Cuantificación de granos mediante análisis de imagen: aplicación a una muestra de inyección de arena en la base del manto del Esla (Zona Cantábrica, orógeno Varisco)
- Edgar Berrezueta 1
- Manuel de Paz-Álvarez 2
- Sergio Llana-Fúnez 2
- Cynthia Gallego-Ruiz 2
- Berta Ordóñez-Casado 1
- Juan Luis Alonso 2
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1
Instituto Geológico y Minero de España
info
- 2 Departamento de Geología, Universidad de Oviedo
ISSN: 0213-683X
Ano de publicación: 2021
Número: 69
Páxinas: 19-22
Tipo: Artigo
Outras publicacións en: Geogaceta
Resumo
Image analysis of rock samples in thin sections or polished sur- faces allows the characterisation of the sizes and shapes of the par- ticles that conform the rock. In order to test the effectiveness of di- fferent parameters in discriminating particles and grains of different origin and evolution within a rock, we use one sample from a quartz grain-rich injection at the base of the Esla Nappe (Cantabrian Zone, Variscan Orogen). We characterise particles using the parameters area (A), perimeter (P), sphericity (Es), solidity (So), normalised pe- rimeter-area (PAn) and fractal dimension (DF). The analysis allows to discern rounded sand grains of detrital sedimentary origin from grains that have been partially or totally fractured. However, the parameters used could not discriminate sufficiently grains partially corroded by fluids during their injection perhaps due to the effect of subsequent overgrowths by cements.