Mapeo de redes de fracturas mediante imágenes Landsat-8 OLI en la zona minera de Jbel Tijekht en el Anti-Atlas oriental de Marruecos

Autores/as

  • Omar Saidi Research team of Geophysics, Georesources and Heritage, Department of Geosciences, Faculty of Sciences and Techniques, Moulay Ismaïl University https://orcid.org/0000-0002-5878-2864
  • Hicham Si Mhamdi Research team of Applied Geodynamics and Remote Sensing to Naturel Ressources, Department of Geosciences, Faculty of Sciences and Techniques, Moulay Ismaïl University https://orcid.org/0000-0002-9008-2059
  • Abdelhafid Essalhi Research team of Geophysics, Georesources and Heritage, Department of Geosciences, Faculty of Sciences and Techniques, Moulay Ismaïl University https://orcid.org/0000-0002-5777-1100
  • Abdeslam Toummite Research team of Geophysics, Georesources and Heritage, Department of Geosciences, Faculty of Sciences and Techniques, Moulay Ismaïl University https://orcid.org/0000-0002-1955-3276

DOI:

https://doi.org/10.3989/egeol.43887.587

Palabras clave:

Cartografía estructural, Extracciones de lineamientos, Variscan, Jbel Tijekht, Dorsal Ougnat-Ouzina, Anti-Atlas oriental marroquí

Resumen


El Jbel Tijekht es una de las estructuras geológicas más importantes de la cordillera de Ougnat-Ouzina en el Anti-Atlas Oriental. Este macizo en forma de media luna fue afectado por una red de fracturas que es visible a diferentes escalas. Es particularmente rico en vetas mineralizadas de barita y está asociado con otros minerales (por ejemplo, pirita, calcopirita, esfalerita y galena). Para estudiar los sistemas de fracturas en la zona minera de Jbel Tijekht, optamos por una combinación de teledetección e investigación de campo que se convirtió en una importante herramienta para la cartografía de las fracturas y la exploración de minerales. Este trabajo presenta un enfoque metodológico para detectar los lineamientos estructurales. Para ello, se aplicaron diversas técnicas a la imagen del Landsat 8 para mejorar la visibilidad de las estructuras lineales. Tras correcciones radiométricas y atmosféricas, los colores compuestos y los filtros direccionales aplicados al componente principal (PC1) se pudo establecer un mapa de lineamientos para Jbel Tijekht. La validación y corrección de estos lineamientos se basan en documentos preexistentes combinados con observaciones de campo. El análisis estadístico del mapa de lineamientos permite la identificación de al menos tres sistemas de fractura direccional con orientaciones promedio NS, NE-SW y ENE-WSW. Los sistemas NS y NE-SW muestran una alta densidad en la mayor parte del área de estudio. Estos resultados claramente se superponen a diferentes estructuras tectónicas y a las vetas existentes. Esto permitió establecer un vínculo geológico entre la litología, los sistemas de fracturas y la mineralización. La densidad de fracturas puede atribuirse a las últimas fases de fragilidad del orógeno varisco, lo que refleja la reología de las unidades de roca; la alta densidad de fractura se observa en las rocas competentes como las areniscas de Tabanit. Estas zonas constituyen un área favorable para los depósitos de mineralización.

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Publicado

2020-10-19

Cómo citar

Saidi, O., Mhamdi, H. S., Essalhi, A., & Toummite, A. (2020). Mapeo de redes de fracturas mediante imágenes Landsat-8 OLI en la zona minera de Jbel Tijekht en el Anti-Atlas oriental de Marruecos. Estudios Geológicos, 76(2), e133. https://doi.org/10.3989/egeol.43887.587

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