Journal Article

Volcanic SiO2-cristobalite; a natural product of chemical vapor deposition

Conway, Chris, Saxey, David W, Rickard, William D. A, Castro, Jonathan M, Prior, David J, Lilly, Kat, Schipper, C. Ian, Reddy, Steven M, Fougerouse, Denis, Quadir, Zakaria

2020

Overview

Cristobalite is a low-pressure, high-temperature SiO2 polymorph that occurs as a metastable phase in many geologic settings, including as crystals deposited from vapor within the pores of volcanic rocks. Such vapor-phase cristobalite (VPC) has been inferred to result from silica redistribution by acidic volcanic gases but a precise mechanism for its formation has not been established. We address this by investigating the composition and structure of VPC deposited on plagioclase substrates within a rhyolite lava flow, at the micrometer to nanometer scale. The VPC contains impurities of the form [AlO4/Na+]0-coupled substitution of Al3+ charge-balanced by interstitial Na+-which are typical of cristobalite. However, new electron probe microanalysis (EPMA) element maps show individual crystals to have impurity concentrations that systematically decline from crystal cores-to-rims, and atom probe tomography reveals localized segregation of impurities to dislocations. Impurity concentrations are inversely correlated with degrees of crystallinity [observed by electron backscatter diffraction (EBSD), hyperspectral cathodoluminescence, laser Raman, and transmission electron microscopy (TEM)], such that crystal cores are poorly crystalline and rims are highly ordered tetragonal α-cristobalite. The VPC-plagioclase interfaces show evidence that dissolution-reprecipitation reactions between acidic gases and plagioclase crystals yield precursory amorphous SiO2 coatings that are suitable substrates for initial deposition of impure cristobalite. Successive layers of cubic β-cristobalite are deposited with impurity concentrations that decline as Al-bearing gases rapidly become unstable in the vapor cooling within pores. Final cooling to ambient temperature causes a displacive transformation from β→α cristobalite, but with locally expanded unit cells where impurities are abundant. We interpret this mechanism of VPC deposition to be a natural proxy for dopant-modulated Chemical Vapor Deposition, where halogen-rich acidic gases uptake silica, react with plagioclase surfaces to form suitable substrates and then deposit SiO2 as impure cristobalite. Our results have implications for volcanic hazards, as it has been established that the toxicity of crystalline silica is positively correlated with its purity. Furthermore, we note that VPC commonly goes unreported, but has been observed in silicic lavas of virtually all compositions and eruptive settings. We therefore suggest that despite being metastable at Earth's surface, cristobalite may be the most widely occurring SiO2 polymorph in extrusive volcanic rocks and a useful indicator of gas-solid reaction having occurred in cooling magma bodies.

• Publisher: Mineralogical Society of America,Walter de Gruyter GmbH
• Subject: Aluminum / Ambient temperature / atom probe / boundary interactions / Cardon Caulle / Cathodoluminescence / chemical composition / Chemical vapor deposition / Chile / Composition / Cooling / Cores / Cristobalite / Crystal structure / crystalline SiO / Crystallinity / Crystals / deposition / Earth surface / Electron backscatter diffraction / Electron microscopy / electron microscopy data / Electron probe / electron probe data / Electron probe microanalysis / framework silicates / gas solid reaction / Gas-solid reactions / gaseous phase / Gases / Geological hazards / glass corrosion / glasses / Halogens / High temperature / igneous rocks / Impurities / Interfaces / Lasers / lattice parameters / Lava / Lava flows / Low pressure / Magma / major elements / Metastable phases / Mineralogy / minor elements / Natural products / Plagioclase / Pores / precipitation / Rhyolite / Rhyolites / Rims / Rocks / Segregation / SEM data / Silica / silica minerals / silicates / Silicon dioxide / solid phase / South America / Substrates / Temperature / Tomography / Toxic hazards / Toxicity / trace elements / Transmission electron microscopy / Uptake / vapor phase mineralization / Vapors / Volcanic gases / volcanic risk / Volcanic rocks / volcanoes / water vapor