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Browsing Geogaceta -- Nº 13, (1992) by Title
Now showing items 1-20 of 36
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Análisis comparativo de anomalías hidroquímicas del acuífero de Madrid
(Sociedad Geológica de España, 1992)The mineralization of 43 groundwater brackish samples collected from wells located in marginal areas of the Madrid acuifer are compared in this paper. This analysis shows some significatives differences between the three ... -
Análisis de la fracturación asociada a las alteraciones hidrotermales de tipo Greisen y Episienita en la Sierra del Guadarrama
(Sociedad Geológica de España, 1992)Several episodes of hydrothermal activity have recently been dated in the Sierra del Guadarrama (Caballero et ai, 1992a). Stress analysis based upon the fault sets associated with 300-290 M.a. (Wlodes and greisens) and ... -
Análisis de la fracturación asociada a las alteraciones hidrotermales de tipo Greisen y Episienita en la Sierra del Guadarrama
(Sociedad Geológica de España, 1992)Several episodes of hydrothermal activity have recently been dated in the Sierra del Guadarrama (Caballero et ai, 1992a). Stress analysis based upon the fault sets associated with 300-290 M.a. (Wlodes and greisens) and ... -
Avance del estudio gravimétrico del batolito central de Extremadura (España)
(Sociedad Geológica de España, 1992)The Gravity map of the Central Extremadura Batholith has been carried out taking and processing 776 field gravity stations supported by eight bases, which are linked to the International Gravity Standardization Net (IGSN-71) ... -
Breve introducción al estudio de las mineralizacíones industriales conquenses: los materiales geológicos metalúrgicos
(Sociedad Geológica de España, 1992)We shall try to do a short synthesis w ith this comm unication, which will be of use for a future study about industrial mineralisations in Cuenca. For this purpose, we shall establish a sucession of groups concerning the ... -
Breves consideraciones en relación a la expresión "Minerales y rocas industriales"
(Sociedad Geológica de España, 1992)In this communication, we`ll do short considerations about commoly used expression of "minerals and industrial rocks", in our opinion, totally incomplete, and we`ll plan an alternative to suply its deficiencies -
Características generales del Edificio Norte de la Serie I de Fuerteventura
(Sociedad Geológica de España, 1992)The North Edifice is one ofthe three main edifices identified in the Old Basaltic Series of Fuerteventura. This edifice is formed by Lower, Intermedium and Upper Series. The oldest one crops out on the low western side ... -
Caracterización de las micas de las pizarras cámbricas de la unidad Alconera (Zona de Ossa-Morena). Su utilidad como indicadores de las condiciones metamórficas
(1992)The absence of diagnostic parageneses in the Cambrian metapellites of "Alconera" unit (Hesperian Massif, Spain) has precluded the determination of metamorphic conditions. White mica crystallinity index and composition, ... -
Contribución al conocimiento de la dinámica de la vegetación en el sector oriental del Sistema Central español, en base al análisis polínico
(Sociedad Geológica de España, 1992)Based on the study of the peat-b o g PM VII, located in the Puerto de Morcuera, both the vegetation dynamics and the anthropic influence in the last 1.000 years have been elucidated. Near 640± 50 BP (UCRA-362) this area ... -
Contribución al conocimiento geológico y geoquímico de los granitos de Albalá y Montánchez (Extremadura Central) y su relación con las mineralizaciones de estaño y wolframio
(Sociedad Geológica de España, 1992)D etailed geological mapping o f the granitoids that make this part o f Central Extremadura ( A lb a li and Montanchez stocks) shows different magmatic rocks which have been geochemically characterized using major, trace ... -
Datación por el método Sm-Nd del filón con F-Ba (Pb-Zn) de la mina San Eusebio (Sierra de Guadarrama, España)
(Sociedad Geológica de España, 1992)S m -N d d a tin g o f F-Ba (Pb-Zn) veins enclosed in a d a m e llite s o f the Spanish C e n tra l System suggests an age of 152± 25 M.a. (Late Jurassic) for this hydrothermal stage. This age supports an unconformity-related ... -
Dinámica de la vegetación actual y aplicación de su espectro polínico en la reconstrucción de la paleovegetación en la Sierra de la Paramera (Avila, España)
(Sociedad Geológica de España, 1992)In this study we will show pollinic data of the present spectra of several transects carried out in the mountain range 'Sierra de la Paramera', situated in the province of Avila. These data reflect the variations in the ... -
Distribución espacial de los minerales de la arcilla de Campo Arañuelo
(Sociedad Geológica de España, 1992)We have studied the spatial distribution of clay minerals of Campo Arañuelo basin by their trend analysis surfaces. The data of kaolinite and illite decrease from "Sierra de Gredos" (main source) to “Montes de Toledo", in ... -
Un ejemplo de tectónica salina: el sector NE del Surco de Valencia
(Sociedad Geológica de España, 1992)The messinian salt develops salt rollers, pillows and diapirs in the linking zone between the Valencia Trough and the Provenga! Basin. The correlation of the different structures based on the sedimentary wedges linked to ... -
Estudio geohidrológico de la finca «El Piul» (Rivas-Vaciamadrid) Madrid
(Sociedad Geológica de España, 1992)The extraction of gravel in fluvial valleys that are below groundwater table, cause the appearance of lakes. The perm an ency of posterior refilling of those lakes can modifice the geohydraulic structure of the afected ... -
Evolución tectonotermal de la Unidad de Santiago (Complejo de Ordenes): un ejemplo de subducción eo-hercín¡ca y descompresión sin-colisional
(Sociedad Geológica de España, 1992)The syn-D2 uplift of the Santiago Unit, inmediately after of the high-pressure eo-Hercynian metamorphic event, cause a markedly decompressive-slightly prograde P,T,t path. This path very likely suggests that the majority ... -
Existencia de una plataforma carbonatada del Albiense Superior entre materiales terrígenos de mar somero (Karrantza-Trucíos, Bizkaia)
(Sociedad Geológica de España, 1992)Facies analysis and distribution in the Karrantza and Trucfos Valleys have allowed a detailed correlation of Upper Albian series. A new carbonate platform belonging to the Urgonian Complex is described and correlated with ... -
La falla de San Saturio (Soria)
(Sociedad Geológica de España, 1992)In this paper we intend to offer a geological interpretation of the northern border of the Almazân basin based on a geophysical prospection . The contact of this basin with the Iberic Range has been very conditioned by the ... -
Geocronología por el método Rb-Sr de las episienitas de la Sierra del Guadarrama, S.C.E., España
(Sociedad Geológica de España, 1992)Rb-Sr dating by internal isochrones of the episyenitea (hydrothermally dequartzified and alkalimetasomaticed granites) from the Sierra de Guadarrama gives an age of 274+-6 M.y., i.e.. Early Permian. The epysienites were ... -
Incidencia ambiental de un vertedero sellado de residuos sólidos localizado en Móstoles (Madrid) sobre la composición natural de las aguas subterráneas
(Sociedad Geológica de España, 1992)In this paper, some considerations about the negative effects due to leachates of Mdstoles sealled landfill on groundwater quality are presented. The results show an important increase in the values of Conductivity, COD, ...
