Late Miocene deformation kinematics along the NW Zagros fold-thrust belt, Kurdistan Region of Iraq

Apatite (U-Th)/He (AHe) thermochronometric results are integrated with geologic cross sections, structural relationships, and stratigraphic data to reconstruct the growth of the NW Zagros orogenic belt in the Kurdistan region of Iraq. Prolonged exhumation is documented across the belt with deformati...

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Autores: Koshnaw, Renas I.|||0000-0002-3838-2388, Stockli, Daniel F.|||0000-0001-7652-2129, Horton, Brian K.|||0000-0002-1402-3524, Teixell, Antonio|||0000-0002-7423-6361, Barber, Douglas R.|||0000-0001-6950-3456, Kendall, Jerome J.|||0000-0001-6382-4435
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:321119
Acceso en línea:https://ddd.uab.cat/record/321119
https://dx.doi.org/urn:doi:10.1029/2019TC005865
Access Level:acceso abierto
Palabra clave:Zagros
Fold-thrust belt
Thermochronology
Thin-skinned versus thick-skinned
Out-of-sequence
Slab breakoff
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spelling Late Miocene deformation kinematics along the NW Zagros fold-thrust belt, Kurdistan Region of Iraqconstraints from apatite (U-Th)/He thermochronometry and balanced cross xectionsKoshnaw, Renas I.|||0000-0002-3838-2388Stockli, Daniel F.|||0000-0001-7652-2129Horton, Brian K.|||0000-0002-1402-3524Teixell, Antonio|||0000-0002-7423-6361Barber, Douglas R.|||0000-0001-6950-3456Kendall, Jerome J.|||0000-0001-6382-4435ZagrosFold-thrust beltThermochronologyThin-skinned versus thick-skinnedOut-of-sequenceSlab breakoffApatite (U-Th)/He (AHe) thermochronometric results are integrated with geologic cross sections, structural relationships, and stratigraphic data to reconstruct the growth of the NW Zagros orogenic belt in the Kurdistan region of Iraq. Prolonged exhumation is documented across the belt with deformation advances and retreats from ~14 Ma onward. After in-sequence propagation of deformation during middle to late Miocene times, preserved growth strata and AHe data show a deformation retreat by latest Miocene time (~5 Ma). In the NW Zagros, the Phanerozoic succession contains two principal décollements in Lower Triassic and middle Miocene units. The Triassic strata are interpreted as the main décollement for a thin-skinned system that was dominant during most of the Cenozoic. By ~8-5 Ma, the fold-thrust belt shifted to basement-involved deformation in association with growth of the mountain front flexure and reactivation of frontal structures. The shift from thin-skinned to a hybrid thin- and thick-skinned mode of shortening may reflect variations in the mechanical behavior of the upper crust and the presence of inherited basement discontinuities. On the basis of two NE-SW balanced cross sections spanning the NW Zagros, the estimated total minimum horizontal shortening is ~18.2 km (6%) in the central and ~16 km (7%) in the southern sectors of the Kurdistan region of Iraq. These findings suggest that the evolution of the NW Zagros orogenic belt was likely driven by the mechanical stratigraphy of the sedimentary cover, inherited basement discontinuities, and the dynamic and thermomechanical effects of potential slab breakoff and lithospheric mantle delamination events. 22020-01-0120202020-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/321119https://dx.doi.org/urn:doi:10.1029/2019TC005865reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.https://rightsstatements.org/vocab/InC/1.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:3211192026-06-06T12:50:31Z
dc.title.none.fl_str_mv Late Miocene deformation kinematics along the NW Zagros fold-thrust belt, Kurdistan Region of Iraq
constraints from apatite (U-Th)/He thermochronometry and balanced cross xections
title Late Miocene deformation kinematics along the NW Zagros fold-thrust belt, Kurdistan Region of Iraq
spellingShingle Late Miocene deformation kinematics along the NW Zagros fold-thrust belt, Kurdistan Region of Iraq
Koshnaw, Renas I.|||0000-0002-3838-2388
Zagros
Fold-thrust belt
Thermochronology
Thin-skinned versus thick-skinned
Out-of-sequence
Slab breakoff
title_short Late Miocene deformation kinematics along the NW Zagros fold-thrust belt, Kurdistan Region of Iraq
title_full Late Miocene deformation kinematics along the NW Zagros fold-thrust belt, Kurdistan Region of Iraq
title_fullStr Late Miocene deformation kinematics along the NW Zagros fold-thrust belt, Kurdistan Region of Iraq
title_full_unstemmed Late Miocene deformation kinematics along the NW Zagros fold-thrust belt, Kurdistan Region of Iraq
title_sort Late Miocene deformation kinematics along the NW Zagros fold-thrust belt, Kurdistan Region of Iraq
dc.creator.none.fl_str_mv Koshnaw, Renas I.|||0000-0002-3838-2388
Stockli, Daniel F.|||0000-0001-7652-2129
Horton, Brian K.|||0000-0002-1402-3524
Teixell, Antonio|||0000-0002-7423-6361
Barber, Douglas R.|||0000-0001-6950-3456
Kendall, Jerome J.|||0000-0001-6382-4435
author Koshnaw, Renas I.|||0000-0002-3838-2388
author_facet Koshnaw, Renas I.|||0000-0002-3838-2388
Stockli, Daniel F.|||0000-0001-7652-2129
Horton, Brian K.|||0000-0002-1402-3524
Teixell, Antonio|||0000-0002-7423-6361
Barber, Douglas R.|||0000-0001-6950-3456
Kendall, Jerome J.|||0000-0001-6382-4435
author_role author
author2 Stockli, Daniel F.|||0000-0001-7652-2129
Horton, Brian K.|||0000-0002-1402-3524
Teixell, Antonio|||0000-0002-7423-6361
Barber, Douglas R.|||0000-0001-6950-3456
Kendall, Jerome J.|||0000-0001-6382-4435
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Zagros
Fold-thrust belt
Thermochronology
Thin-skinned versus thick-skinned
Out-of-sequence
Slab breakoff
topic Zagros
Fold-thrust belt
Thermochronology
Thin-skinned versus thick-skinned
Out-of-sequence
Slab breakoff
description Apatite (U-Th)/He (AHe) thermochronometric results are integrated with geologic cross sections, structural relationships, and stratigraphic data to reconstruct the growth of the NW Zagros orogenic belt in the Kurdistan region of Iraq. Prolonged exhumation is documented across the belt with deformation advances and retreats from ~14 Ma onward. After in-sequence propagation of deformation during middle to late Miocene times, preserved growth strata and AHe data show a deformation retreat by latest Miocene time (~5 Ma). In the NW Zagros, the Phanerozoic succession contains two principal décollements in Lower Triassic and middle Miocene units. The Triassic strata are interpreted as the main décollement for a thin-skinned system that was dominant during most of the Cenozoic. By ~8-5 Ma, the fold-thrust belt shifted to basement-involved deformation in association with growth of the mountain front flexure and reactivation of frontal structures. The shift from thin-skinned to a hybrid thin- and thick-skinned mode of shortening may reflect variations in the mechanical behavior of the upper crust and the presence of inherited basement discontinuities. On the basis of two NE-SW balanced cross sections spanning the NW Zagros, the estimated total minimum horizontal shortening is ~18.2 km (6%) in the central and ~16 km (7%) in the southern sectors of the Kurdistan region of Iraq. These findings suggest that the evolution of the NW Zagros orogenic belt was likely driven by the mechanical stratigraphy of the sedimentary cover, inherited basement discontinuities, and the dynamic and thermomechanical effects of potential slab breakoff and lithospheric mantle delamination events.
publishDate 2020
dc.date.none.fl_str_mv 2
2020-01-01
2020
2020-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/321119
https://dx.doi.org/urn:doi:10.1029/2019TC005865
url https://ddd.uab.cat/record/321119
https://dx.doi.org/urn:doi:10.1029/2019TC005865
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://rightsstatements.org/vocab/InC/1.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://rightsstatements.org/vocab/InC/1.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
reponame_str Dipòsit Digital de Documents de la UAB
collection Dipòsit Digital de Documents de la UAB
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