Delmelle, Pierre
[UCL]
Wadsworth Fabian B.
[Ludwig-Maximillians University, Munich, Germany]
Maters Elena C.
[University of Leeds, UK]
Ayris Paul M.
[Ludwig-Maximillians University, Munich, Germany]
The common manifestation of an explosive volcanic eruption is the emission of a hot mixture of solid fragments and expanding magmatic gases, referred to as the eruption plume, into the atmosphere (Fig. 1, Sparks et al. 1997; Carey and Bursik 2015). Ash (the rock particles less than two millimeters across) usually dominates the plume’s solid load, whereas water vapor followed by CO2 and lesser amounts of sulfur and halogen species constitute the eruptive gas phase. Plumes can initially travel as a jet with velocities up to 600 ms−1, temperatures above 800 °C and densities of a few kgm−3; reaching five to ten times the density of the ambient air. However, rapid cooling and dilution of the ash and gas occurs when the plume entrains and heats the surrounding air, generating buoyancy and uplift. Thus, eruption plumes are characterized by strong temperature, chemical and density gradients, offering ample opportunities for heterogeneous reactions between volcanic gases and ash particles.
Bibliographic reference |
Delmelle, Pierre ; Wadsworth Fabian B. ; Maters Elena C. ; Ayris Paul M. . High Temperature Reactions Between Gas and Ash Particles in Volcanic Eruption Plumes. In: Reviews in Mineralogy and Geochemistry, , no.84, p. 285-308 (2018) |
Permanent URL |
http://hdl.handle.net/2078.1/203890 |