Hamidi, E.M. and Colin, F. and Boulange, B. (1998) Evidence of early carbonate crust formation on Triassic basalt in the Middle Atlas (Morocco) Mise en évidence d'un début d'encroûtement carbonaté sur les basaltes du Trias dans le Moyen Atlas (Maroc). Bulletin de la Societe Geologique de France, 169 (1). pp. 63-68.

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Abstract

The first stages of the basalt calcitization were studied along a weathering profile located near Elhajeb city, within the Moroccan Middle Atlas. This study allowed us to distinguish between smectitic weathering of basalt and its calcitization. The weathering front is up to 35 m deep. It is characterized by the transformation of primary minerals to smectites with a strong depletion of Ca. Calcitization is developed until 1.5 m deep and the lower limit of the calcitization front is marked by an increase of the Ca contents. 10 to 15 of this calcium is inherited from basaltic material and is in situ incorporated in secondary products. The 85 to 90 remained are of external origin to the profile and attributed to either Quaternary carbonate (travertine) surrounding the profile or to Liassic carbonates outcropping above Elhajeb basin.

Item Type: Article
Uncontrolled Keywords: basalt; carbonate crust; Triassic; weathering, Morocco
Subjects: Earth and Planetary Sciences
Divisions: SCIENTIFIC PRODUCTION > Earth and Planetary Sciences
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:47
URI: http://eprints.umi.ac.ma/id/eprint/2989

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