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  • Occurrence of Fe–Mg-rich smectites and corrensite in the Morrón de Mateo bentonite deposit (Cabo de Gata region, Spain): A natural analogue of the bentonite barrier in a radwaste repository
    OAI: open archives initiativeTipo de documento: artículoColección E-prints Colección: Archivo institucional e-prints complutense
    • Título de publicación: Applied geochemistry
    • Autor: García Romero, Emilia;Labajo Rodillana, Miguel A.;Pelayo Bayón, Marta;Pérez del Villar Guillén, L.
    • Resumen: The Morrón de Mateo bentonite deposit is being studied as a natural analogue of the thermal and geochemical effects on a bentonite barrier in a deep geological repository of high level radioactive wastes. This bentonite deposit and its host rocks were intruded by a rhyodacitic volcanic dome that induced a hydrothermal metasomatic
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    • process affecting the biocalcarenite beds close to the dome. In this work, the mineralogical and chemical features of the clay minerals of the hydrothermally altered pyroclastic (white tuffs) and epiclastic rocks (mass flow), located in the NE sector of the Morrón de Mateo deposit are described. White tuffs have a high content of phyllosilicates, mainly composed of dioctahedral smectites, while mass flow have a higher proportion of inherited minerals, the neoformed phyllosilicates are dioctahedral smectites and an interlayer chlorite/smectite mineral of corrensite type. The chemical composition of smectites reflects the different nature of the parent rocks, in such a way that smectites from white tuffs have a quite homogeneous chemical composition and their structural formulae correspond to montmorillonite type, while smectites from mass flow show more chemical variability, higher Fe and Mg contents and a mean structural formulae corresponding to Fe–Mg-rich beidellite and/or to an intermediate smectite member between beidellite and saponite. In addition, chemical composition and textural features of corrensite-like clay minerals in relation to Fe–Mg-rich smectites in the samples have also been studied, suggesting that the former seems to be formed from Fe–Mg-rich smectites. The presence of corrensite in the epiclastic rocks suggests that in the Morrón de Mateo area a hydrothermal alteration process occurred after bentonite formation, which transformed Fe–Mg-rich smectites into corrensite. This transformation was probably favoured by the intrusion of the Morrón de Mateo volcanic dome, which produced a temperature increase in the geological media and a supply of Fe–Mg-rich solutions. These physicochemical conditions were also responsible for the metasomatic transformations observed in the biocalcarenite beds located on the top of the bentonite deposit. All these data suggest that the Morrón de Mateo natural system could be a good natural analogue of both thermal and chemical effects on a bentonite barrier related to the radioactive decay of fission products and the interaction between the corrosion products of steel over-packs and the bentonite. These circumstances would favour the transformation of the candidate Al-rich smectites into Fe–Mg-rich smectites and corrensite, as steps prior to formation of chlorite. In this case, all the physicochemical and mechanical properties of Al-rich smectites would disappear and the clayey barrier would fail.
    • Palabras clave: Smectites; Bentonite deposits; Cabo de Gata (Spain)
    • Materia: Geología
    • Identificador OAI: oai:www.ucm.es:13500
    • Tipo: Artículo
    • Editorial: Elsevier
    • Departamento: Fac. de CC. Geológicas - Depto. de Cristalografía y Mineralogía (Planta 6)
    • ISSN: 0883-2927
    • CDU: 549.6(460)







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  • Andalusite and Na- and Li-rich cordierite in the La Costa pluton, Sierras Pampeanas, Argentina: textural and chemical evidence for a magmatic origin
    OAI: open archives initiativeTipo de documento: artículoColección E-prints Colección: Archivo institucional e-prints complutense
    • Título de publicación: International journal of earth sciences
    • Autor: Alasino, Pablo H.;Casquet, César;Dahlquist, Juan A.;Galindo Francisco, Mª del Carmen;Saavedra, Julio
    • Resumen: The La Costa pluton in the Sierra de Velasco (NW Argentina) consists of S-type granitoids that can be grouped into three igneous facies: the alkali-rich Santa Cruz facies (SCF, SiO2 *67 wt%) distinguished by the presence of andalusite and Na- and Li-rich cordierite (Na2O = 1.55–1.77 wt% and Li2O = 0.14–0.66
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    • wt%), the Anillaco facies (SiO2 *74 wt%) with a significant proportion of Mn-rich garnet, and the Anjullo´n facies (SiO2 *75 wt%) with abundant albitic plagioclase. The petrography, mineral chemistry and whole-rock geochemistry of the SCF are compatible with magmatic crystallization of Na- and Li-rich cordierite, andalusite and muscovite from the peraluminous magma under moderate P–T conditions (*1.9 kbar and ca. 735C). The high Li content of cordierite in the SCF is unusual for granitic rocks of intermediate composition.
    • Palabras clave: Andalusite Na- and Li-rich cordierite S-type granite La Costa pluton Sierras Pampeanas
    • Materia: Geología
    • Identificador OAI: oai:www.ucm.es:11393
    • Tipo: Artículo
    • Editorial: Springer Science Business Media
    • Departamento: Fac. de CC. Geológicas - Depto. de Petrología y Geoquímica
    • ISSN: 1437-3254
    • CDU: 552(82)
    • Notas: The original publication is available at www.springerlink.com







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  • Dolomite in caves: Recent dolomite formation in oxic, non-sulfate environments. Castañar Cave, Spain
    OAI: open archives initiativeTipo de documento: artículoColección E-prints Colección: Archivo institucional e-prints complutense
    • Título de publicación: Sedimentary Geology
    • Autor: Alonso-Zarza, Ana María;Martín Pérez, Andrea
    • Resumen: Dolomite is a common mineral in the rock record but rare in recent superficial environments. Where it does occur, it is related to anoxic, sulfate-rich environments and microbial activity. The occurrence of some dolomite deposits in caves, however, indicates that dolomite formation is also possible in oxic, non-sulfate settings. Dolomite is forming at 17 °C and in oxic-vadose conditions
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    • on the host rocks and aragonite speleothems of the Castañar Cave, Cáceres, Spain. It appears as spheroids and dumbbells 50–300 μm in diameter that internally consist of micron-sized rhombic to rounded crystals. Initially this dolomite is Carich, non-stoichiometric and poorly ordered. Mg-rich solutions allow the precipitation of metastable Mg-rich carbonates, such as huntite. This soon transforms into this Ca-rich dolomite, which later “ages” to form a more stoichiometric dolomite. These dolomites show similarities to those grown under anoxic, sulfate-rich conditions and their presence in caves provides a different setting that may contribute to the understanding of the “dolomite problem”, including their initial formation and later recrystallization processes.
    • Palabras clave: Dolomite, Caves, Huntite, Low-temperature, Recent, Castañar Cave, Spain
    • Materia: Geología
    • Identificador OAI: oai:www.ucm.es:10005
    • Tipo: Artículo
    • Editorial: Elsevier
    • Departamento: Fac. de CC. Geológicas - Depto. de Petrología y Geoquímica
    • ISSN: 0037-0738
    • CDU: 552.5







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  • Organic-Rich facies in the Sinemurian and Pliensbachian of the Lusitanian Basin, Portugal: Total organic carbon distribution and relation to transgressive-regressive facies cycles
    OAI: open archives initiativeTipo de documento: artículoColección E-prints Colección: Archivo institucional e-prints complutense
    • Título de publicación: Geologica acta
    • Autor: Comas Rengifo, María José;Duarte, Luís Vitor;Oliveira, Luiz Carlos Veiga de;Silva, Francisco;Silva, Ricardo
    • Resumen: The upper Sinemurian to Pliensbachian series of the Lusitanian Basin (Portugal) correspond to marly limestone sediments rich in benthic and nektonic macrofauna. This sedimentary record includes several intervals of organicrich facies, which are particularly well developed in the western sectors of the basin. They correspond
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    • to grey and dark marls locally showing strong lamination (black shale type) and are recognized as one of the most important potential oil source rocks. This study shows the vertical and lateral distribution of these organic-rich intervals, supported by over 550 total organic carbon (TOC) determinations. The results presented reveal two important intervals, with several black shale occurrences, in the Oxynotum(?)–Raricostatum (Polvoeira Member of Água de Madeiros Formation) and at the top of the Ibex-upper part of Margaritatus zones (top of the Vale das Fontes Formation), showing in the distal (western) sectors up to 22% and 15% TOC, respectively. TOC values decrease progressively towards the proximal sectors, the youngest organic-rich interval being the most expressive at the basin scale. This lateral TOC distribution, the facies stacking patterns and the decrease observed in benthic macrofauna confirm that these intervals are related to 2nd-order transgressive phases. 2nd-order regressive phases, developed during the uppermost Raricostatum and Spinatum zones respectively, show lower TOC values. TOC distribution combined with other stratigraphic and sedimentological parameters enabled seven facies maps to be created for the time interval studied. At the regional scale, this study shows for the first time the good similarity between the upper Sinemurian-Pliensbachian sedimentary successions of the Lusitanian and Basque- Cantabrian basins.
    • Palabras clave: Lower Jurassic, Organic-rich marls, TOC, Sequence stratigraphy, Palaeogeography, Lusitanian Basin.
    • Materia: Geología
    • Identificador OAI: oai:www.ucm.es:12186
    • Tipo: Artículo
    • Editorial: Instituto de Ciencias de la Tierra "Jaume Almera" (Barcelona)
    • Departamento: Fac. de CC. Geológicas - Depto. de Paleontología
    • ISSN: 1695-6133
    • CDU: 551.7(469)







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  • A new style of Ni-Cu mineralization related to magmatic breccia pipes in a transpressional magmatic arc, Aguablanca, Spain
    OAI: open archives initiativeTipo de documento: artículoColección E-prints Colección: Archivo institucional e-prints complutense
    • Título de publicación: Mineralium deposita
    • Autor: Canales Gallarosa, Ángel;Casquet, César;Galindo Francisco, Mª del Carmen;Tornos Arroyo, Fernando;Velasco Roldán, Francisco
    • Resumen: The Aguablanca deposit represents a new style of magmatic Ni Cu mineralization in discordant sulfide rich pyro xenitic breccia pipes. The orebody is hosted by Variscan calc alkaline diorites and gabbros which intruded during an oblique subduction/collision event. Transpressional transtensional left lateral
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    • structures facilitated the intrusion of primitive magmas to shallow depths in the crust. A two stage genetic model is proposed. In the first stage, a transitional deep magma chamber formed. The primitive magma interacted at depth with wall rocks, resulting in extensive crustal contamination, concomitant sulfide magma immiscibility and settling of orthopyroxene , clinopyrox ene and sulfide rich cumulates to form a layered magmatic complex. Geochemical and mineralogical evidence, including the virtual disappearance of olivine, heavy 34S values (7.4‰), distinctive Nd, Sr and Pb signatures, high Au contents, and the presence of spinel and graphite indicate a major interaction with the upper crust, probably with pyrite rich carbonaceous slates of Late Proterozoic age. The second stage was related with the emplacement of residual calc alkaline gabbroic to noritic melts and the development of an intrusive breccia containing fragments of the consolidated layered complex rocks and associated disseminated to massive sulfides
    • Palabras clave: Ni-Cu mineralitation; Aquablanca; Spain
    • Materia: Geología
    • Identificador OAI: oai:www.ucm.es:11814
    • Tipo: Artículo
    • Editorial: Springer Science Business Media
    • Departamento: Fac. de CC. Geológicas - Depto. de Petrología y Geoquímica
    • ISSN: 0026-4598
    • CDU: 549.3(460.253)







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  • Editor de Learning Design
    OAI: open archives initiativeColección E-prints Colección: Archivo institucional e-prints complutense
    • Autor: Hernández Gómez, Marco Antonio;Picó Sanchis, Esther;Rodríguez Sánchez, Laura
    • Colaborador: Fernández Manjón, Baltasar;Martínez Ortíz, Iván
    • Resumen: Learning Design trata de modelar la interacción del profesor con los alumnos dentro de un entorno de aprendizaje. Este modelado se lleva a cabo mediante la creación de una Unidad de Aprendizaje, en la que se definen un conjunto de actividades que deben llevar a cabo los alumnos y profesores por separado y en conjunto. El Graphical Editing Framework
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    • (GEF), consiste en un editor gráfico que utilizamos para modelar el diagrama de actividades. Una vez que tenemos el modelo, utilizamos UML2 junto con EMF para convertir este modelo en datos XML y lograr así su persistencia. A partir de éste, con JDOM, construimos un documento XML que se ajusta al patrón de Learning Design que utilizan otras herramientas como ReloadLD Editor. Finalmente construimos una aplicación independiente de Eclipse con las herramientas que nos proporciona la Rich Clent Platform (RCP). [ABSTRACT] Learning Design tries to model the interaction between the teacher and the students within a learning environment. This modelling is carried out by creating a Learning Unit, in which a set of activities are defined and carried out by the students and teachers separately and altogether. The Graphical Editing Framework (GEF), consists of a graphical editor that we use to model activity diagrams. Once we have the model, we use UML2 with EMF to turn this model into XML data and to obtain its persistence. From the XML data, using JDOM, we construct a XML document that adjusts to the pattern of Learning Design which is used by other tools like ReloadLD Editor. Finally, we construct an Eclipse independent application with the tools that Rich Clent Platform provides (RCP).
    • Palabras clave: Learning Design, Eclipse, GEF (Graphical Editing Framework), Draw2D, RCP (Rich Client Platform), EMF, (Eclipse Modelling Framework), UML2 (Unified Modeling Language), JDOM (Java Document Object Model), XML (Extensible Markup Language)
    • Materia: Informática
    • Identificador OAI: oai:www.ucm.es:9010
    • Tipo: Trabajo de curso
    • Departamento: Fac. de Informática - Depto. de Ingeniería de Software e I. A. - Lenguajes y Sistemas Informáticos
    • CDU: 004:37(043.3)
    • Notas: Trabajo de la asignatura de Sistemas Informáticos (Facultad de Informática, Curso 2005-2006)







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  • El Chichón Volcano (Chiapas Volcanic Belt, Mexico) Transitional Calc-Alkaline to Adakitic-Like Magmatism: Petrologic and Tectonic Implications
    OAI: open archives initiativeTipo de documento: artículoColección E-prints Colección: Archivo institucional e-prints complutense
    • Título de publicación: International geology review
    • Autor: Castiñeiras García, Pedro;Ignacio San José, Cristina de;Lillo Ramos, F. Javier;López Ruiz-Labranderas, Iván;Márquez González, Álvaro;Oyarzun Muñoz, Roberto
    • Resumen: The rocks of the 1982 eruption of El Chichón volcano (Chiapas, Mexico) display a series of geochemical and mineralogical features that make them a special case within the NW-trending Chiapas volcanic belt. The rocks are transitional between normal arc and adakitic-like
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    • trends. They are anhydrite-rich, and were derived from a water-rich, highly oxidized sulfur-rich magma, thus very much resembling adakitic magmas (e.g., the 1991 Pinatubo eruption). We propose that these rocks were generated within a complex plate tectonic scenario involving a torn Cocos plate (Tehuantepec fracture zone) and the ascent of hot asthenospheric mantle. The latter is supported by an outstanding negative S-wave anomaly widely extending beneath the zone, from 70 to 200 km in depth. The adakitic- like trend would be derived from the direct melting of subducting Cocos plate, whereas the transitional rocks would have resulted from the mixing of two poles, one reflecting a mantle source, and the other, the already mentioned adakitic melts. The basaltic source would also account for the high sulfur content and 34S values of the El Chichón system (about +5.8), as result of a contribution of SO2 in fluids released from an underlying mafic magma.
    • Palabras clave: El Chichón volcano; Magmatisme; Geochemical; Mexico
    • Materia: Geología
    • Identificador OAI: oai:www.ucm.es:14023
    • Tipo: Artículo
    • Editorial: Taylor & Francis
    • Departamento: Fac. de CC. Geológicas - Depto. de Petrología y Geoquímica
    • ISSN: 0020-6814
    • CDU: 552.3







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  • Geochemistry of mafic phenocrysts from alkaline lamprophyres of the Spanish Central System: implications on crystal fractionation, magma mixing and xenoliths entrapment within deep magma chambers
    OAI: open archives initiativeTipo de documento: artículoColección E-prints Colección: Archivo institucional e-prints complutense
    • Título de publicación: European journal of mineralogy
    • Autor: Orejana García, David;Paterson, Bruce A.;Villaseca González, Carlos
    • Resumen: The Permian alkaline lamprophyres from the Spanish Central System (SCS) are highly porphyritic rocks which carry a heterogeneous population of clinopyroxene and kaersutite zoned phernocrysts. Clinopyroxene phenocrysts may show 1) normal zoning (Cpx-I), 2) reverse zoning with Fe-rich green cores (Cpx-II), and 3) reverse zoning with colourless Al-poor,
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    • silica-rich cores (Cpx-III). Kaersutite phenocrysts also show a slight reverse zoning. Major and trace element composition of Cpx-I suggests that their compositional variation is related to a crystal fractionation process from melts similar to the host lamprophyres. The Cpx-II cores represent crystallization from highly evolved melts (low Mg-Cr contents and incompatible element enrichment), genetically related with the SCS alkaline magmatism, and the growth or surrounding Mg-rich inner rims points to a magma mixing process. The major and trace element composition of Cpx-III cores supports derivation from a magma which has fractionated plagioclase. This characteristic, together with their similarities when compared to clinopyroxenes from charnockite xenoliths, suggests that they might be xenocrysts from deep calc-alkaline cumulates. The composition of melts in equilibrium with clinopyroxene and amphibole phenocrysts supports a model in which Cpx-II and Cpx-III cores would have been incorporated into a more primitive lamprophyric magma stagnated at lower crustal levels. The low pressure composition of all phenocryst outer rims indicates that they crystallised directly from the host alkaline magma at their subvolcanic emplacement levels.
    • Palabras clave: Magma mixing, Crystal fractionation, Clinopyroxene, amphibole, Phenocrysts, Alkaline lamprophyres, Geochemistry, REE, Trace elements, Igneous petrology
    • Materia: Geología
    • Identificador OAI: oai:www.ucm.es:12410
    • Tipo: Artículo
    • Editorial: E. Schweizerbart'sche Verlagsbuchhandlung
    • Departamento: Fac. de CC. Geológicas - Depto. de Petrología y Geoquímica
    • ISSN: 0935-1221
    • CDU: 550.4(234.1)







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  • Heterogeneous metasomatism in cumulate xenoliths from the Spanish Central System: implications for percolative fractional crystallization of lamprophyric melts
    OAI: open archives initiativeTipo de documento: artículoColección E-prints Colección: Archivo institucional e-prints complutense
    • Título de publicación: Special publication - Geological Society of London
    • Autor: Orejana García, David;Villaseca González, Carlos
    • Resumen: The alkaline lamprophyres and diabases from the Spanish Central System carry a heterogeneous suite of xenoliths including a group of highly altered ultramafic pyroxenites that contain Cr–Mg-rich high-T hydrous minerals (Ti-phlogopite and pargasitic to kaersutitic amphibole), indicative of modal metasomatism. The trace element mineral compositions
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    • of these xenoliths show three patterns: type A xenoliths, with light rare earth element enriched clinopyroxenes with high field strength element (HFSE) negative anomalies; type B xenoliths, with clinopyroxenes and amphiboles with high incompatible trace element contents (large ion lithophile elements (LILE), HFSE and REE); type C xenoliths, with relatively REE- and HFSE-poor clinopyroxenes and amphiboles. These metasomatic signatures suggest the involvement of three different metasomatic agents: carbonate, silicate and hydrous fluids or melts, respectively. These agents could have been derived from the progressive differentiation of a CO2–H2O-rich highly alkaline magma, genetically related to the Late Permian alkaline magmatism. Because of the original sub-alkaline nature of the pyroxenite xenoliths, theymight have been formed originally as pyroxene-rich cumulates associated with underplated Hercynian calc-alkaline basic magmas. Metasomatism as a result of the infiltration of alkalinemagmaswithin these cumulatesmight explain the relatively high radiogenic Nd composition of the altered ultramafic xenoliths.
    • Palabras clave: Metasomatism; Xenoliths; Spanish Central System
    • Materia: Geología
    • Identificador OAI: oai:www.ucm.es:12371
    • Tipo: Artículo
    • Editorial: Geological Society of London
    • Departamento: Fac. de CC. Geológicas - Depto. de Petrología y Geoquímica
    • ISSN: 0305-8719
    • CDU: 552.4(234.1)







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  • Mineralogy and geochemistry of platinum group elements in the Aguablanca Ni-Cu deposit (SW Spain)
    OAI: open archives initiativeTipo de documento: artículoColección E-prints Colección: Archivo institucional e-prints complutense
    • Título de publicación: Mineralogy and petrology
    • Autor: Gervilla, Fernando;Lunar, R.;Ortega Menor, Lorena;Piña García, Rubén
    • Resumen: The Aguablanca Ni-Cu-(PGE) magmatic sulphide deposit is associated with a magmatic breccia located in the northern part of the Aguablanca gabbro (SW, Iberia). Three types of ores are present: semi-massive, disseminated, and chalcopyrite-rich veined ore. The principal ore minerals are pyrrhotite, pentlandite and chalcopyrite. A relatively abundant platinum-group
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    • mineral (PGM) assemblage is present and includes merenskyite, melonite, michenerite, moncheite and sperrylite. Moreover, concentrations of base and precious metals and micro-PIXE analyses were obtained for the three ore-types. The mineralogy and the mantlenormalised chalcophile element profiles strongly suggest that semi-massive ore represents mss crystallisation, whereas the disseminated ore represents an unfractionated sulphide liquid and the chalcopyrite-rich veined ore a Cu-rich sulphide liquid. Palladium-bearing minerals occur commonly enclosed within sulphides, indicating a magmatic origin rather than hydrothermal. The occurrences and the composition of these minerals suggest that Pd was initially dissolved in the sulphides and subsequently exsolved at low temperatures to form bismutotellurides. Negative Pt and Au anomalies in the mantle-normalised chalcophile element profiles, a lack of Cu-S correlation and textural observations (such as sperrylite losing its euhedral shape when in contact with altered minerals) suggest partial remobilisation of Pt, Au and Cu by postmagmatic hydrothermal fluids after the sulphide crystallisation.
    • Palabras clave: Platinum group elements; Aguablanca (Badajoz); Ni-Cu deposits; Spain
    • Materia: Geología; Geología
    • Identificador OAI: oai:www.ucm.es:12272
    • Tipo: Artículo
    • Editorial: Springer Science Business Media
    • Departamento: Fac. de CC. Geológicas - Depto. de Cristalografía y Mineralogía (Planta 6)
    • ISSN: 0930-0708
    • CDU: 553.48(460.253)
    • Notas: The original publication is available at www.springerlink.com







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