Bulletin of Volcanology

, Volume 73, Issue 5, pp 531–542

First 13C/12C isotopic characterisation of volcanic plume CO2

  • Giovanni Chiodini
  • Stefano Caliro
  • Alessandro Aiuppa
  • Rosario Avino
  • Domenico Granieri
  • Roberto Moretti
  • Francesco Parello
Research Article

DOI: 10.1007/s00445-010-0423-2

Cite this article as:
Chiodini, G., Caliro, S., Aiuppa, A. et al. Bull Volcanol (2011) 73: 531. doi:10.1007/s00445-010-0423-2

Abstract

We describe analytical details and uncertainty evaluation of a simple technique for the measurement of the carbon isotopic composition of CO2 in volcanic plumes. Data collected at Solfatara and Vulcano, where plumes are fed by fumaroles which are accessible for direct sampling, were first used to validate the technique. For both volcanoes, the plume-derived carbon isotopic compositions are in good agreement with the fumarolic compositions, thus providing confidence on the method, and allowing its application at volcanoes where the volcanic component is inaccessible to direct sampling. As a notable example, we applied the same method to Mount Etna where we derived a δ13C of volcanic CO2 between −0.9 ± 0.27‰ and −1.41 ± 0.27‰ (Bocca Nuova and Voragine craters). The comparison of our measurements to data reported in previous work highlights a temporal trend of systematic increase of δ13C values of Etna CO2 from ~ −4‰, in the 1970’s and the 1980’s, to ~ −1‰ at the present time (2009). This shift toward more positive δ13C values matches a concurrent change in magma composition and an increase in the eruption frequency and energy. We discuss such variations in terms of two possible processes: magma carbonate assimilation and carbon isotopic fractionation due to magma degassing along the Etna plumbing system. Finally, our results highlight potential of systematic measurements of the carbon isotopic composition of the CO2 emitted by volcanic plumes for a better understanding of volcanic processes and for improved surveillance of volcanic activity.

Keywords

Volcanic plume Carbon isotope Etna Magmatic degassing 

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Giovanni Chiodini
    • 1
  • Stefano Caliro
    • 1
  • Alessandro Aiuppa
    • 2
    • 3
  • Rosario Avino
    • 1
  • Domenico Granieri
    • 4
  • Roberto Moretti
    • 1
  • Francesco Parello
    • 2
  1. 1.Istituto Nazionale di Geofisica e Vulcanologia Sez. Napoli Osservatorio VesuvianoNaplesItaly
  2. 2.Dipartimento CFTAUniversità di PalermoPalermoItaly
  3. 3.Istituto Nazionale di Geofisica e Vulcanologia Sez. PalermoPalermoItaly
  4. 4.Istituto Nazionale di Geofisica e Vulcanologia, Sez. PisaPisaItaly

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