Particle quantification from image analysis: application to a quartz-rich sand injection sample at the basal shear zone of the Esla Nappe (Cantabrian Zone, Variscan orogen)
DOI:
https://doi.org/10.55407/geogaceta102345Keywords:
image optical analysis, fault rock, shape parametersAbstract
Image analysis of rock samples in thin sections or polished surfaces allows for the characterization of sizes and shapes of the particles that make up a rock. To assess the efficacy of various parameters in distinguishing grains and particles of different origins and evolutions within the same rock, we utilized a sample from a quartz grain-rich injection at the base of the Esla Nappe (Cantabrian Zone, Variscan Orogen). We characterized the particles using parameters such as area (A), perimeter (P), sphericity (Es), solidity (So), normalized perimeter-area (PAn), and fractal dimension (DF). This analysis enables differentiation between rounded sand grains of detrital sedimentary origin and grains that have undergone partial or complete fracturing. However, the analysis could not adequately distinguish grains that were partially exposed to the corrosive action of fluids during injection, perhaps due to potential post-injection cementation.
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