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Browsing Geogaceta -- Nº 20-3, (1996) by Title
Now showing items 1-20 of 66
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3He/4He ratios in and around Teide volcano, Tenerife, Canary Islands, Spain
(Sociedad Geológica de España, 1996)Helium-3 emission spatial distribution in and around Teide volcano, Tenerife, Canary Islands, has a quite different pattern from other stratovolcanoes which show usually a decreased trend for the 3He/ 4He with respect to ... -
Análisis multivariante de datos químicos en Granitoides Tardihereinicos
(Sociedad Geológica de España, 1996)The application of multivariate analysis to whole rock chemical data allow us to obtain important conclusions about their particular evolutive history. In the example developed below, starting from one population of ... -
Análisis petrográfico automático en Carbones de Capa
(Sociedad Geológica de España, 1996)Anew system has been developed to improve the interlaboratory accuracy in maceral and reflectance analysis of single seam bituminous coals. It performs automatically both types of analysis, following the same steps as the ... -
Analysis of the evolution and rank distribution of coals from the Oyon basin (Upper Jurassic) of Peru
(Sociedad Geológica de España, 1996)The Oyon Coal Basin (Upper Jurassic) is located in the central part of Peru and it is centered around two nuclei of very faulted and strongly tectonized anticlines. The middleupper part of the Oyon Formation which is ... -
Características composicionaies y procesos de evolución magmàtica en el complejo volcánico Sur - II de Fuerteventura (Islas Canarias)
(Sociedad Geológica de España, 1996)The Southern Volcanic Complex II consists mainly of basalts with some trachybasalls and basaltic trachyandesltes. Its lower sequence is formed by middle alkaline rocks whilst in the upper one only m ild ly alk ali H y + O ... -
Características composicionales y procesos de evolución magmàtica en el complejo volcánico sur-lll de Fuerteventura (Islas Canarias)
(Sociedad Geológica de España, 1996)The Southern Volcanic Complex III is form ed by basalts, a lesser am o u n t o f trachybasalts and some scarce trachytes, a ll o f them m ild ly alkaline. Crystal fra ction ation w a s in an early stage, controle d by ... -
Características geoquímicas preliminares de azabaches artesanales del Kimmeridgiense de Asturias
(Sociedad Geológica de España, 1996)The soluble organic m a tte r o f the Kim meridgian Asturias j e t has been studied b y gas chrom atography/ mass spectrometry. The sample was obtained by extractive sonication with carbon disulfide as solvent. The q ... -
Caracterización de las Calizas de Almayate (Malaga) y evaluación de la calidad técnica como Materiales de Construcción
Carretero, María Isabel; Mayoral Alfaro, Eduardo
; Galán Huertos, Emilio (Sociedad Geológica de España, 1996)
Since XVIII century, Miocene-Pliocene limestones from Almayate (Málaga) were used In historical buildings o f Western Andalusian Heritage. They are sandy bioclastic limestones, w it h high p o ro s ity and water absorption, ... -
Caracterización de los fluidos en sucesivas fases de fracturación en las Cadenas Costero Catalanas y su registro en los filones de Ba-F de baja temperatura
(Sociedad Geológica de España, 1996)In the F-Pb-Zn Berta mine (Catalonian Coastal Ranges), fluid inclusion, stable and radiogenic isotope data have allowed to recognize two different and temporally separated hydrothermal events. The first is characterized ... -
Caracterización tecnológica de las materias primas Cerámicas de La Sagra (Toledo)
(Sociedad Geológica de España, 1996)This work approaches the study and technological characterization of the clayey and not clayey raw materials, used in the ceramic brick industry in «La Sagra», Toledo province. In addition to the mineralogical an chemical ... -
Condiciones metamórficas de las metabasitas del Roc de Frausa (Pirineos Orientales)
(Sociedad Geológica de España, 1996)An approach to the metamorphic conditions based in mineral paragenesis of metabasites from different areas of Roc de Frausa Massif has been made. Regional peak metamorphism is showed by the metamorphic paragenesis in ... -
Determinación del índice de Huecos o «Air Void» en un Hormigón
(Sociedad Geológica de España, 1996)Several characteristics of the dispered air bubbles in aerated concrete have been indicated as very im p o rta n t to the stu d y o f the fun ction o f en tra in ed air. This artic le describes the d iffe re n t stages in ... -
Diferenciación geoquímica de los materiales en facies «Weald» de la Cuenca NE de Cameros (Soria - La Rioja)
(Sociedad Geológica de España, 1996)The Cameros Basin ( N W o f the Iberian Range) is m a in ly composed o f very homogeneous silicic d e tr ita l m aterials in Weald facies. The occurrence o f c h lo rito id , cookeite, p y rite an d muscovite/p aragonite ... -
Distribution and origin of soil gas C02 and CH4 in and around Cañadas caldera, Tenerife, Canary Islands, Spain
(Sociedad Geológica de España, 1996)The distribution and origin of soil gas C 0 2 and C H 4 were investigated to have abetter understanding on the levels of diffuse degassing at the surface environnent of Cañadas caldera (Tenerife, Canary Islands). Soil gas ... -
Dolomitización bajo superficies de ruptura sedimentaria: estudio comparativo de las dolomías del Turoniense-Coniaciense (El Ribero) y Maastrichtiense superior (Quecedo) del Norte de Burgos (España)
(Sociedad Geológica de España, 1996)Substantial dolomitization and calcitization processes occurred in upper Turonian-lower Coniacian and upper Maastrichtian-lower Danian carbonates at El Ribero and Quecedo sections, respectively. Carbonate precipitation ... -
Dolomitización en materiales del tránsito Cretácico-Terciario en la Sección de Quecedo (Norte de Burgos, España)
(Sociedad Geológica de España, 1996)Diagenetic processes of dolomitization and calcitization have been recorded from the upper Maastrichtian -lower Danian shallow-marine carbonate rocks at Quecedo. Dolomitization is associated to a first order sequence ... -
El "Crema Marfil" (Pinoso, Alicante) I. Características petrofísicas y parámetros de durabilidad
(Sociedad Geológica de España, 1996)The natural stone named "Crema Marfil " is mainly extracted from Coto Pinoso Quarries (Pinoso, Alicante) and their geological prolongations. This natural stone maybe classified as a biosparite-biomicrite w ith veins and ... -
El "Crema Marfil" (Pinoso, Alicante) II. Criterios petrográficos de calidad
(Sociedad Geológica de España, 1996)Petrographical features determine physical properties and appearance and as a consequence of this fact the q u a lity o f o rnam ental stones. Phreatic cem ent macrocrystals in fluence the agreeable lig h t c o lo u r of ... -
El complejo leucogranítico tardí-hercínico de afinidad alcalina de Tossa de Mar (Cadenas Costeras Catalanas, NE de España)
(Sociedad Geológica de España, 1996)The late-Hercynian batholith of the Catalonian Coastal Ranges (NE Spain) represents a typical highK calc-alkaline association. In the Tossa de Mar area, the calc-alkaline rocks are intruded by a highly acidic leucogranitic ... -
El Olivino de las rocas volcánicas miocenas de la isla de Fuerteventura (Islas Canarias)
(Sociedad Geológica de España, 1996)Olivine phenocrysts are always present in the Miocene basalts of Fuerteventura, whilst they are scarce in the trachybasaltic types. Notwithstanding, olivine is common as part of the groundmass in these trachybasalts. This ...
