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Shallow and Deep Electric Structures in the Tolhuaca Geothermal System (S. Chile) Investigated by Magnetotellurics

Pavez, Maximiliano 1,2; Diaz, Daniel; Brasse, Heinrich; Kapinos, Gerhard; Budach, Ingmar; Goldberg, Valentin ORCID iD icon 1; Morata, Diego; Schill, Eva ORCID iD icon 2
1 Institut für Angewandte Geowissenschaften (AGW), Karlsruher Institut für Technologie (KIT)
2 Institut für Nukleare Entsorgung (INE), Karlsruher Institut für Technologie (KIT)

Abstract:

The geoelectric properties of the geothermal system associated with the Tolhuaca volcano were investigated by three-dimensional (3D) inversion of magnetotelluric (MT) data. This study presents the first resistivity model of the Tolhuaca volcano derived from 3D MT inversion to have a better understanding of its magmatic and hydrothermal system. We selected data from 54 MT stations for 3D inversion. We performed a series of 3D MT inversion tests by changing the type of data to be inverted, as well as the starting model to obtain a model in agreement with the geology. The final 3D MT model presents a conductive body (<20 Ωm) located 2 km below the summit of Tolhuaca volcano, inferred as a shallow magmatic storage compartment. We also distinguish a ~300 m thick layer of high conductivity (<10 Ωm) corresponding to argillic hydrothermal alteration. The MT model includes two resistive bodies (~200 Ωm) in the upper crust below the laterally displaced argillic alteration layer to the west beneath the extinct Tolhuaca, which would correspond to a shallow reservoir (~1000 m from the surface) and a deep reservoir (>1800 m from the surface) that had so far not been identified by previous resistivity models. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000153501
Veröffentlicht am 07.12.2022
Originalveröffentlichung
DOI: 10.3390/rs14236144
Scopus
Zitationen: 6
Web of Science
Zitationen: 5
Dimensions
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Institut für Nukleare Entsorgung (INE)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 04.12.2022
Sprache Englisch
Identifikator ISSN: 2072-4292
KITopen-ID: 1000153501
HGF-Programm 38.04.04 (POF IV, LK 01) Geoenergy
Erschienen in Remote Sensing
Verlag MDPI
Band 14
Heft 23
Seiten Art.-Nr.: 6144
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 03.12.2022
Schlagwörter magnetotellurics, electrical structures, magmatic/hydrothermal fluids, geothermal reservoir
Nachgewiesen in Dimensions
Web of Science
Scopus
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Globale Ziele für nachhaltige Entwicklung Ziel 7 – Bezahlbare und saubere Energie
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