About
117
Publications
26,501
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
965
Citations
Introduction
Publications
Publications (117)
The Moa Bay lateritic Ni-Co mining district (eastern Cuba) has total mineral resources of 198.54 million metric tonnes (Mt) at 1.07% Ni and 0.12% Co. Laterite profiles from this district are characterized by their oxide-dominated ore zones. Laterite profiles from the Yagrumaje Norte, Punta Gorda, and Yamanigüey deposits contain average Ni and Co co...
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 profi...
Moa Bay is a world-class Ni laterite mining
district with reserve estimates of 53.4 Mt at 1.16 % grade
Ni. The vast majority of the deposits belong to the oxide
type, and are mined for their Ni-bearing Fe-oxyhydroxides
in the oxide zone. One exception is Yamanigüey which can
be classified as a hydrous Mg silicate Ni-laterite deposit.
The study of a...
The Ni-laterite deposit at the San Felipe plateau, located 30 km northwest of Camagüey, in cen-tral Cuba, is the best example of a clay-type deposit in the Caribbean region. San Felipe resulted from weathering of mantle peridotites of the Cretaceous Camagüey ophiolites. In this study, a geochemical and mineralogical characterization of two profiles...
Thermal triaxial tests were carried out on remolded material of core samples of the shear zone of a deep-seated landslide, the El Forn landslide (Andorra). With the thermal triaxial tests, we have obtained thermal and rate sensitivi- ties of the material outside and inside the shear band. Moreover, micro-scale tests were carried out, such as XRPD,...
Cobalt demand is increasing due to its key role in the transition to clean energies. Although the main Co ores are the sediment-hosted stratiform copper deposits of the Democratic Republic of the Congo, Co is also a by-product of Ni–Co laterite deposits, where Co extraction efficiency depends, among other factors, on the correct identification of C...
In the Neolithic Gavà mines, variscite and turquoise were exploited for ornaments manufacturing, although some prospective pits and tunnels were dug on other similar greenish minerals such as smectite or kandite. A 3D study of the distribution of mineral phases allows us to determine the parameters involved in variscite colours. Methods are compris...
Surface sediments of Amanay Seamount, El Banquete and Conception Bank are made up of marine carbonates from heterozoan
organisms of temperate waters. Provenance and grain-size analyses suggest a geospatial segmentation of microfacies.
Maërl beds of Holocene-aged (McMaster and Conover, 1966), gravel-sized macroids (e.g.: rhodolites) with sand-sized...
Amanay Seamount, El Banquete, and Conception Bank are three closest submarine volcanic edifices to both Fuerteventura
and Lanzarote islands (Ancochea and Huertas, 2003). Petrography, mineralogy, and geochemistry studies on 45 volcanic, 15
subvolcanic, 15 volcaniclastic, and 5 volcano-sedimentary rocks have made it possible to extend our geological...
Inadequate waste management in Mining Environmental Liabilities (MEL) represents a risk for the environment and human health and generates social problems. The aim of this article is twofold: i) to evaluate the environmental quality of soils from a geo-ecological perspective; and ii) to inventory native flora around two MEL in the Hualgayoc distric...
Deep-seated landslides are among the most devastating natural hazards on earth, usually involving a rigid rock mass sliding over a weak, clayey shear-band rich in phyllosilicates. The mechanical response of this shear-band to the loading of the overburden is, therefore, critical for the stability and the evolution of a landslide. We hereby show tha...
The Camarasa Dam was built in 1920 using dolomitic aggregate and Portland cement with two different compositions: type A (dolomite and Portland cement) and type B (dolomite and sand-cement). The sand cement was a finely powdered mixture of dolomite particles and clinker of Portland cement. The mineralogy of concrete was studied by optical microscop...
The Eureka deposit in Castell-estaó in the Catalan Pyrenees is a Cu-U-V deposit, hosted by Triassic red-bed sandstones, and classified here as a low-temperature, sandstone-hosted stratabound metamorphite U deposit. The main mineralisation is stratabound, related to coal-bearing units and produced during the Alpine deformation by migration of hydrot...
The essential role of Critical Elements (CE) in 21st century economy has led to an increasing demand of these metals and promotes the exploration of non-conventional deposits such as weathering profiles. The present work is focused on the study of a weathering profile located at the Archaeological Park of the Gavà Neolithic Mines, Barcelona, Catalo...
Deep-seated landslides are among the most devastating natural hazards on earth, typically involving a rigid rock mass sliding over a weak, clayey shear-band rich in phyllosilicates. The mechanical response of this shear-band to the loading of the overburden is therefore critical for the stability and evolution of a landslide. We hereby show that th...
The polymetallic Huanuni deposit, a world-class tin deposit, is part of the Bolivian tin belt. As a likely case for a “mesothermal” or transitional deposit between epithermal and porphyry Sn types (or shallow porphyry Sn), it represents a case that contributes significantly to the systematic study of the distribution of critical elements within the...
The tin-rich polymetallic epithermal deposit of Poopó, of plausible Late Miocene age, is part of the Bolivian Tin Belt. As an epithermal low sulfidation mineralisation, it represents a typological end-member within the "family" of Bolivian tin deposits. The emplacement of the mineralisation was controlled by the regional fault zone that constitutes...
Large kaolin deposits developed by weathering on Precambrian granitic rocks have been discovered in the Caluquembe area, Huíla province, Angola. To determine accuracy of analysis and to evaluate the kaolinite grade, a full-profile Rietveld refinement by X-ray Powder Diffraction (XRPD) and Thermal Gravimetric Analysis (TGA) was used. Caluquembe kaol...
Aeolian influx and related environmental conditions on Gran Canaria during the early Pleistocene – ERRATUM - Volume 91 Issue 1 - Inmaculada Menéndez, José Mangas, Esperança Tauler, Vidal Barrón, José Torrent, Juan F. Betancort, Ángelo Santana, José Manuel Recio, Luis A. Quevedo-González, Ignacio Alonso, Jorge Méndez-Ramos
The island of Gran Canaria is regularly affected by dust falls due to its proximity to the Saharan desert. Climatic oscillations may affect the Saharan dust input to the island. Geochemical, mineralogical, and textural analysis was performed on a well-developed and representative early Pleistocene paleosol to examine Saharan dust contribution to Gr...
The Mineralogy teaching collection from the University of Barcelona has proved to be a successful tool for students. The urge of its renewal to meet the necessities of modern industry brought the idea to replicate this collection in order to offer high quality teaching material to other universities worldwide. This project has led to an internation...
Fe–Ni-bearing serpentine from the saprolite horizon is the main Ni ores in hydrous silicate-type Ni laterites and formed by chemical weathering of partially serpentinized ultramafic rocks under tropical conditions. During lateritization, Mg, Si, and Ni are leached from the surface and transported downwards. Fe2+ is oxidized to Fe3+ and fixed as ins...
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 b...
The pyroclastic carbonatitic rocks from the Catanda volcanic area (Angola) contain
annite and phlogopite grains which have been affected to a significant extent by vermiculitization. A
mineralogical study of these micas has revealed that the annite was altered to K-vermiculite while
vermiculitization of phlogopite generated Ca-vermiculite. Intermed...
Geochemical constraints on rare-earth element distribution of seamount-derived deposits from Amanay, Banquete and Conception Bank (Canary Islands). 2nd European Mineralogical Conference (September 11-15, 2016). Book of Abstracts, pp. 524. Rimini, Italy.
During the oceanographical cruises of the LIFE+ INDEMARES (2009-2013) project, samples of ferro-manganese crusts have been collected from Amanay, El Banquete and Conception Bank seamounts (Canary Islands). Petrography, mineralogy and geochemistry studies have been conducted in order to characterize geologically these deposits. Hereby we expose and...
The types of ore deposits in the Cartagena range are mainly carbonate replacements and veins which are mainly hosted in late Paleozoic to middle Triassic and Miocene rocks. During the Miocene there was a significant magmatic and hydrothermal activity in the area. Mineralogical and geochemical analyses show that there could be three different possib...
A new cartography of the veins and a detailed mineral sequence is provided for the Itos and San José mines, Oruro, Bolivia. The mineral sequence comprises an early stage with arsenopyrite, arsenian pyrite and cassiterite, followed by a stage with tin sulphosalts and Sn-rich sphalerite. In the latest stage, silver and lead sulphosalts formed along w...
The polymetallic mineralization veins of the world class Huanuni district in Bolivia form a conspicuously intricate framework. Comprehensive study on the mineralogy of proximal and distal deposits indicates that In is preferably concentrated in sphalerite precipitated in a lower-temperature stage in the distal domain. Other strategic elements repor...
The main Ni ores in hydrous silicate type Ni-laterites are Fe-Ni-bearing serpentines from the saprolite horizon, which are formed by weathering of partially serpentinised ultramafic rocks under tropical conditions. This serpentine (namely serpentine I) is of hydrothermal origin and yields similar Ni and lower Fe than the primary olivine. It has an...
La col·lecció de Mineralogia és una de les infraestructures més antigues de la Universitat de Barcelona (UB). Un segle i mig més tard d'haver estat eliminats els estudis universitaris a Barcelona pels decrets de Nova Planta, i cercant-ne la restauració, la influent Societat Econòmica Barcelonesa d'Amics del Pais plantejà el 1835 la creació d'una cà...
A leap in seamounts geo-characterization: using a multi-technical approach for origin, nature and evolution of Amanay, Banquete and Conception Bank (Canary Islands). LIFE+ INDEMARES (2009-2013). Book of Abstracts submitted to the IV Congress of Marine Sciences (June 11-13, 2014), pp. 204-205. Las Palmas de Gran Canaria, Spain.
Garnierites (Ni-Mg-bearing phyllosilicates) are significant ore minerals in Ni-laterites of the hydrous silicate-type. In the Falcondo Ni-laterite deposit (Dominican Republic), garnierites are found within the saprolite horizon mainly as fracture-fillings and thin coatings on joints. Field observations indicate an important role of active brittle t...
The Viloco vein field is hosted in black shales around a granitic intrusion. The paragenesis in these veins depend on their position with respect to the granites, with a domain of W-As-Bi-Cu in the intrusives or in their vicinity, an intermediate domain with Sn (cassiterite) and a distal enriched in Zn (sphalerite) and stannite domain. The order of...
The Poopó vein deposit in Bolivia is found on a regional fault. Deposition of the ore minerals is multiepisodic in association with the fault movement. A first generation of ore comprises pyrite, arsenopyrite, sphalerite and cassiterite. This ore formed contemporaneously with the fault activity and is brecciated. A second association is enriched in...
The paper presents both macroscopic and microstructural evidence of the water sensitivity of a low porosity clayey rock from Northern Spain. Particular emphasis is focused on the effects of water sensitivity at micro level. Results obtained from Environmental Scanning Electron Microscopy (ESEM) using the common procedure of sample preparation show...
Garnierites represent significant Ni ore minerals in the many Ni-laterite deposits worldwide. The occurrence of a variety of garnierite minerals with variable Ni content poses questions about the conditions of their formation. From an aqueous-solution equilibrium thermodynamic point of view, the present study examines the conditions that favor the...
Garnierites represent significant Ni ore mineral in the many Ni-laterite deposits worldwide. The occurrence of a variety of garnierite minerals with variable content of Ni poses questions about the conditions of their formation. From an aqueous-solution equilibrium thermodynamic point of view, the present study examines, the conditions that favor t...
This paper focuses on the lateritic profile of San Felipe (Cuba) and has two specific objectives: a) its geochemical and mineralogical study and b) the design of experimental experiences to separate mineral phases falling in a viscous fluid.
The characterization of the San Felipe profile matches clay deposits type, which have silica contents remai...
RESUMEN Numerosos taludes constituidos por rocas blandas presentan problemas de estabilidad debido al proceso de degradación progresiva de las mismas. Presentamos un análisis sobre el papel de las características mineralógicas y texturales en la durabilidad de las rocas blandas. Para ello, se han tomado muestras de 45 taludes distribuidos en distin...
A variety of metaultramafic (serpentinite) rocks in La Corea mélange, Sierra de Cristal, eastern Cuba, show differences in chemical, textural and mineralogical characteristics demonstrating a variety of protoliths. The mélange originated during the Cretaceous as part of the subduction channel associated with the Caribbean island arc. This mélange c...
Large-scale gas seepage and fluid ejection features are described from the edges of the active pull-apart Wagner and Consag basins (northern Gulf of California, Mexico), at water depths between ∼ 65 and 150 m. Gas vents, pockmarks, possible mud volcanoes, pyrite- and barite-rich sediments, slabs of lithified shell debris, and chemosynthetic fauna w...
sepiolita niquelífera pertenecientes a vetas de garnierita (silicatos hidratados de Ni y Mg) que aparecen en los depósitos de lateritas de níquel del centro de la República Dominicana. Los depósitos se han formado por la meteorización química de las peridotitas de Loma Caribe. Se trata, principalmente, de hazburgitas con dunitas subordinadas y lher...
En el Pirineo existen abundantes depósitos de tipo red bed (Kyser y Cuney, 2009) encajados en las series del Triásico inferior. La mayor parte de estos indicios fueron investigados para la explotación de U en los años 1950 (Arribas, 1966). La mina Eureka, precisamente, fue la primera mina de U explotada en España, si bien pronto se clasificó como n...
New chemical and structural data on sepiolite-falcondoite in garnierite veins from the Falcondo Ni-laterite deposits, central Dominican Republic, are reported. Samples of Ni-sepiolitefalcondoite vary in colour from whitish green to green depending on the NiO content (wt.%) and the amount of silica present. The texture is normally schistose and fria...