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Bentonites from Benavila (Portugal). Mineralogicdl tlidraclerisdliun and properties

dc.contributor.authorDias, María Isabel
dc.contributor.authorSuárez Barrios, M.
dc.contributor.authorPrates, S.
dc.date.accessioned2014-10-28T13:46:48Z
dc.date.available2014-10-28T13:46:48Z
dc.date.issued2003
dc.identifier.urihttp://hdl.handle.net/10272/9003
dc.description.abstractThe igneous massif of Benavila (Portugal) is constituted by rocks of granitoid nature, especially granodiorites associated to quartzdiorites, partially covered with palaeogenic sediments. A chemical, mineralógicaI and textural characterisation of clay materials deriving from weathering of those rocks has been done. Clays resulting of the weathered granodiorites of Benavila, are very rich in smectites. The X-ray diffraction (XRD) results of the bulk sample enhance the clayey characteristics of those materials, mainly associated to calcite, and traces of quartz and feldspars. A monomineralic clay sample has been chosen for a more detailed study. The clay fraction XRD results enhance the presence of only smectite, that is well crystallized and dioctahedral. A structural formula for this smectite of Benavila is proposed. The chemical analysis points to a Tatatila smectite type, relatively enriched in iron. The exchange cation capacity has been calculated in the bulk sample and in the < 2 pm fraction. The Specific Surface area has been evaluated in the 77°K nitrogen adsorption-desorption isotherms, applying the BET method. A porosity study has also been made through the t-curves. The results obtained with all those analyses are lower than the usually presented in literatureen_US
dc.language.isospaen_US
dc.publisherSociedad Geológica de Españaen_US
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/*
dc.subject.otherGeochemistryen_US
dc.subject.otherMineralogyen_US
dc.subject.otherSmectite,en_US
dc.subject.otherBeidelliteen_US
dc.subject.otherPortugalen_US
dc.subject.otherStructural formulaen_US
dc.subject.otherXRDen_US
dc.subject.otherIR-spectroscopyen_US
dc.subject.otherSpecific surface areaen_US
dc.titleLas bentonitas de Benavila (Portugal). Caracterización mineralógica y propiedadesen_US
dc.titleBentonites from Benavila (Portugal). Mineralogicdl tlidraclerisdliun and propertieseng
dc.typeinfo:eu-repo/semantics/articleen_US
dc.rights.accessRightsinfo:eu-repo/semantics/openAccessen_US


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