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- W2033542606 abstract "ABSTRACT Mineralogical transformations during firing of clays from the Laboyos Valley at the Upper Magdalena Basin(Colombia) were studied. Firing of clays was carried out in the temperature range 800–1200 °C under oxidizing conditions. The mineralogical transformations were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Important compositional differences in the neoformed phases were observed inthe clays. Typical assemblages with quartz, illite, kaolinite, mica, halloysite, potassium feldspar and plagioclase were observed. Several mineral phases were identified in the fired clays, with the reaction products including mullite, residual quartz, hematite, amorphous phase (glass generated by melting of feldspars and clays) in thefired clays. Keywords : Mineralogical transformations, Clays, Laboyos Valley, Neoformed phases, Assemblages. ESTUDIO COMPARATIVO DE LA TRANSFORMACION MINERALOGICADE ARCILLAS COCIDAS DEL VALLE DE LABOYOS, CUENCA ALTA DELMAGDALENA (COLOMBIA) RESUMEN Las transformaciones mineralogicas durante el quemado de las arcillas del Valle de Laboyos en la Cuenca del Alto Magdalena (Colombia) fueron estudiadas. La coccion de las arcillas se llevo a cabo en el rango de temperatura 800-1200 oC bajo condiciones oxidantes. Las transformaciones mineralogicas fueron investigadaspor difraccion de rayos X (DRX) y microscopia electronica de barrido (MEB). Importantes diferencias composicionales en las fases neoformadas se observaron en las arcillas. Paragenesis tipicas con cuarzo, illita,caolinita, mica, feldespato potasico halloysita y plagioclasa fueron observadas. Varias fases minerales fueron identificadas en las arcillas quemadas, con productos de reaccion incluyendo mullita, cuarzo residual, hematita,fase amorfa (vidrio generado por la fusion de feldespatos y arcillas) en las arcillas cocidas. Palabras clave: Transformaciones mineralogicas, Arcillas, Valle de Laboyos, Fases neoformadas, Paragenesis." @default.
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- W2033542606 date "2012-08-24" @default.
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- W2033542606 title "A COMPARATIVE STUDY OF MINERALOGICAL TRANSFORMATIONS IN FIRED CLAYS FROM THE LABOYOS VALLEY, UPPER MAGDALENA BASIN (COLOMBIA)" @default.
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