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Browsing Geogaceta -- Nº 20-2, (1996) by Issue Date
Now showing items 1-20 of 67
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The submarine "El Golfo" debris avalanche and the Canary debris flow, West Hierro lsland:The last major slides in the Canary archipelago
(Sociedad Geológica de España, 1996)Swath bathymetry and geophysical data of the island of Hierro show that the western flank of the island is affected, at least, by two major catastrophic slope failures. One of the two, called the El Golfo debris avalanche, ... -
Edad Rb-Sr mediante isocrona de minerales de las tonalitas biotítico-hornbléndicas del Macizo del Montnegre (Cordilleras Costeras Catalanas)
(Sociedad Geológica de España, 1996)A Rb-Sr mineral isochrone has been made from one of the most typical units of the Catalan coastal batholith. The age obtained, 284 ± 7 Ma, is 15 Ma older than the previous whole-rock isochrone available in this area whereas ... -
Historia de la subsidencia y levantamiento en el margen norte de la cuenca intramontañosa de Guadix (Cordillera Bética central)
(Sociedad Geológica de España, 1996)Results of quantitative analysis of subsidence and uplift from three stratigraphic sections located In the northern margin of the Guadix basin are presented. Data obtained allows for correlating main tectonic events recorded ... -
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 ... -
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 ... -
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. ... -
Tempestitas en el Subbético medio (Fm. Milanos, Jurásico superior). Sus características y facies relacionadas
(Sociedad Geológica de España, 1996)We have recognized and analysed tempestites, made up by calcisiltites and calcarenites with chert and hummocky cross-stratification (HCS), in the Milanos Fm (Upper Jurassic) of the Middle Subbetic (Betic Cordillera). The ... -
Perfiles sísmicos en el Margen Insular de Tenerife:Proyecto Teide. Resultados preliminares
(Sociedad Geológica de España, 1996)Continous seismic reflection profiles from north and south slopes of Tenerife, Canary Islands, indicate tha t the slopes o f this island are d o m in ate d by g ra v ita tio n a l structures includin g slumps, catastrophic ... -
Significado geodinàmico de las vergencias al norte en el NE de la Provincia de Sevilla (Zona de Ossa-Morena)
(Sociedad Geológica de España, 1996)The area s tu d ie d is characterized by the occurrence o f structures w h ich associate a N te c to n ic vergence. These are the results of deformational features varying from localized mylonite generation in highly ... -
El modelo de rampa mixta carbonatada y terrígena del aptiense de Castro Urdíales (Cantabria)
(Sociedad Geológica de España, 1996)Detailed geologic mapping and facies analysis of the Lower Aptian succession in the Castro Urdiales area led to the establishment of a mixed depositional system built of three different carbonate ramp units interlayered ... -
Estructuras sedimentarias de deformación originadas por licuefacción en depósitos de tormentas (Mioceno de la Cuenca del Guadalquivir, provincia de Jaén)
(Sociedad Geológica de España, 1996)Soft-sediment deformation structures related with hummocky cross stratification appear in the Upper Miocene calcarenites of the Guadalquivir Basin. They are analysed and after consider their different possible genetic ... -
Relaciones entre la evolución sedimentaria del Grupo de Arén y el Cabalgamiento de Boixols (Campaniense terminalMaastrichtiense del Pirineo Meridional -Central)
(Sociedad Geológica de España, 1996)The Arén Croup was deposited synchronously to the growth of the Boixols thrust. Sedimentation took place in siliciclastic marine and alluvial environments. The growth of a footwall syncline affected the geometry of the ... -
Influencia del substrato sobre la arquitectura y características texturales de los sistemas fluviales: Desarrollo de paleovalles y su relleno
(Sociedad Geológica de España, 1996)Oligocene sedimentation into SW border of Duero Basin (Spain) took place in a tectonically active basin margin. Close examination of these deposits and their relations to paleotopography reveals a strong interaction between ... -
Mass physical, granulometric and mineralogical Characterisation of the glaciomarine sediments of the Bransfield Basin ( NW Antarctic Peninsula)
(Sociedad Geológica de España, 1996)The textural analysis of two gravity cores reveals that the sediments in the Central and Eastern Bransfield subbasins are mainly clayey silts with some coarser levels of sandy silts. While a turbidity origin can be attributed ... -
Evolución del Pirineo central a partir de la comparación entre observaciones y modelos geodinámicos numéricos
(Sociedad Geológica de España, 1996)Numerical geodynamical models guided by the geological evolution of the central Pyrenees show the role of some of the major factors controling the development and the final geometrical style of the collisional orogens. ... -
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 ... -
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 ... -
Estudio del campo de vientos y del transporte eólico de sedimentos en el Istmo de Jandía (Fuerteventura)
(Sociedad Geológica de España, 1996)Jandia Isthmus is characterized by an important sediment flux from the winward coast to the leeward coast. Present study empirically quantifies such movement by means of sediment traps, which allowed us to get different ... -
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 ... -
Distribución batimétrica de las terrazas submarinas en la plataforma continental de Málaga - Gibraltar. Implicaciones eustáticas durante el Cuaternario terminal
(Sociedad Geológica de España, 1996)Three basic remarkable types of submarine forms have been Identified, from high resolution seismic profiling in the Northwestern continental margin of the Alboran Sea: Submarine Terraces, Terraces + Small Prograding Bodies ...
