Dekayir, A. and El Maâtaoui, M. (2000) Contribution of image analysis to the study of weathering process in alkaline basalt (Middle Atlas, Morocco) Apport de l’analyse d’images dans l’etude de l’altération d’un basalte alcalin (Moyen Atlas, Maroc). Engineering Geology, 56 (3-4). pp. 325-334.

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Abstract

Quaternary alkaline basalts of Middle Atlas, are weathered into spheroidal volumes organized into weathering cover. In the profile studied, the study of transformations from a fresh core basalt to the most weathered rinds, has been analysed using BESI images (backscattred electron image analysis). A part from the microscopic analysis of each weatherted basalt, proportions of primary minerals, clays and pore space has been quantified in different stages of weathering. Indeed, in fresh core basalt, weathering is characterized by a first dissolution of the glass, followed by feldspar transformations in twinning plans, cleavages and in micropores inherited from the magmatic and cristallographic history of the rock. In most basaltic weathered rinds, pore spaces given by the dissolution of the glass, were filled by a mixture of clays and iron products. In these samples, feldspars are completely dissolved giving important porosity occupied by small quantity of halloysite and kaolinite. The olivine and pyroxene transformations are accompanied by weak pore space formation. At the bottom of the soil, this porosity decreases in response to filling by later secondary products which come from the upper part of the soil by weathering solutions. © 2000 Elsevier Science B.V.

Item Type: Article
Uncontrolled Keywords: Clay; Dissolution; Electron scattering; Glass; Image analysis; Microscopic examination; Minerals; Petrology; Porosity; Soils; Weathering, Feldspars; Fresh core basalt; Halloysite; Kaolinite; Microscopic analysis; Pore space; Pyroxene; Quarternary alkaline basalt, Basalt, alkali basalt; electron microscopy; image analysis; 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/2983

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