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Diffuse CO2 Degassing and Thermal Energy Release from Poás Volcano, Costa Rica

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Poás Volcano

Part of the book series: Active Volcanoes of the World ((AVOLCAN))

Abstract

During the period 2000–2003 four soil CO2 efflux surveys were carried out at Poás volcano (Costa Rica) to investigate the spatial distribution and evaluate the diffuse CO2 emission as well as its associated thermal energy. Inspection of soil CO2 efflux maps showed that the highest values were always identified inside the Main Crater of Poás, being the 2002 survey the one with the highest number of anomalous observed values. The spatial distribution of soil CO2 efflux and the δ13C–CO2 values in soil gas samples showed a positive correlation with the main volcanic-structural features of the area. Main soil CO2 efflux anomalies were identified close to fumaroles, where several acidic hot springs and soils with high permeability were recognized. Temporal evolution of diffuse CO2 emissions showed the lowest emission rate in 2000 (164 ± 15 t d−1), followed by a significant increase inside the active crater during 2001 and 2002 (423 ± 54 and 537 ± 69 t d−1, respectively) and with a relatively constant value in 2003 (542 ± 63 t d−1). These data correlated with the observed changes in the δ13C–CO2 mean value of collected soil gases. To estimate the thermal energy release associated with the diffuse CO2 degassing, we considered the diffuse CO2 emission released from the active crater as the most representative of a deep-seated source. Calculated thermal energy released through soil was estimated in 255, 548 and 831 MW for 2000, 2001 and 2003 surveys, respectively. Temporal variations of the diffuse CO2 degassing and thermal energy release also showed a good correlation with the δ13C–CO2 values and 3He/4He ratios measured in the fumarolic discharges of Poás during the same period, with a significant mantle-derived contribution. These observations evidenced the occurrence of changes in the shallow magmatic-hydrothermal system of Poás that were likely related to a potential magmatic intrusion during the period 2000–2003.

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Acknowledgements

We are indebted to Juan Dobles and all the staff of the Poás National Park for their assistance during the fieldworks. We would also like to thank COVIRENAS, students of the Escuela Centroamericana de Geología, Universidad de Costa Rica, and Juan Carlos Mesa for their help during this study. This research was supported by the Cabildo Insular de Tenerife, CajaCanarias (Canary Islands, Spain) and the CGL2005-07509/CLI project of the MICINN, Spain.

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Authors and Affiliations

  1. Environmental Research Division, Instituto Tecnológico y de Energías Renovables (ITER), 38611, Granadilla de Abona, S/C de Tenerife, Spain

    Gladys V. Melián, Nemesio M. Pérez & Pedro A. Hernández

  2. Instituto Volcanológico de Canarias (INVOLCAN), INtech La Laguna, 38320, San Cristóbal de La Laguna, Tenerife, Canary Island, Spain

    Gladys V. Melián, Nemesio M. Pérez & Pedro A. Hernández

  3. Agencia Insular de Energía de Tenerife (AIET), 38611, Granadilla de Abona, S/C de Tenerife, Canary Islands, Spain

    Gladys V. Melián, Nemesio M. Pérez & Pedro A. Hernández

  4. Escuela Centroamericana de Geología, University of Costa Rica (UCR), 1000, San José, Costa Rica

    Raúl Alberto Mora Amador

  5. Centro de Investigaciones en Ciencias Geológicas (CICG), University of Costa Rica (UCR), 1000, San José, Costa Rica

    Carlos Ramírez & Mario Fernández

  6. Department of Basic Science, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902, Japan

    Hirochicka Sumino

  7. Área de Amenazas y Auscultación Sismológica y Volcánica, Instituto Costarricense de Electricidad (ICE), Apdo, 10032-1000, San Jose, Costa Rica

    Guillermo E. Alvarado

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  1. Gladys V. Melián
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Correspondence to Gladys V. Melián .

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Editors and Affiliations

  1. Department of Earth Sciences, University of Florence, Florence, Italy

    Franco Tassi

  2. Department of Earth Sciences, University of Florence, Florence, Italy

    Orlando Vaselli

  3. Escuela Centroamericana de Geología, The University of Costa Rica, San Josè, Costa Rica

    Raul Alberto Mora Amador

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Melián, G.V. et al. (2019). Diffuse CO2 Degassing and Thermal Energy Release from Poás Volcano, Costa Rica. In: Tassi, F., Vaselli, O., Mora Amador, R. (eds) Poás Volcano. Active Volcanoes of the World. Springer, Cham. https://doi.org/10.1007/978-3-319-02156-0_6

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