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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

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
Scopus
Web of Science
Relationen in KITopen
Globale Ziele für nachhaltige Entwicklung Ziel 7 – Bezahlbare und saubere Energie

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: 7
Seitenaufrufe: 131
seit 08.12.2022
Downloads: 104
seit 08.12.2022
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