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A magmatic source for fumaroles and diffuse degassing from the summit crater of Teide Volcano (Tenerife, Canary Islands): a geochemical evidence for the 2004–2005 seismic–volcanic crisis

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Abstract

The present work reports the results of 15 studies of diffuse CO2 degassing performed at Teide Volcano crater (Canary Island, Spain) and the chemical and isotopic compositions of fluids discharged from a fumarolic field located at the top of the volcano as measured between 1991 and 2010. A higher contribution of magmatic gases accompanied by enhanced total diffuse CO2 emissions were observed in relation with a seismic crisis that occurred in Tenerife Island between 2001 and 2005, with the main peak of seismic activity between April and June 2004. A significant pulse in total diffuse CO2 emission was observed at the crater of Teide (up to 26.3 t day−1) in 2001. In December 2003, the chemical composition of the Teide fumarole changed significantly, including the appearance of SO2, an increase in the HCl and CO concentrations and in the C2H6/C2H4 and C3H8/C3H6 ratios, and a decrease in the H2S, CH4, and C6H6 concentrations and in the gas/steam ratio. A few months after a drastic decrease in seismic activity, the SO2, HCl, and CO concentrations and the C2H6/C2H4 and C3H8/C3H6 ratios strongly decreased, whereas the CH4 and C6H6 concentrations and the gas/steam ratios increased. According to the trends shown by both the geochemical parameters and the seismic signals late in the observation period, the risk of a rejuvenation of volcanic activity at Teide is considered to be low. The associated temporal changes in seismic activity and magmatic degassing indicate that geophysical and fluid geochemistry signals in this system are related. Future monitoring programs aimed at mitigating volcanic hazard on Tenerife Island should involve coupled geophysical and geochemical studies.

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Acknowledgments

We are grateful to the Teleférico Pico del Teide S.A. and all their staff for their assistance during the fieldworks at the summit or Teide Volcano and to Teide National Park for the important logistic support. We also thank a significant number of undergraduate students from The University of La Laguna for their enthusiastic collaboration during field work, as well as K. Nagao and A. Shimizu for their help in noble gas isotope analyses. This research was supported by the Cabildo Insular de Tenerife and through grants from the EU Programme INTEREG IIIB Azores–Madeira–Canarias (ALERTA-MAC/2.3/C56, and ALERTA II-03/MAC/4.1/C6), Spanish Ministry of Science and Technology (CGL2005-07509), Canary Islands Government Research Agency, ACIISI (SolSubC200801000385), and MAC Transnational Cooperation EU Programme 2007–2013 (MAKAVOL-MAC/3/C161). We wish to thank D. Rouwet, J. Lewicki, S. Giammanco, G. Williams Jones, and P. Delmelle for helpful comments on the manuscript.

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Melián, G., Tassi, F., Pérez, N. et al. A magmatic source for fumaroles and diffuse degassing from the summit crater of Teide Volcano (Tenerife, Canary Islands): a geochemical evidence for the 2004–2005 seismic–volcanic crisis. Bull Volcanol 74, 1465–1483 (2012). https://doi.org/10.1007/s00445-012-0613-1

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Keywords

  • Teide Volcano
  • Geochemical monitoring
  • Fumarolic fluids
  • Diffuse CO2 efflux