Mapping hydrothermal alterations and lineaments associated with epithermal and massive sulphides deposits of Tifraouine (northwest Algerian coast): Use of Landsat 8 OLI data and remote sensing

Bouchera Labdaoui; Hanafi Benali; Amina Boughacha; Khadidja Moussaoui

doi:10.55407/rsge.96703

Autores/as

Bouchera Labdaoui Houari Boumediene University of Sciences and Technology
Hanafi Benali Houari Boumediene University of Sciences and Technology
Amina Boughacha Houari Boumediene University of Sciences and Technology
Khadidja Moussaoui Houari Boumediene University of Sciences and Technology

DOI:

https://doi.org/10.55407/rsge.96703

Palabras clave:

vulcanismo, alteración, Tifraouine, fracturas, detección

Resumen

En el contexto del estudio de las mineralizaciones relacionadas con las rocas volcánicas del Mioceno de la parte norte de Argelia, los datos del Landsat 8 OLI y las técnicas de teledetección se han utilizado para caracterizar y cartografiar los afloramientos de alteración hidrotermal en las rocas volcánicas del Mioceno de Tifraouine, en la costa noroeste de Argelia, donde se conocen varios indicios de mineralización. Las bandas del infrarrojo de onda corta (SWIR) permitieron identificar las alteraciones de la arcilla, mientras que las bandas del visible e infrarrojo cercano ayudaron a detectar las alteraciones del hierro. Se obtuvieron imágenes de combinación de colores rojo-verde-azul de proporciones 6/7, 4/2 y 5/6. Se realizó un análisis de componentes principales (PCA) para caracterizar las zonas alteradas y extraer los lineamientos. La técnica de filtrado emparejado (MF) permite la detección directa después de aplicar la transformación de fracción de ruido mínima (MNF) y el índice de pureza de píxeles a los espectros, para obtener un mapa de distribución de las especies minerales objetivo en el área estudiada. Los resultados obtenidos por teledetección muestran que las alteraciones hidrotermales están claramente controladas por rasgos tectónicos. Están muy concentradas en la zona de las calderas y se extienden hacia la zona de Bouzedjar, lo que permitió comprobar el mapa realizado según los estudios de campo. Esto contribuirá a los estudios preliminares relacionados con la exploración minera y mejorará el potencial minero de Tifraouine. La adquisición de datos complementarios permitirá ampliar este estudio en los próximos trabajos.

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