Morocco): Clues from Trace Elements and Sr–Nd–Pb–Hf Isotopes
Lithos 205 (2014) 247–265 Contents lists available at ScienceDirect Lithos journal homepage: www.elsevier.com/locate/lithos Lithospheric origin for Neogene–Quaternary Middle Atlas lavas (Morocco): Clues from trace elements and Sr–Nd–Pb–Hf isotopes Delphine Bosch a,⁎, René C. Maury b,M'hammedElAzzouzib,c,ClaireBollingerd, Hervé Bellon b, Patrick Verdoux e a UMR-UM2-CNRS 5243 Géosciences Montpellier, Université de Montpellier II, place E. Bataillon, c.c. 060, 34095 Montpellier, France b UMR-CNRS 6538 Domaines océaniques, Institut Universitaire Européen de la Mer (IUEM), IUEM, Université de Brest, Université Européenne de Bretagne, place Nicolas Copernic, 29280 Plouzané, France c Faculté des Sciences, Université Mohammed-V, av. Ibn Batouta, BP 1014, 10100 Rabat, Maroc d UMS-CNRS 3113 Pôle de spectrométrie océan, IUEM, Université de Brest, Université Européenne de Bretagne, place Nicolas Copernic, 29280 Plouzané, France e Laboratoire de Géochimie Isotopique environnementale, Université de Nîmes/Site GIS, UMR-CNRS 7330, rue Georges Besse, 30035 Nîmes Cedex 1, France article info abstract Article history: This study presents new geochemical data on 26 mafic lavas from the Middle Atlas and Central Morocco volcanic Received 17 April 2014 provinces, including Miocene nephelinites and Pliocene–Quaternary (3.9–0.6 Ma) nephelinites, basanites, alkali Accepted 11 July 2014 and subalkaline basalts. Most of them represent near-primary magmas, although some alkali basalts were derived Available online 21 July 2014 from the minor fractionation of olivine and diopside phenocrysts. These evolved samples and the subalkaline basalt display higher 207Pb/204Pb and Zr/Nb ratios and lower εNd consistent with their contamination by lower crustal Keywords: Intraplate alkali basalts granulites during an open fractionation process.
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