The role of gas percolation in quiescent degassing of persistently active basaltic volcanoes

Burton, Mike; Mader, Heidy M; Polacci, Margherita

doi:10.1016/j.epsl.2007.08.028

Cited by 151 publications

(127 citation statements)

References 55 publications

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“…The so-called "excess degassing" (Shinohara, 2008), the fact that basaltic volcanoes no doubt emit more gas than potentially contributed by erupted magma, implies an effective gas bubble-melt separation at some point during the ascent. However, while it is universally accepted that separate gas transfer exerts a key control on both quiescent (Burton et al, 2007a) and eruptive (Edmonds and Gerlach, 2007) degassing of basaltic volcanoes, the mechanisms (structural vs. fluid-dynamic control) and depths (shallow vs. deep) of such gas separation are still not entirely understood (Edmonds, 2008). …”

Section: Introductionmentioning

confidence: 99%

A model of degassing for Stromboli volcano

Aiuppa¹,

Bertagnini²,

Métrich³

et al. 2010

Earth and Planetary Science Letters

150

137

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A better understanding of degassing processes at open-vent basaltic volcanoes requires collection of new datasets of H 2 O-CO 2 -SO 2 volcanic gas plume compositions, which acquisition has long been hampered by technical limitations. Here, we use the MultiGAS technique to provide the best-documented record of gas plume discharges from Stromboli volcano to date. We show that Stromboli's gases are dominated by H 2 O (48-98 mol%; mean, 80%), and by CO 2 (2-50 mol%; mean, 17%) and SO 2 (0.2-14 mol%; mean, 3%). The significant temporal variability in our dataset reflects the dynamic nature of degassing process during Strombolian activity; which we explore by interpreting our gas measurements in tandem with the melt inclusion record of pre-eruptive dissolved volatile abundances, and with the results of an equilibrium saturation model. Comparison between natural (volcanic gas and melt inclusion) and modelled compositions is used to propose a degassing mechanism for Stromboli volcano, which suggests surface gas discharges are mixtures of CO 2 -rich gas bubbles supplied from the deep (N4 km) plumbing system, and gases released from degassing of dissolved volatiles in the magma filling the upper conduits. The proposed mixing mechanism offers a viable and general model to account for composition of gas discharges at all volcanoes for which petrologic evidence of CO 2 fluxing exists. A combined volcanic gas-melt inclusion-modelling approach, as used in this paper, provides key constraints on degassing processes, and should thus be pursued further.

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Section: Introductionmentioning

confidence: 99%

A model of degassing for Stromboli volcano

Aiuppa¹,

Bertagnini²,

Métrich³

et al. 2010

Earth and Planetary Science Letters

150

137

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“…This suggests they are recycled by the dynamic processes of the Strombolian activity, which appear to be particularly efficient in recycling crystals considering the high percentage content of these high Sr-isotope antecrysts. On the other hand, whatever the conceptual model of the volcano is proposed, it is nowadays believed that the periodic mild Strombolian explosions leave in the conduit a degassed dense HP-magma descending downwards possibly along the conduit walls (Chouet et al, 2003;Colò et al, 2010;Lautze and Houghton, 2007;Burton et al, 2007;Fornaciai et al, 2009;Metrich et al, 2010). This mechanism leads minerals (with possibly degassed silicate melt) to be also recycled from the upper part of the plumbing system into the HP-magma reservoir.…”

Section: Dynamics Of the Crystal Recyclingmentioning

confidence: 99%

Crystal recycling in the steady-state system of the active Stromboli volcano: a 2.5-ka story inferred from in situ Sr-isotope and trace element data

Francalanci

Avanzinelli

Nardini

et al. 2011

Contrib Mineral Petrol

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The nal publication is available at Springer via http://dx.doi.org/10.1007/s00410-011-0661-0Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. 3 Abstract In-situ

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“…These two conditions promote efficient vesicle coalescence and vesicle deformation to form a continuous pathway for gas to flow out of the system quiescently in both silicic (Okumura et al, 2009) and mafic (Burton et al, 2007) magmas. The centre and the region between the centre and conduit walls are also affected by magma degassing, although to a potentially minor extent, which recent experimental studies on rhyolitic obsidian have indicated as the mandatory requirement to trigger explosivity during a volcanic eruption (Okumura et al, 2013).…”

Section: Insights Into Conduit Degassingmentioning

confidence: 99%

“…It is a key parameter in the transition from effusive to explosive volcanism (Eichelberger et al, 1986;Jaupart and Allegre, 1991;Woods and Koyaguchi, 1994;Kozono and Koyaguchi, 2009a,b;Degruyter et al, 2012), for example in the catastrophic failure from dome-forming eruptions to Vulcanian/Plinian behaviour (Lipman and Mullineaux, 1981;Herd et al, 2005). Permeability is also responsible for the quiescent gas loss from persistently degassing volcanoes (Oppenheimer et al, 2003), through formation of networks of continuously connected vesicles , where gas percolates and can exit the volcanic system non-explosively (Burton et al, 2007). Quantifying permeability is therefore important for assessing the contribution of magmatic gases to the atmospheric global volatile budget (Gerlach, 2011).…”

Section: Introductionmentioning

confidence: 99%

Permeability measurements of Campi Flegrei pyroclastic products: An example from the Campanian Ignimbrite and Monte Nuovo eruptions

Polacci

Maisonneuve

Giordano

et al. 2014

Journal of Volcanology and Geothermal Research

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In order to understand outgassing during volcanic eruptions, we performed permeability measurements on trachy-phonolitic pyroclastic products from the Campanian Ignimbrite and Monte Nuovo, two explosive eruptions from the active Campi Flegrei caldera, Southern Italy. Viscous (Darcian) permeability spans a wide range between 1.22 × 10 −14 and 9.31 × 10 −11 m 2 . Inertial (non-Darcian) permeability follows the same trend as viscous permeability: it increases as viscous permeability increases, highlighting the strong direct correlation between these two parameters. We observe that vesicularity does not exert a first order control on permeability: the Monte Nuovo scoria clasts are the most permeable samples but not the most vesicular; pumice clasts from the Campanian Ignimbrite proximal facies, whose vesicularity is comparable with that of Monte Nuovo scoriae, are instead the least permeable. In addition, we find that sample geometry exhibits permeability anisotropy as samples oriented parallel to vesicle elongation are more permeable than those oriented perpendicular. We compare our results with permeability values of volcanic products from effusive and explosive activity, and discuss the role of melt viscosity and crystallinity on magma permeability.

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The role of gas percolation in quiescent degassing of persistently active basaltic volcanoes

Cited by 151 publications

References 55 publications

A model of degassing for Stromboli volcano

A model of degassing for Stromboli volcano

Crystal recycling in the steady-state system of the active Stromboli volcano: a 2.5-ka story inferred from in situ Sr-isotope and trace element data

Permeability measurements of Campi Flegrei pyroclastic products: An example from the Campanian Ignimbrite and Monte Nuovo eruptions

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