Please use this identifier to cite or link to this item: http://hdl.handle.net/10646/1358
Title: Semi-quantitative mineralogical valuation of the non-nickeliferous weathering crusts in the northeast of Cuba
Authors: Njila, Tendai
Martínez, Roberto Díaz
Fernández, Joaquín Proenza
Melgar, Gerardo Orozco
metadata.dc.type: Article
Keywords: clays
mineralogical index of alteration
mineralogy
northeast Cuba
weathering crusts
Issue Date: Dec-2010
Publisher: High Institute of Mining and Metallurgy (ISMM)
Citation: Njila, T., Martinez, R. D., Fernández, J. P., & Melgar, G. O. (2010). Semi-quantitative mineralogical valuation of the non-nickeliferous weathering crusts in the northeast of Cuba. Minería y Geología, 26 (4), 1-15.
Abstract: This study presents a semi-quantitative mineralogical evaluation of the non-nickeliferous weathering crusts in the areas of Baconal, El Culebro, Caimanes and Farallones in the northeast of Cuba. The main objective of this study is to determine the main mineral phases, their vertical distribution and concentration, as well as the degree of mineral transformation in the weathering profiles. Sixteen samples were analyzed by X-Ray Diffraction and the diffractograms were used in qualitative and semi-quantitative phase analyses using ANALYZE and AUTOQUAN programs. The degree of mineral transformation in relation to phase distribution and concentration as weathering progressed was evaluated using the Mineralogical Index of Alteration. The main mineral phases present in Baconal and El Culebro are Kaolinite (50-75%), Kaolinite-Montmorillonite (50-75%), Quartz (25-50%), Plagioclase, mainly Albite (25-50%) and Hematite (<10%). In Caimanes and Farallones the principal mineral phases present are Kaolinite, Hematite, Quartz, Potassic feldspars, mainly as Orthoclase, all with more than 75%, Halloysite (<10%), and Montmorillonite (<10%). Extreme primary mineral transformation is evidenced in the intermediate and upper layers in Baconal, El Culebro and Caimanes (Mineralogical Index of alteration values between 29 and 98 %). This transformation is also evidenced in the whole Farallones profile (98-99 %). In conclusion, the non-nickeliferous weathering crusts in Baconal, El Culebro, Caimanes and Farallones are mainly kaolinitic clays.
URI: http://hdl.handle.net/10646/1358
ISSN: 1993 8012
Appears in Collections:Geology Staff Publications

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