Geogaceta -- Nº 04, (1988)
Permanent URI for this collectionhttps://hdl.handle.net/10272/18210
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Item type: Item , Sobre la estructura del Antiforme de El Cardoso y el Sinforme de Majaelrayo y su relación con la Falla de Berzosa(Sociedad Geológica de España, 1988) González Lodeiro, Francisco; Martínez Catalán, José R.; Macaya, J.; Álvarez, F.The El Cardoso Antiform and the Majaelrayo Synform are structures which were generated during the third hercynian deformation phase (F) and are cross-cut by the Berzosa Fault, a normal accident with a dextral wrench component. The ductile shear zone that outcrops in the core the El Cardoso Antiform can be related to that which exists west of the Berzosa Fault and also to that which affects the overturned limb of the Hiendelaencina AnticlineItem type: Item , Relaciones químico-estructurales entre sulfosales de Bi, Sb, Ag en las mineralizaciones del Sistema Central (sectores Central y Oriental)(Sociedad Geológica de España, 1988) Martínez Frías, J.Methodological aspects and results from the compositional-structural relationships of sulphosalts are summarized. These sulphosalts correspond to S-Bi-Ag and S-Sb-Ag systems presenting pseudoisometric characteristics. Attending to the paragenetic and crystallogenetic trends, they seem to be the result of an epithermal late metallogenic episode. Thermal sequences into these systems have not been detectedItem type: Item , Lacustrine diatomite deposits in the Madrid Basin (Central Spain)(Sociedad Geológica de España, 1988) Calvo, J. Pedro; Pozo Rodríguez, Manuel; Servant ViIdary, S.La parte superior de la Unidad Intermedia del Mioceno en el sector occidental de la Cuenca de Madrid contiene varios niveles diatomíticos, que consisten tanto en diatomitas casi puras como en calizas y margas con contenido variable en diatomeas. Estos niveles fueron depositados en un ambiente lacustre somero caracterizado por condiciones de salinidad moderada y alcalinidad variable, tal como atestiguan la mineralogía de los depósitos y las asociaciones de diatomeas reconocidas. Dentro de éstas se ha distinguido dos asociaciones características, una con predominio de Fragilaria bituminosa y otra constituida por varias especies de Cymbella. Ambas asociaciones se sustituyen entre sí en la vertical de las secciones, indicando fluctuaciones en las condiciones de depósitoItem type: Item , La asociación magmática del Batolito de los Pedroches en la Zona de Pozoblanco (Córdoba-España)(Sociedad Geológica de España, 1988) Sánchez Pérez, J. M.; Carracedo Sánchez, Manuel; Larrea Bilbao, F. J.Two major intrusion events have been recognized in the area studied. The first one is represented by the granodioritic rocks of Los Pedroches Batholith while the second one corresponds to the intrusion of the granites of El Guijo Pluton. The two magmatic cycles show distinctive features, including differentiated dyke complexes, which are well exposed throughout the studied zoneItem type: Item , Isótopos estables de carbono y oxígeno de los rellenos de calcita (falsa ágata) y su interés paleoambiental(Sociedad Geológica de España, 1988) Jiménez de Cisneros, C.; Linares, J.; Reyes, E.; Vera, J. A.The isotopic composition of modern calcite fills (onyx marble) in fractures and related caves is studied. Carbon and oxygen stable isotopes in this material are similar to the vadose speleothems (stalactites and stalagmites) in modern caves and to calcareous concretions in modern soils. This study can contribute to the recognition of analogous deposits in paleokarstsItem type: Item , Identificación de unidades litoestratigráficas del Cretácico en diagrafías(Sociedad Geológica de España, 1988) Aracil Ávila, E.An approach to the establishment of different early Upper Cretaceous Lithostratigraphic Units caracteristics in the diagraphies of a log drilled in the Iberian RangesItem type: Item , Estructura y evolución del borde sur-occidental de la Fosa de Calatayud-Daroca(Sociedad Geológica de España, 1988) Colomer i Busquets, M.; Santanach, P.The Calatayud-Daroca Basin is located in the Iberian Range. The SW margin of this Basin is the Jiloca fault. The evolution of the Basin during the Miocene, was conditioned by dextral slip on this fault. During the Pliocene the Jiloca fault had a normal slip, resulting in the Jiloca Basin formationItem type: Item , Estructuras distensivas y procesos metamórficos asociados en la Zona de Cizalla de Berzosa(Sociedad Geológica de España, 1988) González Casado, J. M.; Casquet Martín, CésarEvidence of a late-metamorphic extensional shear activity has been found along the central part of the Berzosa Shear Zone, as evidenced by «S-C» structures. This event could be correlated with a period of regional extension, found elsewhere in the Spanish Central SystemItem type: Item , El nivel con carbonatos del «Alcudiense superior» en el Area de Cabezarrubias-Hinojosas (Valle de Alcudia, Ciudad Real)(Sociedad Geológica de España, 1988) Peláez Pruneda, J. R.; García Hidalgo, J. F.; Moreno Eiris, E.; Herranz Araújo, P.The levels which contain carbonates are the essential ones both for litostratigraphic correlation and facies analysis in the Upper Proterozoic series of the Central Iberian zone. In this work, several carbonatic outcrops in the Alcudia valley are studied, some of them for the first time. All the outcrops are related forming the only one level with carbonates in that area (unidentified until now); its stratigraphic position in the «Upper Alcudian» is also advancedItem type: Item , El límite meridional de la transgresión cenomaniense superior en la Cordillera Ibérica (Murcia, Albacete y Valencia)(Sociedad Geológica de España, 1988) Giménez, R.; Vilas, LorenzoDuring Late Cenomanian, an Atlantic transgression occurs as a result of the Iberian Plate tilting. Its southern limit is recognized in the Murcia-Albacete-Valencia area, with continental sediments, which are dividing the Iberian and Betic basins during that ageItem type: Item , Deformación de terrazas fluviales recientes en la franja costera cantábrica(Sociedad Geológica de España, 1988) Cendrero, A.; Díaz de Terán, J. R.; Moñino, M.Evidence of faulting with displacements of several meters in a fluvial terrace 20 m above the present river level has been found in Polanco, near Santander. The site is located nead a diapir of Triassic clays and salts. This shows that there has been deformation in the area during late Quaternary times, perhaps only in relation to diapir emplacement