Thesis Collection
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Browsing Geogaceta -- Nº 20-7, (1996) by Issue Date
Now showing items 21-40 of 69
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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 ... -
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 ... -
La evolución isotópica de los fluidos ligados a los Sistemas Hidrotermales tardi y postvariscos del Sistema Central Español
(Sociedad Geológica de España, 1996)The late to postvariscan hydrothermal activity of the Spanish Central System extends almost from ca. 300 Ma to the present. It consists of several Independent stages that can be grouped in two different hydrothermal regimes. ... -
Metamorfismo y magmatismo del Paleozoico inferior en la zona central de las Sierras Pampeanas (SW de Gondwana)
(Sociedad Geológica de España, 1996)The Sierra de Los Llanos intrusion is a Lower Paleozoic pluton of meta-aluminous granites (with tholeiitic and calc-alkaline features) representative of batholiths of the Sierras Pampeanas, here associated to small bodies ... -
La cubeta mesozoica de las Columbrets: aportaciones al conocimiento de la estructura del surco de Valencia
(Sociedad Geológica de España, 1996)The reflection seismic profiles of the southwest Valencia trough show that the Neogene Valencia trough extensional basin is superim posed over a NE-SW oriented syncline. This syncline, Paleogene in age, is made up by more ... -
Origen de escapolitas asociadas a doleritas triásicas del Norte de la provincia de Cádiz
(Sociedad Geológica de España, 1996)Scapolites are present in some doleritic tectonic blocks C'ophites" )in the External Zones o f the Betic Cordilleras, In Northern of Cadiz province. These scapolites fill veinlets and replace plagioclases from the dolerites ... -
Las cloritas de los cuerpos pegmatíticos del plutón de La Cabrera (Sistema Central Español)
(Sociedad Geológica de España, 1996)The chlorites included within the pegmatitic bodies of the La Cabrera pluton (Spanish Central System) have been studied in order to stablish their characterization, clasification and relationship with other minerals. Two ... -
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. ... -
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 ... -
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 ... -
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 ... -
Estudios mineralógicos y litogeoquímicos de El Berrocal
(Sociedad Geológica de España, 1996)The different materials existing in the El Berrocal pluton are characterized from a mineralogical, chemical and geochemical point of view. The influence of the alteration processes on the migration/ retention of U, Th and ... -
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 de paleoalteraciones y paleosuperficies en el marco del PICG, proyecto 317. España
(Sociedad Geológica de España, 1996)The results obtained in the IGCP project 317, by the Spanish working group, can be separated into two general subjects: 1) paleoweathering profiles developed in the Iberian Hercynian Basement and their relationship with ... -
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 ... -
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 ... -
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 ... -
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 ...
