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Browsing Geogaceta -- Nº 20-2, (1996) by Title
Now showing items 1-20 of 67
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Aminocronoestratigrafía e historia térmica de los depósitos cuaternarios de las Islas Canarias (España). Resultados preliminares de la Isla de Lanzarote
(Sociedad Geológica de España, 1996)This paper deals on the first results of an Amino acid racemization dating campaing carried out on coastal and archaeological mollusca deposits of Lanzarote and Gran Canaria islands (Canary Islands, Spain). First results ... -
Análisis numérico de la distribución de trazas de bioturbación. Un ejemplo de la Unidad de la Mola (Zonas Externas de las Cordilleras Béticas, provincia de Alicante)
(Sociedad Geológica de España, 1996)The application of numerical methods to the study of the distribution of trace fossil in hardground surfaces appears scarcely in the previous bibliography, mainly because these traces usually have a random distribution not ... -
Application of specific extraction chromatographic methods to the Rb-Sr, Sm-Nd isotope study of geological samples: The Hombreiro-Santa Eulalia Granite (Lugo, NW Spain)
(Sociedad Geológica de España, 1996)The analytical application to geological samples of three new chromatographic resins, TRU-Spec ®, Sr-Spec ® and LN-Spec ®) has been investigated. Seven samples of the Hombreiro massif (Lugo, NW Spain) have been studied, ... -
Arrecifes de coral hermatipicos (Cladocora caespitosa) en el relleno holoceno de la zona de Es Grau (Menorca, Mediterräneo Occidental)
(Sociedad Geológica de España, 1996)The sedimentologic study of six cores made in the beach-barrier and lagoon of the Albufera des Crau (northeastern Menorca), reveals the presence of the upper Pleistocene - Holocene sequence that starts with a terrigenous ... -
Batimetría Multihaz del margen insular de Tenerife (Islas-Canarias): Proyecto TEIDE-95
(Sociedad Geológica de España, 1996)The oceanographic cruise Teide-95 was carried out by the Instituto Español de Oceanografía. The main objetive was the analysis of the ocean floor around Tenerife island. In order to determinate the bathymetry of this area, ... -
Boratos cálcico-sódicos de ambientes evaporíticos lacustres: aspectos sedimentológicos y diagenéticos generales
(Sociedad Geológica de España, 1996)Sodium-calcium borate deposits of Neogene age and evaporitic lacustrine origin are in many aspects (lithofacies, facies belts, deposicional cycles, early and late diagenetic processes) similar to other chemical formations. ... -
Cambios eustáticos y arquitectura estratigráfica de unidades costeras
(Sociedad Geológica de España, 1996)Eustatic movements generate intricate patterns of coastal units. The resulting stratigraphyc architecture depends on eustasy, sediment supply and local tectonics. Tri-dimensional relations due to sea-level changes are ... -
Canales arenosos de la Formación Nájera: Características Deposicionales y factores de control
(Sociedad Geológica de España, 1996)The studied sedimentological section is located in continental tertiary sediments of the western part of the Ebro Basin, and have been interpreted as being generated by braided streams in a general depositional subenvironment ... -
Canales de alta y baja sinuosidad en la "Facies Tierra de Campos" (Sector central de la Cuenca del Duero)
(Sociedad Geológica de España, 1996)High and low-sinuosity channels are recognized in the silicidastic fluviatile sediments of the "Facies Tierra de Campos" in the central sector of Duero Basin. From paleodrainage directions and their lateral relations, we ... -
Características petrológicas y edad K-Ar de las sienitas-nefelínicas del Morro del Recogedero (Fuerteventura,Islas Canarias)
(Sociedad Geológica de España, 1996)The nepheline syenites from the Morro del Recogedero outcrop represent the fractionated end member of the alkaline gabbro-ijolite associated rocks. Two K-Ar ages for the nepheline syenite rocks have been obtained. One of ... -
Caracterización sedimentológica de los sistemas fluviolacustres y tobáceos del Mioceno Superior-Plioceno de la Cuenca de Calatayud (Zaragoza)
(Sociedad Geológica de España, 1996)A complex fluviolacustrine calcareous system with associated autochtonous tufa deposits is recognized in the Upper Miocene-Pliocene of the Neogene Calatayud Basin. A detailed sedimentological analysis of the calcareous ... -
Cartografía sedimentaria de la bahía de El Confital (Gran Canaria). Consideraciones sobre el transporte de sedimentos hacia la playa de Las Canteras
(Sociedad Geológica de España, 1996)A serie of maps based on sediment size properties has been developed from an extensive sampling and sieve analysis of the bottom sediments presents al El Confital bay (Gran Canaria). Six homogeneous areas have been ... -
Correlation of hercynian units of the Iberian massif and southeastern France
(Sociedad Geológica de España, 1996)The Olio de sapo anliform in the northwest Iberian Massif is made up of superposed allochthonous units of Paleozoic metasediments and Ordovician orthogneisses, similar to gneissic domes in the eastern Pyrenees and in the ... -
Corte geológico N-S en el Pirineo oriental: emplazamiento en una secuencia de bloque superior ("fuera de secuencia") de las láminas cabalgantes que forman el manto inferior del Pedraforca
(Sociedad Geológica de España, 1996)We present a N-S geological cross-section in the eastern Pyrenees, starting in the southern margin of the Neogene Cerdanya basin, and ending in the Upper Eocene to Oligocene Ebro foreland basin. The lower Pedraforca thrust ... -
Datación Ar39 / Ar40 de mineralizaciones de mercurio de Sinclinal de Almadén
(Sociedad Geológica de España, 1996)Mercury mineralizations in the Almaden district can be grouped in two main categories: i) strata-bound mineralizations hosted in Criadero quartzite (Lower Silurian) and ii) veins and stockworks in Silurian and Devonian ... -
Dataciones K-Ar de los granitoides del área La Alberca-Béjar (Sistema Central Español)
(Sociedad Geológica de España, 1996)Late-kynematic granitoids of the Central Iberian Zone (Iberian Variscan Massif) outecrop in the La Alberca-Bejar region (Salamanca, Spain). The granitoids postdate the regional second variscan deformation phase. The country ... -
Depósitos coralinos litificados en el Estrecho de Gibraltar
(Sociedad Geológica de España, 1996)With the results obtained in the various marine campaigns carried out in the Strait of Gibraltar Sill, an area covered with ahermatipic coral mounds and hardgrounds very lithified has been encountered in its central and ... -
Desarrollo de calcretas en cavidades cársticas y/o de raíces: Las calcretas Cuaternarias de la Isla Gran Cayman
(Sociedad Geológica de España, 1996)The rugged karst terrain that is developed on the dolostones of the Miocene Cayman Formation on Grand Cayman includes numerous large cavities that formed through the activity of tree roots. The surfaces of those cavities ... -
Determinación de direcciones de corrientes mediante el análisis de "formas de fondo" en la Bahía de Cádiz
(Sociedad Geológica de España, 1996)Different fields of “bed forms" in external areas of Bay of Cadiz has been identified, with aim of establish a distribution pattern of bottom currents, on the base of analysis of side scan sonar recordings and echosounder ... -
Dinámica de los canales submarinos del talud y el glacis continentales del Ebro (Mediterráneo-noroccidental) a partir de imágenes acústicas de alta resolución
(Sociedad Geológica de España, 1996)A comprehensive data set of the seafloor relief and superficial sedimentary cover on the Ebro progradational continental slope, NW Mediterranean Sea, reveals that its Late Quaternary building results from complex ...
