Age of folding in NW Lurestan arc across the Khanaqin fault by magnetostratigraphy on Aghajari growth strata, Zagros folded belt

The timing of deformation and the age of sediments in foreland basins are key information for reconstructing the tectonic history of orogenic belts. This study, utilized magnetostratigraphic techniques to determine the ages of ∼ 2.5 km-thick strata within the Zagros folded foreland basin in the flan...

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Autores: Lashgari, A., Najafi, Mahdi, Beamud, Elisabet, Maestre, E., Vergés Masip, Jaume
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2024
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositório:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/363753
Acesso em linha:http://hdl.handle.net/10261/363753
Access Level:Acceso aberto
Palavra-chave:Zagros
Magnetostratigraphy
Aghajari formation
Timing of folding
Mesopotamian foreland basin
Khanaqin basement fault system
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spelling Age of folding in NW Lurestan arc across the Khanaqin fault by magnetostratigraphy on Aghajari growth strata, Zagros folded beltLashgari, A.Najafi, MahdiBeamud, ElisabetMaestre, E.Vergés Masip, JaumeZagrosMagnetostratigraphyAghajari formationTiming of foldingMesopotamian foreland basinKhanaqin basement fault systemThe timing of deformation and the age of sediments in foreland basins are key information for reconstructing the tectonic history of orogenic belts. This study, utilized magnetostratigraphic techniques to determine the ages of ∼ 2.5 km-thick strata within the Zagros folded foreland basin in the flank of the NW-SE-trending Emam Hassan anticline, located above the N–S-trending Khanaqin blind basement fault. This fault separates the Lurestan arc in Iran from the Kirkuk embayment in Iraqi Kurdistan. These ages were combined with a detailed structural study to establish the timing of folding and integrate it into the regional framework of the Zagros folded belt. Magnetostratigraphic results indicate a Serravallian age at ∼ 13.4 Ma for the stratigraphic boundary between the Gachsaran Formation and the pre-growth Aghajari Formation, whereas the base of the Aghajari growth strata is Tortonian age (early Late Miocene) at ∼ 10 Ma. The mean sediment accumulation rate for the Aghajari Formation is ∼ 44 cm/kyr, with short peaks reaching up to 90 cm/kyr. Linear extrapolation of these rates proposes a younger age than ∼ 6.5 Ma (Messinian) for the base of the unconformable conglomerates of the Bakhtyari Formation. The Emam Hassan folding and related Gachsaran diapirism began ∼ 10 Ma and continued for at least 3.5 Myr until ∼ 6.5 Ma, coevally with the deposition of ∼ 1.3 km of the upper Aghajari Formation. Regional synthesis reveals that multi-detachment folding within the Lurestan arc propagates in-sequence towards the foreland. Although not the central focus of this study, our results, combined with the regional structural understanding, illustrate the potential 3-D structure at the depth of the seismogenic Khanaqin Fault, the source of the 2017 Mw 7.3 Sarpol-e Zahāb Earthquake.This research was funded partly by the Group of Dynamics of the Lithosphere (GDL), Geosciences Barcelona, Geo3Bcn- CSIC through the Spanish Ministry of Economy and Competitiveness Projects ALORBE (PIE–CSIC–1063 202030E310) and MAPA (PIE–CSIC–202430E005), and Grups de Recerca Reconeguts per la Generalitat de Catalunya “Modelització Geodinàmica de la Litosfera” (2021 SGR 00410). We also thank the Paleomagnetic Laboratory CCiTUB-Geo3BCN CSIC where the analyses were conducted, as well as GGAC 2021 SGR00076 (AGAUR) and Geomodels Research Institute.ElsevierMinisterio de Economía y Competitividad (España)Generalitat de CatalunyaConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2024202420242024info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/363753reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/PIE–CSIC–1063 202030E310//info:eu-repo/grantAgreement/PIE–CSIC–202430E005//http://dx.doi.org/10.1016/j.marpetgeo.2024.106828Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3637532026-05-22T06:33:51Z
dc.title.none.fl_str_mv Age of folding in NW Lurestan arc across the Khanaqin fault by magnetostratigraphy on Aghajari growth strata, Zagros folded belt
title Age of folding in NW Lurestan arc across the Khanaqin fault by magnetostratigraphy on Aghajari growth strata, Zagros folded belt
spellingShingle Age of folding in NW Lurestan arc across the Khanaqin fault by magnetostratigraphy on Aghajari growth strata, Zagros folded belt
Lashgari, A.
Zagros
Magnetostratigraphy
Aghajari formation
Timing of folding
Mesopotamian foreland basin
Khanaqin basement fault system
title_short Age of folding in NW Lurestan arc across the Khanaqin fault by magnetostratigraphy on Aghajari growth strata, Zagros folded belt
title_full Age of folding in NW Lurestan arc across the Khanaqin fault by magnetostratigraphy on Aghajari growth strata, Zagros folded belt
title_fullStr Age of folding in NW Lurestan arc across the Khanaqin fault by magnetostratigraphy on Aghajari growth strata, Zagros folded belt
title_full_unstemmed Age of folding in NW Lurestan arc across the Khanaqin fault by magnetostratigraphy on Aghajari growth strata, Zagros folded belt
title_sort Age of folding in NW Lurestan arc across the Khanaqin fault by magnetostratigraphy on Aghajari growth strata, Zagros folded belt
dc.creator.none.fl_str_mv Lashgari, A.
Najafi, Mahdi
Beamud, Elisabet
Maestre, E.
Vergés Masip, Jaume
author Lashgari, A.
author_facet Lashgari, A.
Najafi, Mahdi
Beamud, Elisabet
Maestre, E.
Vergés Masip, Jaume
author_role author
author2 Najafi, Mahdi
Beamud, Elisabet
Maestre, E.
Vergés Masip, Jaume
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Economía y Competitividad (España)
Generalitat de Catalunya
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Zagros
Magnetostratigraphy
Aghajari formation
Timing of folding
Mesopotamian foreland basin
Khanaqin basement fault system
topic Zagros
Magnetostratigraphy
Aghajari formation
Timing of folding
Mesopotamian foreland basin
Khanaqin basement fault system
description The timing of deformation and the age of sediments in foreland basins are key information for reconstructing the tectonic history of orogenic belts. This study, utilized magnetostratigraphic techniques to determine the ages of ∼ 2.5 km-thick strata within the Zagros folded foreland basin in the flank of the NW-SE-trending Emam Hassan anticline, located above the N–S-trending Khanaqin blind basement fault. This fault separates the Lurestan arc in Iran from the Kirkuk embayment in Iraqi Kurdistan. These ages were combined with a detailed structural study to establish the timing of folding and integrate it into the regional framework of the Zagros folded belt. Magnetostratigraphic results indicate a Serravallian age at ∼ 13.4 Ma for the stratigraphic boundary between the Gachsaran Formation and the pre-growth Aghajari Formation, whereas the base of the Aghajari growth strata is Tortonian age (early Late Miocene) at ∼ 10 Ma. The mean sediment accumulation rate for the Aghajari Formation is ∼ 44 cm/kyr, with short peaks reaching up to 90 cm/kyr. Linear extrapolation of these rates proposes a younger age than ∼ 6.5 Ma (Messinian) for the base of the unconformable conglomerates of the Bakhtyari Formation. The Emam Hassan folding and related Gachsaran diapirism began ∼ 10 Ma and continued for at least 3.5 Myr until ∼ 6.5 Ma, coevally with the deposition of ∼ 1.3 km of the upper Aghajari Formation. Regional synthesis reveals that multi-detachment folding within the Lurestan arc propagates in-sequence towards the foreland. Although not the central focus of this study, our results, combined with the regional structural understanding, illustrate the potential 3-D structure at the depth of the seismogenic Khanaqin Fault, the source of the 2017 Mw 7.3 Sarpol-e Zahāb Earthquake.
publishDate 2024
dc.date.none.fl_str_mv 2024
2024
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/363753
url http://hdl.handle.net/10261/363753
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/PIE–CSIC–1063 202030E310//
info:eu-repo/grantAgreement/PIE–CSIC–202430E005//
http://dx.doi.org/10.1016/j.marpetgeo.2024.106828
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
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