Pliocene growth of the Dowlatabad syncline in Frontal Fars arc: Folding propagation across the Zagros Fold Belt, Iran

The integration of biostratigraphy, strontium isotope stratigraphy, and magnetostratigraphy allowed for the precise dating of the >3.0-km-thick marine to non-marine foreland sedimentary succession within the Dowlatabad growth syncline along the Frontal Fars arc in the Zagros Fold Belt that extend...

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Autores: Najafi, Mahdi, Beamud, Elisabet, Ruh, Jonas Bruno, Mouthereau, F., Tahmasbi, A., Bernaola, Gilen, Yassaghi, A., Motamedi, H, Sherkati, S., Goodarzi, Mohammad Hassan, Vergés Masip, Jaume
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2020
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/224045
Acesso em linha:http://hdl.handle.net/10261/224045
Access Level:acceso abierto
Palavra-chave:Magnetostratigraphy
Mesopotamian foreland basin
Fold growth
Folding propagation
Numerical modelling
50 Zagros Fold Belt
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network_name_str España
repository_id_str
dc.title.none.fl_str_mv Pliocene growth of the Dowlatabad syncline in Frontal Fars arc: Folding propagation across the Zagros Fold Belt, Iran
title Pliocene growth of the Dowlatabad syncline in Frontal Fars arc: Folding propagation across the Zagros Fold Belt, Iran
spellingShingle Pliocene growth of the Dowlatabad syncline in Frontal Fars arc: Folding propagation across the Zagros Fold Belt, Iran
Najafi, Mahdi
Magnetostratigraphy
Mesopotamian foreland basin
Fold growth
Folding propagation
Numerical modelling
50 Zagros Fold Belt
title_short Pliocene growth of the Dowlatabad syncline in Frontal Fars arc: Folding propagation across the Zagros Fold Belt, Iran
title_full Pliocene growth of the Dowlatabad syncline in Frontal Fars arc: Folding propagation across the Zagros Fold Belt, Iran
title_fullStr Pliocene growth of the Dowlatabad syncline in Frontal Fars arc: Folding propagation across the Zagros Fold Belt, Iran
title_full_unstemmed Pliocene growth of the Dowlatabad syncline in Frontal Fars arc: Folding propagation across the Zagros Fold Belt, Iran
title_sort Pliocene growth of the Dowlatabad syncline in Frontal Fars arc: Folding propagation across the Zagros Fold Belt, Iran
dc.creator.none.fl_str_mv Najafi, Mahdi
Beamud, Elisabet
Ruh, Jonas Bruno
Mouthereau, F.
Tahmasbi, A.
Bernaola, Gilen
Yassaghi, A.
Motamedi, H
Sherkati, S.
Goodarzi, Mohammad Hassan
Vergés Masip, Jaume
author Najafi, Mahdi
author_facet Najafi, Mahdi
Beamud, Elisabet
Ruh, Jonas Bruno
Mouthereau, F.
Tahmasbi, A.
Bernaola, Gilen
Yassaghi, A.
Motamedi, H
Sherkati, S.
Goodarzi, Mohammad Hassan
Vergés Masip, Jaume
author_role author
author2 Beamud, Elisabet
Ruh, Jonas Bruno
Mouthereau, F.
Tahmasbi, A.
Bernaola, Gilen
Yassaghi, A.
Motamedi, H
Sherkati, S.
Goodarzi, Mohammad Hassan
Vergés Masip, Jaume
author2_role author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Economía y Competitividad (España)
Vergés, Jaume [0000-0002-4467-5291]
Beamud, Elisabet [0000-0003-3158-2966]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Magnetostratigraphy
Mesopotamian foreland basin
Fold growth
Folding propagation
Numerical modelling
50 Zagros Fold Belt
topic Magnetostratigraphy
Mesopotamian foreland basin
Fold growth
Folding propagation
Numerical modelling
50 Zagros Fold Belt
description The integration of biostratigraphy, strontium isotope stratigraphy, and magnetostratigraphy allowed for the precise dating of the >3.0-km-thick marine to non-marine foreland sedimentary succession within the Dowlatabad growth syncline along the Frontal Fars arc in the Zagros Fold Belt that extends from eastern Turkey to southern Iran. This area was the missing link to complete the dating of syntectonic deposits in the Fars arc and quantify the migration of sedimentary belts as well as the propagation of folding across the entire Mesopotamian foreland basin. Both are essential for defining the interplay of basin evolution and sequence of folding. Deposition of the foreland marine marls in the Mishan Formation started at ca. 11.5 Ma. The transition to a non-marine basin infill occurred at 4.9 Ma by the progradation of thick fluvial deposits of the Aghajari Formation with a fast accumulation rate of 63 cm/k.y. The beginning of growth strata deposition and thus the onset of folding in the Dowlatabad syncline is dated at 4.65 Ma. The first appearance of carbonate conglomerates sourced from the Guri limestone at 2.8 Ma marked the progressive dismantling of the nearby growing anticlines. The tectonic deformation in the front of the Fars arc was active for at least 2.85 m.y. and ceased at 1.8 Ma before the deposition of the discordant and slightly folded Bakhtyari conglomerates characterized by a clast composition derived from the Zagros hinterland. The compilation of magnetostratigraphic ages reveals that both the migration of the Aghajari-Bakhtyari sedimentary belts and the propagation of the folding front was in-sequence toward the foreland at a rate close to 20 mm/yr in the Fars arc and 15 mm/yr in the Lurestan arc, in the last 20 m.y. These high rates of folding propagation are about one order of magnitude larger than age equivalent shortening rates (∼4 mm/yr in Fars arc and ∼2 mm/yr in Lurestan arc) and thus imply an efficient detachment level at the base of the deformed Arabian sedimentary cover. Numerical experiments on both the cover and basement sequences are designed to test the influence of inherited basement structures on the deformation propagation within the cover sequence, providing clues on the partly coeval in-sequence deformation of the Zagros Simply Folded Belt and the local out-of-sequence Mountain Frontal Fault system as illustrated by regional and local geology.
publishDate 2020
dc.date.none.fl_str_mv 2020
2020
2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/224045
url http://hdl.handle.net/10261/224045
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/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/PIE-CSIC-201530E082
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/PIE-CSIC-201830E039
https://doi.org/10.1130/B35748.1
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Geological Society of America
publisher.none.fl_str_mv Geological Society of America
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
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spelling Pliocene growth of the Dowlatabad syncline in Frontal Fars arc: Folding propagation across the Zagros Fold Belt, IranNajafi, MahdiBeamud, ElisabetRuh, Jonas BrunoMouthereau, F.Tahmasbi, A.Bernaola, GilenYassaghi, A.Motamedi, HSherkati, S.Goodarzi, Mohammad HassanVergés Masip, JaumeMagnetostratigraphyMesopotamian foreland basinFold growthFolding propagationNumerical modelling50 Zagros Fold BeltThe integration of biostratigraphy, strontium isotope stratigraphy, and magnetostratigraphy allowed for the precise dating of the >3.0-km-thick marine to non-marine foreland sedimentary succession within the Dowlatabad growth syncline along the Frontal Fars arc in the Zagros Fold Belt that extends from eastern Turkey to southern Iran. This area was the missing link to complete the dating of syntectonic deposits in the Fars arc and quantify the migration of sedimentary belts as well as the propagation of folding across the entire Mesopotamian foreland basin. Both are essential for defining the interplay of basin evolution and sequence of folding. Deposition of the foreland marine marls in the Mishan Formation started at ca. 11.5 Ma. The transition to a non-marine basin infill occurred at 4.9 Ma by the progradation of thick fluvial deposits of the Aghajari Formation with a fast accumulation rate of 63 cm/k.y. The beginning of growth strata deposition and thus the onset of folding in the Dowlatabad syncline is dated at 4.65 Ma. The first appearance of carbonate conglomerates sourced from the Guri limestone at 2.8 Ma marked the progressive dismantling of the nearby growing anticlines. The tectonic deformation in the front of the Fars arc was active for at least 2.85 m.y. and ceased at 1.8 Ma before the deposition of the discordant and slightly folded Bakhtyari conglomerates characterized by a clast composition derived from the Zagros hinterland. The compilation of magnetostratigraphic ages reveals that both the migration of the Aghajari-Bakhtyari sedimentary belts and the propagation of the folding front was in-sequence toward the foreland at a rate close to 20 mm/yr in the Fars arc and 15 mm/yr in the Lurestan arc, in the last 20 m.y. These high rates of folding propagation are about one order of magnitude larger than age equivalent shortening rates (∼4 mm/yr in Fars arc and ∼2 mm/yr in Lurestan arc) and thus imply an efficient detachment level at the base of the deformed Arabian sedimentary cover. Numerical experiments on both the cover and basement sequences are designed to test the influence of inherited basement structures on the deformation propagation within the cover sequence, providing clues on the partly coeval in-sequence deformation of the Zagros Simply Folded Belt and the local out-of-sequence Mountain Frontal Fault system as illustrated by regional and local geology.This research was funded by the DARIUS Programme as well as the Group of Dynamics of the Lithosphere, Geosciences Barcelona (Geo3BcnConsejo Superior de Investigaciones Científicas (CSIC), Spain. We thank the Paleomagnetic Laboratory Universitat de Barcelona Scientific and Technological Centers-Geo3Bcn, CSIC where the paleomagnetic analyses were conducted, and also the Laboratorio de Geocronología y Geoquímica Isotópica of the Universidad Complutense de Madrid, Spain, where the Sr samples were processed. In addition, the study of calcareous nannofossils was supported by the Research Group of the Basque University System IT-930-16. We are also grateful to the National Iranian Oil Company for their support during fieldwork. We thank DARIUS Programme and its sponsors, and projects Alpimed (PIE-CSIC-201530E082) and Subtetis (PIE-CSIC-201830E039) for additional support.Peer reviewedGeological Society of AmericaMinisterio de Economía y Competitividad (España)Vergés, Jaume [0000-0002-4467-5291]Beamud, Elisabet [0000-0003-3158-2966]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202020202020info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/224045reponame: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/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/PIE-CSIC-201530E082info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/PIE-CSIC-201830E039https://doi.org/10.1130/B35748.1Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2240452026-05-22T06:33:51Z
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