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Browsing Geogaceta -- Nº 20-7, (1996) by Title
Now showing items 1-20 of 69
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834S de los sulfuros silúricos tipo "sedex" de Latedo-Sejas de Aliste (Zamora, España)
(Sociedad Geológica de España, 1996)The sulphides of Latedo-Sejas are mainly constituted of pyrite-pyrrhotite and, on the basis of their textural and structural characteristics, two mineralógicaI stages have been differentiated: syn-diagenetic and/or metamorphic ... -
Actividades del Grupo de Trabajo de Geología y Metalogenia de Depósitos Hidrotermales Submarinos (Proyecto P.I.C.G. ne 318)
(Sociedad Geológica de España, 1996)The Spanish working group on “Geology and Metallogeny of Seafloor Hydrothermal Deposits"(IGCP project 318) has concentrated research in four areas: 1) Las Herrerías deposit, Vera-Garrucha basin (SE iberia): an interesting ... -
Albititas metasomáticas y venas de cuarzo en los leucogranitos de Burguillos del Cerro (España). Modelo de evolución hidrotermal basado en el estudio de inclusiones fluidas
(Sociedad Geológica de España, 1996)Slightly peraluminous to metaluminous leucogranites are common as dyke swarms in the Burguillos del Cerro Plutonic Complex. They show superimposed hydrothermal alterations consisting of quartzrich albitites and Au-bearing ... -
Análisis de los procesos de formación de minerales de la unidad de arcosas de la cuenca del tajo
(Sociedad Geológica de España, 1996)A mineralogic study of the Tajo Basin's Arcoses Unit has been realized from borehole's data. The mineralogy of these sediments corresponds mainly to in herited phases resulting from alteration of granite. Biotite and ... -
Aplicación del modelo paramétrico de vulnerabilidad Drastic en el tramo terminal del río Torderá
(Sociedad Geológica de España, 1996)The parametric model Drastic (acronym of Deep water; Recharge, net; Aquifer media; Soil media; Topography; Impact of vadose zone; Conductivity, hydraulic) is applied to the terminal stretch of Tordera River (in the Catalan ... -
Aplicaciones en la producción de materiales vitrocerámicos de residuos minerales de canteras y serrerías de granito
(Sociedad Geológica de España, 1996)Since time the different mineral phases which constitute the granite rocks have been proposed and used as raw material for the manufacturing of ceramics and glasses. More recently, due to the environmental and storage ... -
Aspectos geológicos: Litología y estructura a escala local y de emplazamiento
(Sociedad Geológica de España, 1996)The current research carried out in the El Berrocal Test Site belongs to the Project "Characterization and validation of the radionuclide migration processes under real conditions in a fracture granitic environment ", in ... -
Aspectos petrológicos , geoquímicos y metalogénicos del magmatismo intraplaca en distintos contextos y edades geológicas
(Sociedad Geológica de España, 1996)Different ocurrences of basic-ultrabasic rocks ranging in age from Precambrian to Mesozoic reveal that intraplate magmatism is a suitable target for exploration of Ni-Cu-PGE ores (and locally, Hg ores'). Long travels o f ... -
Aspectos químicos de la magnetita y clorita de las "ironstones" ordovicicas de Zamora (España)
(Sociedad Geológica de España, 1996)The chemical characteristics of the magnetites and the chlorites from Ordovician ironstones of Zamora are described in this paper. The unusually Hig contents of Ti, V, Cr. Ba and Ni magnetite indicates, probably, the ... -
Biozonación del Paleógeno Inferior basada en macroforaminíferos
(Sociedad Geológica de España, 1996)An integrated biozonation of the Early Paleogene based on shallow benthic foraminifera is presented. The use of index fossil names for designating biozones in a zonation integrating many parallel index fossil groups ... -
Cambios ambientales cretácicos en Asia oriental y meridional: El paso Cenomaniense-Turoniense en el Tibet meridional
(Sociedad Geológica de España, 1996)Fossil assemblages consist on foraminifera and rare ostracodes; all samples have been quantitativelystudied. Planktonic foraminifera allow us to characterise the Rotalipora cushmani Whiteinella archaeocretacea and ... -
Cambios en la dinámica litoral y nivel del mar durante el Holoceno en el Sur de Iberia y Canarias Orientales
Zazo, C.; Dabrio, Cristino José; Goy, José L.; Bardají, Teresa; Ghaleb, B.; Lario, J.; Hoyos, M.; Hillaire Marcel, Cl.; Sierro, Francisco Javier; Flores, José Abel; Silva, P. G.; Borja Barrera, Francisco
(Sociedad Geológica de España, 1996)
The interaction between global factors C'global" glacio-eustatic sea-level rise) and regional factors (tectonic trend, oceanographic factor) is analyzed in different areas of the Iberian and Canary Island littoral. Sea-level ... -
Cd2+ en calcita: Cristalización de la solución sólida (Cd,Ca)C03
(Sociedad Geológica de España, 1996)The complete series of the otavite-calcite solid has been synthesized by counter diffusion of CdCI2+CaCI2 and CaC03 through a column of silica hydrogel. In this system there is a strong preferential partitioning of Cd in ... -
Ciclicidad de alta frecuencia en la megasecuencia sinrift titónico-berriasiense. Cuenca Ibérica oriental
(Sociedad Geológica de España, 1996)In the Iberian basin, the Tithonian-Berriasian supersequence (ZB-1 2 nd order supercycle) was deposited in a subsident regime during the moderate to intense rifting stages of the Jurassic phase. The repetitive character ... -
Ciclicidad de alta frecuencia en la megasecuencia sinrift titónicoberriasiense. Cuenca Ibérica oriental
(Sociedad Geológica de España, 1996)In the Iberian basin, the Tithonian-Berriasian supersequence (ZB-1 2 nd order supercycle) was deposited in a subsident regime during the moderate to intense rifting stages of the Jurassic phase. The repetitive character o ... -
Contribución de la mineralogía y geoquímica de arcillas al análisis de procedencia en los flyschs del Campo de Gibraltar
(Sociedad Geológica de España, 1996)Clay mineralogy Is controlled in the Campo de Gibraltar flyschs by some paleoenvironmental and dlagenetic factors, which appear differently reflected in the several units and lithologies. In fine-grained beds, clay minerals ... -
Descripción de la macla de la frondelita-rockbridgeita asociada a las pegmatitas del Macizo de L'Arize, Pirineos (Ariege)
(Sociedad Geológica de España, 1996)A cruciform intergrowth in a phosphate of the frondelite-rockbrid geite series associated with beryl-columbite pegmatites is studied on the basis of geometric considerations. The crystallographical calculations prove, for ... -
Discusión sobre la estabilidad de la ferroactinolita: Experimentación vs. estimación
(Sociedad Geológica de España, 1996)Ferroactinolite is an important phase belonging to the Ca-Fe-Si-O-H system. Since late sixties, only one experimental work constraining its stability within the P-T-f02 volume is available. From this work, many authors ... -
Edad devónica (Struniense) de las mineralizaciones de Aznalcóllar (Faja Piritica Ibérica) en base a palinología
Pereira, Z.; Sáez Ramos, Reinaldo; Pons, J. M.; Oliveira, J. T.; Moreno Garrido, María Carmen (Sociedad Geológica de España, 1996)
Black shales associated to productive horizon In the Aznalcollar mine have provided mlospore assemblages from the Uppermost Devonian (Strunian, LN Miospore Blozone of Western Europe). StratEgraphic location of black shales ... -
El campo pegmagmático de Forcarei Norte y las míneralizaciones de fosfatos asociadas (Galicia, España)
(Sociedad Geológica de España, 1996)The aim of this paper is to present the most important mineralogical, textural and petrological characteristics of the Forcarei Norte pegmatite field. On the basis of on their internal structure, mineralogical association ...
