Trallero, C. (2020). El cálido abrazo de la música. Kit-book Servicios Editoriales.

Ressenya de: Trallero, C. (2020). El cálido abrazo de la música. Kit-book Servicios Editoriales. La càlida abraçada de la música.Review: Trallero, C. (2020). El cálido abrazo de la música. Kit-book Servicios Editoriales. The warm embrace of music

The enriched Variscan lithosphere of NE Iberia: data from postcollisional Permian calc-alkaline lamprophyre dykes of Les Guilleries

Post-collisional mafic dykes crosscut the Paleozoic metamorphic basement and late-Variscan plutons in Les Guilleries massif (Catalan Coastal Ranges, NE Iberia). The predominance of mafic phenocrysts, porphyritic texture, abundant amphibole, high MgO and volatile content, together with crustal-like trace-element patterns indicate that the dykes correspond to calc-alkaline lamprophyres, mainly spessartites. Their enrichment in LILE, HFSE and REE and initial Sr-Nd isotopic compositions (87Sr/86Sri between 0.70851 and 0.71127, epsilon Ndi between -5.23 and -4.63) are consistent with an enriched subcontinental lithospheric mantle source. U-Pb ages of matrix titanite crystals yield concordia ages of 262±7Ma, congruent with crosscutting relationships. Postmagmatic processes are evidenced by intense chloritization and albitization of the lamprophyres, together with systematic variations of Na2O vs SiO2, K2O, CaO, Ba, Rb, Cs, Pb, Sr, Tl, and Zn, and possibly the removal of F. The geochemical and geochronological data support an orogenic geochemical affinity, in accordance with the transitional tectonic regime between Variscan compression/transpression and post-collisional transtension/extension, related to the fragmentation of Pangea and thinning of the lithosphere. The lamprophyre dykes studied could represent the youngest pulse of Variscan orogenic magmatism and, therefore, mark its end in NE Iberia before the onset of the generalized Triassic extension

The enriched Variscan lithosphere of NE Iberia: data from postcollisional Permian calc-alkaline lamprophyre dykes of Les Guilleries

Post-collisional mafic dykes crosscut the Paleozoic metamorphic basement and late-Variscan plutons in Les Guilleries massif (Catalan Coastal Ranges, NE Iberia). The predominance of mafic phenocrysts, porphyritic texture, abundant amphibole, high MgO and volatile content, together with crustal-like trace-element patterns indicate that the dykes correspond to calc-alkaline lamprophyres, mainly spessartites. Their enrichment in LILE, HFSE and REE and initial Sr-Nd isotopic compositions (87Sr/86Sri between 0.70851 and 0.71127, ε Ndi between -5.23 and -4.63) are consistent with an enriched subcontinental lithospheric mantle source. U-Pb ages of matrix titanite crystals yield concordia ages of 262±7Ma, congruent with crosscutting relationships. Post-magmatic processes are evidenced by intense chloritization and albitization of the lamprophyres, together with systematic variations of Na2O vs SiO2, K2O, CaO, Ba, Rb, Cs, Pb, Sr, Tl, and Zn, and possibly the removal of F. The geochemical and geochronological data support an orogenic geochemical affinity, in accordance with the transitional tectonic regime between Variscan compression/transpression and post-collisional transtension/extension, related to the fragmentation of Pangea and thinning of the lithosphere. The lamprophyre dykes studied could represent the youngest pulse of Variscan orogenic magmatism and, therefore, mark its end in NE Iberia before the onset of the generalized Triassic extension. Calc-alkaline lamprophyre. Post-collisional dykes. Sr-Nd isotopes. Les Guilleries Massif. Catalan Coastal Ranges. Variscan Orogeny.KEYWORDSABSTRACTCitation: Mellado, E., Corbella, M., Navarro-Ciurana, D., Kylander-Clark, A., 2021. The enriched Variscan lithosphere of NE Iberia: data from post-collisional Permian calc-alkaline lamprophyre dykes of Les Guilleries

Trallero, C. (2020). El cálido abrazo de la música. Kit-book Servicios Editoriales.

Ser testimonis de quelcom que mereixi ser recordat és, com a mínim, una sort. I, en aquesta ocasió, podem considerar-nos afortunats que algú amb l'experiència i la formació de la Dra. Conxa Trallero ens faci partícips d'un tros de la seva vida: un regal en forma de llibre que no ens deixa indiferents

Origen de las dolomías en la zona de Riópar (SE España): implicaciones sobre la geología de la Zona Prebética

In the present study a petrographic description and C-O stable isotope data of dolostone occurrences at the Riópar area (Mesozoic Prebetic Zone) are presented. Results constrain the origin and dolomitization processes for each dolomitic unit providing new insights on the geology of the Prebetic. Dolostones are grouped in: i) large seismicscale stratabound dolostones hosted in limestones of Lower Jurassic, Middle Jurassic and Upper Cretaceous ages; and ii) stratabound and patchy dolostones hosted in a carbonatic sequence of Upper Jurassic to Lower Cretaceous age. Two dolomitizing origins have been distinguished: i) a low-temperature dolomitization originated from seawater (seismicscale stratabound dolomitized limestones); ii) a hydrothermal dolomitization originated by high temperature brines (stratabound and patchy dolomitized limestones). Results of this study can be used as a guide for other poorly known dolomitic areas in the Prebetic Zone.En este estudio se presenta la descripción petrográfica y los datos isotópicos de C y O de distintos cuerpos de dolomías en la zona de Riópar (Zona Mesozoica del Prebético). Los resultados obtenidos permiten acotar el origen de cada miembro dolomítico, aportando nuevos datos geológicos en el Prebético. Dichos cuerpos se agrupan en: i) dolomías estratiformes de gran extensión hospedadas en calizas del Jurásico Inferior y Medio, así como del Cretácico Superior; ii) dolomías de tipo estratiforme y en forma de parches hospedadas en una secuencia carbonatada del Jurásico Superior al Cretácico inferior. El origen de estas dolomitizaciones se atribuye a: i) interacción con agua marina presumiblemente a baja temperatura (dolomías estratiformes de gran extensión); ii) presencia de salmueras hidrotermales de alta temperatura (dolomías estratiformes y parcheadas). Estos resultados pueden servir de guía para otras áreas dolomitizadas poco estudiadas en la zona del Prebético.Depto. de Mineralogía y PetrologíaFac. de Ciencias GeológicasTRUEMinisterio de Economía y Competitividad (MINECO)pu

El abandono escolar prematuro. Proyecto RESL. El indicador RONI y su adaptación en Barcelona

The Inspectorate of Barcelona coordinates a project that FEAEC (European Forum of Educational Administrators of Catalonia) and six secondary schools are involved: Ernest Lluch, Miquel Tarradell, and La Guineueta (public schools) and Joan Pelegri, Proa, and Virolai (private schools founded by the state). This is a "Comenius Regio" Regional Development Programme 2013-2015 between Sheffield and Barcelona with reference to the theme: "Reducing Early School Leaving" (RESL). The Council of Europe establish Early School Leaving as "the percentage of young people between 18 and 24 years, at most, have passed the compulsory secondary education and not in education nor training continue". In our country, we are concerned about students who complete lower secondary education, although we cannot forget that the objectives of the Spanish and European political system success lie in universal upper secondary they can graduate. One of the products developed in the project has been the adaptation of RONI (an individual indicator of risk of dropouts) and its experimental application.La inspección de Barcelona coordina un proyecto en el que participan el FEAEC (Fórum Europeo de Administradores de la Educación de Cataluña) y seis centros docentes (Institutos: Ernest Lluch, La Guineueta y Miquel Tarradell y las escuelas concertadas: Joan Pelegrí, Proa i Virolai. Se trata de un Programa “Comenius regio” 2013-2015 de Desarrollo Regional entre Sheffield y Barcelona con referencia al tema: “Reducción del abandono escolar prematuro” (RESL: Reducing Early School Leaving). El Consejo de Europa establece con este concepto “el porcentaje de jóvenes entre 18 y 24 años que, como máximo, han superado la educación secundaria obligatoria y no continúan ni estudiando ni formándose”. En nuestro país nos sigue preocupando que puedan graduar los alumnos que terminan la ESO, aunque no podemos olvidar que los objetivos de la política española y europea sitúan el éxito del sistema en la universalización de la secundaria postobligatoria. Uno de los productos desarrollados en el proyecto, ha sido la adaptación del RONI (un indicador individual de riesgo de abandono) y su aplicación experimental

The effect of anode support on the electrochemical performance of microtubular solid oxide fuel cells fabricated by gel-casting

Different cell configurations of anode-supported microtubular solid oxide fuel cells (mT-SOFCs) using samaria-doped ceria (SDC) as the electrolyte were fabricated. Several cells were processed varying the porosity and wall thickness (outer diameter) of NiOSDC tubular supports. Suitable aqueous slurry formulations of NiOSDC for gel-casting were prepared using agarose, as a gelling agent, and sucrose, as a pore former. The subsequent NiOSDC anode functional layer (AFL), the SDC electrolyte and the La0.6Sr0.4Co0.2Fe0.8O3-dSDC cathode were deposited by spray-coating. Pre-sintering temperatures of the supports were optimized from linear shrinkage curves, thus obtaining after co-sintering, a dense electrolyte without anode-electrolyte delamination. Electrochemical characterization of mT-SOFC cells fabricated by agarose gel-casting is reported by the first time. The cell with a support of 2.6 mm diameter, 380 mm wall thickness, an active area of 1 cm2 and added porosity, using 10 wt% sucrose, achieved a maximum power density of about 400 mW cm2 at 650 ºC

Petrography and geochemistry of fault-controlled hydrothermal dolomites in the Riópar area (Prebetic Zone, SE Spain)

The present paper reports the first detailed petrographical and geochemical studies of hydrothermal dolomites related to MVT Zn-(Fe-Pb) deposits in the Riópar area (Mesozoic Prebetic Basin, SE Spain), constraining the nature, origin and evolution of dolomitizing and ore-forming fluids. Mapping and stratigraphic studies revealed two stratabound dolostone geobodies connected by other patchy bodies, which replace carbonate units of Upper Jurassic to Lower Cretaceous ages. These dolostones are associated to the W-E trending San Jorge fault, indicating a main tectonic control for fluid flow. Seven different dolomite types were identified: i) matrix-replacive planar-s (ReD-I); ii) matrix-replacive planar-e (ReD-II); iii) planar-e sucrosic cement (SuD); iv) non-planar grey saddle dolomite cement (SaD-I) pre-dating Zn-(Fe-Pb) sulfides; v) non-planar milky to pinkish saddle dolomite cement (SaD-II) post-dating Zn-(Fe-Pb) ores; vi) ore-replacive planar-e porphyrotopic (PoD); and vii) planar-s cloudy cement (CeD). Meteoric calcite types were also recognized. The different dolomite types are isotopically characterized by: i) depleted δ18O (from +25.1 to +27.6¿ V-SMOW) and δ13C (from -2.3 to +0.9¿ V-PDB) values compared to Upper Jurassic to Lower Cretaceous limestone signature (δ18O: +27.6 to +30.9¿ V-SMOW; δ13C: +0.5 to +3.2¿ V-PDB); and ii) 87Sr/86Sr ratios for the main dolomitization phases (ReD and SuD: 0.70736-0.70773) close to the Jurassic and Cretaceous carbonate values (0.70723-0.70731) whereas more radiogenic values (0.70741-0.70830) for saddle dolomites (SaD) related to the Zn-(Fe-Pb) sulfide mineralization prevailed after fluid interaction with Rb-bearing minerals. Microthermometrical studies on two-phase liquid and vapor fluid inclusion populations in planar and non-planar dolomites and sphalerite show homogenization temperatures between 150 and 250ºC. These data indicate that both planar and non-planar dolomite textures formed at high-temperatures under hydrothermal conditions in deep-burial diagenetic environments. The main dolomitizing phase (ReD-I/ReD-II and SaD-I) shows low to moderate fluid inclusions salinity (5 to 14 wt.% eq. NaCl), whereas the dolomitization related to ore precipitation (sphalerite and SaD-II) spreads to higher salinity values (5 to 25 wt.% eq. NaCl). These data may respond to a mixing between a low salinity fluid (fluid A, less than 5 wt.% eq. NaCl) and a more saline brine (fluid B, more than 25 wt.% eq. NaCl) at different fluid proportions

Sulfur and lead isotope systematics: Implications for the genesis of the Riópar Zn-(Fe-Pb) carbonate-hosted deposit (Prebetic Zone, SE Spain)

The Zn-(Fe-Pb) deposits of the Riópar area (Prebetic Zone, SE Spain) are hosted by dolostones that replace Berriasian to Valanginian (Upper Jurassic-Lower Cretaceous) limestones. Mineralization consists of hypogene sphalerite, marcasite and galena, and supergene calamine zones. The hypogene ores are associated with a saddle dolomite gangue. The ore bodies occur as discordant and stratiform lenses, ore-cemented breccias, cm- to mm-wide veins and veinlets, disseminations and stylolite porosity filling within the host dolomites. The main ore controls include stratigraphy and/or lithology, tectonics (faults, fractures and breccias) and availability of metals and sulfur. The morphologies and epigenetic character of the hypogene ore bodies are consistent with the classification of this mineralization as a Mississippi Valley-type (MVT) deposit. The Ga/Ge geothermometer in sphalerite yielded a temperature range of 194-252ºC, which represents the temperature of the source region of the ore solution. This value is comparable to the temperature obtained in the ore deposition site, 159±15ºC from the Δ34S geothermometer in sphalerite galena pairs. This similitude points to a hydrothermal fluid that did not cool down significantly during flow from the fluid reservoir area to the precipitation site. δ34S values of base-metal sulfides (-7.5 to +3.5 ¿) are consistent with thermochemical reduction of Triassic sulfate (seawater and/or derived from dissolution of evaporites) by interaction with organic compounds (e.g., hydrocarbons, methane), which reduced sulfate to sulfide in the deposition site. The lead isotope ratios (206Pb/204Pb = 18.736-18.762; 207Pb/204Pb = 15.629-15.660; 208Pb/204Pb = 38.496-38.595) of galena suggest that Pb, and probably other metals as Zn, is derived from continental crustal rocks. On the other hand, these relations points to an unique metal source probably derived from the Paleozoic basement rocks. The relationship between bedding-parallel stylolites, dolomitization, sulfide precipitation and Alpine tectonic affecting the MVT ore, suggests a relative timing range for the mineralization in the Riópar area of 95 to 20 Ma (Upper Cretaceous-Tertiary). The sulfide mineralization and the associated dolomitization are thus explained by the contribution of two fluids that mixed in different proportions during dolomitization and mineralization: i) a fluid probably derived from Cretaceous seawater saturating Mesozoic sediments (Fluid A), characterized by being dilute and initially low temperature, which should have contained organic rich compounds in the ore deposition site (e.g., hydrocarbons and CH4 dissolved gas); and ii) a high salinity hydrothermal brine (Fluid B) rich in both metals and sulfate, circulated through the Paleozoic basement. During the pre-ore dolomitizing stage the fluid phase was dominated by the diluted fluid (Fluid A > Fluid B), whereas in a later fluid pulse, the proportion of the high salinity fluid increased (Fluid A < Fluid B) which allowed sulfide precipitation. MVT exploration in the Prebetic Zone should focus towards the SW of the Riópar mines, in the vicinity of the Alto Guadalquivir-San Jorge fault