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Exploration of deep-seated geothermal reservoirs in the Canary Islands by means of soil CO2 degassing surveys

Author

Listed:
  • Rodríguez, Fátima
  • Pérez, Nemesio M.
  • Melián, Gladys V.
  • Padrón, Eleazar
  • Hernández, Pedro A.
  • Asensio-Ramos, María
  • Padilla, Germán D.
  • Barrancos, José
  • D’Auria, Luca

Abstract

The Canary Islands are the only Spanish territory that holds potential for high enthalpy geothermal resources, although there is no evidence in the islands of hydrothermal fluid discharges in the surficial environment except for Teide volcano fumaroles in Tenerife. We herein report the results of several diffuse carbon dioxide (CO2) degassing surveys carried out at six mining licenses across Tenerife (Berolo, Guayafanta, Abeque, Garehagua and Garehagua II) and Gran Canaria (Atidama), covering a total of 640 km2 and more than 3230 sampling sites. Selected geochemical molar ratios, spatial distribution of CO2 efflux, statistical-graphical analysis of CO2 efflux, isotopic composition of CO2 (δ13C–CO2), the calculated volcano-hydrothermal contribution of CO2 and the deep-seated CO2 efflux were studied. These data were combined and used for geothermal exploration, demonstrating an effective reconnaissance strategy that reduces risk and cost. Garehagua II, Garehagua (both located in the north-south volcanic rift of Tenerife) and Abeque (located in the northwest volcanic rift of Tenerife) are, in this order, the mining licenses studied that showed the highest potential to contain geothermal resources, based on the geochemical indicators ranking proposed.

Suggested Citation

  • Rodríguez, Fátima & Pérez, Nemesio M. & Melián, Gladys V. & Padrón, Eleazar & Hernández, Pedro A. & Asensio-Ramos, María & Padilla, Germán D. & Barrancos, José & D’Auria, Luca, 2021. "Exploration of deep-seated geothermal reservoirs in the Canary Islands by means of soil CO2 degassing surveys," Renewable Energy, Elsevier, vol. 164(C), pages 1017-1028.
    • Handle: RePEc:eee:renene:v:164:y:2021:i:c:p:1017-1028
    DOI: 10.1016/j.renene.2020.09.065
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    References listed on IDEAS

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    1. Colmenar-Santos, Antonio & Folch-Calvo, Martin & Rosales-Asensio, Enrique & Borge-Diez, David, 2016. "The geothermal potential in Spain," Renewable and Sustainable Energy Reviews, Elsevier, vol. 56(C), pages 865-886.
    2. Fridriksson, Thráinn & Padrón, Eleazar & Óskarsson, Finnbogi & Pérez, Nemesio M., 2016. "Application of diffuse gas flux measurements and soil gas analysis to geothermal exploration and environmental monitoring: Example from the Reykjanes geothermal field, SW Iceland," Renewable Energy, Elsevier, vol. 86(C), pages 1295-1307.
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    1. Alonso, Mar & Pérez, Nemesio M. & Hernández, Pedro A. & Padrón, Eleazar & Melián, Gladys & Rodríguez, Fátima & Padilla, Germán & Barrancos, José & Asensio-Ramos, María & Fridriksson, Thráinn & Sumino,, 2022. "Thermal energy and diffuse 4He and 3He degassing released in volcanic-geothermal systems," Renewable Energy, Elsevier, vol. 182(C), pages 17-31.

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