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<title lang=en>Discovery of an albite gneiss from the Ile de Groix (Armorican Massif, France): geochemistry and LA-ICP-MS U-Pb geochronology of its Ordovician protolith</title>
<creator>El Korh, Alifé</creator>
<creator>Schmidt, Susanne, </creator>
<creator>Ballevre, Michel</creator>
<creator>Ulianov, Alexey</creator>
<creator>Bruguier, Olivier</creator>
<contributor>Department of Mineralogy ; University of Geneva [Switzerland]</contributor>
<contributor>Terre, Temps, Traçage ; 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) - 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>Institute of Mineralogy and Geochemistry ; University of Lausanne</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: 1437-3254</source>
<source>EISSN: 1437-3262</source>
<source>International Journal of Earth Sciences</source>
<publisher>Springer Verlag</publisher>
<identifier>insu-00714570</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-00714570</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-00714570</source>
<source>International Journal of Earth Sciences, Springer Verlag, 2012, 101 (5), pp.1169-1190. 〈10.1007/s00531-011-0732-5〉</source>
<identifier>DOI : 10.1007/s00531-011-0732-5</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1007/s00531-011-0732-5</relation>
<language>en</language>
<subject lang=it>Cambro-Ordovician rifting</subject>
<subject lang=it>Ile de Groix</subject>
<subject lang=it>Incompatible trace elements</subject>
<subject lang=it>In situ U-Pb geochronology</subject>
<subject lang=it>LA-ICP-MS</subject>
<subject lang=it>Albite orthogneiss</subject>
<subject lang=it>Titanite</subject>
<subject lang=it>Variscan orogeny</subject>
<subject lang=it>Zircon</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>For the first time, an albite orthogneiss has been recognised and dated within the HP-LT blueschist facies metabasites and metapelites of the Ile de Groix. It is characterised by a peraluminous composition, high LILE, Th and U contents, MORB-like HREE abundances and moderate Nb and Y values. A U-Pb age of 480.8 ± 4.8 Ma was obtained by LA-ICP-MS dating of zircon and titanite. It is interpreted as the age of the magmatic emplacement during the Early Ordovician. Morphologically different zircon grains yield late Neoproterozoic ages of 546.6-647.4 Ma. Zircon and titanite U-Pb ages indicate that the felsic magmatism from the Ile de Groix is contemporaneous with the acid, pre-orogenic magmatism widely recognised in the internal zones of the Variscan belt, related to the Cambro-Ordovician continental rifting. The magmatic protolith probably inherited a specific chemical composition from a combination of orogenic, back-arc and anorogenic signatures because of partial melting of the Cadomian basement during magma emplacement. Besides, the late Devonian U-Pb age of 366 ± 33 Ma obtained for titanite from a blueschist facies metapelite corresponds to the age of the HP-LT peak metamorphism.</description>
<date>2012</date>
</dc>
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