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|Authors: ||Mollo, S.*|
|Title: ||Volcanic edifice weakening via devolatilization reactions|
|Title of journal: ||Geophysical Journal International|
|Series/Report no.: ||/186 (2011)|
|Issue Date: ||18-Mar-2011|
|Keywords: ||Phase transitions|
|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|
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