Integrated interpretation of geophysical data from Zagros mountain belt (Iran)

Fluid composition and distribution, the key factors determining geoelectric structure in a seismically active region, are controlled by local and regional stresses and rheological contrasts. In the central Zagros collision zone, one of the world's most seismically active mountain belt, almost c...

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Autores: Montahaei, Mansoure, Queralt i Capdevila, Pilar, Ledo Fernández, Juanjo, Oskooi, Behrooz, Muñoz, J. A., Marcuello Pascual, Alejandro
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2020
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/183597
Acceso en línea:https://hdl.handle.net/2445/183597
Access Level:acceso abierto
Palabra clave:Sismologia
Geofísica
Iran
Seismology
Geophysics
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spelling Integrated interpretation of geophysical data from Zagros mountain belt (Iran)Montahaei, MansoureQueralt i Capdevila, PilarLedo Fernández, JuanjoOskooi, BehroozMuñoz, J. A.Marcuello Pascual, AlejandroSismologiaGeofísicaIranSeismologyGeophysicsIranFluid composition and distribution, the key factors determining geoelectric structure in a seismically active region, are controlled by local and regional stresses and rheological contrasts. In the central Zagros collision zone, one of the world's most seismically active mountain belt, almost coincident magnetotelluric and seismic velocity profiles are jointly interpreted to recover more accurately structural boundaries and fluid distribution within the crust. A multi-site and multi-frequency approach was used for the strike analysis of regional structure and decomposition of distortion effects on magnetotelluric data. Distortion corrected magnetotelluric data were then used for two- dimensional inversion modeling. The results image a thick conductive overburden in the southwest of the profile, high conductivities attributed to the fault zone conductors (FZCs) and an almost concave conductor extending from middle to lower crust in the central- eastern portion of the mountain belt, beneath the High Zagros (HZ). Comparison with the already available S- velocity structure, obtained by joint inversion of P-wave receiver functions and surface wave dispersion data, shows that these main conductive features are spatially correlated with a low-velocity layer representative of the sedimentary cover overlying the Arabian platform and a velocity contrast bounded by the main Zagros thrust (MZT) fault, indicating the presence of fault zone fluids. The joint interpretation of magnetotelluric inverse modeling and seismicity data also shed light on fluid generation influencing rock deformation and seismicity in this region. It suggests that beneath the HZ, deep crustal fluids generated through metamorphism may promote aseismic deformations before high stresses are buildup and cause the north- eastern part of the Zagros Fold and Thrust Belt (ZFTB) to be seismically inactive compared to its south- western part.Springer Verlag2022202220202022info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion31 p.application/pdfhttps://hdl.handle.net/2445/183597Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésVersió postprint del document publicat a: https://doi.org/10.1007/s12303-020-0024-9Geosciences Journal, 2020, vol. 25, num. 3, p. 321-331https://doi.org/10.1007/s12303-020-0024-9(c) Association of Korean Geoscience Societies, 2020info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1835972026-05-29T05:05:01Z
dc.title.none.fl_str_mv Integrated interpretation of geophysical data from Zagros mountain belt (Iran)
title Integrated interpretation of geophysical data from Zagros mountain belt (Iran)
spellingShingle Integrated interpretation of geophysical data from Zagros mountain belt (Iran)
Montahaei, Mansoure
Sismologia
Geofísica
Iran
Seismology
Geophysics
Iran
title_short Integrated interpretation of geophysical data from Zagros mountain belt (Iran)
title_full Integrated interpretation of geophysical data from Zagros mountain belt (Iran)
title_fullStr Integrated interpretation of geophysical data from Zagros mountain belt (Iran)
title_full_unstemmed Integrated interpretation of geophysical data from Zagros mountain belt (Iran)
title_sort Integrated interpretation of geophysical data from Zagros mountain belt (Iran)
dc.creator.none.fl_str_mv Montahaei, Mansoure
Queralt i Capdevila, Pilar
Ledo Fernández, Juanjo
Oskooi, Behrooz
Muñoz, J. A.
Marcuello Pascual, Alejandro
author Montahaei, Mansoure
author_facet Montahaei, Mansoure
Queralt i Capdevila, Pilar
Ledo Fernández, Juanjo
Oskooi, Behrooz
Muñoz, J. A.
Marcuello Pascual, Alejandro
author_role author
author2 Queralt i Capdevila, Pilar
Ledo Fernández, Juanjo
Oskooi, Behrooz
Muñoz, J. A.
Marcuello Pascual, Alejandro
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Sismologia
Geofísica
Iran
Seismology
Geophysics
Iran
topic Sismologia
Geofísica
Iran
Seismology
Geophysics
Iran
description Fluid composition and distribution, the key factors determining geoelectric structure in a seismically active region, are controlled by local and regional stresses and rheological contrasts. In the central Zagros collision zone, one of the world's most seismically active mountain belt, almost coincident magnetotelluric and seismic velocity profiles are jointly interpreted to recover more accurately structural boundaries and fluid distribution within the crust. A multi-site and multi-frequency approach was used for the strike analysis of regional structure and decomposition of distortion effects on magnetotelluric data. Distortion corrected magnetotelluric data were then used for two- dimensional inversion modeling. The results image a thick conductive overburden in the southwest of the profile, high conductivities attributed to the fault zone conductors (FZCs) and an almost concave conductor extending from middle to lower crust in the central- eastern portion of the mountain belt, beneath the High Zagros (HZ). Comparison with the already available S- velocity structure, obtained by joint inversion of P-wave receiver functions and surface wave dispersion data, shows that these main conductive features are spatially correlated with a low-velocity layer representative of the sedimentary cover overlying the Arabian platform and a velocity contrast bounded by the main Zagros thrust (MZT) fault, indicating the presence of fault zone fluids. The joint interpretation of magnetotelluric inverse modeling and seismicity data also shed light on fluid generation influencing rock deformation and seismicity in this region. It suggests that beneath the HZ, deep crustal fluids generated through metamorphism may promote aseismic deformations before high stresses are buildup and cause the north- eastern part of the Zagros Fold and Thrust Belt (ZFTB) to be seismically inactive compared to its south- western part.
publishDate 2020
dc.date.none.fl_str_mv 2020
2022
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/183597
url https://hdl.handle.net/2445/183597
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1007/s12303-020-0024-9
Geosciences Journal, 2020, vol. 25, num. 3, p. 321-331
https://doi.org/10.1007/s12303-020-0024-9
dc.rights.none.fl_str_mv (c) Association of Korean Geoscience Societies, 2020
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Association of Korean Geoscience Societies, 2020
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 31 p.
application/pdf
dc.publisher.none.fl_str_mv Springer Verlag
publisher.none.fl_str_mv Springer Verlag
dc.source.none.fl_str_mv Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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