3D electrical imaging of the inner structure of a complex lava dome, Puy de Dôme volcano (French Massif Central, France)

Portal, Angélie; Fargier, Yannick; Labazuy, Philippe; Lénat, Jean‐François; Boivin, Pierre; Miallier, Didier

doi:10.1016/j.jvolgeores.2019.01.019

Cited by 13 publications

(10 citation statements)

References 30 publications

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“…Their role is confirmed by geochemical data. This is also consistent with geophysical data indicating that the dome core is significantly altered (Portal et al, 2019). Finally, fumarolic activity accounts fairly well for the development of a specific geochemical signature among samples belonging to the various trachytic groups and devoid (except CR samples) of any obvious petrological and mineralogical alteration of their pristine signature.…”

Section: Fumarolic Activitysupporting

confidence: 87%

“…After the PdD eruption (11.0 ± 0.2 ka), fumarolic activity persisted, probably involving groundwaters and PdD hydrothermal system as suggested by geophysical data (Portal et al, 2019). Then, after at most six centuries (10.70 ± 0.15 ka), the edifice was mantled by the summit, late thin phreatic eruption deposits (CR formation, Miallier et al, 2010).…”

Section: Post-pdd Eruption Eventsmentioning

confidence: 91%

“…Supplementary Information C) of the trachytic material and the presence of fractures and associated fumarolised zones documented by both field and geophysical data(Portal et al, 2019). Only few explosions occurred, as attested by the presence of rare bomb sags and cross bedding in some pyroclastites interstratified in the BAF deposits.…”

mentioning

confidence: 85%

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Multi-stage growth of the trachytic lava dome of the Puy de Dôme (Chaîne des Puys, France). Field, geomorphological and petro-geochemical evidence

Deniel

Boivin

Miallier

et al. 2020

Journal of Volcanology and Geothermal Research

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Section: Fumarolic Activitysupporting

confidence: 87%

Section: Post-pdd Eruption Eventsmentioning

confidence: 91%

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Multi-stage growth of the trachytic lava dome of the Puy de Dôme (Chaîne des Puys, France). Field, geomorphological and petro-geochemical evidence

Deniel

Boivin

Miallier

et al. 2020

Journal of Volcanology and Geothermal Research

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“…Proximal tephra deposits from the eruption cover a large part of the Chaîne des Puys, including the top and northern flank of the Puy de Dôme edifice (1450 m a.s.l) located 800 m north-east of Kilian crater (Colombier et al 2017a;Boivin and Thouret 2014;Portal et al 2019). A distal tephra layer possibly from Kilian has been identified as far as Soppensee lake in Switzerland (Lane et al 2011).…”

Section: Geological Settingmentioning

confidence: 99%

Rheological change and degassing during a trachytic Vulcanian eruption at Kilian Volcano, Chaîne des Puys, France

et al. 2020

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Magma ascent during silicic dome-forming eruptions is characterized by significant changes in magma viscosity, permeability, and gas overpressure in the conduit. These changes depend on a set of parameters such as ascent rate, outgassing and crystallization efficiency, and magma viscosity, which in turn may influence the prevailing conditions for effusive versus explosive activity. Here, we combine chemical and textural analyses of tephra with viscosity models to provide a better understanding of the effusive-explosive transitions during Vulcanian phases of the 9.4 ka eruption of Kilian Volcano, Chaîne des Puys, France. Our results suggest that effusive activity at the onset of Vulcanian episodes at Kilian Volcano was promoted by (i) rapid ascent of initially crystal-poor and volatile-rich trachytic magma, (ii) a substantial bulk and melt viscosity increase driven by extensive volatile loss and crystallization, and (iii) efficient degassing/outgassing in a crystal-rich magma at shallow depths. Trachytic magma repeatedly replenished the upper conduit, and variations in the amount of decompression and cooling caused vertical textural stratification, leading to variable degrees of crystallization and outgassing. Outgassing promoted effusive dome growth and occurred via gas percolation through large interconnected vesicles, fractures, and tuffisite veins, fostering the formation of cristobalite in the carapace and talus regions. Build-up of overpressure was likely caused by closing of pore space (bubbles and fractures) in the dome through a combination of pore collapse, cristobalite formation, sintering in tuffisite veins, and limited pre-fragmentation coalescence in the dome or underlying hot vesicular magma. Sealing of the carapace may have caused a transition from open- to closed- system degassing and to renewed explosive activity. We generalize our findings to propose that the broad spectrum of eruptive styles for trachytic magmas may be inherited from a combination of characteristics of trachytic melts that include high water solubility and diffusivity, rapid microlite growth, and low melt viscosity compared to their more evolved subalkaline dacitic and rhyolitic equivalents. We show that trachytes may erupt with a similar style (e.g., Vulcanian) but at significantly higher ascent rates than their andesitic, dacitic, and rhyolitic counterparts. This suggests that the periodicity of effusive-explosive transitions at trachytic volcanoes may differ from that observed at the well-monitored andesitic, dacitic, and rhyolitic volcanoes, which has implications for hazard assessment associated with trachytic eruptions.

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“…In contrast, the resistivity can be surveyed on the ground surface by means of some EM soundings, such as the magnetotellurics (MT), the time-domain electromagnetics (TDEM) and the electrical resistivity tomography (ERT). Among them, the ERT, which is often deployed as a densely-arrayed electrodes, is capable of finest imaging of the near-surface down to about 50 m (e.g., [18,19]). The MT, as compared to the ERT, is less sensitive to the very surface, but has an advantage in an extended sounding depth to image a hydrothermal system.…”

Section: Roles Of the Studies On The Resistivity Structure As An Evalmentioning

confidence: 99%

Significance of Electromagnetic Surveys at Active Volcanoes: Toward Evaluating the Imminence of Wet Eruptions

Hashimoto¹,

Kanda²,

Morita³

et al. 2019

JDR

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The detection capability of various anomalous phenomena preceding volcanic eruptions has considerably progressed as the geophysical monitoring networks have become denser and multi-disciplinary. However, current eruption forecasting techniques, from a practical perspective, still have much scope for improvement because they largely depend on empirical techniques. In the past decade, three-dimensional modeling based on the electromagnetic sounding methods such as magnetotellurics (MT) have become a practical choice, and its recent applications to active volcanic fields has revealed certain common features among volcanoes. Information about the resistivity structure, especially in ‘wet’ volcanic fields, is useful for the provisional screening of the eruption potential from the viewpoint of the subsurface structure, and, thus, may contribute to the evaluation of eruption imminence in a broad sense. In this study, for evaluation purposes, we present the roles and possible further applications of the subsurface resistivity structure studies by demonstrating the preliminary results and interpretations of an MT survey that we performed in the Kuttara Volcanic Group, northern Japan.

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3D electrical imaging of the inner structure of a complex lava dome, Puy de Dôme volcano (French Massif Central, France)

Cited by 13 publications

References 30 publications

Multi-stage growth of the trachytic lava dome of the Puy de Dôme (Chaîne des Puys, France). Field, geomorphological and petro-geochemical evidence

Multi-stage growth of the trachytic lava dome of the Puy de Dôme (Chaîne des Puys, France). Field, geomorphological and petro-geochemical evidence

Rheological change and degassing during a trachytic Vulcanian eruption at Kilian Volcano, Chaîne des Puys, France

Significance of Electromagnetic Surveys at Active Volcanoes: Toward Evaluating the Imminence of Wet Eruptions

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