A COMPARATIVE STUDY OF MINERALOGICAL TRANSFORMATIONS IN FIRED CLAYS FROM THE LABOYOS VALLEY, UPPER MAGDALENA BASIN (COLOMBIA)
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Universidad Industrial de Santander
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Las transformaciones mineralógicas durante el quemado de las arcillas del Valle de Laboyos en la Cuenca del Alto Magdalena (Colombia) fueron estudiadas. La cocción de las arcillas se llevó a cabo en el rango de temperatura 800-1200 ºC bajo condiciones oxidantes. Las transformaciones mineralógicas fueron investigadaspor difracción de rayos X (DRX) y microscopía electrónica de barrido (MEB). Importantes diferencias composicionales en las fases neoformadas se observaron en las arcillas. Paragénesis típicas con cuarzo, illita,caolinita, mica, feldespato potásico halloysita y plagioclasa fueron observadas. Varias fases minerales fueron identificadas en las arcillas quemadas, con productos de reacción incluyendo mullita, cuarzo residual, hematita,fase amorfa (vidrio generado por la fusion de feldespatos y arcillas) en las arcillas cocidas.
Palabras clave: Transformaciones mineralógicas, Arcillas, Valle de Laboyos, Fases neoformadas, Paragénesis.
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.
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.