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Tracking Magmatic Hydrogen Sulfur Circulations Using Electrical Impedance : Complex Electrical Properties of Core Samples at the Krafla Volcano, Iceland

Lévy, L. LU ; Gibert, B. ; Sigmundsson, F. LU ; Deldicque, D. ; Parat, F. and Hersir, G. P. (2019) In Journal of Geophysical Research: Solid Earth 124(3). p.2492-2509
Abstract

Interaction of H2S escaping from magma and basaltic rocks leads to pyrite mineralization, witnessing active hydrothermal circulation. We study the possibility to track this process using geoelectrical methods. Complex conductivity spectra of 30 core samples from the Krafla volcano, Iceland, measured in the laboratory, indicate that pyrite can be discriminated from other minerals present in volcanic environments, such as iron oxides and clays. Joint evaluation of the maximum phase angle of electrical impedance and its real part at low frequency is required. The volume of metallic particles (pyrite or iron oxides) can be estimated from the maximum phase angle, but a decrease of the maximum phase angle with increased fluid... (More)

Interaction of H2S escaping from magma and basaltic rocks leads to pyrite mineralization, witnessing active hydrothermal circulation. We study the possibility to track this process using geoelectrical methods. Complex conductivity spectra of 30 core samples from the Krafla volcano, Iceland, measured in the laboratory, indicate that pyrite can be discriminated from other minerals present in volcanic environments, such as iron oxides and clays. Joint evaluation of the maximum phase angle of electrical impedance and its real part at low frequency is required. The volume of metallic particles (pyrite or iron oxides) can be estimated from the maximum phase angle, but a decrease of the maximum phase angle with increased fluid conductivity or smectite volume is also observed and needs to be considered in the estimation. The laboratory observations can guide interpretation of field observations for estimation of pyrite volume in volcanic environments.

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author
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publishing date
type
Contribution to journal
publication status
published
subject
keywords
electrical impedance, hydrogen sulfur, hydrothermal systems, iron oxides, pyrite, smectite
in
Journal of Geophysical Research: Solid Earth
volume
124
issue
3
pages
18 pages
publisher
Wiley-Blackwell
external identifiers
  • scopus:85062718890
ISSN
2169-9313
DOI
10.1029/2018JB016814
language
English
LU publication?
no
additional info
Funding Information: The complete electrical impedance files in ascii format (Data Set?S1) are available online on the sip-archiv.de collaborative platform. The phase spectra for the 30 samples at six distinct pore fluid conductivities are available as supporting information (Data Set?S2). The SEM images of all analyzed samples are available to anyone upon request. The authors thank Landsvirkjun for providing the core samples and Christophe Nevado and Doriane Delmas for high-quality polished thin sections. L.?L. thanks Pauline Kessouri, Svetlana Byrdina, Jean Vandemeulebrouck, Kn?tur ?rnason, Pradip Maurya, ?lafur Fl?venz, Philippe Pezard, and Pierre Briole for fruitful discussions and Andr? Revil for recommending the use of four-electrode setup. This research was supported by the IMAGE FP7 EC and GEMex H2020 projects (grant agreements 608553 and 727550) and by a PhD grant from Paris Sciences et Lettres to L?a L?vy. We are grateful to the Editor Stephen Parman, Nicolas Florsch, and an anonymous reviewer for the efficiency of the reviewing process and valuable feedbacks, which have very much helped improve the manuscript quality. Funding Information: The complete electrical impedance files in ascii format (Data Set S1) are available online on the sip-archiv.de collaborative platform. The phase spectra for the 30 samples at six distinct pore fluid conductivities are available as supporting information (Data Set S2). The SEM images of all analyzed samples are available to anyone upon request. The authors thank Landsvirkjun for providing the core samples and Christophe Nevado and Doriane Delmas for high-quality polished thin sections. L. L. thanks Pauline Kessouri, Svetlana Byrdina, Jean Vandemeulebrouck, Knútur Árnason, Pradip Maurya, Ólafur Flóvenz, Philippe Pezard, and Pierre Briole for fruitful discussions and André Revil for recommending the use of four-electrode setup. This research was supported by the IMAGE FP7 EC and GEMex H2020 projects (grant agreements 608553 and 727550) and by a PhD grant from Paris Sciences et Lettres to Léa Lévy. We are grateful to the Editor Stephen Parman, Nicolas Florsch, and an anonymous reviewer for the efficiency of the reviewing process and valuable feedbacks, which have very much helped improve the manuscript quality. Publisher Copyright: ©2019. American Geophysical Union. All Rights Reserved.
id
1c9d78db-5e62-4625-93a4-8d30f9724d78
date added to LUP
2021-12-14 13:03:44
date last changed
2022-04-27 06:38:45
@article{1c9d78db-5e62-4625-93a4-8d30f9724d78,
  abstract     = {{<p>Interaction of H<sub>2</sub>S escaping from magma and basaltic rocks leads to pyrite mineralization, witnessing active hydrothermal circulation. We study the possibility to track this process using geoelectrical methods. Complex conductivity spectra of 30 core samples from the Krafla volcano, Iceland, measured in the laboratory, indicate that pyrite can be discriminated from other minerals present in volcanic environments, such as iron oxides and clays. Joint evaluation of the maximum phase angle of electrical impedance and its real part at low frequency is required. The volume of metallic particles (pyrite or iron oxides) can be estimated from the maximum phase angle, but a decrease of the maximum phase angle with increased fluid conductivity or smectite volume is also observed and needs to be considered in the estimation. The laboratory observations can guide interpretation of field observations for estimation of pyrite volume in volcanic environments.</p>}},
  author       = {{Lévy, L. and Gibert, B. and Sigmundsson, F. and Deldicque, D. and Parat, F. and Hersir, G. P.}},
  issn         = {{2169-9313}},
  keywords     = {{electrical impedance; hydrogen sulfur; hydrothermal systems; iron oxides; pyrite; smectite}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{2492--2509}},
  publisher    = {{Wiley-Blackwell}},
  series       = {{Journal of Geophysical Research: Solid Earth}},
  title        = {{Tracking Magmatic Hydrogen Sulfur Circulations Using Electrical Impedance : Complex Electrical Properties of Core Samples at the Krafla Volcano, Iceland}},
  url          = {{http://dx.doi.org/10.1029/2018JB016814}},
  doi          = {{10.1029/2018JB016814}},
  volume       = {{124}},
  year         = {{2019}},
}