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Browsing Geogaceta -- Nº 08, (1990) by Title
Now showing items 1-20 of 47
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Algunas aportaciones al conocimiento tecto-sedimentario del carbonífero de «El Bierzo» (León)
(Sociedad Geológica de España, 1990)The reactivation of fractures caused the opening of the Stephanian Basin which generated the angular discordances between diverse sand bodies of the lacustrine fan delta, isolating the different coal beds and changing the ... -
Algunas reflexiones sobre los modelos tectónicos aplicados a la Cordillera Ibérica
(Sociedad Geológica de España, 1990)There are two main types of models for explaining the compressional and extensional tectonics of the Iberian Chain: models of «tectonic phases», involving sequences of different primary stress fields, and models which ... -
Algunos aspectos de la deformación continua de los materiales mesozoicos del borde noroccidental de la Cordillera Ibérica (Rama Aragonesa): esquistosidad y microestructuras asociadas
(Sociedad Geológica de España, 1990)The folding-cleavage relations observed in some mesozoic outcrops from the NW limit of the Iberian Chain (Aragonian Branch) suggest an origin related to the compresive tertiary phases for such anisotropy. In this paper ... -
Análisis estructural de las mineralizaciones de baritina de la Unidad de Herrera (Cordillera Ibérica Oriental)
(Sociedad Geológica de España, 1990)Structural analysis of brittle deformation related to barite veins in Unidad de Herrera (Eastern Iberian Chain) shows the deposit occurred under an extension regime, almost uniaxial, with iberic direction, probably ... -
Aspectos paleoecológicos de la cuenca de los Santos de Maimona: acritarcos y esporas
(Sociedad Geológica de España, 1990)The proposed palaeocological model of the Santos de Maimona basin, based in the palynomorphs content, modifies precedent interpretations. The presence of acritarchs and other sedimentary aspects in the stratigraphic Iower ... -
Cálculo de los parámetros de los procesos de fusión parcial, cristalización fraccionada y mezcla, con el programa TRAZAS
(Sociedad Geológica de España, 1990)The program TRAZAS calculates the compositions of liquids generated by either melting or fractional crystallization, if all the parameters involved in both processes are known. If some of these parameters are unknown, then ... -
Caracterización bioestratigráfica de la Biozona Transversarium (Oxfordiense medio) en el sector oriental de la Cordillera Ibérica
(Sociedad Geológica de España, 1990)In NE Iberian Chain (E. Spain), the Transversarium Zone is developed in sponge limestone facies. All the subzones af this biozone have been characterised by means of ammonites. The basal, Parandieri Subzone, is only ... -
Caracterización de la materia orgánica de la Facies Villaro-Aramayona por pirólisis Rock-Eval
(Sociedad Geológica de España, 1990)lt has been analyzed the organic matter on the Weald and Aptien sediments from the Villaro-Aramayona facies, using rock-eval pyrolysis as organic geochemistry technique. lt has been determined oil potential, the type of ... -
Caracterización de la secuencia Oxfordiense en el sector central de la Cordillera Ibérica
(Sociedad Geológica de España, 1990)In the central Iberian Chain (E. Spain) the regional, tectonoeustatic events seem to have determined the development and distribution of facies. The lowstand deposits correspond to a thin, condensed level of Fe-oolitic ... -
Caracterización mineralógica de los sedimentos actuales del río Nervión (Vizcaya)
(Sociedad Geológica de España, 1990)The modern sediments of the Nervión River have been investigated in order to determine the mineralogical composition of the bulk sample, and the distribution of the clay minerals in the 2-20 pm fraction and the <2 pm fraction -
Comportamiento hidráulico y sedimentario del río Ebro, entre Tortosa y Amposta (Tarragona, España)
(Sociedad Geológica de España, 1990)The segment studied in the Lower Ebro River is 13 km long and it marks the end of fluvial-dominated environments preceeding the deltaic environments (fluvio-deltaic, fluviomarine and river mouth) fully developed down ... -
El Cretácico superior en la terminación occidental de la Zona Axial Pirenaica
(Sociedad Geológica de España, 1990)Four depositional sequences have been recognized in the Upper Cretaceous of the western Axial Zone (Pyrenees). The lower two ones are made up of shelf carbonates, whereas the upper ones represent terrigenous shelf and basin ... -
Datación Radiogénica (U-234/U-238 y Th-230/U-234) de sistemas travertínicos del Alto Tajo (Guadalajara)
(Sociedad Geológica de España, 1990)Data of Th-230/U-234 and U-234/U-238 ratios and geomorphological and sedimentological features of several travertine deposits of High Tajo river valley let us point out the evidence of at least four travertine genesis ... -
Dataciones Rb/Sr en el complejo plutónico Táliga Barcarrota (CPTB) (Badajoz)
(Sociedad Geológica de España, 1990)The Plutonic Complex of Táliga-Barcarrota crops out in the core of the Olivenza Monesterio anticline, where it intrudes the Upper Precambrian and Lower Cambrian metasediments; As this Complex is made of a) the Circular ... -
Datos bioestratigráficos de los materiales silúricos del Sinclinal de Herrera del Duque (Badajoz)
(Sociedad Geológica de España, 1990)The Silurian sequence in the Herrera del Duque syncline (Southern Central Iberian zone) starts with 20 m of black shales (Guadarranquejo Formation) which lay disconformably upon the Hirnantian diamictites (Gualija Formation). ... -
Depósitos de abanicos aluviales distales en la unidad inferior del pérmico del borde noreste del Sistema Central
(Sociedad Geológica de España, 1990)This paper deals with the sedimentological features of the Permian lowermost lithostratigraphic unit in the northeastern edge of the Spanish Central System. Three major sequences are established. They result in a ciclicity ... -
Las diaclasas y diques en el Plutón de Caldas de Reyes (Provincias de La Coruña y Pontevedra. España)
(Sociedad Geológica de España, 1990)This paper deals with the role of the arrangement of joint systems and dykes of the latehercynian Caldas de Reyes granitic pluton. Despite of the role of late and posthercynian deformation phases on the genesis of the joint ... -
Distensión-comprensión en la cuenca de Campo Arañuelo, Implicación cortical
(Sociedad Geológica de España, 1990)Pre-Arcosic detritic sediments (Paleocene-Eocene?) have been affected by normal faults; this distension phase, named Extremeña Phase, is related with Other similar regional observations. During Lower-Upper Miocene a new ... -
El drenaje subterráneo de la Cordillera Ibérica en la depresión del Ebro: aspectos geológicos
(Sociedad Geológica de España, 1990)Six hydrogeologic cross-sections, all of them placed along the contact between the Iberian Chain and the Tertiary Ebro Basin, are presented in this work. These cross-sections avoid us to establish a «geometric model» which ... -
Efecto de arrastre aparente en zonas de cizalla: resultados de un modelo experimental
(Sociedad Geológica de España, 1990)An experiment has been carried out at the ETH (Swiss Institute of Technology at Zürich, Switzerland) with a wax model, using the automatized machine under plane strain/pure shear conditions, developed by Mancktelow (1988). ...
