Bensalah, M.K. and Youbi, N. and Mahmoudi, A. and Bertrand, H. and Mata, J. and El Hachimi, H.E. and Madeira, J. and Martins, L. and Marzoli, A. and Bellon, H. and Medina, F. and Karroum, M. and Karroum, L.A. and Abbou, M.B. (2011) The Central Atlantic Magmatic Province (CAMP) volcanic sequences of Berrechid and Doukkala basins (Western Meseta, Morocco): Volcanology and geochemistry As sequências vulcânicas da província magmática do Atlântico Central (CAMP) das bacias de berrechid e Doukkala (Meseta Ocidental de Marrocos): Vulcanologia e geoquímica. Comunicacoes Geologicas, 98 (1). pp. 15-27.

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Abstract

The Late Triassic-Early Jurassic volcanic succession of the Berrechid and Doukkala basins (Western Meseta, Morocco) comprises two lava flow fields. At the base, the Sidi Mohamed Larbi-Sidi Saïd Mâachou Formation is composed of 1 to 5 flows, while the upper Aïn Bouhachad Formation presents 1 or 2 flows. Lavas are mainly compound pahoehoe flows showing evidence of endogenous growth by inflation, suggesting slow emplacement during sustained eruptive episodes. Textures vary vertically in each lobe (fine to medium-grained intergranular, subophitic to ophitic in the lava core, and aphanitic to glomeroporphyritic in the lava crust). The mineralogy is typical of continental tholeiites: plagioclase, clinopyroxene (augite and pigeonite), and minor amounts of olivine and ferro-titanium oxides. The major and trace element concentrations and/or ratios of the two formations match, respectively, the compositions described elsewhere for the Lower and Intermediate formations of the Central Atlantic Magmatic Province (CAMP) from the Central High Atlas and Argana basin. © 2011 LNEG - Laboratório Nacional de Geologia e Energia, IP.

Item Type: Article
Uncontrolled Keywords: concentration (composition); depositional sequence; emplacement; igneous geochemistry; Jurassic; lava flow; magmatism; pahoehoe; trace element; Triassic; volcanic eruption; volcanology; clinopyroxene; plagioclase; tholeiite, Argana Basin; Atlas Mountains; Chaouia-Ouardigha; Guelmim-Es Smara; High Atlas; Meseta; Morocco
Subjects: Earth and Planetary Sciences
Divisions: SCIENTIFIC PRODUCTION > Earth and Planetary Sciences
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:46
URI: http://eprints.umi.ac.ma/id/eprint/2923

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