Assessments on the progress of weathering in the gabbro regolith of the "Cayo Guam" sector in Moa (Holguin province)
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Abstract
Results of chemical and mineral composition in the gabbro regolite sampled in an area of the "Cayo Guam" sector of the Moa region are presented, with the objective of determining the intensity, classification of the weathering process and determination of the thickness of useful clay mineral in the regolite, respectively. As research methods, the following indexes were used: chemical alteration index (CIA) and mafic-ultramafic index (UMIA), which allowed classifying this weathering event as of extreme intensity (grade VI; UMIA = 41.09 - 94.07%; CIA = 56.43 - 96.56%). The mineral composition of the regolith was also determined using three variants of Thermogravimetric Analysis, showing the presence of mixtures of kaolinitic clays of disordered structure and halloysite, minerals that can be seen from the deepest levels of the regolith, classifying it as simple sialitic (kaolinitic), a process that culminated with lateritization-alitization and simultaneous formation of alkali blocks of gibbsite composition that are finally observed in the superficial zone of the profile (IOL: 79. 21 - 79.78%). The results obtained are considered similar to those obtained by other researchers in the region itself, and therefore indicate that the regolith of the investigated sector, given the useful thickness of the kaolinitic layer (0.5 - 16.30 m), presents good potential for its use as a source of supplementary cementitious materials and in the manufacture of refractory elements for red ceramics.
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References
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