Browsing Geogaceta -- Nº 06, (1989) by Title
Now showing items 1-20 of 37
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Análisis de isótopos de oxígeno y edad Rb-Sr del plutón zonado de Caldas de Reyes (Galicia, España)
(Sociedad Geológica de España, 1989)Oxygen and strontium isotope composition of the external and external-leucocratic facies suggest an origin essentially by partial meeting of crustal materials for the postkinematic Caldas de Reyes granitic s.l. massif. On ... -
La arenisca de Villamayor: Influencia de la humedad en su resistencia
(Sociedad Geológica de España, 1989)Villamayor sandstone is the main ancient and modern building material in Salamanca. The results of the tests relates the failure strength with the moisture content and the strain -
Asociaciones de facies en los fan deltas de las cuencas neógenas y cuaternarias de las Cordilleras Béticas Orientales
(Sociedad Geológica de España, 1989)Fan deltas occur in a wide range of tectonic and sedimentary settings which are likely to generate a varied mosaic of facies associations. Fan delta deposits provide a good geodynamic record of basins as illustrated by ... -
Bioerosión en ostrácodos
(Sociedad Geológica de España, 1989)Evidences of organic interaction between ostracods and Other animal groups has been found in the Neogene of the Guadalquivir Basin. The ostracod faunas present bioerosion fenomenes, which are here studied -
Bioestratigrafía con foraminíferos planctónicos y nanoplancton calcáreo de la sección de Campo (paraestratotipo del Ilerdiense)
(Sociedad Geológica de España, 1989)A biostratigraphic study of Campo section (Ilerdian parastratotype) has been carried out by means of planktonic foraminifera and calcareous nannoplankton. The most standard and recent biozonations for Lower Eocene (Ilerdian ... -
Ciclos deltaicos en el Jurásico Superior del flanco oeste del diapiro de Caldas da Rainha, Portugal
(Sociedad Geológica de España, 1989)Three litoestratigraphic unites have been identified in the São Martinho do Porto sea cliffs, which correspond with three deltaic cycles. The paleocurrents analysis show that for the first two cycles, the sediments come ... -
El complejo deltaico de Sant Llorenç del Munt (Eoceno del borde suroriental de la depresión del Ebro)
(Sociedad Geológica de España, 1989)St. Llorenç del Munt fan delta is situated in the Northeast of the Ebre basin. Three main stratigraphic units, equivalent to depositional sequences are distinguished and plotted in figure 2. In proximal fan delta areas ... -
Consideraciones sobre algunas anomalías hidrogeoquímicas existentes en la unidad Balerma-Las Marinas (Campo de Dalías, Almería)
(Sociedad Geológica de España, 1989)The waters saturating the Balerma-Las Marinas Unit, one of three that form the Campo de Dalías region, locally have high total salt contents whose probable origin is related to mixing with trapped salt waters within ... -
Contaminación por compuestos nitrogenados en el acuífero aluvial de la confluencia de los ríos Jarama y Henares: Origen y evolución
(Sociedad Geológica de España, 1989)The presence of nitrogen compounds in an aquifer is an evidence of pollution. In the aquifer studied, these compounds reach, in 50% of the analyzed samples, levels of nitrite, nitrate and ammonium too high for the water ... -
Controles en la sedimentación del Cretácico Inferior de Aguilón (Zaragoza, Cordillera Ibérica Septentrional)
(Sociedad Geológica de España, 1989)Lower Cretaceus sediments (Hauteriviam to Barremian) in Northern Iberian Chain (Aguilón, Zaragoza) are deposited in a shallow lacustrine environment. Three main shallowing upward sequences are developed. In the upper two ... -
Datos sobre la geología y petrología del Macizo de Amanay, Fuerteventura, Canarias
(Sociedad Geológica de España, 1989)The Amanay Massif in the island of Fuerteventura is built up by a series of hypoabyssalsubvolcanic alkaline rocks (ultramafics, gabbros and syenites) intruded by several basaltic dyke-swarms of regional extension. The ... -
Depósitos litorales en el Jurásico superior del Cabo Mondego. Portugal
(Sociedad Geológica de España, 1989)Facies analysis of the Upper Jurassic sequence, exposed along Cabo Mondego sea cliffs, suggest that their deposition occured under nearshore environments. These environments were controlled by tides and in some cases by ... -
Dinámica del proceso de alteración ambiental de la «piedra de Villamayor»
(Sociedad Geológica de España, 1989)The Villamayor sandstones, Upper Paleocene in age, are composed of strongly arkosic fluvial sediments. The sediment is organized in sequences of decreasing grain size of which only one part can de exploited for construction ... -
La estructura del plutón granítico de Boal (Asturias, España): Nuevas aportaciones sobre su «fabric» interna y modo de emplazamiento
(Sociedad Geológica de España, 1989)In this paper we attempt to sketch the structural pattern of the Boal pluton (WestAsturian-Leonese Zone) and provide new data which account for a pasive mode of emplacement and a subsequent structural evolution probably ... -
Estudio estratigráfico y paleogeográfico de la Unidad Informal de San Miguel de Pedroso (Neógeno del Pasillo de Los Montes de Oca, Burgos)
(Sociedad Geológica de España, 1989)The stratigraphy and sedimentology of the San Miguel of Pedroso unit from the Oca's Mountain Corridor (Between Duero Basin and Ebro). Its Palaeogeography during Neogene as well as these materials show important lateral ... -
Fraccionación de los elementos traza durante la fusión parcial incongruente de metapelitas
(Sociedad Geológica de España, 1989)During anatexis of metapelites, the trace element fractionation can't be modelled by the mathematical expressions derived by Shaw (1970). In this case, the equations of Hanson (1978) should be used, when the mineralogy of ... -
Hidrogeoquímica regional de un transecto arcósico de la Cuenca del Duero
(Sociedad Geológica de España, 1989)lt's exposed the global chemical evolution from the grounwater in a sector of de Duero basin and its relation with the subterrane flow. In this way, the results have been got from the inventary of 259 water points and from ... -
Influencia del paleokarst en la mineralogía de arcillas del Lias de Algarinejo (Subbético medio)
(Sociedad Geológica de España, 1989)A clear relationship exists between the kaolinite content of the mid-Domerian to mid-Toarcian rocks of the Algarinejo section and the emersion at the same time of the Loma de las Ventanas section some 10 km away. A model ... -
Major Pleistocene and Holocene glacial episodes in the Khumbu region, southern side of Mount Everest (Nepalese Himalaya)
(Sociedad Geológica de España, 1989)Se amplía hacia la vertiente meridional del Everest la cartografía de la geomorfología glaciar realizada anteriormente por los autores en el sector tibetano de este macizo. Se distinguen cuatro fases glaciares principales ...