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Browsing Geogaceta -- Nº 20-7, (1996) by Issue Date
Now showing items 21-40 of 69
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Pirofanita y Braunita titànica en las rocas con Mn del Sector Central de Ossa-Morena
(Sociedad Geológica de España, 1996)In the Oliva de la Frontera area (Ossa-Morena Central Belt, Iberian Massif, SW Spain) titanian braunite occurs in manganiferous metashales and manganiferous metatuffs while pyrophanite is restricted to pyroxmangite metatuffs. ... -
Las mineralizaciones de U de la Carretona y Casa del Gallo En el granito de Albala (Câceres)
(Sociedad Geológica de España, 1996)The U mineralizations that are estudied in this paper are hosted in Albalagranite.They are controled by late Hercinian vertical or subvertical faults, with an aproximate orientation of N30°E. The mineral association in ... -
Minerales de tierras raras en las carbonatitas del Complejo Basal de Fuerteventura (Islas Canarias)
(Sociedad Geológica de España, 1996)The Fuerteventura carbonatites appear in the Complejo Basal as veins, breccias and shear bands in the coastline between Puerto de la Pena and Cueva de Lobos, and in the Esquinzo ravine zone. These carbonatites are formed ... -
Peloides de glauconita y apatito en sedimentos carbonatados mesozoicos del sector oriental de la Zona Subbética (provincia de Alicante)
(Sociedad Geológica de España, 1996)Glauconite and apatite peloids occur in jurassic and cretaceous bioclast-bearing carbonate rocks from the Algayat-Crevillente Unit (Subbetic Zone). The size and the morphology of peloids are controlled by the bioclasts. ... -
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 ... -
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 ... -
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 ... -
Génesis de las mineralizaciones de Ge asociadas a esfaleritas portadoras de fluidos "incompatibles" del Cerro del Toro (Alpujárride, SE de España)
(Sociedad Geológica de España, 1996)The problem addressed in this article is a te n ta tiv e explanation o f the coexistence of partially miscible "ncompatible" fluids in different primary inclusions of the same crystal (or group of crystals). It is based ... -
Geoquímica de los fluidos asociados a estructuras filonianas mesozoicas del anticlinal de Talayuelas (Cordillera Ibérica, Cuenca)
(Sociedad Geológica de España, 1996)In the Talayuelas anticline (Cuenca province, Iberian Ranges) many quartz-siderite and barite ± quartz veins associated to Mesozoic faulting are found. They reflect an intense hydrothermal activity dominated by upwelling ... -
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 ... -
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 ... -
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 ... -
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 preliminar sobre la tectónica sinsedimentaria del Cretácico inferior en el borde septentrional de la Cubeta de Aliaga (Cordillera Ibérica)
(Sociedad Geológica de España, 1996)The Aliaga sub-basin was developed during the Early Cretaceous in an extensional context. Structures near the northern border of this sub-basin (normal faults, syntectonic unconformities and facies and thickness changes ... -
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 ... -
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 ... -
Geoquímica de los isótopos de azufre, carbono, oxígeno y plomo de Las mineralizaciones del paleozoico del Macizo de la Demanda(Burgos-La Rioja, España)
(Sociedad Geológica de España, 1996)Several Pb-Cu-Zn orebodies of different size and origin occur in Paleozoic materials from the D em andam as8if d /at has been m a in ly deformed by the Hercynian orogeny. Most of the here studied deposits arevein type, ... -
Formación de grafito a partir de fluidos: La mineralización de Huelma (Jaén)
(Sociedad Geológica de España, 1996)The volcanic-hosted graphite mineralization of Huelma Qaén) has been studied in order to stablish the mineralogical characteristics and mechanisms of formation. The graphite is highly ordered (as revealed by XRD and Raman ... -
Extensión mesozoica e inversión compresiva terciaria en la Cadena Ibérica: aportaciones a partir del análisis de un perfil gravimétrico
(Sociedad Geológica de España, 1996)The eastern part of Iberia underwent extension during the Mesozoic and, as a result, intraplate basins were formed. These basins were inverted during the Tertiary giving rise to the Iberian Chain thrust belt. The analysis ... -
Fluidos asociados a filones de cuarzo en la Sierra de Guadarrama. Sistema Central Español
(Sociedad Geológica de España, 1996)Fluids together with alteration were studied in representative hydrothermal barren quartz veins from central part o f Sierra de Guadarrama (Spain). Three types o f fluids have been distinguished: (i) an early fluid stage ...
