2008
DOI: 10.1029/2007jb005130
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A model for episodic degassing of an andesitic magma intrusion

Abstract: [1] Episodic magmatic degassing has been observed at numerous volcanoes, especially those of intermediate composition. It can span timescales from years to decades. Here we propose a physical model for the degassing of a shallow magma intrusion to explain this phenomenon. The magma cools by convection, which leads to melt crystallization, volatile exsolution, and magma overpressure. When the pressure reaches a critical value, wall rocks fracture and the exsolved gas escapes. The intrusion then returns to the i… Show more

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Cited by 24 publications
(48 citation statements)
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“…1). The last 1976-1977 eruption has been interpreted as a stillborn or failed magmatic eruption (Feuillard et al 1983;Komorowski et al 2005;Villemant et al 2005;Boichu et al 2008Boichu et al , 2011 linked to the intrusion of a small volume of viscous andesitic magma that stopped within a few kilometres of the surface triggering pressurization of the hydrothermal system, phreatic explosions and continuing episodic chlorine degassing into the hydrothermal system (Villemant et al 2005).…”
Section: La Soufriè R E E Ru P T I V E H I S T O Ry a N D H A Z A R D Smentioning
confidence: 99%
“…1). The last 1976-1977 eruption has been interpreted as a stillborn or failed magmatic eruption (Feuillard et al 1983;Komorowski et al 2005;Villemant et al 2005;Boichu et al 2008Boichu et al , 2011 linked to the intrusion of a small volume of viscous andesitic magma that stopped within a few kilometres of the surface triggering pressurization of the hydrothermal system, phreatic explosions and continuing episodic chlorine degassing into the hydrothermal system (Villemant et al 2005).…”
Section: La Soufriè R E E Ru P T I V E H I S T O Ry a N D H A Z A R D Smentioning
confidence: 99%
“…While the physical model of the cycle of magma cooling, crystallization, and degassing has been previously developed and is correlated to the time series of Cl observed at springs, the transport process of the volatiles between the starting point, magma, and the ending point, spring, is less well known (Boichu et al, 2008;Boichu et al, 2011;Villemant et al, 2005). The chloride time series records episodic degassing events, with lag times consistent with measured spring flow rates.…”
Section: Discussionmentioning
confidence: 99%
“…Within the eruptive conduit ( Figure 1c), high-temperature gas and vapor emission occurs in pulses and is related to a two-step magma degassing process characterized by the initial rapid release of HCl-rich H 2 O vapor during emplacement of new magma, followed by protracted release of gases and vapor at diminishing rates during crystallization of the newly emplaced magma (Boichu et al, 2008). Within the eruptive conduit ( Figure 1c), high-temperature gas and vapor emission occurs in pulses and is related to a two-step magma degassing process characterized by the initial rapid release of HCl-rich H 2 O vapor during emplacement of new magma, followed by protracted release of gases and vapor at diminishing rates during crystallization of the newly emplaced magma (Boichu et al, 2008).…”
Section: Geological Settingmentioning
confidence: 99%
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“…The surrounding rock failure criteria also depend on the exsolved fluid composition (Tait et al 1989). The occurrence of a two-phase fluid in Vesuvius reservoir may significantly increase its value (Boichu et al 2008). …”
Section: Eruption Modelmentioning
confidence: 98%