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Browsing Geogaceta -- Nº 20-7, (1996) by Title
Now showing items 11-30 of 69
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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 ... -
El campo pegmatítico de Lalín y sus mineralizaciones de Sn, Ta y Nb asociadas (Pontevedra, Galicia, España)
(Sociedad Geológica de España, 1996)The aim of this paper is to present the most important mineralogical, textural and pretrological characteristics of the Lalin pegmatite field. We can establish two different types of zoned pegmatites, with Li and without ... -
El límite Paleoceno/Eoceno en España: características y posibilidades
(Sociedad Geológica de España, 1996)The Paleocene / Eocene boundary has been studied for the last seven years by the Spanish working group of ICCP project 308. Many sections have been sampled and studied, concluding that the most suitable sections to define ... -
El magmatismo alcalino jurásico del sector SE de la Cadena Ibérica: composición y estructura
(Sociedad Geológica de España, 1996)Jurassic volcanic rocks are well exposed in the Sierra de Javalambre (Teruel)., This multiepisodic volcanism is mainly volcaniclastic , showing a large variety of fragmentation and emplacement mechanisms, and it is ... -
El metamorfismo de contacto e hidrotermalismo asociados al batolito de la Maladeta: Geoquímica isotópica de C y O en carbonates
(Sociedad Geológica de España, 1996)The isotopic composition of carbonates related to the skarn and contact metamorphic aureole of La Maladeta batholith show a broad range of variation. The whole set of obtained data can be modeled by means of an isotopic ... -
El origen de los fluidos hidrotermales en el Skarn férrico de Colmenar-Santa Bárbara (Zona de Ossa Morena)
(Sociedad Geológica de España, 1996)Oxygen and carbon isotopes o f the hydrothermal minerals in the Colmenar-Santa Bárbara skarn suggest that fluids of the main hydrothermal stage (grandite/clinopyroxene and actinolite+magnetite) are of likely magmatic origin. ... -
El Programa Internacional de Correlación Geológica (PICG): Perspectiva internacional y española
(Sociedad Geológica de España, 1996)The outcome of a lengthy process of consultations and preparatory work culminated,in 1971, in the Intergovernmental Conference of Experts for preparing an International Geological Correlation Programme. This Programme ... -
Ensayos de trazadores en medios fracturados de baja permeabilidad Ejemplos del Proyecto El Berrocal
(Sociedad Geológica de España, 1996)Tracer tests are of main importance to understand the behaviour of solutes at hydrological systems. In low permeability fractured media, performance of such tests becomes difficult due to the low flowrates achivable, to ... -
Estructura profunda de la cuenca de Cameros (Cordillera Ibérica) a partir de datos gravimétricos
(Sociedad Geológica de España, 1996)The Cameros basin (Iberian Chain) developed under a very subsident extensional regime during the latest Jurassic-early Cretaceous. Its fill constitutes a magasequence o f more than 5000 m of vertical thickness. That would ... -
Estudio comparativo de las morfologías de crecimiento teórica y experimental de cristales de malaquita
(Sociedad Geológica de España, 1996)The growth of malachite has been studied in a system involving the counter diffusion of Cu2+ and C 0 3” through a silica gel column . The growth morphologies obtained are interpreted on the basis of the supersaturation ... -
Estudio comparativo de los minerales de la fracción pesada en los sedimentos de las terrazas del Río Guadalete y fondos de la Bahía de Cádiz
(Sociedad Geológica de España, 1996)Heavy minerals of sediments from bottom of the Bay of Cádiz and terraces of the Guadalete river have been studied, for establish the genetic relationships and source areas. The use of surface feature analysis using SEM ...
