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<datestamp>2018-01-11</datestamp>
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<title lang=en>Deformation of a pervasively molten middle crust: insights from the neoproterozoic Ribeira-Aracuai orogen (SE Brazil)</title>
<creator>Vauchez, Alain</creator>
<creator>Egydio-Silva, M.</creator>
<creator>Babinski, M.</creator>
<creator>Tommasi, Andrea</creator>
<creator>Uhlein, A.</creator>
<creator>Liu, D.</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>Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562 Cidade Universitaria ; Université du Québec</contributor>
<contributor>Instituto de Geociências [Minas Gerais] (IG - UFMG) ; Universidade Federal de Minas Gerais</contributor>
<contributor>Shrimp Laboratory, Institute of Geology, CAGS, Beijing ; Université du Québec</contributor>
<source>ISSN: 0954-4879</source>
<source>EISSN: 1365-3121</source>
<source>Terra Nova</source>
<publisher>Wiley-Blackwell</publisher>
<identifier>hal-00404915</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00404915</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00404915</source>
<source>Terra Nova, Wiley-Blackwell, 2007, 19 (4), pp.278-286. 〈10.1111/j.1365-3121.2007.00747.x〉</source>
<identifier>DOI : 10.1111/j.1365-3121.2007.00747.x</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-3121.2007.00747.x</relation>
<language>en</language>
<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/article</type>
<type>Journal articles</type>
<description lang=en>Pervasive melting of the middle crust, as inferred in Tibet and the Altiplano, probably influences the deformation of the lithosphere. To constrain strain distribution in a pervasively molten crust, we analysed the deformation in an eroded analogue of these orogens. The Ribeira-Araçuaí orogen (SE Brazil) comprises a stack of allochthons containing large volumes of anatectic and magmatic rocks. The upper allochton (∼300 km long, 50–100 km wide and >10 km thick) involves peraluminous diatexites and leucogranites resulting from partial melting of the middle crust. It overlies another allochthon containing huge early- to syn-collisional plutons intruding metasediments. Both anatexites and magmatic intrusions display a pervasive strain-induced magmatic fabric. Homogeneous strain distribution suggests inefficient localization. U–Pb ages of ∼575 Ma imply that anatexite melting was synchronous to the early- to syn-collisional magmatism. Similarity in ages magmatic and solid-state fabrics indicates that intrusions and anatexites deformed coherently with solid-state rocks while still molten, in response to a combination of gravity-driven and collision-driven deformation.</description>
<date>2007</date>
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