Carregant...
Fitxers
Tipus de document
ArticleVersió
Versió acceptadaData de publicació
Tots els drets reservats
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/160420
Discovery of Ni-smectite rich saprolite at Loma Ortega, Falcondo mining district (Dominican Republic): geochemistry and mineralogy of an unusual case of 'hybrid hydrous Mg silicate-clay silicate' type Ni-laterite
Títol de la revista
Director/Tutor
ISSN de la revista
Títol del volum
Recurs relacionat
Resum
Hydrous Mg silicate-type Ni-laterite deposits, like those in the Falcondo district, Dominican Republic, are dominated by Ni-enriched serpentine and garnierite. Recently, abundant Ni-smectite in the saprolite zone have been discovered in Loma Ortega, one of the nine Ni-laterite deposits in Falcondo. A first detailed study on these Ni-smectites has been performed (μXRD, SEM, EPMA), in addition to a geochemical and mineralogical characterisation of the Loma Ortega profile (XRF, ICP-MS, XRD). Unlike other smectite occurrences in laterite profiles worldwide, the Loma Ortega smectites are trioctahedral and exhibit high Ni contents never reported before. These Ni-smectites may be formed from weathering of pyroxene and olivine, and their composition can be explained by the mineralogy and the composition of the Al-depleted, olivine-rich parent ultramafic rock. Our study shows that Ni-laterites are mineralogically complex, and that a hydrous Mg silicate ore and a clay silicate ore can be confined to the same horizon in the weathering profile, which has significant implications from a recovery perspective. In accordance, the classification of "hybrid hydrous Mg silicate - clay silicate" type Ni-laterite deposit for Loma Ortega would be more appropriate.
Matèries
Matèries (anglès)
Citació
Citació
TAULER I FERRÉ, Esperança, LEWIS, J. f., VILLANOVA DE BENAVENT, Cristina, AIGLSPERGER, Thomas hans, PROENZA FERNÁNDEZ, Joaquín antonio, DOMÈNECH ORTÍ, Cristina, GALLARDO, T., LONGO, Francisco, GALÍ MEDINA, Salvador. Discovery of Ni-smectite rich saprolite at Loma Ortega, Falcondo mining district (Dominican Republic): geochemistry and mineralogy of an unusual case of 'hybrid hydrous Mg silicate-clay silicate' type Ni-laterite. _Mineralium Deposita_. 2017. Vol. 52, núm. 1011-1030. [consulta: 21 de gener de 2026]. ISSN: 0026-4598. [Disponible a: https://hdl.handle.net/2445/160420]