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Browsing Geogaceta -- Nº 24, (1997) by Issue Date
Now showing items 1-20 of 78
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El Aptiense inferior del Anticlinorio Nor-Vizcaino entre Gernika y Azpeitia (Cuenca Vasco-Cantábrica)
(Sociedad Geológica de España, 1997)The Lower Aptian of the North-Biscay Anticlinorium between Gernika and Azpeitia outcrops in three anticlines: Gernika, Nabarniz (Narea) and Azpeitia. Three representative sections of these outcrops have been dated, correlated ... -
Terrazas rocosas, aluviales y travertínícas del valle alto del río Henares (Guadalajara, España)
(Sociedad Geológica de España, 1997)The fluvial network in the upper Henares which drain into northern half of the Castilian branch of the Iberian Range are made up of the rivers Henares, Dulce and Salado valleys, which are built by dissecting the erosion ... -
Asociaciones de ostrácodos continentales de la Fm. Aguilar (Jurásico superior-Cretácico inferior, Cuenca Vascocantábrica)
(Sociedad Geológica de España, 1997)The fossiliferous content of the Aguilar Fm. (latest Jurassic-earliest Cretaceous, Bascocantabrian Basin, N. Spain) consist mostly of ostracods, clavatoraceans, porocharaceans and gastropods, plus minor remains of fishes, ... -
Un sistema de fallas normales sinsedimentarias en las unidades de facies Urgon de Aliaga (Teruel, Cordillera Ibérica)
(Sociedad Geológica de España, 1997)System of conjugate, E-W to NE-SW striking normal faults is reconstructed from mapping and structural analysis of deformation in the Urgon deposits of the Aliaga region. Those were mainly active during the Aptian age, ... -
Estudio comparado de la evolución e inversión de distintas cuencas mesozoicas de la Placa Ibérica
(Sociedad Geológica de España, 1997)The marginal zones of the Maestrazgo Basin (Las Parras and Galve basins) and the Algarve Basin show a similar evolution during basin formation (mainly Jurassic and Early Cretaceous) and inversion (Oligocene-Early Miocene). ... -
The First Dinosaur Trackway from the Valtos Sandstone Formation (Bathonian, Jurassic) of the Isle of Skye, Scotland, UK
(Sociedad Geológica de España, 1997)A trackway from near the base of the Valtos Sandstone Formation (Bathonian, Jurassic) was discovered on a loose block of biodastic sandstone. Nine distinct track cast, and some less distinct, are preserved in hyporelief ... -
Desarrollo de estructuras agradacionales generadas por oleaje en lagos someros carbonatados. Un ejemplo del Oligoceno superior de la Cuenca del Ebro
(Sociedad Geológica de España, 1997)During the upper Oligocene a carbonated shallow lacustrine system developed in the central sector of the Ebro Basin. The lacustrine system was closely related to alluvial systems spreading from the margins to the centre ... -
Contenido en elementos metálicos de las aguas superficiales del distrito minero de Linares (Jaén)
(Sociedad Geológica de España, 1997)An important mining activity on metallic sulfides ores (dykes in a granitic batholith), now abandoned, was histbrically developed in the Linares area (Jaén, Spain). Samples of leachates from minéral wastes have been studied ... -
Carbon and oxygen isotopic variations applied to the study of carbonate diagenesis in the Landraves Formation (Thanetian, Burgos, Northern Spain)
(Sociedad Geológica de España, 1997)We have studied the dolomitization and calcitization processes that have widely affected the Landraves Formation sediments (Thanetian) at Valdivielso Valley (Burgos). The unit was deposited in a shallow marine environment'with ... -
El origen de las calizas laminadas de los depósitos lacustres someros del sector de La Muela de Zaragoza. Mioceno de la Cuenca del Ebro
(Sociedad Geológica de España, 1997)Marls, laminated limestones, stromatolitic limestones, massive limestones and bioturbated limestones are in Middle Miocene deposits in La Muela región (Ebro Básin). These facies represent the expansion of shallow carbonate ... -
Evidencias petrográficas de interacción entre un magma félsico y un nivel sedimentario rico en radiolarios en la Faja Pirítica Ibérica
Donaire Romero, Teodosio
; Sáez Ramos, Reinaldo; Pascual Martínez, Emilio (Sociedad Geológica de España, 1997)
In the South Portuguese Zone (Hercynian Iberian Massif), carboniferous volcaniclastic and sedimentary sequences accumulated in a submarine environment were penetrated by subvolcanic intrusions during or shortly after ... -
Tectónica de inversion en el sector central del Arco Vasco (Cuenca Vasco-Cantábrica)
(Sociedad Geológica de España, 1997)We report the existence of a thrust system in the central part of the Basque Arc (Basque-Cantabrian basin, Guipúzcoa). From bottom to top, the thrust system is formed by theAia, Pagoeta and Azpeitia allochthonous sheets. ... -
Estratigrafía, petrografía y significado paleogeográfico de las radiolaritas jurásicas de tipo austroalpino de la unidad de las Nieves (Formación Parauta, Rondaides, Cordillera Bética Occidental)
(Sociedad Geológica de España, 1997)The Parauta Radiolarite Formation (Nieves unit, Rondaides) is dated as Middle Bathonian by radiolarians and indirect biostratigraphic criteria. It was deposited in a deep basin, perched and confined in the distal zone of ... -
Estratigrafía y evolución sedimentaria del Oxfordiense superior-Titónico inferior en Riela (Zaragoza)
(Sociedad Geológica de España, 1997)The Upper Jurassic of Rida consists of three depositional sequences. The HST of the lower one (Oxfordian Sequence) corresponds to the marls and marly limestone and sandstone of the lower part of the Sot de Chera Fm. The ... -
Evolución megasecuencial de los materiales oligo-miocenos del sector septentrional de la Cuenca del Ebro (provincia de Huesca)
(Sociedad Geológica de España, 1997)The outcropping continental detrital formations in the northern margin of the Ebro Basin between the Sierras Exteriores Aragonesas and the Sierras Marginales Catalanas have been analyzed. These materials form part of the ... -
Intercrecimientos de filosilicatos en la Cuenca de Cameros y su relación con la génesis de la esquístosidad en la etapa metamórfica de bajo grado
(Sociedad Geológica de España, 1997)The Cameros Basin, a Wealdian Basin of Northern Iberian Range, underwent a very low grade cretaceous metamorphism coeval with a folding related cleavage. Deformation can be observed at different scales in the whole ... -
El granitoide de Manzaneda, marcador del acortamiento NE-SW en el arco hercínico
(Sociedad Geológica de España, 1997)The Manzaneda granite (NW Spain) is located at the southern sector of the Calida Variscan arc. It shows a NW-SE elongated shape, and covers ah area of about 400 Km2, within thè «P/ló de Sapo» anticlinorium. It is a ... -
Estudio petrográfico de la alteración en la arenisca del monasterio de Rueda (Sástago, Zaragoza). Primeros resultados
(Sociedad Geológica de España, 1997)A petrographical study about macroporosity, profiles of deterioration and treatment, has been taken out over seventeen samples from Rueda cloister. These samples have been taken from different placés from the monastery. ... -
Evidencias morfogenéticas cuaternarias en el karst de la Sierra del Endrinal (Grazalema, Cádiz)
Rodríguez Vidal, Joaquín; Álvarez, G.; Cáceres Puro, Luis Miguel; Martínez Aguirre, Arancha; Alcázar, J. M. (Sociedad Geológica de España, 1997)
The geomorphological observations made until now reveal a long morphogenic history for the karst of the Eridrinal: mountains; going back to pre-Quaternary times. The erosion surfaces mapped (Sl, S2 and 53) have å biostatic ... -
Strain analysis using deformed quartz veins
(Sociedad Geológica de España, 1997)A detailed strain analysis of structures developed in anisotropic rocks from the Cap de Creus area is made using deformed quartz veins. Data on stretch of differently oriented veins allow to calculate the best-fit ellipsoids ...
