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Browsing Geogaceta -- Nº 10, (1991) by Title
Now showing items 1-20 of 49
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Alineamientos preferentes en el campo de dolinas de Villar del Cobo (Teruel)
(Sociedad Geológica de España, 1991)Thinking about the central of the 414 dolinas that have been determined in Villar del Cobo (Teruel, Spain), the more frequent directions the linear elements wich connect this centres are shown clearly -
Análisis de enjambres de cliques radiales utilizando un método matemático
(1991)It is proposed, a computer program to help to the interpretation of radial dykes swarms and locate the possible emission zones, using the analysis of theoretical intersection of the dykes, considered as straight lines on ... -
Anfíboles cálcicos de las cortlanditas de la Sierra de Gredos, Sistema Central español
Calcic amphibo[es from cortlanditic rocks of the Sierra de Gredos were analized with the aim of knowing chemical controls and crystallization conditions. These amphiboles constitute part of the intercumular skeleton. They ... -
Caracterización de las facies de la transición canal-lóbulo en la secuencia Jata del Flysch Negro (Albiense Superior norte de Vizcaya)
(Sociedad Geológica de España, 1991)Channel-lobe transition deposits have not been well documented in the ancient record. The apparent continuous spectrum between the two end members involved, channel-fill and lobe deposits respectively, has left this facies ... -
Los ciclos sedimentarios del Eoceno medio y superior en el sector NE de la depresión del Ebro (zona de Bergas-Vic). Caracterización de sus Iímites
(Sociedad Geológica de España, 1991)In the middle and upper Eocene strata of the South Pyrenean foreland basin, three sedimentary cicles have been distinguished. These cycles are bounded by angular uncorfirmities, each cycle being related to the development ... -
La cobertera paleozoica posthercínica en el Oriente de Asturias
(Sociedad Geológica de España, 1991)The discovery of plant fragments in the basal marine quartzites of the post-Hercynian cover at the locality of Mestas de Con (Asturias), which have been determined as Stephanian C or Autunian, allows dating the end of the ... -
Comparación entre cortlanditas s.l. de dominios internos (Sistema Central) y externos (Batolito de la Sierra Norte de Sevilla) del Macizo Ibérico
Moreno-Ventas Bravo, Ignacio
; Rosa Díaz, Jesús de la; Castro Dorado, Antonio (Sociedad Geológica de España, 1991)
A comparison is made between cort/andies from different localities of the Iberian massif in order ot interpret the observed relationships. The presence of intercumular phlogopite is exclusive of cortlandites from the inner ... -
Composición de las biotitas de las cortlanditas de la Sierra de Gredos, Sistema Central español
Moreno-Ventas Bravo, Ignacio; Castro Dorado, Antonio (Sociedad Geológica de España, 1991)
Biotites from cortlanditic rocks of the Sierra de Gredos (Central System) were analyzed with the microprobe. The first results of this study are presented here. These include a brief discussion about the dominant coupled ... -
Contenidos de materia órganica de formaciones evaporíticas peninsulares
(Sociedad Geológica de España, 1991)More than two hundred lutitic samples belonging to severa/ marine and non-marine evaporitic formations (Triassic to Upper Miocene) in the Iberian Peninsula were studied by the Rock Eval pyrolysis method and gas chromatography ... -
Contrasted evolution of the western and eastern Mediterranean since Neogene Time
(Sociedad Geológica de España, 1991)La evolución del Mediterráneo después del climax del orógeno Alpino, se sue/e explicar por medio de zonas de subducción resultado de la convergencia entre Africa y Eurasia. Sin embargo, los sectores occidental y oriental ... -
Control tectónico de las características sedimentológicas del sistema aluvial de Cobatillas (Provincia de Teruel)
(Sociedad Geológica de España, 1991)The Cobatillas alluvia/ system consists of two short superposed fans. The upper one shows wet fan facies within a semiarid climatic context. This is due both to the sediment source size, which is situated at the back of ... -
Correlación entre registros de sondeos y series de superficie del Aptiense-AIbiense continental del extremo SW de la Cuenca Vascocantábrica y su aplicación a la identificación de zonas lignitíferas
(Sociedad Geológica de España, 1991)Gamma-ray well logs of Aptian and Albian fluvial facies of Palencia, Cantabria and Burgos (SW Basque-Cantabrian Basin, N Spain), show serrated bell and funnel shaped patterns for the Utri/las Fm. and cylindrica/ shaped ... -
Correlación secuencial y sedimentológica entre registros de sondeos y series de superficie del Jurásico Marino de la Cuenca de Santander (Cantabria, Palencia y Burgos)
(Sociedad Geológica de España, 1991)A seismic scale cross-section of the Marine Jurassic of the Santander Basin (Lias and Dogger, western part ofthe Basque-Cantabrian Region, north Spain) is reconstructed based on both outcrop and well log data. It demostrates ... -
Criterios del sentido del movimiento e historia deformativa en fallas a partir de la Petrografía de espejos de fricción: Aplicación a fallas alpinas del Sistema Central
(Sociedad Geológica de España, 1991)The analysis of thin-sections using slickenside petrography (Lee & Means, 1990) a/lows the deduction ofa series of shear-sense indicators in brittle faults, such as: SC-type structures, asymmetric microfolds, stylolitized ... -
El deslizamiento de Riogordo (Málaga)
(Sociedad Geológica de España, 1991)On 12 January 1970 a large slide took place on the old main Malaga-Granada road, characte rized initially by a rock fall with rotational sliding at the main scarp, followed by a widespread gra- vitational flow. The ... -
Dinámica de construcción de un talud carbonatado: el ejemplo de Aldabide (Albiense inferior, Bizkaia)
(Sociedad Geológica de España, 1991)The Itxina carbonate platform displays a western reef-rimmed margin. Clinoforms up to 30-35 0 link this sha/low rim and basinal marls. Slope constructiona/ dynamics has been analyzed. Highstand slope progradation (offlap) ... -
Distribución de arcillas en la Unidad de Cuestas (Neógeno de la Cuenca del Duero)
(Sociedad Geológica de España, 1991)The spatial distribution of clay minerals in the Cuestas Unit is described in this work. Cartographic distribution of the different minerals points towards a tectonic control of the genetic environments, resulting in NE-SW ... -
Dolomitización y silicificación asociadas a los procesos de sustitución de carbonatos mareales y evaporitas «Sabkha». Tránsito entre las facies Muschelkalk y Keuper de las «Montañas de Prades» (Tarragona)
(Sociedad Geológica de España, 1991)Carbonate tidal platform and associated evaporite sabl<ha environments are recorded at the MuschelkaIk-Keuper transition in Prades (Coastal Ranges, NE Spain). The original carbonates as well as evaporites (anhydrite) were ... -
Edad y estructura de las rocas de Sierra Albarrana (SW dél Macizo Hespérico). Implicaciones regionales
(Sociedad Geológica de España, 1991)New structural and paleontological data prove that the rocks ofthe Sierra Albarrana area are of Lower Paleozoic age. Sierra Albarrana Quartzites probably correlates with the Lower Ordovician Quartzite of the Central Iberian ... -
Un ejemplo de paleocaverna con relleno calizo brechoide (Punta Arenillas, Albiense inferior, Cantabria)
(Sociedad Geológica de España, 1991)The Lower Albian pimacle platform of Arenillas in Castro-Urdiales (Cantabria, northern Spain) shows a paleocavern about 120 m long and 40 m high, whose base is 60 m below an unconformity. This vadose structure is infilled ...
