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Continuous magma recharge at Mt. Etna during the 2011–2013 period controls the style of volcanic activity and compositions of erupted lavas

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Abstract

Volcanic rocks erupted during the January 2011 - April 2013 paroxysmal sequence at Mt. Etna volcano have been investigated through in situ microanalysis of mineral phases and whole rock geochemistry. These products have been also considered within the framework of the post-2001 record, evidencing that magmas feeding the 2011–2013 paroxysmal activity inherited deep signature comparable to that of the 2007–2009 volcanic rocks for what concerns their trace element concentration. Analysis performed on plagioclase, clinopyroxene and olivine, which are sensitive to differentiation processes, show respectively fluctuations of the An, Mg# and Fo contents during the considered period. Also major and trace elements measured on the whole rock provide evidence of the evolutionary degree variations through time. Simulations by MELTS at fixed chemical-physical parameters allowed the definition of feeding system dynamics controlling the geochemical variability of magmas during the 2011–2013 period. Specifically, compositional changes have been interpreted as due to superimposition of fractional crystallization and mixing in variable proportions with more basic magma ascending from intermediate to shallower levels of the plumbing system. Composition of the recharging end-member is compatible with that of the most basic magmas emitted during the 2007 and the early paroxysmal eruptions of 2012. Analysis of the erupted volumes of magma combined with its petrologic evolution through time support the idea that large volumes of magma are continuously intruded and stored in the intermediate plumbing system after major recharging phases in the deepest levels of it. Transient recharge from the intermediate to the shallow levels is then responsible for the paroxysmal eruptions.

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Acknowledgments

This study was supported by research grants to Marco Viccaro from the University of Catania (Italy). Giancarlo Niceforo is greatly thanked for having given support for the XRF analyses at the University of Calabria. The work benefited from comments and suggestions of the J. Raith, B. De Vivo and of an anonymous reviewer.

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Authors and Affiliations

  1. Dipartimento di Scienze Biologiche, Geologiche e Ambientali – Sezione di Scienze della Terra, Volcanology Research Group, Università di Catania, Corso Italia 57, I-95129, Catania, Italy

    Marco Viccaro, Rosario Calcagno, Ileana Garozzo, Marisa Giuffrida & Eugenio Nicotra

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  1. Marco Viccaro
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  2. Rosario Calcagno
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  3. Ileana Garozzo
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  4. Marisa Giuffrida
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  5. Eugenio Nicotra
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Correspondence to Marco Viccaro.

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Editorial handling: B. De Vivo

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Viccaro, M., Calcagno, R., Garozzo, I. et al. Continuous magma recharge at Mt. Etna during the 2011–2013 period controls the style of volcanic activity and compositions of erupted lavas. Miner Petrol 109, 67–83 (2015). https://doi.org/10.1007/s00710-014-0352-4

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