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<title lang=en>Dehydration, melting and related garnet growth in the deep root of the Amalaoulaou Neoproterozoic magmatic arc (Gourma, NE Mali)</title>
<creator>Berger, J.</creator>
<creator>Caby, Renaud</creator>
<creator>Liegeois, J. P.</creator>
<creator>Mercier, J. C. C.</creator>
<creator>Demaiffe, D.</creator>
<contributor>Musée royal de l'Afrique centrale, Section de géologie isotopique, Tervuren ; Université du Québec</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>
<contributor>LIttoral ENvironnement et Sociétés - UMR 7266 (LIENSs) ; Université de La Rochelle (ULR) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire de Planétologie et Géodynamique de Nantes (LPGN) ; Université de Nantes (UN) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0016-7568</source>
<source>EISSN: 1469-5081</source>
<source>Geological Magazine</source>
<publisher>Cambridge University Press (CUP)</publisher>
<identifier>hal-00420960</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00420960</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00420960</source>
<source>Geological Magazine, Cambridge University Press (CUP), 2009, 146 (2), pp.173-186. 〈10.1017/S0016756808005499〉</source>
<identifier>DOI : 10.1017/S0016756808005499</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1017/S0016756808005499</relation>
<language>en</language>
<subject lang=en>Gourma</subject>
<subject lang=en>dehydration-melting</subject>
<subject lang=en>island arc</subject>
<subject lang=en>Neoproterozoic</subject>
<subject lang=en>granulite</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/article</type>
<type>Journal articles</type>
<description lang=en>The Amalaoulaou Neoproterozoic island-arc massif belongs to the Gourma belt in Mali. The metagabbros and pyroxenites forming the main body of this arc root show the pervasive development of garnet. In the pyroxenites, the latter has grown by reaction between pyroxene and spinel during isobaric cooling. By contrast, in the metagabbros, garnet textures and relations to felsic veins exclude an origin through solid-state reactions only. It is proposed that garnet has grown following dehydration and localized melting of amphibole-bearing gabbros at the base of the arc. The plagioclase-saturated melts represented by anorthositic veins in the metagabbros and by trondhjemites in the upper part of the massif provide evidence for melting in the deep arc crust, which locally generated high-density garnet clinopyroxene rutile residues. Garnet growth and melting began around 850 degrees C at 10 kbar and the tonalitic melts were most probably generated around 1050 degrees C at P >= 10 kbar. This HT granulitic imprint can be related to arc maturation, leading to a P-T increase in the deep arc root and dehydration and/or dehydration-melting of amphibole-bearing gabbros. Observation of such features in the root of this Neoproterozoic island arc has important consequences, as it provides a link to models concerning the early generation of continental crust.</description>
<date>2009</date>
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