EGU22-8639
https://doi.org/10.5194/egusphere-egu22-8639
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Diffuse emission of 3He and 4He and thermal energy released in volcanic systems

Mar Alonso1,2, Nemesio M. Pérez1,2,3, Pedro A. Hernández1,2,3, Eleazar Padrón1,2,3, Gladys Melián1,2,3, Fátima Rodríguez1, Germán Padilla1,2, José Barrancos1,2, María Asensio-Ramos1, Thrainn Fridriksson4, and Hirochika Sumino5
Mar Alonso et al.
  • 1Instituto Volcanológico de Canarias (INVOLCAN), 38320 San Cristóbal de La Laguna, Tenerife, Canary Islands
  • 2Instituto Tecnológico y de Energías Renovables (ITER), Granadilla de Abona, Canary Islands (maralcot@gmail.com)
  • 3Agencia Insular de La Energía de Tenerife (AIET), Granadilla de Abona, Tenerife, Canary Islands, Spain
  • 4Reykjavík Energy, Reykjavík, Iceland
  • 5Department of General Systems Studies, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan

Active or recent volcanism indicates the presence of high-enthalpy resources at depth. This is obvious when visible surface emanations as volcanic plumes, fumaroles, solfataras or bubblings appear. However, visible manifestations of deep anomalies do not always appear at the surface, making more difficult the detection of possible geothermal reservoirs. In this work, we propose that in areas where there are no visible emanations, it is possible to make an estimation of the associated thermal energy of the reservoir. For this purpose, 15 volcanic systems located in different geotectonic environments have been studied, where diffuse 3He and 4He emission and thermal energy released have been calculated. This work has focused on the study of diffuse He emissions due to its chemically conservative properties as a noble gas, helium is an excellent indicator of magmatic activity allowing to delimit permeable areas of preferential ascent of deep origin fluids. Two different methodologies for the calculation of diffuse 3He and 4He emissions have been proposed. In addition, the thermal energy released has been calculated following the methodology proposed by Chiodini et al., 2001. A consistent observation across the entire study is that those areas with relatively high diffuse 3He and 4He emissions also show relatively high thermal energy released values, suggesting a clear and positive relationship between the parameters. This implies that, in volcanic areas where no visible geothermal emanations are observed, and therefore, the inability to sample, but anomalies in the diffuse 4He emission are present, there should be a deep thermal anomaly associated, and therefore, a possible geothermal reservoir.

 

  • Chiodini, F. Frondini, C. Cardellini, D. Granieri, L. Marini, G. Ventura. CO2 degassing and energy release at Solfatara volcano, Campi Flegrei, Italy. J. Geophys. Res. 106 (B8) (2001) 16213e16221, https://doi.org/10.1029/2001JB000246.

How to cite: Alonso, M., Pérez, N. M., Hernández, P. A., Padrón, E., Melián, G., Rodríguez, F., Padilla, G., Barrancos, J., Asensio-Ramos, M., Fridriksson, T., and Sumino, H.: Diffuse emission of 3He and 4He and thermal energy released in volcanic systems, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-8639, https://doi.org/10.5194/egusphere-egu22-8639, 2022.