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...
| Autores: | , , , , , |
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| 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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oai:ddd.uab.cat:321119 |
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España |
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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 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 Zagros Fold-thrust belt Thermochronology Thin-skinned versus thick-skinned Out-of-sequence Slab breakoff 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. https://ddd.uab.cat/record/321119 https://dx.doi.org/urn:doi:10.1029/2019TC005865 |
| 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 |
| 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 |
| topic |
Zagros Fold-thrust belt Thermochronology Thin-skinned versus thick-skinned Out-of-sequence Slab breakoff |
| topic_facet |
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 |
| format |
article |
| url |
https://ddd.uab.cat/record/321119 https://dx.doi.org/urn:doi:10.1029/2019TC005865 |
| language |
eng |
| eu_rights_str_mv |
openAccess |
| institution |
Universitat Autònoma de Barcelona |
| collection |
Dipòsit Digital de Documents de la UAB |
| reponame_str |
Dipòsit Digital de Documents de la UAB |
| instname_str |
Universitat Autònoma de Barcelona |
| _version_ |
1878739222828941312 |
| publishDateSort |
2020 |
| author_browse |
Barber, Douglas R.|||0000-0001-6950-3456 Horton, Brian K.|||0000-0002-1402-3524 Kendall, Jerome J.|||0000-0001-6382-4435 Koshnaw, Renas I.|||0000-0002-3838-2388 Stockli, Daniel F.|||0000-0001-7652-2129 Teixell, Antonio|||0000-0002-7423-6361 |
| score |
6,8972664 |