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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/7244

Authors: Mollo, S.*
Vinciguerra, S.*
Iezzi, G.*
Iarocci, A.*
Scarlato, P.*
Heap, M.*
Dingwell, D.*
Title: Volcanic edifice weakening via devolatilization reactions
Title of journal: Geophysical Journal International
Series/Report no.: /186 (2011)
Publisher: Wiley-Blackwell
Issue Date: 18-Mar-2011
DOI: 10.1111/j.1365-246X.2011.05097.x
Keywords: Phase transitions
Experimental volcanism
Abstract: Edifice instability, that can result in catastrophic flank collapse, is a fundamental volcanic hazard. The subvolcanic basement can encourage such instability, especially if it is susceptible to mechanical weakening by devolatilization reactions near magmatic temperatures. For this reason, understanding how the physical and chemical properties of representative lithologies deteriorate at high temperatures is potentially highly relevant for volcanic hazard mitigation. This is particularly true for sedimentary rock, commonly found underlying volcanic edifices worldwide, that undergo rapid deterioration even under modest temperatures. Therefore, here we present the first experimental study of devolatilization reactions, induced by magmatic temperatures, on sedimentary rock comprising a subvolcanic basement. Our results show that, for a marly limestone representative of the basement at Mt Etna, devolatilization reactions, namely the dehydroxylation of clay minerals and the decarbonation of calcium carbonate, result in a dramatic reduction of mechanical strength and seismic velocities. These temperature-driven reactions can promote volcanic instability at stresses much lower than previously estimated.
Appears in Collections:04.01.04. Mineral physics and properties of rocks
Papers Published / Papers in press

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