Multidetachment analogue models of fold reactivation in transpression: The NW Persian Gulf

Two deformation events have been documented in the NW Persian Gulf during the Late Cretaceous and the Late Cenozoic. The most distinctive feature in this part of the Persian Gulf is the reactivation of the Late Cretaceous NNE-SSW Arabian trending folds by NE-SW shortening during the Late Cenozoic Za...

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Authors: Soleimany, B., Nalpas, Thierry, Sàbat i Montserrat, Francesc
Format: article
Status:Published version
Publication Date:2013
Country:España
Institution:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repository:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/109048
Online Access:https://hdl.handle.net/2445/109048
Access Level:Open access
Keyword:Tectònica
Pèrsic, Golf
Tectonics
Persian Gulf
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spelling Multidetachment analogue models of fold reactivation in transpression: The NW Persian GulfSoleimany, B.Nalpas, ThierrySàbat i Montserrat, FrancescTectònicaPèrsic, GolfTectonicsPersian GulfTwo deformation events have been documented in the NW Persian Gulf during the Late Cretaceous and the Late Cenozoic. The most distinctive feature in this part of the Persian Gulf is the reactivation of the Late Cretaceous NNE-SSW Arabian trending folds by NE-SW shortening during the Late Cenozoic Zagros Orogeny. In general, if a set of folds with horizontal axes is shortened roughly parallel to its fold axis, a dome-basin fold interference pattern is produced. In the NW Persian Gulf, reactivation of some old folds occurred instead of a fold interference pattern. Reactivation may be influenced by the following factors: 1) the presence of incompetent layers (i.e. evaporites), 2) a variable overburden, 3) basement faults, and 4) obliquity between the younger deformation shortening axis and fold axis. It is this later factor that we investigated by means of analogue modelling. The experimental apparatus is similar to that commonly used for experiments with brittle-ductile systems at the Laboratory of Experimental Tectonics of Géosciences Rennes. The model consisted of an alternation of ductile and brittle horizontal layers with a stratigraphy similar to the one found in the NW Persian Gulf. The model was deformed by two deformation events with an angle α between the two directions of shortening. After deformation, the resulting structure resembled a fold facing the static wall with internal thrust faults and detachment faults arranged into a geometry similar to a fish-tail. In the second shortening event, the fold was reactivated without formation of an interference pattern. Moreover, the displacement on both the reactivated and newly formed faults varied between almost pure thrust faults for low α and oblique thrust faults with a strike-slip component for high α. The models suggest that the presence of incompetent layers plays an important role in fold reactivation and confirm that basement faults are not necessary.(UB). (ICTJA). (IDEA). (UAB). (CSIC)2017201720132017info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion12 p.application/pdfapplication/pdfhttps://hdl.handle.net/2445/109048Articles 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)InglésReproducció del document publicat a: https://doi.org/10.1344/105.000001870Geologica Acta, 2013, vol. 11, num. 3, p. 265-276https://doi.org/10.1344/105.000001870cc-by-sa (c) Soleimany, B. et al., 2013http://creativecommons.org/licenses/by-sa/3.0/esinfo:eu-repo/semantics/openAccessoai:recercat.cat:2445/1090482026-05-29T05:05:01Z
dc.title.none.fl_str_mv Multidetachment analogue models of fold reactivation in transpression: The NW Persian Gulf
title Multidetachment analogue models of fold reactivation in transpression: The NW Persian Gulf
spellingShingle Multidetachment analogue models of fold reactivation in transpression: The NW Persian Gulf
Soleimany, B.
Tectònica
Pèrsic, Golf
Tectonics
Persian Gulf
title_short Multidetachment analogue models of fold reactivation in transpression: The NW Persian Gulf
title_full Multidetachment analogue models of fold reactivation in transpression: The NW Persian Gulf
title_fullStr Multidetachment analogue models of fold reactivation in transpression: The NW Persian Gulf
title_full_unstemmed Multidetachment analogue models of fold reactivation in transpression: The NW Persian Gulf
title_sort Multidetachment analogue models of fold reactivation in transpression: The NW Persian Gulf
dc.creator.none.fl_str_mv Soleimany, B.
Nalpas, Thierry
Sàbat i Montserrat, Francesc
author Soleimany, B.
author_facet Soleimany, B.
Nalpas, Thierry
Sàbat i Montserrat, Francesc
author_role author
author2 Nalpas, Thierry
Sàbat i Montserrat, Francesc
author2_role author
author
dc.subject.none.fl_str_mv Tectònica
Pèrsic, Golf
Tectonics
Persian Gulf
topic Tectònica
Pèrsic, Golf
Tectonics
Persian Gulf
description Two deformation events have been documented in the NW Persian Gulf during the Late Cretaceous and the Late Cenozoic. The most distinctive feature in this part of the Persian Gulf is the reactivation of the Late Cretaceous NNE-SSW Arabian trending folds by NE-SW shortening during the Late Cenozoic Zagros Orogeny. In general, if a set of folds with horizontal axes is shortened roughly parallel to its fold axis, a dome-basin fold interference pattern is produced. In the NW Persian Gulf, reactivation of some old folds occurred instead of a fold interference pattern. Reactivation may be influenced by the following factors: 1) the presence of incompetent layers (i.e. evaporites), 2) a variable overburden, 3) basement faults, and 4) obliquity between the younger deformation shortening axis and fold axis. It is this later factor that we investigated by means of analogue modelling. The experimental apparatus is similar to that commonly used for experiments with brittle-ductile systems at the Laboratory of Experimental Tectonics of Géosciences Rennes. The model consisted of an alternation of ductile and brittle horizontal layers with a stratigraphy similar to the one found in the NW Persian Gulf. The model was deformed by two deformation events with an angle α between the two directions of shortening. After deformation, the resulting structure resembled a fold facing the static wall with internal thrust faults and detachment faults arranged into a geometry similar to a fish-tail. In the second shortening event, the fold was reactivated without formation of an interference pattern. Moreover, the displacement on both the reactivated and newly formed faults varied between almost pure thrust faults for low α and oblique thrust faults with a strike-slip component for high α. The models suggest that the presence of incompetent layers plays an important role in fold reactivation and confirm that basement faults are not necessary.
publishDate 2013
dc.date.none.fl_str_mv 2013
2017
2017
2017
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/109048
url https://hdl.handle.net/2445/109048
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1344/105.000001870
Geologica Acta, 2013, vol. 11, num. 3, p. 265-276
https://doi.org/10.1344/105.000001870
dc.rights.none.fl_str_mv cc-by-sa (c) Soleimany, B. et al., 2013
http://creativecommons.org/licenses/by-sa/3.0/es
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by-sa (c) Soleimany, B. et al., 2013
http://creativecommons.org/licenses/by-sa/3.0/es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 12 p.
application/pdf
application/pdf
dc.publisher.none.fl_str_mv (UB). (ICTJA). (IDEA). (UAB). (CSIC)
publisher.none.fl_str_mv (UB). (ICTJA). (IDEA). (UAB). (CSIC)
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 15,198674

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