Quantitative model for magma degassing and ground deformation (bradyseism) at Campi Flegrei, Italy: Implications for future eruptions

Bodnar, Robert J.; Cannatelli, Claudia; Vivo, Benedetto De; Lima, Annamaria; Belkin, Harvey E.; Milia, Alfonsa

doi:10.1130/g23653a.1

Cited by 80 publications

(61 citation statements)

References 15 publications

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“…This interpretation is consistent with thermodynamic modelling of magma evolution (Fig. 4), and with interpretations of ongoing patterns of degassing and deformation in Campi Flegrei, which can be explained by local volatile saturation at the roof of a largely H 2 Oundersaturated magma chamber 40 . We observe a measurable decrease in apatite X halogen /X OH between biotite-hosted inclusions and microphenocrysts, indicating continued crystallization and an increase in melt H 2 O concentration after biotite-in.…”

Section: Pre-eruptive Volatile Undersaturation At Campi Flegreisupporting

confidence: 74%

Late-stage volatile saturation as a potential trigger for explosive volcanic eruptions

et al. 2016

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. (2016) 'Late-stage volatile saturation as a potential trigger for explosive volcanic eruptions.', Nature geoscience., 9 (3). pp. 249-254. Further information on publisher's website:http://dx.doi.org/10.1038/NGEO2639Publisher's copyright statement:Additional 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. Volatile variations in apatite and hydrous glassesThe volatile composition of apatite relates to that of its host liquid by a set of exchange reactions between F, Cl and OH, for example:where exchange coefficients, K, are constant at a given pressure (P) and temperature (T) (ref. 12), f is fugacity, X is mole fraction and superscripts l and Ap denote the liquid and apatite phases, respectively. We measured F, Cl and OH directly using secondary ion mass spectrometry and electron microprobe analysis (see Supplementary Methods). We neglect 4 sulphur, because S diffusion in apatite is inhibited by a coupled substitution 19 , and equilibrium is not maintained on short timescales. Apatite compositions from Astroni 1 show a negative correlation between X F and X OH and a weaker negative correlation between X Cl and X OH (where X F , X Cl and X OH are the mole fractions of F, Cl and OH, respectively;Supplementary Table 1), demonstrating this exchange of components within the crystal volatile site. Some crystals are slightly non-stoichiometric, within the range reported in other studies 20 . We focus on mole fraction ratios as these relate to liquid composition, pressure and temperature through relationships such as equation (1). Data show a positive correlation between X Cl /X OH and X F /X OH ( Fig. 2a), with one low-X Cl , high-X F outlier. In general, X F /X Cl is constant within error, except in the outlier which has high X F /X Cl ( Fig. 2b). Clinopyroxenehosted apatite inclusions extend to higher X halogen /X OH ratios than biotite-hosted apatite inclusions. Both clinopyroxene-and biotite-hosted inclusions extend to higher X halogen /X OH ratios than apatite microphenocrysts that were in contact with melt until eruption. The overall X halogen /X OH trend is apparently linear, suggesting that there was no significant relative change in F or Cl compatibility during apatite crystallization. (Fig. 3a-c). However, matrix glasses have low H 2 O contents relative to both clinopyroxene-and biotite-hosted melt inclusions, typically <1 wt% (Fig. 3d). Modelling fractionation and volatile saturationWe model magma evolution in the Campi Flegrei system using the Rhyolite-MELTS thermodynamic software 23,24, 25,26 Disc...

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Section: Pre-eruptive Volatile Undersaturation At Campi Flegreisupporting

confidence: 74%

Late-stage volatile saturation as a potential trigger for explosive volcanic eruptions

et al. 2016

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“…Within this zone, fluid pressures transition from hydrostatic to lithostatic as rock permeability becomes severely reduced (Fournier 1999). When this region is subjected to high strain rates, fracturing may occur, leading to episodic influxes of mass and heat to the hydrothermal system (Bodnar et al 2007). While agreement exists on the definition of lower limit of a volcanic hydrological system, the same is not true for the upper limit.…”

Section: Hydrothermal Systemmentioning

confidence: 85%

Groundwater flow and volcanic unrest

Jasim

Hemmings

Mayer

et al. 2018

Advances in Volcanology

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Hydrology around active volcanoes is strongly controlled by the interaction between groundwater, and the fluids, dissolved elements and heat associated with magmatic intrusion. The chemical and mechanical processes associated with magmatic unrest can result in observable changes in the hydrothermal system. Consequently, observations of chemical and physical hydrothermal variations may provide insights into the state of volcanic activity. Additionally, the interaction between hydrological and volcanic systems leads to the presence of high-temperature, pressurised, and often acidic fluids, which add to, and intensify, the volcanic hazard. In the following chapter we present the major components of, and controls on, magmatic hydrothermal systems focusing on the mutual perturbation between the groundwater flow system and the volcanic system. We explore how these conditions can be modified by volcanic unrest and we identify feedbacks between dynamic hydrothermal behaviour and on-going unrest. The interaction between these systems, and therefore the associated monitoring signals, are the result of complex groundwater-volcano coupling within multi-phase flow system in evolving lithologies. Nonetheless, detailed monitoring of hydrothermal and hydrological behaviour can provide insights into unrest and the evolution of hazards at restless volcanoes.

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“…and by remnants of industrial production, probably responsible for the observed magnetic anomalies. As an alternative hypothesis, the hydrothermal activity associated to the volcanic activity in the active volcanic area of the Phlegrean Fields should have been responsible for supplying in the environment of a large amount of metallic elements, causing the magnetic anomalies (Bodnar et al 2007;De Vivo et al 2008).…”

Section: Marine Magnetics Of the Gulf Of Pozzuolimentioning

confidence: 99%

“…A correlation with the terrestrial geology of the Phlegrean Fields has been attempted in order to highlight tectonic and magmatic implications in the geological evolution of the Phlegrean Fields volcanic complex, intensively studied through field geology (Morhange et al 2005;Bellucci et al 2006;De Natale et al 2007;Bodnar et al 2007). …”

Section: Introductionmentioning

confidence: 99%

“…Alternative models have been proposed (De Vivo and Lima 2006;De Vivo et al 2007;Bodnar et al 2007), explaining the bradyseism according to a new hydrothermal model, based on the analogy between the mineralized systems of ''porphyry'' type (Burnham 1979;Fournier 1999) and the geothermal system of Phlegrean Fields. The fluid inclusions entrapped in the crystals of the Phlegrean rocks show the occurrence of different mineral phases, which cannot be mixed, during the magmatic evolution of the volcanic complex.…”

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confidence: 99%

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New seismo-stratigraphic and marine magnetic data of the Gulf of Pozzuoli (Naples Bay, Tyrrhenian Sea, Italy): inferences for the tectonic and magmatic events of the Phlegrean Fields volcanic complex (Campania)

2012

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A detailed reconstruction of the stratigraphic and tectonic setting of the Gulf of Pozzuoli (Naples Bay) is provided on the basis of newly acquired single channel seismic profiles coupled with already recorded marine magnetics gathering the volcanic nature of some seismic units. Inferences for the tectonic and magmatic setting of the Phlegrean Fields volcanic complex, a volcanic district surrounding the western part of the Gulf of Naples, where volcanism has been active since at least 50 ka, are also discussed. The Gulf of Pozzuoli represents the submerged border of the Phlegrean caldera, resulting from the volcano-tectonic collapse induced from the pyroclastic flow deposits of the Campanian Ignimbrite (35 ka). Several morpho-depositional units have been identified, i.e., the inner continental shelf, the central basin, the submerged volcanic banks and the outer continental shelf. The stratigraphic relationships between the Quaternary volcanic units related to the offshore caldera border and the overlying deposits of the Late Quaternary depositional sequence in the Gulf of Pozzuoli have been highlighted. Fourteen main seismic units, both volcanic and sedimentary, tectonically controlled due to contemporaneous folding and normal faulting have been revealed by geological interpretation. Volcanic dykes, characterized by acoustically transparent sub-vertical bodies, locally bounded by normal faults, testify to the magma uprising in correspondence with extensional structures. A large field of tuff cones interlayered with marine deposits off the island of Nisida, on the western rim of the gulf, is related to the emplacement of the Neapolitan Yellow Tuff deposits. A thick volcanic unit, exposed over a large area off the Capo Miseno volcanic edifice is connected with the Bacoli-Isola Pennata-Capo Miseno yellow tuffs, cropping out in the northern Phlegrean Fields.

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Quantitative model for magma degassing and ground deformation (bradyseism) at Campi Flegrei, Italy: Implications for future eruptions

Cited by 80 publications

References 15 publications

Late-stage volatile saturation as a potential trigger for explosive volcanic eruptions

Late-stage volatile saturation as a potential trigger for explosive volcanic eruptions

Groundwater flow and volcanic unrest

New seismo-stratigraphic and marine magnetic data of the Gulf of Pozzuoli (Naples Bay, Tyrrhenian Sea, Italy): inferences for the tectonic and magmatic events of the Phlegrean Fields volcanic complex (Campania)

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