Crystallization Driven by Decompression and Water Loss at Stromboli Volcano (Aeolian Islands, Italy)

Métrich, Nicole; Bertagnini, A.; Landi, Patrizia; Rosi, Mauro

doi:10.1093/petrology/42.8.1471

Cited by 269 publications

(325 citation statements)

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“…Several recent papers have allowed improving the knowledge of the behaviour of the present-day magmatic system of Stromboli (e.g., Allard et al, 1994Allard et al, , 2010Francalanci et al, 1999Francalanci et al, , 2004Francalanci et al, , 2005Métrich et al, 2001Métrich et al, , 2005Métrich et al, , 2010Landi et al, 2004;Bertagnini et al, 1999Bertagnini et al, , 2008 and reference therein), but little is still known on the detailed processes controlling the change from the typical mild explosive activity to the more vigorous paroxysms and lava flow eruptions. In particular, previous works focussed on Sr isotope ratios and on micro-Sr isotope analyses have pointed out the importance of these data in understanding the dynamics of the present-day volcanic system of Stromboli, and the presence of complex mineral/liquid Sr-isotope disequilibria in products erupted between 1984 and 1996 AD (Francalanci et al, 1999.…”

Section: This Paper Reports the Results Of In-situmentioning

confidence: 99%

“…Instead, during major explosions and paroxysms, the most voluminous juvenile component still consists of black scoria similar in composition to those of the normal activity (HP-magma), but a second component consists of a highly-vesiculate light pumice, representing a volatile-rich magma with low phenocryst content (hereafter the "LP-magma") (Bonaccorso et al, 1996;Francalanci et al, 1999Francalanci et al, , 2004Bertagnini et al, 1999;Métrich et al, 2001). Black scoria and light pumices are usually mingled at different scales.…”

Section: General Backgroundmentioning

confidence: 99%

“…Minerals consist of olivine, clinopyroxene and plagioclase, with variable proportions in different samples (Rosi et al, 2000;Métrich et al, 2001;Francalanci et al, 2004). Euhedral crystals, in equilibrium with the glassy groundmass, are usually small (<0.5 mm), whereas the largest minerals crystallised from the HP-magmas (e.g., crystals in compositional equilibrium with and often surrounded by a more evolved glass than the pumice glassy groundmass) and were included into the LP-magma by syn-eruptive mingling processes .…”

Section: Petrochemical Backgroundmentioning

confidence: 99%

“…Single phenocrysts display strong (e.g., An 65-85 ) complex reverse or oscillatory zoning. Cores are often partially resorbed and have variable An contents (Métrich et al, 2001;Francalanci et al, 2004).…”

Section: Petrochemical Backgroundmentioning

confidence: 99%

“…These calculated pressures give a magma pond zone located at ~7-10 km depth (Métrich et al, 2001(Métrich et al, , 2005(Métrich et al, , 2010Bertagnini et al, 2003). The LP-magma reservoir is periodically recharged by a mafic Ca-rich magma with relatively low Sr isotope ratios (~0.70608) and containing CO 2 -rich gas phase Métrich et al, 2010).…”

Section: State Of the Art On The Dynamics And Plumbing System Of The mentioning

confidence: 99%

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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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Section: This Paper Reports the Results Of In-situmentioning

confidence: 99%

Section: General Backgroundmentioning

confidence: 99%

Section: Petrochemical Backgroundmentioning

confidence: 99%

Section: Petrochemical Backgroundmentioning

confidence: 99%

Section: State Of the Art On The Dynamics And Plumbing System Of The mentioning

confidence: 99%

See 3 more Smart Citations

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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On depressurization of volcanic magma reservoirs by passive degassing

et al. 2014

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Many active volcanoes around the world alternate episodes of unrest and mildly explosive eruptions with quiescent periods dominated by abundant but passive gas emissions. These are the so-called persistently degassing volcanoes, and well-known examples are Mayon (Philippines) and Etna (Italy). Here, we develop a new lumped-parameter model to investigate by how much the gas released during quiescence can decrease the pressure within persistently degassing volcanoes. Our model is driven by the gas fluxes measured with monitoring systems and takes into account the size of the conduit and reservoir, the viscoelastic response of the crust, the magma density change, the bubble exsolution and expansion at depth, and the hydraulic connectivity between reservoirs and deeper magma sources. A key new finding is that, for a vast majority of scenarios, passive degassing reduces the pressure of shallow magma reservoirs by several MPa in only a few months or years, that is, within the intereruptive timescales of persistently degassing volcanoes. Degassing-induced depressurization could be responsible for the subsidence observed at some volcanoes during quiescence (e.g., at Satsuma-Iwojima and Asama, in Japan; Masaya, in Nicaragua; and Llaima, in Chile), and could play a crucial role in the onset and development of the physical processes which may in turn culminate in new unrest episodes and eruptions. For example, degassing-induced depressurization could promote magma replenishment, induce massive and sudden gas exsolution at depth, and trigger the collapse of the crater floor and reservoir roof.

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Slug ascent and associated stresses during strombolian activity with non‐Newtonian rheology

Lieth

Hort

2016

JGR Solid Earth

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Strombolian activity is generally assumed to be driven by overpressurized gas slugs that rise through the magma‐filled volcanic conduit and burst at the surface. We develop an analytical model for this process that incorporates a generic, depth‐dependent, and non‐Newtonian magma rheology. Our model also describes the film draining after the burst and allows for the computation of the stresses exerted on the conduit walls using a new analytical solution for the thickness of an annular film flow. Using Stromboli volcano, Italy, as reference, it was evaluated with a specifically designed, non‐Newtonian rheological model based on petrochemical data. The results show the importance of using a realistic magma viscosity model when modeling the slug ascent: A 100 kg gas slug attains its maximum overpressure of 2.1 bars about 40 s before it rapidly expands and finally bursts at only 1.4 bars. This preburst pressure drop is not reproduced by constant viscosity models. The normal stresses on the conduit wall are generally dilatational above and adjacent to the slug and constrictive below it and after the burst. In both cases their maximum values exceed 3 bars, whereas the shear stresses stay negligible. Furthermore, it was found that the slug needs to start deeper than 25 m to build up its full burst pressure. At greater depth, the burst pressure decreases because of the adiabatic slug gas. Finally, a viscous plug at the top of the conduit is shown to increase the explosive potential of the volcano significantly.

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Crystallization Driven by Decompression and Water Loss at Stromboli Volcano (Aeolian Islands, Italy)

Cited by 269 publications

References 32 publications

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

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

On depressurization of volcanic magma reservoirs by passive degassing

Slug ascent and associated stresses during strombolian activity with non‐Newtonian rheology

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