Abstract
The paper reports a study of the behaviour of free mica grains in crushed rock aggregates of metamorphic origin undertaken to identify any typical trends of enrichment with grain size. The mineralogical composition of the various grain size fractions was obtained using a polarizing microscope and point counting. Two general trends of enrichment of mica are presented: Type I (isotropic source rock) and Type A (anisotropic source rock). Type I is associated with a general increase in free mica towards the finer fraction, with or without a peak for “coarser” grain fractions. Type A is associated with an increase in free mica up to a certain grain fraction, after which there is a decrease with progressively smaller grain size.
Résumé
L’article présente une étude sur l’importance des grains de micas libres dans des granulats de roches métamorphiques concassées, en fonction de la taille des grains. La composition minéralogique des diverses fractions granulométriques a été déterminée au microscope polarisant, utilisant le compteur de points. Deux tendances générales relatives à l’enrichissement en grains de micas libres sont apparues: Le type I (roches initiale isotrope) et le type A (roches initiale anisotrope). Le type I présente une augmentation générale des micas libres dans les fractions les plus fines, avec ou sans pic pour les fractions les plus grossières. Le type A présente, pour des tailles de grains décroissantes, une augmentation des micas libres jusqu’à une certaine taille de grains, après quoi apparaît une diminution de micas libres pour les plus petites tailles de grains.
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Acknowledgments
The Swedish Road Administration and the Swedish National Road and Transport Research Institute funded this work. The authors express their gratitude to Safwat Said for valuable comments and Håkan Arvidsson for technical assistance.
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Loorents, KJ., Kondelchuk, D. Trends of enrichment of free mica grains in crushed rock aggregates. Bull Eng Geol Environ 68, 89–96 (2009). https://doi.org/10.1007/s10064-008-0181-y
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DOI: https://doi.org/10.1007/s10064-008-0181-y