and structural changes generated by depressurization, cooling and changes in oxygen fugacity leading to disequilibrium rheology (e.g., Giordano et al, 2007;Kolzenburg et al, 2016Kolzenburg et al, , 2017Kolzenburg et al, , 2018aVetere et al, 2019) and crystallization (e.g., Arzilli and Carroll, 2013;Vetere et al, 2013Vetere et al, , 2015. Crystals and bubbles thus nucleate and grow in a magma that experiences a range of temperatures, pressures and strain-rates.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Deformation on the Early Crystallization Kinetics of Basaltic Magmas

et al. 2019

View full text Add to dashboard Cite

Crystals and bubbles nucleate and grow in a magma that experiences a range of temperatures, pressures and strain-rates. We have a good conceptual and sometimes quantitative understanding of how crystallization and bubble nucleation are controlled by decompression and cooling. Here we explore the effect of strainrate on the crystallization kinetics of magmas. In order to understand the interaction between deformation and crystallization, samples of basalt were deformed during their crystallization. We made measurements at subliquidus conditions (1160 • C) and deformed samples in compression at strain-rates varying from 0 to 2 × 10 −4 s −1 for a total strain of 0.31. We simultaneously imaged the samples using X-ray microtomography. Without deformation, no crystallization was observed over the course of a 260 min experiment. Once deformation was applied, crystallization initiated. Deformation increased the nucleation rate, increased crystal growth rates, and decreased the incubation time. Increasing the strain-rate, however, does not show a discernable effect of crystallization kinetics. We hypothesize that deformation may have an effect on the parameters that govern the crystallization kinetics of magmas, such as activation energy and diffusion by changing chemical potentials.

show abstract

Viscosity of Pyroxenite Melt and Its Evolution During Cooling

Cited by 30 publications

References 84 publications

Retrieving magma composition from TIR spectra: implications for terrestrial planets investigations

Retrieving magma composition from TIR spectra: implications for terrestrial planets investigations

Disequilibrium Rheology and Crystallization Kinetics of Basalts and Implications for the Phlegrean Volcanic District

The Effects of Deformation on the Early Crystallization Kinetics of Basaltic Magmas

Contact Info

Product

Resources

About