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Browsing Geogaceta -- Nº 09, (1990) by Title
Now showing items 1-20 of 36
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Aplicación del método Rf/ø al análisis de la deformación finita de los materiales wealdenses de Agreda (Soria)
(Sociedad Geológica de España, 1990)The presence of clorithic nodules inside low grade metamorphic rocks (Purbeck-Weald facies), to the NE of Agreda (Soria), has allowed to characterize, by means of the Rf/Ø technique, an oblate strain ellipsoid with k=0.70. ... -
Biostratigrafía de los sedimentos continentales del sector septentrional de la cuenca de Guadix, Cordilleras Béticas
(Sociedad Geológica de España, 1990)Two new microvertebrates sites, in the north edge of Guadix basin, permit new predictions about its chronostratigraphy. These sites named Toyo and Yeguas, are of upper Villafranchian and Ruscinian age, respectively -
La Caliza de Peña Redonda (Westfaliense A-B): Evolución tecto-sedimentaria (Cuenca Carbonífera Central asturiana)
(Sociedad Geológica de España, 1990)The occurrence of destructive carbonatic facies at the top of a tectonically controlled megasequence and his probable widespread distribution may be an indicator of an extensive emersion during Westfalian A-B boundary, and ... -
Caracterización de la materia carbonosa grafitizada en el Silúrico inferior del sinclinal de Serrazín, Sistema Central, y su aplicación a la determinación del metamorfismo de bajo grado del área
(Sociedad Geológica de España, 1990)The lower part of the Silurian Serrazin Slates contain an exceptional accumulation of carbonaceous matter in the Serrazín Syncline (Segovia). Low grade Hercynian metamorphism had it transformed into graphite and/or meta ... -
Coronas de flogopita-pargasita en torno a ilmenita en los metagabros de La Bastida (Complejo Plutono-Migmatítico de Toledo)
(Sociedad Geológica de España, 1990)In the coronitic gabbros of La Bastida (Toledo) several metamorphic corona textures of phlogopite and pargasitic amphibole around ilmenite are developed. The genesis of these coronas is directly linked with the widespread ... -
Edificios volcánicos en la Serie I de Fuerteventura: Rasgos generales del edificio central
(Sociedad Geológica de España, 1990)The Old Basaltic Series in Fuerteventura is formed by three main edifices: Northern, Central and Southern (or Jandía) Edifices. The Central Edifice, a shield volcano, extends from El Jable towards Valles Ortega area forming ... -
Estratigrafía del Plioceno de la costa de Cádiz entre Chiclana y Conil
(Sociedad Geológica de España, 1990)The Pliocene sequence of the Cadiz coast between Chiclana and Conil is described. Three sedimentary units, separated by unconformities, can be distinguished. The two lower units are Lower Pliocene in age, according to ... -
Estructuración de los Mantos Alpujárrides al W de Málaga (Béticas, Andalucía)
(Sociedad Geológica de España, 1990)The position and kinematics of shear zones, which developed under different P-T conditions, lead to redefine the Western Alpujarride nappes: Los Reales nappe group (Jubrique and Bermeja nappes, plus the Benarrabá imbrications) ... -
Estudio cinemático de las fallas alpinas que delimitan la fosa tectónica del Lozoya (Sistema Central)
(Sociedad Geológica de España, 1990)In this work we study the alpine fracturation affecting both the Hercynian basement and the Mesozoic/Cenozoic cover, in the Lozoya tectonic trough (Spanish Central System). From the study of the fault rocks and their ... -
Estudio preliminar de la fracturación a escala microestructural en las sierras marginales aragonesas
(Sociedad Geológica de España, 1990)Brittle microstructures in the «Sierras marginales aragonesas» have been analysed by means of the Right Dihedra, y-R diagrams and Etchecopar's methods. The existence of several compression directions can be interpreted as ... -
Estudio previo de las «costras negras» desarrolladas sobre rocas graníticas en la catedral de Toledo
(Sociedad Geológica de España, 1990)Black crusts are typical chemical weathering features of different building materials. In this paper we present the preliminary results obtained through the study of the black crusts developed on some of the building ... -
Evolución durante el Pérmico inferior de las fallas de la región de Pálmaces de Jadraque-Angón (borde SE del Sistema Central español)
(Sociedad Geológica de España, 1990)The Permian basins in the easternmost part of the Spanish Central System have been ascribed to the tectonic activity that took place during the late Hercynian. The Pálmaces half-graben is mainly due to a complex interaction ... -
Las facies de cursos entrelazados en el Pleistoceno de Isla Cristina (Huelva)
Romero Segura, Mª J.; Pendón Martín, José Gabriel
(Sociedad Geológica de España, 1990)
Various facies sequences generated in a fluvial regime of braided type are identified in a series attributed to the Pleistocene from Southwestern Huelva (Southwestern Spain). Channel and bar facies are mainly represented. ... -
Fallas normales de bajo ángulo a gran escala en las Béticas occidentales
(Sociedad Geológica de España, 1990)Low angle normal faults (LANF) related with extensional detachments are mapped in the Western Betics. They developed during the Middle and Late Miocene on continental crust which was previously thickened by fold- and ... -
Geología y fauna de los yacimientos de Colorado 1 , Colorado 2, Aljibe 2 y Aljibe 3. (Cuenca de Guadix-Baza, Cordilleras Béticas)
(Sociedad Geológica de España, 1990)For new micromammals sites from the Guadix-Baza Basin: Colorado 1, Colorado 2, Aljibe 2 and Aljibe 3, are studied. The sites are placed in the Baza Formation (lacustrine marls and claystones), near to the zone of the changes ... -
Geotermometría de las anfibolitas de Acebuches en el sector de Almonaster la Real (Huelva)
Castro Dorado, Antonio; Rosa Díaz, Jesús de la (Sociedad Geológica de España, 1990)
The amphibole-plagioclase geothermometer has been applied to three representative samples of the Acebuches amphibolites (Aracena massif). The results imply the existence of high temperature (900-750ºC) ductile shear affecting ... -
Una importante discontinuidad estratigráfica del Paleoceno de Navarra y del País Vasco: caracterización y significado
(Sociedad Geológica de España, 1990)An important stratigraphic break has been recognized in the Paleocene of Navarra and the Basque Country, which is recorded with different features, both in platform and basinal settings. lt has been correlated through ... -
Los índices internacionales de evaluación. Su aplicación a la investigación geológica española
(Sociedad Geológica de España, 1990) -
Influencia del diapiro de Zarautz sobre los procesos de resedimentación paleocenos de Orio (Guipúzcoa, Cuenca Vasca)
(Sociedad Geológica de España, 1990)The influence of the Triassic Diapir of Zarautz upon the sedimentation of the coarse-grained deep-water deposits of Paleocene age situated near Orio (Gipuzkoa) is assessed by mean of a detailed geological mapping, coupled ... -
Introducción al estudio de los indicios cupríferos de Riner y de Clariana (Depresión geológica del Ebro, Solsonés, Cataluña)
(Sociedad Geológica de España, 1990)The present work has developed about three indications of Cu, localised in the region of Solonés, in the localities of Riner and Clariana. The three cases are situated among the materials of Formation Solsona, which refill ...
