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Geogaceta -- Nº 18, (1995): Recent submissions
Now showing items 21-40 of 54
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Origen de las piritas de la cuenca de Cameros, (La Rioja)
(Sociedad Geológica de España, 1995)The pyrite mineralizations of the Cameros basin has been traditionally interpreted as diagenetic. On the basis of trace element content, S isotopes study, pyrite inclusions and geologic observations, the pyrite crystals ... -
Modelo de interacción de las corrientes de marea en la desembocadura del estuario mesomareal del Río Guadiana, (S.O. España-Portugal)
Morales González, Juan Antonio
(Sociedad Geológica de España, 1995)
The mesotidal Guadiana River Estuary, and all the estuaries located along the Huelva Coast present ebb tidal deltas infront of their mouth, that are unexplainly curved to west; in the same way, authors have observed turbidity ... -
Mecanismos generadores de escorrentia en la vertiente de sierra de Gador (Almería)
(Sociedad Geológica de España, 1995)The factors contributing to the generation of runoff episodes on the southern edge of the Sierra de Gâdor are analised. The study includes the analysis o f physical characteristics as well as the temporal distribution of ... -
Los yacimientos Plio-Pleistocenos del Grupo Peninj (Oeste del lago Natrón, Tanzania)
(Sociedad Geológica de España, 1995)During July 1994 field work was performed at the Peninj Group Sedimentary Formations (Plio- Pleistocene) of West lake Natron (Northern Tanzania). As a result several palaeontological and archaeological bearing sites were ... -
Historia geológica de la cuenca de Lorca (Murcia): influencia de la tectónica en la sedimentación
(Sociedad Geológica de España, 1995)Neogene sedimentation in the Lorca basin has been related to tectonics specially to Basin's Central Fault, whic has alternately like inverse and normal according to compressive ord is tensible phases; likewise the depocentre ... -
High 834S in pyrite from magnetite-rich beds in the Urbana Limestone (eastern Sierra Morena)
(Sociedad Geológica de España, 1995)Anomalous high S34S (+39.7 o/oo and +45.5 o/oo) in pyrites from iron-beds in the Urbana Limestone are interpreted as a result of biogenic reduction of pore water sulphate in a system closed to H2S and SO2' and upwards ... -
Glauberita-Thenardita de la formación Kirmir (Neógeno, cuenca Beypazari, Turquía)
(Sociedad Geológica de España, 1995)This paper studies the petrologic and sedimentologic characteristics of the sodium-sulphate deposit which intercalates within the evaporatic facies of the Kirmir Formation (Miocene, Bypazar/Basin, Central Anatolia) -
Evolución del paisaje en la Sierra de Peneda (NO de Portugal) durante los últimos 3500 BP
(Sociedad Geológica de España, 1995)We presented data pollen of the three deposits, sounding located in Peneda Mountain Range (NW from Portugal). The values of data C l 4, show the evolution of the landscape during the last 3.500 BP. The most interesting ... -
Evolución en el subsuelo de los sistemas de abanicos aluviales del Mioceno de la cuenca de Madrid (España)
(Sociedad Geológica de España, 1995)This paper deals on Madrid Basin miocene evolution from drill hole lithologs re-interpretation. To avoid differencial subsidence and tilting, "sand"/"clay" ratios were calculated from 100m tickness intervals. Morphology ... -
Estudio mineralógico de las variscitas y turquesas silúricas de Punta Corveiro (Pontevedra, España)
(Sociedad Geológica de España, 1995)In this paper we resume the geological and essential mineralogical characteristics of the phosphated mineralization found in the Silurian of W sector in the Pontevedra province, in "Punta Corveiro", south of La Lanzada ... -
Estudio de plagioclasas de granitoides híbridos del Macizo Ibérico mediante microscopía de Interferencia de Contraste Nomarski
Rosa Díaz, Jesús de la; Quintero, M. (Sociedad Geológica de España, 1995)
Nomarski microscopy has revealed strong zoning in plagioclases of hybrid graitoids of Gerena massif (Seville Range batholith) consisting of oscillatory, hiatus, dendritic and resorption zones which can repeat several times ... -
Expansión de un sistema lacustre en el tránsito Jurásico Cretácico (Cubeta de Aliaga, Prov. Teruel)
(Sociedad Geológica de España, 1995)In the Aliaga subbasin (Central Iberian Range) crops out a mainly calcareous serie corresponding to the Tithonic-Berriasian Villar Arzobispo Formation. There are important litological differences between this serie and ... -
Exhumación alpina del bloque morfotectónico Pedriza - La Cabrera (Sierra del Guadarrama, Sistema Central Español): potencialidad de la termocronometría por trazas de fisión en apatitos
(Sociedad Geológica de España, 1995)The principles of Apatite Fission Track Analysis (AFTA), which allows to decipher the time-temperature paths of apatites since their last cooling below about 110°C are given and one example, from a Pedriza - La Cabrera ... -
Evolución tectonotermal del Macizo Hercínico de Rehamna en la región de Skhour - Ouled Hassine - Lalla Tittaf (Meseta Occidental, Marruecos)
(Sociedad Geológica de España, 1995)In the Rehamna Massif, In the Moroccan Hercynian Belt, metamorphic peak conditions in the LI - T part o f the amphibolite facies were reached during the development o f a intermediate P/T - barrovian like - metamorphism, ... -
Evolución sedimentaria reciente de las Tablas de Daimiel (Ciudad Real)
(Sociedad Geológica de España, 1995)Two sedim entary events have been distinguished in the recent evolu tio n o f the present Tablas de Daimiel National Park. The older one is characterized by the presence of siliceous sands and silts, and mudstones; the ... -
Estudio de una transversal entre la cuenca de Madrid y la Cordillera Ibérica a partir de datos estructurales, sísmicos y gravimétricos
(Sociedad Geológica de España, 1995)An integrated geophysical and geological study has been carried out along a trasverse extending from the Madrid Basin to the Iberian Range. Geological and seismic reflection data were used as background model for the gravity ... -
Estructuras pseudoanticlinales inducidas por fluidificación en la Unidad Intermedia de la cuenca de Calatayud
(Sociedad Geológica de España, 1995)Soft sediment deformation structures are described in a dolomitic palustrine-lacustrine sequence in the neogene Calatayud basin. Pseudoanticlines with associated dish structures are possibly result of a fluidization process ... -
El límite de las Biozonas Transversarium y Bifurcatus (Oxfordiense Medio) en la Cordillera Ibérica nororiental: discontinuidades y lagunas estratigráficas asociadas
(Sociedad Geológica de España, 1995)A biostratigraphic study of Middle Oxfordian, Transversarium to Bifurcatus Zone rocks in the northeastern Iberian Chain (Spain) has been taken along six detailed sections providing very close ammonite control. The deposition ... -
Diferenciación química de aguas subterráneas mediante Análisis Multivariante. Aplicación a los acuíferos de la Sierra de Gádor (Almería)
(Sociedad Geológica de España, 1995)Waters in carbonate materials have often been classified on a hydrogeologic basis. The significance of each grouping in understanding the geochemical processes acting in the aquifer dependents on the classes having a ... -
Determinación experimental de la función de dilatancia de un suelo granular denso
(Sociedad Geológica de España, 1995)This paper presents an experimental method to determine the dilatancy function of a dense granular soil. The knowledge of that function is essential to modelize the geomechanical behaviour of the soil because it controls ...
