Cristina Villanova-de-Benavent

Cristina Villanova-de-Benavent
University of Barcelona | UB · Department of Mineralogy Petrology and Applied Geology

Geologist, MSc, PhD

About

87
Publications
30,412
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523
Citations
Citations since 2017
50 Research Items
459 Citations
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
Introduction
Ore deposits geologist and mineralogist. My research interests cover the mineralogy and formation processes of various ore deposits including Fe-Ti-V oxide ores, hydrous silicate Ni-Co-laterites, REE in karst bauxites and ion-adsorption deposits, and Au in listvenites, among others.
Additional affiliations
February 2018 - July 2019
University of Brighton
Position
  • Research Associate
February 2015 - September 2017
University of Barcelona
Position
  • Professor (Associate)
February 2015 - September 2017
University of Barcelona
Position
  • Lecturer

Publications

Publications (87)
Article
Ni-bearing magnesium phyllosilicates (garnierites) are significant Ni ores in Ni-laterites worldwide. The present paper reports a detailed TEM investigation of garnierites from the Falcondo Ni-laterite deposit (Dominican Republic). Different types of garnierites have been recognized, usually consisting of mixtures between serpentine and talc-like p...
Article
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...
Article
Full-text available
Cerro de Maimón, in the central Dominican Republic, is currently the only VMS deposit under production in the Caribbean region. It is hosted in the Maimón Formation, of early Cretaceous age, which is part of the oldest and chemically most primitive island-arc in the Caribbean. From bottom to top, this deposit can be divided into (i) a primary sulfi...
Conference Paper
Full-text available
The Kunene Complex, outcropping between SW Angola and NW Namibia, is one of the biggest Proterozoic anorthositic complexes in the world [1]. It is cut by a set of Ti-Fe oxide dykes or lenticular bodies, which are hectometric to kilometric in length and metric to decametric in width. The mineral associations of four oxide bodies have been studied: D...
Article
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The Virulundo carbonatite in Angola is one of the largest in the world and contains pyrochlore as an accessory mineral in all of the carbonatite units (calciocarbonatites, ferrocarbonatites, carbonatite breccias and trachytoids). The primary magmatic pyrochlore is fluorine dominant and typically contains about equal molar quantities of Ca and Na at...
Article
The Hamutenha intrusion (Huíla province, SW Angola) is a 3-km-long elongated magmatic body defined by a set of two intrusive units. The northern unit is formed by alternating bands of dunites and olivine gabbros, while the southern unit is composed of amphibole diorites. The Hamutenha body is hosted by the Paleoproterozoic Epupa Complex in the Ango...
Article
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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...
Article
In this study we tested the dissolution kinetics of three garnierite types (serpentine-, talc- and sepiolite-dominated) at pH of 3 and 5 and room temperature by means of flow-through experiments. The samples selected for the study cover a wide range of mineralogical composition (Xtalc, between 0.34 and 0.78) and Ni content (between 0.8 and 2.4 atom...
Conference Paper
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Germanium is a critical raw material in increasing demand. Mississippi Valley-type (MVT) deposits represent an important source of Ge. This research provides new textural and compositional data of sphalerite from the San Vicente and Shalipayco MVT deposits in Peru. In San Vicente, seven textural types of sphalerite, deposited during two steps of mi...
Conference Paper
Full-text available
The mineralogy and mineral chemistry of REE phosphates and REE carbonates has been investigated in three localities of the Bahoruco karst bauxites, Dominican Republic, by means of powder X-ray diffraction (XRD), petrographic microscopy, scanning electron microscopy (SEM-EDS) and electron microprobe (EMP). The identified REE minerals include primary...
Article
The nickel laterite mining industry faces lower recovery rates related to low ore grades, multiple nickel carrying minerals, as well as lateral and vertical heterogeneities at ore deposit scale. Garnierite, a complex mixture of nickel-bearing phyllosilicates, occurs at the base of nickel laterite profiles. Samples of Ni-rich and Ni-poor phyllosilic...
Article
Full-text available
Fe-Ti oxide ores are commonly associated with Proterozoic massif-type anorthosite bodies emplaced during the Grenville orogeny (~1.2-1.0 Ga). Some of these anorthositic bodies occur in the northernmost part of the Santa Marta Massif, Colombia. They locally contain crosscutting Fe-Ti(-V) ore bodies between the El Hierro creek and the Don Dieguito ri...
Article
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Nickel laterite deposits developed on ultramafic rocks have traditionally been a significant source of Ni and Co and recently of Sc. Although the Loma de Hierro deposit (Venezuela) has been in operation for more than 50 years, it lacks detailed studies on the mineralogical and geochemical composition of the lateritic profile. In this study, we pres...
Article
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Global resources of heavy Rare Earth Elements (REE) are dominantly sourced from Chinese regolith-hosted ion-adsorption deposits in which the REE are inferred to be weakly adsorbed onto clay minerals. Similar deposits elsewhere might provide alternative supply for these high-tech metals, but the adsorption mechanisms remain unclear and the adsorbed...
Article
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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...
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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...
Article
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RESUMEN La minería de los recursos de hierro del área de Gavà (Cataluña) fue activa de forma intermitente durante las épocas Ibérica y Romana, la Edad Media, y hasta la era industrial, lo cual se ha probado mediante datos arqueológicos y documentos históricos. Es posible que, inclusive, la minería de hierro en el área haya existi-do durante el peri...
Article
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RESUMEN El Complejo Minero Neolítico de Gavà (CMNG) ubicado en Cataluña tuvo como objeto la explotación de la variscita verde utilizada para la elaboración de adornos y joyería. Los trabajos arqueológicos en más de 100 minas indican que la minera en este complejo se llevó a cabo ~5800 años antes del presente. CMNG constituye (A) uno de los primeros...
Article
Ni-Mg-phyllosilicates, so-called “garnierites”, are significant Ni ores in Ni-laterite deposits worldwide. In addition, they are the natural analogues of synthetic catalysts involving Ni and phyllosilicate substrates used in reactions for the remediation of greenhouse gases. However, the nomenclature, classification and characterisation of Ni-Mg-ph...
Article
Full-text available
Karst bauxite deposits are currently investigated as a new resource for rare earth elements (REE) in order to avoid present and future supply shortfalls of these critical metals. The present work focuses on the geochemistry and mineralogy of the REE in karst bauxite deposits of the Catalan Coastal Range (CCR), NE-Spain. It is revealed that the stud...
Conference Paper
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...
Article
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The Kunene Intrusive Complex (KIC), in NW Namibia and SW Angola, is one of the largest Proterozoic anorthosite massif-type exposures in the world. A geochemical, mineralogical and petrological study of four Fe–Ti(–V) oxide bodies located in the understudied Angolan part of the KIC has been performed. The massive Fe–Ti(–V) oxide bodies, locally apat...
Article
Full-text available
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...
Article
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Oxide-type Ni-laterite deposits are characterized by a dominant limonite zone with goethite as the economically most important Ni ore mineral and a thin zone of hydrous Mg silicate-rich saprolite beneath the magnesium discontinuity. Fe, less soluble, is mainly retained forming goethite, while Ni is redeposited at greater depth in a Fe(III) and Ni-r...
Article
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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...
Conference Paper
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The Loma Caribe peridotite belt (Central Cordillera, Dominican Republic) is the largest exposure of oceanic mantle in the island of Hispaniola. It consists of peridotites that record partial melting associated with the development of the Greater Antilles island arc during Early Cretaceous times. Small pods of massive chromitite (up to 10 m in lengt...
Conference Paper
Full-text available
Karst bauxite ore samples (n=37) from active and inactive mining sites from Sierra de Bahoruco, SW Dominican Republic, have been investigated for their potential to host REE. Geochemical whole rock analyses reveal elevated contents up to ~0.5 wt.% total REE with LREE/HREE ratios from ~1 to ~25 (average ~8). Hydroseparation techniques in combination...
Article
Bauxite deposits, traditionally the main source of aluminum, have been recently targeted for their remarkable contents in rare earth elements (REE). With ƩREE (lanthanoids + Sc + Y) concentrations systematically higher than ~ 1400 ppm (av. = 1530 ppm), the Las Mercedes karstic bauxites in the Dominican Republic rank as one of the REE-richest deposi...
Article
Full-text available
The Sierra del Convento and La Corea mélanges (eastern Cuba) are vestiges of a Cretaceous subduction channel in the Caribbean realm. Both mélanges contain blocks of oceanic crust and serpentinite subducted to high pressure within a serpentinite matrix. The bulk composition of serpentinite indicates spinel-harzburgite and -herzolite protoliths. The...
Article
Ni-bearing serpentines and garnierites (Ni-bearing Mg-phyllosilicates) are the main Ni ores in the Falcondo Ni-laterite deposit (Dominican Republic). In the present paper a set of garnierite samples and the associated Ni-bearing serpentines with characteristic mineral compositions and textures, from the saprolite horizon, were studied by EMPA, μXRF...
Article
Ni-bearing magnesium phyllosilicates (garnierites) are significant Ni ores in Ni-laterites worldwide. The present paper reports a detailed TEM investigation of garnierites from the Falcondo Ni-laterite deposit (Dominican Republic). Different types of garnierites have been recognized, usually consisting of mixtures between serpentine and talc-like p...
Conference Paper
Full-text available
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...
Conference Paper
Full-text available
Listvenites are carbonatised serpentinites occurring along faults in ophiolite complexes, which are commonly associated with gold, and sulphide-arsenide mineralisations. The origin of the ores is probably due to the metasomatism of the previous ultramafic rocks by CO2-rich hydrothermal fluids during obduction, but the processes leading to the forma...
Conference Paper
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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...
Conference Paper
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The Pb-Zn-Ag-(Sn) deposits of the Emilia and Brunita mines were formed by replacement of Triassic carbonate levels that are part of an Alpine thrust sheet, by the circulation of hydrothermal fluids related to Miocene subvolcanic intrusives. Emilia and Brunita mines are located in a distal position by rapport to the intrusives. Primary paragenesis w...