Magma Chamber Dynamics at the Campi Flegrei Caldera, Italy

Montagna, Chiara Paola; Papale, Paolo; Longo, Antonella

doi:10.1007/978-3-642-37060-1_7

Cited by 4 publications

(2 citation statements)

References 80 publications

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“…(Longo, Barsanti, et al, 2012;C. Montagna et al, 2015;Papale et al, 2017; C. P. Montagna et al, 2022). To keep the computational efforts to within manageable size, the temperature is taken constant (1300 K) throughout the computational domain, and crystallization is neglected (see Discussion).…”

Section: Methodsmentioning

confidence: 99%

Dynamics of magma chamber replenishment under buoyancy and pressure forces

Longo

Garg

Papale

et al. 2022

Preprint

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Active magma chambers are periodically replenished upon a combination of buoyancy and pressure forces driving upward motion of initially deep magma. Such periodic replenishments concur to determine the chemical evolution of shallow magmas, they are often associated to volcanic unrests, and they are nearly ubiquitously found to shortly precede a volcanic eruption. Here we numerically simulate the dynamics of shallow magma chamber replenishment by systematically investigating the roles of buoyancy and pressure forces, from pure buoyancy to pure pressure conditions and across combinations of them. Our numerical results refer to volcanic systems that are not frequently erupting, for which magma at shallow level is isolated from the surface (â\eurooeclosed conduitâ\euro? volcanoes). The results depict a variety of dynamic evolutions, with the pure buoyant endmember associated with effective convection and mixing and generation of no or negative overpressure in the shallow chamber, and the pure pressure end-member translating into effective shallow pressure increase without any dynamics of magma convection associated. Mixed conditions with variable extents of buoyancy and pressure forces illustrate dynamics initially dominated by overpressure, then, over the longer term, by buoyancy forces. Results globally suggest that many shallow magmatic systems may evolve during their lifetime under the control of buoyancy forces, likely triggered by shallow magma degassing. That naturally leads to long-term stable dynamic conditions characterized by periodic replenishments of partially degassed, heavier magma by volatile-rich fresh deep magma, similar to those reconstructed from petrology of many shallow-emplaced magmatic bodies.

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Section: Methodsmentioning

confidence: 99%

Dynamics of magma chamber replenishment under buoyancy and pressure forces

Longo

Garg

Papale

et al. 2022

Preprint

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“…Partition between the liquid and gas phases is computed with the nonideal multicomponent saturation model SOLWCAD (Papale et al, 2006) as a function of space and time and depends on local composition, pressure, and temperature. Density and viscosity are calculated accordingly (Longo, Barsanti, et al, 2012;Montagna et al, 2015Montagna et al, , 2022Papale et al, 2017). The SOLWCAD model allows to realistically reproduce volatile saturation, including the reciprocal effect of different volatile species (H 2 O and CO 2 ) in affecting their dissolved amounts.…”

Section: Numerical Modelmentioning

confidence: 99%

Dynamics of Magma Chamber Replenishment Under Buoyancy and Pressure Forces

et al. 2023

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A multi-methodological approach to record dynamics and timescales of the plumbing system of Zaro (Ischia Island, Italy)

Pelullo,

Chakraborty,

Montagna

et al. 2024

Contrib Mineral Petrol

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Determining the time spans of processes related to the assembly of eruptible magma at active volcanoes is fundamental to understand magma chamber dynamics and assess volcanic hazard. This information can be recorded in the chemical zoning of crystals. Nevertheless, this kind of study is still poorly employed for the active volcanoes of the Neapolitan area (Southern Italy), in particular, for Ischia island where the risk is extremely high and this information can provide the basis for probabilistic volcanic hazard assessment. For these reasons, we acquired chemical composition on clinopyroxene crystals erupted at Ischia during the Zaro eruption (6.6 ± 2.2 ka) and performed numerical simulations of the input of mafic magma into a trachytic reservoir, in order to investigate various aspects of pre-eruptive dynamics occurring at different timescales. This event emplaced a ~ 0.1 km3 lava complex, in which the main trachytic lava flows host abundant mafic to felsic enclaves. Previous petrological investigation suggested that mafic magma(s) mixed/mingled with a trachytic one, before the eruption. In this work, the clinopyroxene zoning patterns depict the growth of crystals in different magmatic environments, recording sequential changes occurred in the plumbing system before the eruption. The evolution of the plumbing system involved a hierarchy of timescales: a few hours for magma mingling caused by mafic recharge(s) and likely occurred multiple times over a decade during which a dominant magmatic environment was sustained before the eruption. Such timescales must be considered in volcanic hazard assessment at Ischia and similar active volcanoes in densely populated areas.

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Magma Chamber Dynamics at the Campi Flegrei Caldera, Italy

Cited by 4 publications

References 80 publications

Dynamics of magma chamber replenishment under buoyancy and pressure forces

Dynamics of magma chamber replenishment under buoyancy and pressure forces

Dynamics of Magma Chamber Replenishment Under Buoyancy and Pressure Forces

A multi-methodological approach to record dynamics and timescales of the plumbing system of Zaro (Ischia Island, Italy)

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