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Browsing Geogaceta -- Nº 25, (1998) by Issue Date
Now showing items 1-20 of 53
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Tortugas y sirenios fósiles en el Eoceno marino de Navarra y Cuenca de Jaca
Astibia, H.; Murelaga, Xabier; Payros, Aitor; Pereda Suberbiola, Xabier; Tosquella Angrill, Josep
(Sociedad Geológica de España, 1998)
We report several remains of turtles and sirenians from the marine Eocene (Bartonian) of the Pamplona Area (Navarre) and Santa Cilia de Jaca (Huesca), South Pyrenean Basin. Turtles are represented by fragmentary neural ... -
El Macizo de Mérida, un arco volcánico cadomiense reactivado en el hercínico
(Sociedad Geológica de España, 1998)The Merida igneous outcrops are situated in the Obejo-Valsequillo-Puebla de la Reina Domain (DOVPR) of the northern Ossa-Morena Zone (Iberian Massif). This massif is composed by plutonic and volcanic rocks. These rocks are ... -
Alteraciones caoliniticas sobre rocas Plutonicas en Sierra Morena Occidental (Sierra de Aracena, Huelva)
(Sociedad Geológica de España, 1998)This work makes a morphological description and a physical and quimical analysis of two paleosols over plutonic rocks in the Sierra de Aracena (Huelva province). Note their kaolinitic characteristic and the high levels of ... -
Procesos de transformación y neoformación de esmectitas en los materiales volcanoclásticos de la isla de La Palma (Canarias)
(Sociedad Geológica de España, 1998)Clay minerals from the volcaniclastic deposits of the three different sedimentary settings (paleosols, continental lacustrine and transitional, fan delta) have been studied by X-ray, MEB y TEM. The clay fraction of this ... -
Relaciones estadísticas entre las propiedades hidrodinámicas y geoeléctricas del acuífero de Charf El Akab ( Marruecos )
Achagra, L.; Sarroukh, M.; Benjbara, A.; Stitou el Messari, Jamal; Cerón García, Juan Carlos (Sociedad Geológica de España, 1998)
It is considered the examen of statistical relationship between the transmissivity and transverse resistance of the water bearing materials of the CharafEl Akab, where larges samples of both parameters are available, is ... -
Cálculo de la anomalía gravimétrica de una cuenca sedimentaria. Su aplicación en la cuenca de Almazán
(Sociedad Geológica de España, 1998)Almazan Tertiary Basin has a well known geometry based on seismic surveys. From these data, the gravity anomaly due to tertiary sediments has been carried out using the Bhaskara Rao, Prakash, and Ramesh Babu (1990) method. ... -
El Arco del Andén Verde, un gran deslizamiento gravitacional en la costa noroeste de Gran Canaria (Islas Canarias)
(Sociedad Geológica de España, 1998)A sector of the northwestern coast of Gran Canaria (Canary Island) shows morphological and tectónica! characters, here described, wich demostrate the presence of a big gravitational landslide of the debris avalanche type, ... -
Inocerâmidos y belemnites del Cretâcico Superior en facies de la creta (Aquitania, Pays de Caux, NE Ardenas): diferente comportamiento frente a la diagénesis
(Sociedad Geológica de España, 1998)Upper Cretaceous inoceramid bivalves and belemnite rostra from three sections (Aquitaine, Pays de Caux and NE Ardennes) are petrologically and geochemically analysed. The coarse prismatic calcite of the inoceramid shells ... -
Estratigrafía y estructura del área de Los Mansuetos (Cuenca de Teruel). Precisiones para la definición del estratotipo del Turoliense
(Sociedad Geológica de España, 1998)Detailed mapping of the Los Mansuetos area, located northeast of the town of Teruel, allows a better lithostratigraphical definition of the Upper Miocene to Pliocene continental sediments exposed in the area. Six main ... -
Modelización hidrogeoquímica del agua de infiltración en la Cueva de Nerja (Málaga)
(Sociedad Geológica de España, 1998)A hydrochemical study of the drip water in the Nerja Cave has been carried out using geochemical modeling. Results indicate that major ions in the infiltration water are meteoric in origin (évapotranspiration of rain water ... -
Primeros resultados magnetoestratigráficos del Triásico Medio-Superior (Ladiniense-Karniense) en la Cordillera Ibérica occidental (Cuevas de Ayllón)
(Sociedad Geológica de España, 1998)A magnetostratigraphic investigation on a Middle-Late Triassic section outcropping at Cuevas de Ayllon (westernmost margin of the Iberian Ranges, Spain) has been performed. The section mostly consists of a thick sequence ... -
Factores de control en el desarrollo de facies arrecifales y oncolíticas en la zona media de una rampa carbonatada (Kimmeridgiense, Cuenca Ibérica)
(Sociedad Geológica de España, 1998)The Teniente Mb. (Kimmeridgian, Iberian basin) is a reefal and oncoUtic fades belt, placed in the external part of the middle ramp areas, between mid ramp marly facies and outer ramp micritic facies. The unit was originated ... -
Una discontinuidad estratigráfica de 6 m.a. en las calizas albienses de Aitziber (Navarra)
(Sociedad Geológica de España, 1998)The Aitziber calcarenites is a sedimentary unit of Upper Albian (appenninica with buxtorfi zone) age. The top of this unit records an unconformity of at least 6 m.a.. The hiatus extends from the uppermost Albian to lower Turonian -
El Bathoniense-Kimmeridgiense (Jurásico medio-superior) en la región de Obón-Torre de las Arcas (Teruel)
(Sociedad Geológica de España, 1998)The middle-upper Jurassic of the Obón-Torre de las Arcas area (Teruel province, northern Iberian Chain) consists of five stratigraphic units. Unit I is formed by oolitic grainstones (c. 20 m thick) and was developed during ... -
Distribución de contituyentes minoritarios y traza en las aguas subterráneas de la cuenca de Baza (Granada)
(Sociedad Goelógica de España, 1998)Geochemical research has been carried out on 43 groundwater samples from the detrital aquifer of Baza-Caniles, in order to evaluate the pattern of some minor and trace elements (F, Sr, Al, Cd, Cr, Cu, Fe, Hg, Mn, Ni, Pb ... -
Alteraciones esmertítico-caolmíticas en Sierra Morena Occidental (Sierra de Aracena, Huelva)
(Sociedad Geológica de España, 1998)This work deals with the morphological and physical-quimical description of three paleosols develop over plutonic materials and located at depressional areas in the Sierra de Aracena (Huelva province). Note their clayey ... -
Comparación entre el metamorfismo de la Cuenca de Cameros y el de la Cuenca Aurífera de Witwatersrand (Suráfrica). Implicaciones Metalogenéticas
(Sociedad Geológica de España, 1998)The Witwatersrand Coldfield (WCF) and the Cameros Basin (CB) were subjected to widespread fluid flow during metamorphism. Physical conditions reached at the thermal peaks have been estimated at 1 kb and 340°C in the case ... -
Sistemas de protección de costas (I): Regeneración de playas. El ejemplo del Maresme (1987-1998)
(Sociedad Geológica de España, 1998)After repeated construction of permanent structures to prevent erosion in the Maresme coast (NE Barcelona), artificial nourishment of beaches started in late 80's. Ten years of beach monitoring have allowed to evaluate the ... -
Influencia del bitumen sobre la calidad de un reservorio siliciclástico: Aplicación al campo de Salam en el desierto occidental de Egipto
(Sociedad Geológica de España, 1998)Bitumen are rarely taken into account in the petrophysical characterization of reservoirs because they may be rather difficult to distinguish. This paper focuses on the effects of bitumen on the reservoir quality of the ... -
The largest mercury anomaly on Earth (Almadén, Spain): a mantle-derived feature?
(Sociedad Geológica de España, 1998)The Almadén Hg deposits are associated with deeply altered magmatic rocks, which main features are briefly described here. Geochemical, including isotopic, data on these rocks suggest that they are derived from deep mantelic ...
