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<title lang=en>Oblique contractional reactivation of inherited heterogeneities: Cause for arcuate orogens</title>
<creator>Calignano, Elisa</creator>
<creator>Sokoutis, Dimitrios</creator>
<creator>Willingshofer, E.</creator>
<creator>Brun,, Jean-Pierre</creator>
<creator>Gueydan, Frédéric</creator>
<creator>Cloetingh, S.</creator>
<contributor>Faculty of Geosciences, Utrecht University ; Faculty of Geosciences</contributor>
<contributor>Department of Geosciences [Oslo] ; University of Oslo (UiO)</contributor>
<contributor>Géosciences Rennes (GR) ; Université de Rennes 1 (UR1) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire des Sciences de l'Univers de Rennes (OSUR) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<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>
<description>International audience</description>
<source>ISSN: 0278-7407</source>
<source>Tectonics</source>
<publisher>American Geophysical Union (AGU)</publisher>
<identifier>insu-01498544</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01498544</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01498544/document</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01498544/file/Calignano_et_al-2017-Tectonics.pdf</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-01498544</source>
<source>Tectonics, American Geophysical Union (AGU), 2017, 36 (3), pp.542-558. 〈10.1002/2016TC004424〉</source>
<identifier>DOI : 10.1002/2016TC004424</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1002/2016TC004424</relation>
<language>en</language>
<subject>[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>We use lithospheric-scale analog models to study the reactivation of pre-existing heterogeneities under oblique shortening and its relation to the origin of arcuate orogens. Reactivation of inherited rheological heterogeneities is an important mechanism for localization of deformation in compressional settings and consequent initiation of contractional structures during orogenesis. However, the presence of an inherited heterogeneity in the lithosphere is in itself not sufficient for its reactivation once the continental lithosphere is shortened. The heterogeneity orientation is important in determining if reactivation occurs and to which extent. This study aims at giving insights on this process by means of analog experiments in which a linear lithospheric heterogeneity trends with various angles to the shortening direction. In particular, the key parameter investigated is the orientation (angle α) of a strong domain (SD) with respect to the shortening direction. Experimental results show that angles α ≥ 75° (high obliquity) allow for reactivation along the entire SD and the development of a linear orogen. For α ≤ 60° (low obliquity) the models are characterized by the development of an arcuate orogen, with the SD remaining partially non-reactivated. These results provide a new mechanism for the origin of some arcuate orogens, in which orocline formation was not driven by indentation or subduction processes, but by oblique shortening of inherited heterogeneities, as exemplified by the Ouachita orogen of the southern U.S.</description>
<date>2017</date>
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