Caracterización mineralógica de bentonitas del Source Clay Repository
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2021
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Sociedad Geológica de España.
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Abstract
Se caracterizan mineralógicamente 4 muestras bentoníticas del Source Clay Repository con el fin de conocer su composición mineralógica y relacionarla con su respuesta espectral en el rango 400- 2400 nm. Para ello se han utilizado dos técnicas analíticas distintas: difracción de Rayos-X (DRX) y espectroscopía VNIR-SWIR. Ambas técnicas nos muestran un alto contenido en esmectitas, con una cantidad muy pequeña de impurezas de cuarzo en las muestras APA y COU(V). También nos han permitido identificar el carácter di o trioctaédrico de las esmectitas, siendo dioctaédricas las muestras APA y SAN y triocatédricas COU(V) y SHE. La espectroscopía VNIR-SWIR muestra la gran similaritud de las dos muestras dioctaédricas mientras que evidencia el diferente contenido octaédrico de las otras dos muestras estudiadas: COU(V) marcada por su alto contenido en Fe y Mg, y SHE (hectorita sintética) en la que la presencia de Li produce rasgos claramente diferenciadores. Estos resultados indican que la espectroscopía VNIR-SWIR es una técnica útil en la identificación de esmectitas.
Four bentonite samples from Source Clay Repository have been characterized to know their mineralogical composition and to be able to compare them. For that purpose, two different analytical techniques have been used: X-ray diffraction (DRX) and VNIR-SWIR spectroscopy. Both techniques indicate that all samples are very pure, and that APA and COU(V) samples have a very small amount of quartz impurities. They have also allowed us to discriminate between dioctahedrical samples (APA and SAN) and trioctahedrical samples (COU(V) and SHE. VNIR-SWIR spectroscopy shows the high resemblance between the two dioctahedral samples and evidences the clear difference between the two trioctahedral smectites: COU(V) and SHE. COU(V) becasue of its high content in Fe and Mg, and SHE (synthetic hectorite) due to the presence of Li that produces features clearly distinctive. This results indicate that the VNIR-SWIR spectroscopy is a usefull technique to identify smectites.
Four bentonite samples from Source Clay Repository have been characterized to know their mineralogical composition and to be able to compare them. For that purpose, two different analytical techniques have been used: X-ray diffraction (DRX) and VNIR-SWIR spectroscopy. Both techniques indicate that all samples are very pure, and that APA and COU(V) samples have a very small amount of quartz impurities. They have also allowed us to discriminate between dioctahedrical samples (APA and SAN) and trioctahedrical samples (COU(V) and SHE. VNIR-SWIR spectroscopy shows the high resemblance between the two dioctahedral samples and evidences the clear difference between the two trioctahedral smectites: COU(V) and SHE. COU(V) becasue of its high content in Fe and Mg, and SHE (synthetic hectorite) due to the presence of Li that produces features clearly distinctive. This results indicate that the VNIR-SWIR spectroscopy is a usefull technique to identify smectites.