J. Roqué

Universitat de Barcelona

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Joaquín A. Proenza

Universitat de Barcelona

José María González-Jiménez

Instituto Andaluz de Ciencias de la Tierra

Fernando Nieto

Universidad de Granada

Fernando Gervilla

Universidad de Granada

Salvador Galí

Universitat de Barcelona

Júlia Farré-de-Pablo

Universitat de Barcelona

Abigail Jiménez–Franco

Universitat de Barcelona

Antonio García‐Casco

Universidad de Granada

Antonio Sánchez‐Navas

Universidad de Granada

M. Vendrell‐Saz

Universitat de Barcelona

Cooperative Institutions

Universitat de Barcelona

Universidad de Granada

Consejo Superior de Investigaciones Científicas

Instituto Andaluz de Ciencias de la Tierra

Centre National de la Recherche Scientifique

Universidad Nacional Autónoma de México

Universidad de Zaragoza

Diamond Light Source

Universitat Politècnica de Catalunya

Mineral Resources

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Ni-bearing phyllosilicates (“garnierites”): New insights from thermal analysis, μRaman and IR spectroscopy

Applied Clay Science (2019)

Cristina Villanova-de-Benavent T. Jawhari J. Roqué Salvador Galí Joaquín A. Proenza

Talc

Sepiolite

10.1016/j.clay.2019.03.036

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Citations (14)

Predicting soil classes with parameters derived from relief and geologic materials in a sandstone region of the Vosges mountains (Northeastern France)

Geoderma (1999)

A.L. Thomas D. King Étienne Dambrine Alain Couturier J. Roqué

Bedrock

Sequence (biology)

Geologic map

Landform

Soil horizon

10.1016/s0016-7061(98)00135-9

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Citations (53)

Diamantes en cromititas ofiolíticas: no siempre una evidencia de ultra-alta presión

Macla: revista de la Sociedad Española de Mineralogía (2019)

Júlia Farré-de-Pablo Joaquín A. Proenza José María González Jiménez Antonio García‐Casco Vanessa Colas Gines

En los ultimos anos, se han descrito diamantes en cromititas ofioliticas y rocas asociadas de distintas ofiolitas del mundo. En la mayoria de casos, los diamantes se encontraron en concentrados minerales y, en muy pocos casos, in situ. Para explicar la presencia de los diamantes en estas rocas se han propuesto una serie de modelos que implican formacion o reciclado de cromititas cerca de la zona de transicion del manto, alrededor de 410–600 km de profundidad, o incluso a profundidades mayores (e.g. Yang et al., 2015; McGowan et al., 2015). Sin embargo, en ningun caso se considera la formacion de diamante metaestable a bajas presiones, pese a que existen varios estudios y evidencias sobre la metaestabilidad de diamante en condiciones someras de la litosfera (e.g. Manuella, 2013). En este estudio presentamos el hallazgo de diamantes in situ en cromititas ofioliticas incluidas en la serpentinita de Tehuitzingo (sur de Mexico), asi sus relaciones texturales y mineralogicas. Nuestros resultados sugieren que la presencia de diamante en cromititas ofioliticas no necesariamente indica la existencia de condiciones alta presion durante su cristalizacion.

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A shallow origin for diamonds in ophiolitic chromitites

Geology (2018)

Júlia Farré-de-Pablo Joaquín A. Proenza José María González-Jiménez Antonio García‐Casco Vanessa Colás

Research Article| December 07, 2018 A shallow origin for diamonds in ophiolitic chromitites Júlia Farré-de-Pablo; Júlia Farré-de-Pablo 1Department of Mineralogy, Petrology and Applied Geology, University of Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain Search for other works by this author on: GSW Google Scholar Joaquín A. Proenza; Joaquín A. Proenza 1Department of Mineralogy, Petrology and Applied Geology, University of Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain Search for other works by this author on: GSW Google Scholar José María González-Jiménez; José María González-Jiménez 2Department of Mineralogy and Petrology, Faculty of Sciences, University of Granada, Avenida Fuentenueva s/n, 18002 Granada, Spain Search for other works by this author on: GSW Google Scholar Antonio Garcia-Casco; Antonio Garcia-Casco 2Department of Mineralogy and Petrology, Faculty of Sciences, University of Granada, Avenida Fuentenueva s/n, 18002 Granada, Spain3Andalusian Earth Science Institute (IACT), Spanish Research Council (CSIC)–University of Granada, Avenida de las Palmeras, 4, 18100 Armilla, Granada, Spain Search for other works by this author on: GSW Google Scholar Vanessa Colás; Vanessa Colás 4Institute of Geology, National Autonomous University of Mexico, Ciudad Universitaria, 04510 Ciudad de México, Mexico Search for other works by this author on: GSW Google Scholar Josep Roqué-Rossell; Josep Roqué-Rossell 1Department of Mineralogy, Petrology and Applied Geology, University of Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain Search for other works by this author on: GSW Google Scholar Antoni Camprubí; Antoni Camprubí 4Institute of Geology, National Autonomous University of Mexico, Ciudad Universitaria, 04510 Ciudad de México, Mexico Search for other works by this author on: GSW Google Scholar Antonio Sánchez-Navas Antonio Sánchez-Navas 2Department of Mineralogy and Petrology, Faculty of Sciences, University of Granada, Avenida Fuentenueva s/n, 18002 Granada, Spain3Andalusian Earth Science Institute (IACT), Spanish Research Council (CSIC)–University of Granada, Avenida de las Palmeras, 4, 18100 Armilla, Granada, Spain Search for other works by this author on: GSW Google Scholar Author and Article Information Júlia Farré-de-Pablo 1Department of Mineralogy, Petrology and Applied Geology, University of Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain Joaquín A. Proenza 1Department of Mineralogy, Petrology and Applied Geology, University of Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain José María González-Jiménez 2Department of Mineralogy and Petrology, Faculty of Sciences, University of Granada, Avenida Fuentenueva s/n, 18002 Granada, Spain Antonio Garcia-Casco 2Department of Mineralogy and Petrology, Faculty of Sciences, University of Granada, Avenida Fuentenueva s/n, 18002 Granada, Spain3Andalusian Earth Science Institute (IACT), Spanish Research Council (CSIC)–University of Granada, Avenida de las Palmeras, 4, 18100 Armilla, Granada, Spain Vanessa Colás 4Institute of Geology, National Autonomous University of Mexico, Ciudad Universitaria, 04510 Ciudad de México, Mexico Josep Roqué-Rossell 1Department of Mineralogy, Petrology and Applied Geology, University of Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain Antoni Camprubí 4Institute of Geology, National Autonomous University of Mexico, Ciudad Universitaria, 04510 Ciudad de México, Mexico Antonio Sánchez-Navas 2Department of Mineralogy and Petrology, Faculty of Sciences, University of Granada, Avenida Fuentenueva s/n, 18002 Granada, Spain3Andalusian Earth Science Institute (IACT), Spanish Research Council (CSIC)–University of Granada, Avenida de las Palmeras, 4, 18100 Armilla, Granada, Spain Publisher: Geological Society of America Received: 26 Sep 2018 Revision Received: 12 Nov 2018 Accepted: 20 Nov 2018 First Online: 11 Dec 2018 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2018 Geological Society of America Geology (2019) 47 (1): 75–78. https://doi.org/10.1130/G45640.1 Article history Received: 26 Sep 2018 Revision Received: 12 Nov 2018 Accepted: 20 Nov 2018 First Online: 11 Dec 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Júlia Farré-de-Pablo, Joaquín A. Proenza, José María González-Jiménez, Antonio Garcia-Casco, Vanessa Colás, Josep Roqué-Rossell, Antoni Camprubí, Antonio Sánchez-Navas; A shallow origin for diamonds in ophiolitic chromitites. Geology 2018;; 47 (1): 75–78. doi: https://doi.org/10.1130/G45640.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Recent findings of diamonds in ophiolitic peridotites and chromitites challenge our traditional notion of Earth mantle dynamics. Models attempting to explain these findings involve incorporation of diamonds into chromite near the mantle transition zone. However, the occurrence of metastable diamonds in this context has not been considered. Here, we report for the first time in situ microdiamonds in chromite from ophiolitic chromitite pods hosted in the Tehuitzingo serpentinite (southern Mexico). Here, diamonds occur as fracture-filling inclusions along with quartz, clinochlore, serpentine, and amorphous carbon, thus indicating a secondary origin during the shallow hydration of chromitite. Chromite chemical variations across the diamond-bearing healed fractures indicate formation during the retrograde evolution of chromitite at temperatures between 670 °C and 515 °C. During this stage, diamond precipitated metastably at low pressure from reduced C-O-H fluids that infiltrated from the host peridotite at the onset of serpentinization processes. Diamond was preserved as a result of fracture healing at the same temperature interval in which the chromite alteration began. These mechanisms of diamond formation challenge the idea that the occurrence of diamond in ophiolitic rocks constitutes an unequivocal indicator of ultrahigh-pressure conditions. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

Garcia

10.1130/g45640.1

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Citations (46)

Magmatic platinum nanoparticles in metasomatic silicate glasses and sulfides from Patagonian mantle xenoliths

Contributions to Mineralogy and Petrology (2019)

José María González-Jiménez J. Roqué Abigail Jiménez–Franco Santiago Tassara Fernando Nieto

Metasomatism

Mineral redox buffer

Peridotite

Pentlandite

10.1007/s00410-019-1583-5

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Citations (35)

Ni-phyllosilicates (garnierites) from the Falcondo Ni-laterite deposit (Dominican Republic): Mineralogy, nanotextures, and formation mechanisms by HRTEM and AEM

American Mineralogist (2016)

Cristina Villanova-de-Benavent Fernando Nieto Cecilia Viti Joaquín A. Proenza Salvador Galí

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 phases that display a wide range of textures at the nano-meter scale. In particular, chrysotile tubes, polygonal serpentine, and lizardite lamellae are intergrown with less crystalline, talc-like lamellae. Samples consisting uniquely of talc-like and of sepiolitefalcondoite were also observed, occurring as distinctive thin lamellae and long ribbon-shaped fibers, respectively. HRTEM imaging indicates that serpentine is replaced by the talc-like phase, whereas TEM-AEM data show preferential concentration of Ni in the talc-like phase. We suggest, therefore, that the crystallization of Ni-bearing phyllosilicates is associated with an increase in the silica activity of the system, promoting the replacement of the Ni-poor serpentine by the Ni-enriched talc-like phase. These results have interesting implications in material science, as garnierites are natural analogs of Ni-bearing phyllosilicate-supported synthetic catalysts. Finally, SAED and HRTEM suggest that the Ni-bearing talc-like phase corresponds to a variety of talc with extra water, showing larger d001 than talc (i.e., 9.2–9.7 Å), described as "kerolite"-"pimelite" in clay mineral literature.

Talc

Laterite

10.2138/am-2016-5518

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Citations (29)

LUSTRE COLOUR AND SHINE FROM THE OLLERIES XIQUES WORKSHOP IN PATERNA (SPAIN), 13TH CENTURY AD: NANOSTRUCTURE, CHEMICAL COMPOSITION AND ANNEALING CONDITIONS*

Archaeometry (2007)

J. Roqué Judit Molera Josefina Pérez‐Arantegui Cristina Garés Calabuig J. Portillo

Lustre is a medieval ceramic decoration, corresponding to a nanostructured thin layer formed by metallic copper and silver nanocrystals embedded in a glass matrix, which required deep knowledge on the part of the artisans with regard to the raw materials used and the kiln conditions. Their empirical knowledge led to the achievement of colourful lustre decorations ranging from reddish to yellowish or even greenish, some of them with a metallic shine with an associated purplish iridescence. Lustre ceramics dating from the 13th century from the Olleries Xiques workshop in Paterna (Spain) have been studied, linking their chemical composition and nanostructure with their colours and shine. Two kinds of nanostructures are found, yellowish lustre decoration constituted by a silver metal–glass nanocomposite, and reddish lustre decoration constituted by metallic copper nanocrystals and copper oxide nanocrystals; in some cases, metallic copper nanocrystals covered with an oxidized shell of CuO and partly Cu 2 O have been found. However, even with significant amounts of copper oxide, the lustre still exhibits a copper metal‐like shine. The bluish iridescence observed at a specular angle in the lustre could not be explained completely by means of the chemical composition, and metallic silver nanoparticle light scattering is proposed as a possible explanation.

Lustre (file system)

Iridescence

Copper oxide

10.1111/j.1475-4754.2007.00317.x

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Citations (23)

Nanoscale constraints on the in situ transformation of Ru–Os–Ir sulfides to alloys at low temperature

Ore Geology Reviews (2020)

Abigail Jiménez–Franco José María González-Jiménez J. Roqué Joaquín A. Proenza Fernando Gervilla

10.1016/j.oregeorev.2020.103640

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Citations (13)

As and S speciation in a submarine sulfide mine tailings deposit and its environmental significance: The study case of Portmán Bay (SE Spain)

The Science of The Total Environment (2023)

Andrea Baza-Varas J. Roqué Miquel Canals Jaime Frigola Marc Cerdà-Domènech

The dumping of an estimated amount of 57 million tons of hazardous sulfide mine waste from 1957 to 1990 into Portmán's Bay (SE Spain) caused one of the most severe cases of persistent anthropogenic impact in Europe's costal and marine environments. The resulting mine tailings deposit completely infilled Portmán's Bay and extended seawards on the continental shelf, bearing high levels of metals and As. The present work, where Synchrotron XAS, XRF core scanner and other data are combined, reveals the simultaneous presence of arsenopyrite (FeAsS), scorodite (FeAsO₄·2H₂O), orpiment (As2S3) and realgar (AsS) in the submarine extension of the mine tailings deposit. In addition to arsenopyrite weathering and scorodite formation, the, the presence of realgar and orpiment is discussed, considering both potential sourcing from the exploited ores and in situ precipitation from a combination of inorganic and biologically mediated geochemical processes. Whereas the formation of scorodite relates to the oxidation of arsenopyrite, we hypothesize that the presence of orpiment and realgar is associated to scorodite dissolution and subsequent precipitation of these two minerals within the mine tailings deposit under moderately reducing conditions. The occurrence of organic debris and reduced organic sulfur compounds evidences the activity of sulfate-reducing bacteria (SRB) and provides a plausible explanation to the reactions leading to the formation of authigenic realgar and orpiment. The precipitation of these two minerals in the mine tailings, according to our hypothesis, has important consequences for As mobility since this process would reduce the release of As into the surrounding environment. Our work provides for the first time valuable hints on As speciation in a massive submarine sulfide mine tailings deposit, which is highly relevant for similar situations worldwide.

Arsenopyrite

Realgar

Authigenic

10.1016/j.scitotenv.2023.163649

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Citations (5)

Nanoscale partitioning of Ru, Ir, and Pt in base-metal sulfides from the Caridad chromite deposit, Cuba

American Mineralogist (2018)

José María González-Jiménez Artur P. Deditius Fernando Gervilla Martín Reich Alexandra Suvorova

We report new results of a combined focused ion beam and high-resolution transmission electron microscopy (FIB/HRTEM) investigation of platinum-group elements (PGE)-rich base-metal sulfides.The Ni-Fe-Cu base-metal sulfides (BMS) studied are millerite (NiS), pentlandite [(Ni,Fe) 9 S 8 ], pyrite (FeS 2 ), and chalcopyrite (CuFeS 2 ).These BMS were found forming composite inclusions (<60 mm across) within larger unaltered chromite from the Caridad chromite deposit, which is hosted in the mantle section of the Mayarí-Baracoa Ophiolite in eastern Cuba.Electron probe microanalysis of BMS revealed PGE values of up to 1.3 wt%, except for pentlandite grains where PGE concentrations can reach up to 12.8 wt%.Based on the amount of Ru, two types of pentlandite are defined: (1) Ru-rich pentlandite with up to 8.7 wt% of Ru and <3.5 wt% of Os, and (2) Ru-poor pentlandite with Ru <0.4 wt% and Os <0.2 wt%.Ru-rich pentlandite contains Ir-Pt nanoparticles, whereas the other sulfides do not host nanometer-sized platinum-group minerals (PGM).The Ir-Pt inclusions are found as: (1) idiomorphic, needle-shape (acicular) nanoparticles up to 500 nm occurring along the grain boundaries between Ru-rich pentlandite and millerite, and (2) nanospherical inclusions (<250 nm) dispersed through the matrix of Ru-rich pentlandite.HRTEM observations and analysis of the selected-area electron diffraction patterns revealed that nanoparticles of Ir-Pt form domains within Ru-rich pentlandite.Fast Fourier transform analyses of the HRTEM images showed epitaxy between Ir-Pt domain and PGE-poor millerite, which argues for oriented growth of the latter phase.These observations point to sub-solidus exsolution of the Ir-Pt alloy, although the presence of nanospherical Ir-Pt inclusions in some other grains suggest the possibility that Ir-Pt nanoparticles formed in the silicate melt before sulfide liquid immiscibility.These Ir-Pt nanocrystals were later collected by the sulfide melt, preceding the formation of Ru-rich pentlandite.Early crystallization of the Ru-rich pentlandite and Ir-Pt nanoparticles led to the efficient scavenging of PGE from the melt, leaving a PGE-poor sulfide residue composed of millerite, pyrite, chalcopyrite, and a second generation of PGE-poor pentlandite.

Chromite

Base metal

Base (topology)

10.2138/am-2018-6424

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Citations (16)