Variability of alkali and heavy metal fluxes released by Mt. Etna volcano, Sicily, between 1991 and 1995

Gauthier, Pierre‐Jean; Cloarec, Marie-Françoise Le

doi:10.1016/s0377-0273(98)00002-x

Cited by 100 publications

(67 citation statements)

References 28 publications

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“…This scenario is consistent with geochemistry of degassing at different craters of Etna volcano, that indicates the Voragine and BN craters as the primary site of magma degassing, while the evidence of fractional magma degassing at the SE crater is explained in terms of branching from a primary conduit [Gauthier and Le Cloarec, 1998;Burton et al, 2003].…”

Section: Evidence For a Branched Shallow Feeding Systemsupporting

confidence: 86%

Infrasonic evidences for branched conduit dynamics at Mt. Etna volcano, Italy

Marchetti

Ripepe

Ulivieri

et al. 2009

Geophysical Research Letters

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[1] On multi-vents volcanoes changes in activity between different vents reflect a complex fluid-dynamics of the shallow feeding systems and are often explained numerically and experimentally in terms of conduit branches and bifurcations. We present new geophysical constraints on the shallow feeding system of Etna volcano derived from array analysis of infrasound radiated from two distinct sources, one located in the SE crater and one in the Voragine or NE crater (VNE). These two sources alternated in their behavior, with the VNE crater system radiating low amplitude background infrasound interrupted by episodes of increased infrasound radiation from the SE crater. This switching behavior suggested a branched shallow feeding system strongly controlled by the gas/magma-flux. Here, the VNE craters represented the preferential and most stable branch of degassing during stationary flux regime, while the SE crater branch activated in response to an increase in the magma/gas supply rate.

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Section: Evidence For a Branched Shallow Feeding Systemsupporting

confidence: 86%

Infrasonic evidences for branched conduit dynamics at Mt. Etna volcano, Italy

Marchetti

Ripepe

Ulivieri

et al. 2009

Geophysical Research Letters

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“…The emanation coefficient of lead in basaltic systems appears to be higher in calk-alkaline systems than in other geodynamical settings [21]. At Mount Etna, like at other arc-related basaltic volcanoes, it has a value of approximately 1.0 ± 0.5% [14,17,31,32]. Therefore, the minimum value for ( 210 Po/ 210 Pb) activity ratios in Mount Etna gases should be around 100, which has never been measured, excepted at the beginning of the 1992 eruption [19].…”

Section: Po Radioactive Disequilibria In Volcanic Plumesmentioning

confidence: 91%

A New Degassing Model to Infer Magma Dynamics from Radioactive Disequilibria in Volcanic Plumes

et al. 2018

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Pb within gas bubbles en route to the surface. Theoretical short-lived radioactive disequilibria in volcanic gases predicted by this new model differ from those produced by the former models and better match the values we measured in the plume during the 2015 campaign. A Monte Carlo-like simulation based on variable parameters characterising the degassing process (magma residence time in the degassing reservoir, gas transfer time, Rn-Pb-Bi-Po volatilities, magma volatile content) suggests that short-lived disequilibria in volcanic gases may be of use to infer both magma dynamics and degassing kinetics beneath Mount Etna, and in general at basaltic volcanoes. However, this simulation emphasizes the need for accurately determined input parameters in order to produce unambiguous results, allowing sharp characterisation of degassing processes.

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“…The emanation coefficients given are estimated in a range of ways (which are indicated as footnotes for each sub-table). The emanation coefficient of these elements from the magma can be assessed from their mean enrichment factor (EF) and the emanation coefficient of Pb from molten basalt (which may be assumed to be constant at 0.01 23 ), as 1,3,24 :…”

Section: Supplementary Figurementioning

confidence: 99%