Résumé
L’utilisation du logiciel de traitement d’image OPTILAB a permis de faire une analyse morphologique quantitative de cristaux de plagioclase (feldspath calcique) dans des roches volcaniques de la Guadeloupe. Pour obtenir ce résultat, à partir de documents photographiques, nous avons mis au point un protocole spécifique facilitant l’acquisition des images. Le traitement de l’image a été ensuite optimisé afin de parvenir à une détermination des seuls cristaux de plagioclase, l’acquisition des résultats et le calcul des divers paramètres recherchés ont été automatisés par utilisation d’un programme en macrocommandes. Les résultats obtenus ont été utilisés pour établir des courbes de distribution de fréquence de longueur (SCD-Crystal Size Distribution) permettant d’obtenir une signature quantitative de la formation et son exploitation à des fins stratigraphiques ou pétrologiques.
Abstract
The use of the picture processing software OPTILAB enabled to achieve a quantitative morphological analysis of plagioclase crystals. In volcanic rocks (Guadeloupe island). To get such a result from pictures, the authors developed a specific procedure in order to make the input of pictures easier. The image processing was then optimized in order to succeed in determining the plagioclase crystals only, and the acquisition of results as well as the computation of the different parameters were automated with the help of a software using macro-instructions. The results achieved were used to settle the crystal size distribution, which enabled to get a quantitative “signature” of the geological formation as well as its development for stratigraphic or petrological purposes.
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Lacube, J., Bissainte, M. & Hernadez, J. Traitement d’image appliqué aux matériaux: Exemple d’une analyse quantitative des feldspaths dans les roches. Bulletin of the International Association of Engineering Geology 47, 109–117 (1993). https://doi.org/10.1007/BF02639598
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DOI: https://doi.org/10.1007/BF02639598