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<title lang=en>New magnetic fabric data and their comparison with palaeostress markers in the Western Fars Arc (Zagros, Iran): tectonic implications</title>
<creator>Aubourg, Charles</creator>
<creator>Smith, Brigitte</creator>
<creator>Eshraghi, Ali</creator>
<creator>Lacombe, Olivier</creator>
<creator>Authemayou, Christine</creator>
<creator>Amrouch, Khaled</creator>
<creator>Bellier, Olivier</creator>
<creator>Mouthereau, Frédéric</creator>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Geological Survey of Iran, Tehran ; Université du Québec</contributor>
<contributor>Institut des Sciences de la Terre de Paris (iSTeP) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Domaines Océaniques (LDO) ; Centre National de la Recherche Scientifique (CNRS) - Institut d'écologie et environnement - Observatoire des Sciences de l'Univers - Université de Brest (UBO) - Institut national des sciences de l'Univers (INSU - CNRS)</contributor>
<contributor>Centre européen de recherche et d'enseignement de géosciences de l'environnement (CEREGE) ; Institut de Recherche pour le Développement (IRD) - Aix Marseille Université (AMU) - Collège de France (CdF) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<source>Tectonic and stratigraphic evolution of Zagros and Makran during the Mesozoic-Cenozoic</source>
<contributor>P. Leturmy; C. Robin</contributor>
<publisher>Geological Society of London</publisher>
<identifier>hal-00545036</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00545036</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00545036</source>
<source>P. Leturmy; C. Robin. Tectonic and stratigraphic evolution of Zagros and Makran during the Mesozoic-Cenozoic, Geological Society of London, pp.97-120, 2010, Geological Society Special Publication, 330, 〈10.1144/SP330.6〉</source>
<identifier>DOI : 10.1144/SP330.6</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1144/SP330.6</relation>
<language>en</language>
<subject lang=en>Western Fars Arc</subject>
<subject lang=en>Zagros</subject>
<subject lang=en>Iran</subject>
<subject lang=en>palaeostress markers</subject>
<subject>[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/bookPart</type>
<type>Book sections</type>
<description lang=en>The Zagros Simply Folded Belt (ZSFB) is an active fold-and-thrust belt resulting from the still continuing continental collision between the Arabian plate and the Iranian plate, which probably started in the Oligocene. The present-day shortening (N25°) is well documented by focal mechanisms of earthquakes and global positioning system (GPS) surveys. We propose in this study a comparison of published palaeostress markers, including magnetic fabric, brittle deformation and calcite twinning data. In addition, we describe the magnetic fabric from Palaeocene carbonates (10 sites) and Mio-Pliocene clastic deposits (15 sites). The magnetic fabrics are intermediate, with magnetic foliation parallel to the bedding, and a magnetic lineation mostly at right angles to the shortening direction. This suggests that the magnetic fabric retains the record of an early layer-parallel shortening (LPS) that occurred prior to folding. The record of LPS allows the identification of originally oblique folds such as the Mand Fold, which have developed in front of the Kazerun Fault. The shape parameter of the magnetic fabric indicates a weak strain compatible with the development of detachment folds in the ZSFB. The palaeostress datasets, covering the Palaeocene to Pleistocene time interval, support several folding episodes accompanied by a counter-clockwise rotation of the stress field direction. The Palaeocene carbonates in the ZSFB record a N47 LPS during early to middle Miocene detachment folding in the High Zagros Belt (HZB). The Mio-Pliocene clastic deposits recorded a N38 LPS prior to and during detachment folding within the ZSFB at the end of the Miocene-Pliocene. Similarly, fault slip and calcite twin data from the ZSFB also support a counter-clockwise rotation from NE to N20 between the pre-folding stage and the late rejuvenation of folds. This counter-clockwise trend of palaeostress data agrees with fault slip data from the HZB. During the late stage of folding in the ZSFB, the Plio-Quaternary palaeostress trends are consistently parallel to the present-day shortening direction.</description>
<date>2010-06-01</date>
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