Composición mineralógica de unidades sedimentarias cenozoicas mediante espectroscopía de reflectancia de laboratorio (VNIR–SWIR) en el sector noroccidental de la Cuenca del Duero (León, España)
- A. Báscones 1
- E. García-Meléndez 1
- M. Suárez 2
- M. Ferrer-Julià 1
- E. Colmenero-Hidalgo 1
- A. Quirós 3
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1
Universidad de León
info
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2
Universidad de Salamanca
info
- 3 Universidad en León
ISSN: 1576-5172
Any de publicació: 2021
Títol de l'exemplar: X Congreso Geológico de España
Número: 18
Pàgines: 352-355
Tipus: Article
Altres publicacions en: Geotemas (Madrid)
Resum
Laboratory reflectance spectroscopy techniques were used to measure the mineralogical composition of the sam- ples collected on the surface of Neogene and Quaternary sediments from the Northwestern sector of the Duero Basin. The vibrations of the bonds that form the crystalline structure of some minerals produce absorption features in specific positions on the electromagnetic radiation spectrum in the SWIR (1200–2500 nm). By applying the method of the second derivative, we established correlations between the mineralogical results obtained by XRD and the characteristics of the absorption features produced by the minerals that are part of the studied sediments. Among the clay minerals that are present in the analyzed sediments, kaolinite shows the best correlation to the spectral data. Through the measurement of geometrical parameters based on spectral features such as the band center and the intensity of the absorption band, we established a distinction of the main types of Fe-oxides (hematite/goethite) that are developed on the analyzed soils. These absorption features are produced in specific zones of the VNIR (400–1200 nm) by electronic transitions and charge transfer processes of Fe.