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Visualizar Geogaceta -- Nº 20-7, (1996) por fecha de publicación
Mostrando ítems 21-40 de 69
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Influencia de la molienda en el grado de acicularidad de la Wollastonita
Fernández Caliani, Juan Carlos
; Galán Huertos, Emilio (Sociedad Geológica de España, 1996)
Wollastonite is a relative newcomer to the industrial minerals market, which economic interest is determined by the acicularity of the crystals. In this work, a linear regression analysis of wollastonite crystal dimensions ... -
Un yacimiento de Au en carbonates del Orógeno Hercínico: el área de Salamón (N León)
(Sociedad Geológica de España, 1996)The Salamon gold prospect constitutes an example o f carbonate-hosted gold deposit formed during the last events of the Hercynian orogeny. It is formed by a complex paragenetic sequence o f Au-As-Sb-Hg-Cu-NI-Co-Pb-Zn-U ... -
Relación entre metamorfismo y mineralización en las rocas básicas y ultrabásicas de Mina Salamanca y los Gateados (Provincia de Mendoza, Argentina)
(Sociedad Geológica de España, 1996)The basic and ultrabasic rocks from Mina Salamanca district and Los Gateados area are metamorphosed in epidote-amphibolite facies, and locally, in greenschist facies conditions. The green chist facies assemblages develop ... -
Visión global del Proyecto Berrocal. Planteamiento y objetivos
(Sociedad Geológica de España, 1996)The El Berrocal Project was preceded by a preliminary study (0 Phase) started in 1989, intended to prepare and ensuring the performance of the actual Project that was divided in two two-year phases. At its very origin the ... -
Procesos que afectan a la movilidad del U y otros elementos traza en entornos graníticos y a baja temperatura. Experiencias del Proyecto Berrocal
(Sociedad Geológica de España, 1996)The main processes affecting the retardation and mobility of U and other trace elements In the El Berrocal environment are presented and discussed. Particular emphasis is put in recent low temperature events that indicate ... -
Tectónica distensiva jurásica en el Subbético Externo oriental (Sureste de España)
(Sociedad Geológica de España, 1996)The stratigraphy and evolution of the subsidence during the Jurassic in an eastern section of the External Subbetic (External Zones of the Betic Cordilleras) have been analized. Backstripping curves are constructed, and ... -
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 ... -
Granates de la serie Grosularia-uvarovita en cromititas prodiformes del yacimiento Mercedita (Cuba)
(Sociedad Geológica de España, 1996)The Mercedita chromite podiform deposit is genetically and spatially related to the Moa-Baracoa ophiolite complex (NW Cuba). The ore bodies are crosscuted by veins, filled up by uvarovite with variable amounts of chromiferous ... -
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 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 ... -
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 ... -
Estudio de inclusiones fluidas en granitos microfisurados. Mineralizaciones de W-Sn del Sistema Central Español
(Sociedad Geológica de España, 1996)The geometry of the ore fluid migration was investigated in the (W-Sn) mineralizated granites of the Spanish Central System. Based on microthermometry, Raman microprobe and textural relationships, six types of fluid ... -
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 ... -
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, J. A.; 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 ... -
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 ... -
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 ... -
Procesos de interacción agua-roca y comportamiento del uranio en el sistema granítico de El Berrocal (España)
(Sociedad Geológica de España, 1996)This work depicts a synthesis of the main water-rock interaction processes controlling the water chemistry in El Berrocal granitic pluton, emphasizing in the uranium geochemistry. An uranium-sulphide dyke controls the ... -
Rasgos estructurales principales de la cuenca cretácica inferior del Maestrazgo (Cordillera Ibérica oriental)
(Sociedad Geológica de España, 1996)The Maestrat basin (up to 6.5 km of Mesozoic sediments) is an intracontinental basin located in the Iberian Range (Iberian Basin), which underwent two significant rift stages during the Late Jurassic and Early Cretaceous. ... -
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 ...
