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handle: 10261/85748
[ES]Se estudia la composición mineralógica de la fracción arcilla de siete perfiles de la Cordillera Central clasificados como tierras pardas de césped y glei. Los minerales de la arcilla presentes en general son caolinita, ilita, intergrados vermiculita-clorita, interestratificados intergrados-ilita y óxidos cristalizados de hierro y aluminio. El grado de transformación mica-intergrados es más acusado en los suelos sobre granitos que en los suelos sobre esquistos y también es mayor en general en los horizontes superficiales de los perfiles. Aparece gibsita en todos los perfiles, en algunos goetita y en los horizones glei es frecuente la presencia de lepidocrocita.
[EN]Clay mineralogy of seven profiles of the Cordillera Central has been studied. The clay minerals commonly encountered are, kaolinite, ilite, vermiculite-chlorite intergrade, ilite integrade interstrafied and crystallized iron and aluminium oxides. The degree of mica-intergrade transformation is higher in the surface horizons and stronger in soils developed from granites as compared to those from schists. Gibbsite occurs in all the profiles. In certain profiles, the presence of goethite and the additional presence of lepidocrocite in gley horizons, was detected.
10 páginas, 2 tablas, 2 figuras. -- Con la colaboración técnica de: P. Rodríguez Palacios y V. Nieves Paz.
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