Complex conductivity of volcanic rocks and the geophysical mapping of alteration in volcanoes
International audience Induced polarization measurements can be used to image alteration at the scale of volcanic edifices to a depth of few kilometers. Such a goal cannot be achieved with electrical conductivity alone, because too many textural and environmental parameters influence the electrical...
Published in: | Journal of Volcanology and Geothermal Research |
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Main Authors: | , , , , , , , , |
Other Authors: | , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2018
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Online Access: | https://hal.archives-ouvertes.fr/hal-02324339 https://hal.archives-ouvertes.fr/hal-02324339/document https://hal.archives-ouvertes.fr/hal-02324339/file/2018-JVGR-complex%20conductivity%20volcanoes.pdf https://doi.org/10.1016/j.jvolgeores.2018.04.014 |
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[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
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[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Ghorbani, A. Revil, A. Coperey, A. Ahmed, A, Roque, S. Heap, M.J. Grandis, H. Viveiros, F. Soueid Ahmed, A. Complex conductivity of volcanic rocks and the geophysical mapping of alteration in volcanoes |
topic_facet |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Induced polarization measurements can be used to image alteration at the scale of volcanic edifices to a depth of few kilometers. Such a goal cannot be achieved with electrical conductivity alone, because too many textural and environmental parameters influence the electrical conductivity of volcanic rocks. We investigate the spectral induced polarization measurements (complex conductivity) in the frequency band 10 mHz-45 kHz of 85 core samples from five volcanoes: Merapi and Papandayan in Indonesia (32 samples), Furnas in Portugal (5 samples), Yellowstone in the USA (26 samples), and Whakaari (White Island) in New Zealand (22 samples). This collection of samples covers not only different rock compositions (basaltic andesite, andesite, trachyte and rhyolite), but also various degrees of alteration. The specific surface area is found to be correlated to the cation exchange capacity (CEC) of the samples measured by the cobalthexamine method, both serving as rough proxies of the hydro-thermal alteration experienced by these materials. The in-phase (real) conductivity of the samples is the sum of a bulk contribution associated with conduction in the pore network and a surface conductivity that increases with alteration. The quadrature conductivity and the normalized chargeability are two parameters related to the polarization of the electrical double layer coating the minerals of the volcanic rocks. Both parameters increase with the degree of alteration. The surface conductivity, the quadrature conductivity, and the normalized chargeability (defined as the difference between the in-phase conductivity at high and low frequencies) are linearly correlated to the CEC normalized by the bulk tortuosity of the pore space. The effects of temperature and pyrite-content are also investigated and can be understood in terms of a physics-based model. Finally, we performed a numerical study of the use of induced polarization to image the normalized chargeability of a volcanic edifice. Induced polarization ... |
author2 |
Department of Minning and Metallurgy, Yazd University Department of Minning and Metallurgy Department of Geophysics Golden CO Colorado School of Mines Institut des Sciences de la Terre (ISTerre) Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Aix Marseille Université (AMU) Institut de physique du globe de Strasbourg (IPGS) Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Morphodynamique Continentale et Côtière (M2C) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN) Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Ghorbani, A. Revil, A. Coperey, A. Ahmed, A, Roque, S. Heap, M.J. Grandis, H. Viveiros, F. Soueid Ahmed, A. |
author_facet |
Ghorbani, A. Revil, A. Coperey, A. Ahmed, A, Roque, S. Heap, M.J. Grandis, H. Viveiros, F. Soueid Ahmed, A. |
author_sort |
Ghorbani, A. |
title |
Complex conductivity of volcanic rocks and the geophysical mapping of alteration in volcanoes |
title_short |
Complex conductivity of volcanic rocks and the geophysical mapping of alteration in volcanoes |
title_full |
Complex conductivity of volcanic rocks and the geophysical mapping of alteration in volcanoes |
title_fullStr |
Complex conductivity of volcanic rocks and the geophysical mapping of alteration in volcanoes |
title_full_unstemmed |
Complex conductivity of volcanic rocks and the geophysical mapping of alteration in volcanoes |
title_sort |
complex conductivity of volcanic rocks and the geophysical mapping of alteration in volcanoes |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.archives-ouvertes.fr/hal-02324339 https://hal.archives-ouvertes.fr/hal-02324339/document https://hal.archives-ouvertes.fr/hal-02324339/file/2018-JVGR-complex%20conductivity%20volcanoes.pdf https://doi.org/10.1016/j.jvolgeores.2018.04.014 |
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ENVELOPE(48.583,48.583,-66.733,-66.733) |
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New Zealand White Island |
geographic_facet |
New Zealand White Island |
genre |
White Island |
genre_facet |
White Island |
op_source |
ISSN: 0377-0273 Journal of Volcanology and Geothermal Research https://hal.archives-ouvertes.fr/hal-02324339 Journal of Volcanology and Geothermal Research, Elsevier, 2018, 357, pp.106-127. ⟨10.1016/j.jvolgeores.2018.04.014⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jvolgeores.2018.04.014 hal-02324339 https://hal.archives-ouvertes.fr/hal-02324339 https://hal.archives-ouvertes.fr/hal-02324339/document https://hal.archives-ouvertes.fr/hal-02324339/file/2018-JVGR-complex%20conductivity%20volcanoes.pdf doi:10.1016/j.jvolgeores.2018.04.014 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.jvolgeores.2018.04.014 |
container_title |
Journal of Volcanology and Geothermal Research |
container_volume |
357 |
container_start_page |
106 |
op_container_end_page |
127 |
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1766234038870212608 |
spelling |
ftccsdartic:oai:HAL:hal-02324339v1 2023-05-15T18:43:37+02:00 Complex conductivity of volcanic rocks and the geophysical mapping of alteration in volcanoes Ghorbani, A. Revil, A. Coperey, A. Ahmed, A, Roque, S. Heap, M.J. Grandis, H. Viveiros, F. Soueid Ahmed, A. Department of Minning and Metallurgy, Yazd University Department of Minning and Metallurgy Department of Geophysics Golden CO Colorado School of Mines Institut des Sciences de la Terre (ISTerre) Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Aix Marseille Université (AMU) Institut de physique du globe de Strasbourg (IPGS) Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Morphodynamique Continentale et Côtière (M2C) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN) Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS) 2018-05 https://hal.archives-ouvertes.fr/hal-02324339 https://hal.archives-ouvertes.fr/hal-02324339/document https://hal.archives-ouvertes.fr/hal-02324339/file/2018-JVGR-complex%20conductivity%20volcanoes.pdf https://doi.org/10.1016/j.jvolgeores.2018.04.014 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jvolgeores.2018.04.014 hal-02324339 https://hal.archives-ouvertes.fr/hal-02324339 https://hal.archives-ouvertes.fr/hal-02324339/document https://hal.archives-ouvertes.fr/hal-02324339/file/2018-JVGR-complex%20conductivity%20volcanoes.pdf doi:10.1016/j.jvolgeores.2018.04.014 info:eu-repo/semantics/OpenAccess ISSN: 0377-0273 Journal of Volcanology and Geothermal Research https://hal.archives-ouvertes.fr/hal-02324339 Journal of Volcanology and Geothermal Research, Elsevier, 2018, 357, pp.106-127. ⟨10.1016/j.jvolgeores.2018.04.014⟩ [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2018 ftccsdartic https://doi.org/10.1016/j.jvolgeores.2018.04.014 2021-11-07T01:36:10Z International audience Induced polarization measurements can be used to image alteration at the scale of volcanic edifices to a depth of few kilometers. Such a goal cannot be achieved with electrical conductivity alone, because too many textural and environmental parameters influence the electrical conductivity of volcanic rocks. We investigate the spectral induced polarization measurements (complex conductivity) in the frequency band 10 mHz-45 kHz of 85 core samples from five volcanoes: Merapi and Papandayan in Indonesia (32 samples), Furnas in Portugal (5 samples), Yellowstone in the USA (26 samples), and Whakaari (White Island) in New Zealand (22 samples). This collection of samples covers not only different rock compositions (basaltic andesite, andesite, trachyte and rhyolite), but also various degrees of alteration. The specific surface area is found to be correlated to the cation exchange capacity (CEC) of the samples measured by the cobalthexamine method, both serving as rough proxies of the hydro-thermal alteration experienced by these materials. The in-phase (real) conductivity of the samples is the sum of a bulk contribution associated with conduction in the pore network and a surface conductivity that increases with alteration. The quadrature conductivity and the normalized chargeability are two parameters related to the polarization of the electrical double layer coating the minerals of the volcanic rocks. Both parameters increase with the degree of alteration. The surface conductivity, the quadrature conductivity, and the normalized chargeability (defined as the difference between the in-phase conductivity at high and low frequencies) are linearly correlated to the CEC normalized by the bulk tortuosity of the pore space. The effects of temperature and pyrite-content are also investigated and can be understood in terms of a physics-based model. Finally, we performed a numerical study of the use of induced polarization to image the normalized chargeability of a volcanic edifice. Induced polarization ... Article in Journal/Newspaper White Island Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) New Zealand White Island ENVELOPE(48.583,48.583,-66.733,-66.733) Journal of Volcanology and Geothermal Research 357 106 127 |