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<title lang=en>Melilite-bearing lavas in Mayotte (France): An insight into the mantle source below the Comores</title>
<creator>Pelleter, Anne-Aziliz</creator>
<creator>Caroff, Martial</creator>
<creator>Cordier, Carole</creator>
<creator>Bachèlery, Patrick</creator>
<creator>Nehlig, Pierre</creator>
<creator>Debeuf, Delphine</creator>
<creator>Arnaud, Nicolas</creator>
<contributor>Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) ; Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) - Institut national des sciences de l'Univers (INSU - CNRS) - Université d'Orléans (UO) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Domaines Océaniques (LDO) ; Centre National de la Recherche Scientifique (CNRS) - Institut d'écologie et environnement - Observatoire des Sciences de l'Univers - Université de Brest (UBO) - Institut national des sciences de l'Univers (INSU - CNRS)</contributor>
<contributor>Institut des Sciences de la Terre (ISTerre) ; Université Joseph Fourier - Grenoble 1 (UJF) - Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR) - Institut national des sciences de l'Univers (INSU - CNRS) - Institut de recherche pour le développement [IRD] : UR219 - PRES Université de Grenoble - Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire Magmas et Volcans (LMV) ; Université Blaise Pascal - Clermont-Ferrand 2 (UBP) - Institut national des sciences de l'Univers (INSU - CNRS) - Université Jean Monnet [Saint-Étienne] (UJM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)</contributor>
<contributor>Laboratoire GéoSciences Réunion (LGSR) ; Université de la Réunion (UR) - Institut de Physique du Globe de Paris</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: 0024-4937</source>
<source>Lithos</source>
<publisher>Elsevier</publisher>
<identifier>insu-01089376</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01089376</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01089376/document</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01089376/file/Pelleter%20et%20al%201.pdf</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-01089376</source>
<source>Lithos, Elsevier, 2014, 208-209, pp.281-297. 〈10.1016/j.lithos.2014.09.012〉</source>
<identifier>DOI : 10.1016/j.lithos.2014.09.012</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.lithos.2014.09.012</relation>
<language>en</language>
<subject lang=en>Olivine melilitite</subject>
<subject lang=en>Ocean island basalts</subject>
<subject lang=en>Mantle heterogeneity</subject>
<subject lang=en>HIMU</subject>
<subject lang=en>Comores</subject>
<subject lang=en>isotopic composition</subject>
<subject lang=en>igneous geochemistry</subject>
<subject lang=en>lava</subject>
<subject lang=en>mantle source</subject>
<subject lang=en>continental breakup</subject>
<subject lang=en>concentration (composition)</subject>
<subject lang=en>continental lithosphere</subject>
<subject lang=en>partial melting</subject>
<subject lang=en>ocean island basalt</subject>
<subject lang=en>metasomatism</subject>
<subject lang=en>melilite</subject>
<subject lang=en>silica</subject>
<subject lang=en>trace element</subject>
<subject lang=en>basanite</subject>
<subject>[SDU.STU.PE] Sciences of the Universe [physics]/Earth Sciences/Petrography</subject>
<subject>[SDU.STU.MI] Sciences of the Universe [physics]/Earth Sciences/Mineralogy</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Ocean island basalts (OIB) from the Comores archipelago (Indian Ocean) display mineralogical and geochemical features different from the other Indian OIB. We present here new geochronological data (40Ar/39Ar), major and trace element compositions and isotopic (Sr, Nd, Pb) ratios of silica-undersaturated alkaline rocks from Mayotte, the oldest island of the Comores. Two trends are defined using major element composition: (1) a highly silica-undersaturated trend which includes basanites, (melilite-bearing) nephelinites, intermediate lavas and phonolites from the southern part of the island and (2) a moderately silica-undersaturated trend which is mainly represented by alkali basalts, basanites, intermediate lavas and phonolites from the northern part of the island. Both trends could be explained, to some extent, by variable degrees of partial melting. Normative larnite-bearing olivine melilitites and nephelinites exhibit, in addition to their high silica-undersaturation, elevated concentrations in CaO (>12wt.%) and P2O5 (up to 1.35wt.%). These exceptional rocks would result from low degree deep partial melting of a CO2-metasomatized source in the presence of carbonate (probably dolomite) and apatite. Igneous rocks from southern and northwestern shield volcanoes are characterized by a radiogenic Pb composition, revealing the existence of a HIMU (high μ=238U/204Pb) component in their source. Its influence decreases from the main building stage (>10.6-~3.0Ma) to the post-shield stage for the benefit of a depleted MORB-mantle (DMM) component, especially in the north central rocks. This feature would reflect increasing melting degrees of the depleted dominant source, bearing small-scale HIMU heterogeneities progressively consumed with time. The HIMU signature might have been introduced in the Comorian lithospheric mantle by thermal erosion or delamination of a continental lithosphere during the Gondwana break-up. The other islands of the Comores archipelago (Moheli, Anjouan and "La Grille" type lavas from Grande Comore) display also a DMM-HIMU mixing trend. Only a few lavas from Grande Comore ("Karthala" type) and one sample from Mayotte show the clear EM1 contribution (87Sr/86Sr>0.7035) of the Comorian plume.</description>
<date>2014-11-01</date>
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