The Neoproterozoic volcanic complex of the Boumalne inlier (Saghro massif,Eastern Anti-Atlas; Morocco): petrological and geochemical characteristics |
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| Authors: | Rachida Bendaoud M’hamed El Janati Mohamed Elaatmani Luisa Carvalho Zaineb Hajjar Said Ilmen Abdallah Algouti Ahmed Algouti Lahcen Khouchaf |
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| Institution: | 1.Laboratory of ESMIA, Faculty of Sciences,Cadi Ayyad University,Marrakech,Morocco;2.Laboratory of GEOBASSMA, Faculty of Sciences,Cadi Ayyad University,Marrakech,Morocco;3.Department of Geology, Faculty of Sciences,Mohamed V University,Rabat,Morocco;4.Atomic Physics Centre,University of Lisbon,Lisbon,Portugal;5.DLGR Laboratory, Department of Geology, Faculty of Science Semlalia,Cadi Ayyad University,Marrakech,Morocco;6.Managem Group,Twin Center,Casablanca,Morocco;7.Ecole des Mines de Douai,Douai,France |
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| Abstract: | Neoproterozoic volcanic series are exposed in the northern edge of the Saghro massif (Eastern Anti-Atlas, Morocco). Four volcanic rock types (basalt, andesite, dacite, and rhyolite) were distinguished in the Boumalne inlier within the so-called Saghro volcanic sequences based on petrographic and geochemical observations. Boumalne volcanic rocks contain high Al2O3, Fe2O3, Ba, Sr, Zr, Rb, and Nb contents, including calc-alkaline affinity in composition. Boumalne volcanic rocks are similar to other lower-Neoproterozoic volcanic rocks such Agouiniy formation in Sirwa inlier and in other parts of Bou-Azzer inlier. Indeed, they indicate an active subduction signature. The geochemical data show a LREE enrichment compared to HREE. The fractional crystallization has played a major role during the evolution of the magma. The less-siliceous dacitic rocks could have been formed after a low degree of partial melting of mafic parental magma source, whereas the rich-siliceous rhyolite may have been derived from dacitic magma source by a higher degree of fractional crystallization. |
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