Physico-chemistry and geochemistry of Balengou clay deposit (West Cameroon) with inference to an argillic hydrothermal alteration - 01/12/17
pages | 11 |
Iconographies | 9 |
Vidéos | 0 |
Autres | 0 |
Abstract |
Field description and sampling along two pits, granulometry, Atterberg limits, mineralogical (XRD, FTIR, DSC & TGA) and geochemical analyses of the Balengou clays help to determine their characteristics and the genesis of the deposit. The mineralogical composition is comprised of halloysite–kaolinite, quartz, montmorillonite, hematite, anatase, feldspar, zircon, chromite, and apatite. Gibbsite and illite occur at the shallow and deep depth, respectively. Dikes of sand-poor clays contain also cristobalite and tridymite. Pairs of elements Rb–Ba, Rb–Sr, Nb–Ta, Ta–Zr, TiO2–Zr display good positive correlations (R2>0.85). REE patterns are highly fractionated (LaN up to 3312, LaN/YbN: 19–10) and are marked by deep Ce and Eu negative anomalies. Immobile element canonical ratios indicate that the protoliths were commendite/pantelerite, rhyolite and dacite, or their plutonic equivalents. Mineralogical and geochemical features lead to the suggestion that the clays derived from an advanced argillic hydrothermal alteration.
Le texte complet de cet article est disponible en PDF.Keywords : Balengou-Cameroon, Halloysite, Mineralogy, Geochemistry, Advanced argillic hydrothermal alteration
Plan
Vol 349 - N° 5
P. 212-222 - septembre 2017 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
L’accès au texte intégral de cet article nécessite un abonnement.
Bienvenue sur EM-consulte, la référence des professionnels de santé.
L’achat d’article à l’unité est indisponible à l’heure actuelle.
Déjà abonné à cette revue ?