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<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>Strain distribution across a partially molten middle crust: Insights from the AMS mapping of the Carlos Chagas Anatexite, Araçuaí belt (East Brazil)</title>
<creator>Cavalcante, Geane C.G.</creator>
<creator>Egydio-Silva, M.</creator>
<creator>Vauchez, Alain</creator>
<creator>Camps, Pierre</creator>
<creator>Oliveiraa, Euridice</creator>
<contributor>Instituto de Geociências, Universidade de São Paulo ; Université du Québec</contributor>
<contributor>Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562 Cidade Universitaria ; Université du Québec</contributor>
<contributor>Manteau et Interfaces ; 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) - 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: 0191-8141</source>
<source>Journal of Structural Geology</source>
<publisher>Elsevier</publisher>
<identifier>hal-00903878</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00903878</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00903878</source>
<source>Journal of Structural Geology, Elsevier, 2013, 55, pp.79-100. 〈10.1016/j.jsg.2013.08.001〉</source>
<identifier>DOI : 10.1016/j.jsg.2013.08.001</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsg.2013.08.001</relation>
<language>en</language>
<subject lang=en>Magmatic flow</subject>
<subject lang=en>Araçuaí belt</subject>
<subject lang=en>Anisotropy of magnetic susceptibility</subject>
<subject lang=en>Crystallographic preferred orientation</subject>
<subject lang=en>Anatexites</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<subject>[PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The easternmost part of the Neoproterozoic Araçuaí belt comprises an anatectic domain that involves anatexites (the Carlos Chagas unit), leucogranites and migmatitic granulites that display a well-developed fabric. Microstructural observations support that the deformation occurred in the magmatic to submagmatic state. Structural mapping integrating field and anisotropy of magnetic susceptibility (AMS) revealed a complex, 3D structure. The northern domain displays gently dipping foliations bearing a NW-trending lineation, southward, the lineation trend progressively rotates to EW then SW and the foliation is gently folded. The eastern domain displays E-W and NE-SW trending foliations with moderate to steeply dips bearing a dominantly NS trending lineation. Magnetic mineralogy investigation suggests biotite as the main carrier of the magnetic susceptibility in the anatexites and ferromagnetic minerals in the granulites. Crystallographic preferred orientation (CPO) measurements using the electron backscatter diffraction (EBSD) technique suggest that the magnetic fabric comes from the crystalline anisotropy of biotite and feldspar grains, especially. The delineation of several structural domains with contrasted flow fabric suggests a 3D flow field involving westward thrusting orthogonal to the belt, northwestward orogen-oblique escape tectonics and NS orogen-parallel flow. This complex deformation pattern may be due to interplay of collision-driven and gravity-driven deformations.</description>
<date>2013-10-01</date>
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