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Title: Geochemistry and mineralogy of the clay-type Ni-laterite de-posit of San Felipe (Camagüey, Cuba)
Author: Tauler i Ferré, Esperança
Galí Medina, Salvador, 1949-
Villanova de Benavent, Cristina
Chang-Rodríguez, Alfonso
Núñez-Cambra, Kenya
Khazaradze, Giorgi
Proenza Fernández, Joaquín Antonio
Keywords: Geoquímica
Jaciments minerals
Mineral deposits
Issue Date: 2023
Publisher: MDPI
Abstract: The Ni-laterite deposit at the San Felipe plateau, located 30 km northwest of Camagüey, in central Cuba, is the best example of a clay-type deposit in the Caribbean region. San Felipe resulted from the weathering of mantle peridotites of the Cretaceous Camagüey ophiolites. In this study, a geochemical and mineralogical characterization of two profiles (83 and 84) from the San Felipe deposit has been performed by XRF, ICP-MS, quantitative XRPD, oriented aggregate mount XRD, SEM, FE-SEM, and EMPA. Core 83, with a length of 23 m and drilled in the central part of the plateau, presents a notable concentration of cryptocrystalline quartz fragments and a rather poor content of NiO, averaging 0.87 wt.%. Core 84, which is 12 m long and drilled at the border of the plateau, lacks silica fragments and presents a higher NiO content, averaging 1.79 wt.%. The smectite structural formulae reveal that they evolve from trioctahedral to dioctahedral towards the top of the laterite profiles. Quantitative XRD analyses indicate that smectite is a dominant Ni-bearing phase, accompanied by serpentine and minor chlorite. Serpentine, as smectite, is enriched in the less soluble elements Fe3+, Al, and Ni towards the top of the profiles. Core 83 seems to have been affected by collapses and replenishments, whereas core 84 may have remained undisturbed.
Note: Reproducció del document publicat a:
It is part of: Minerals, 2023, vol. 13, num.10
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ISSN: 2075-163X
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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