Geogaceta -- Nº 03, (1987)
Permanent URI for this collectionhttps://hdl.handle.net/10272/18211
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Item type: Item , Tectónica de bloques en el SE de España: aplicación de la teledetección a un límite de placas de tipo intracontinental(Sociedad Geológica de España, 1987) Vegas, Ramón; Barranco, L. M.; Vázquez Garrido, Juan TomásThe fracture pattern in Southeastern Spain can be explained in terms of block tectonics. A detailed analysis of satellite images leads to define the main fracture zones and domains as well as the internal crustal blocks. The kynematic model derived from this analysis can account for the seismic pattern, the neotectonics and the geodynamics of the complex Africa-Eurasia plate boundaryItem type: Item , Sedimentación marina somera en el carbonífero de la zona sur-portuguesa(Sociedad Geológica de España, 1987) Moreno Garrido, María CarmenSedimentary secuences deposited in shallow marine shelves appear, locally, in the «Culm facies» of the South-Portuguese Zone. These siliciclastic shelves were developped in relation with erosion of volcanic elevationsItem type: Item , Orientaciones de las estructuras de plegamiento en un sector de la Cordillera Ibérica(Sociedad Geológica de España, 1987) Rivas Ponce, A.In the area dealt with here, the large folds show different directions that may be grouped into two main sets: the most important correspond to the called "Iberian directions», around 130º E, and the second to the «Guadarrama or Betic direction», about 45º. Both types of folds show on the map sigmoidal patterns. Additionally some other directions appear: EW and N-S; the first trend is here interpreted as a flexure of the Iberian folds; in a similar way some of the second trend structures would represent a flexure of the Guadarrama folds (some of these folds directions would be independent, as the Altomira trend). At the large scale an areal distribution of the fold sets merge out, with the Iberian one superimposed along wide bands on the Guadarrama ones. However at smaller scale, all directions may be found within each area in matter the dominant direction of the macrostructuresItem type: Item , Nuevos datos sobre los macromamíferos turolienses de Crevillente (Alicante)(Sociedad Geológica de España, 1987) Alcalá, Luis; Azanza, Beatriz; Cerdeño, Esperanza; Iñesta, M.; Juan, R.New finds of large mammal fossils in Crevillente-2 (Alicante) increase the diversity of Lower Turolian macromammals in Spain. The site is equivalent in age to Piera (Vallés Penedés, Catalonia) whose faunal remains have been so far the base for the knowledge of Spanish Lower Turolian large mammals. Main similarities between Crevillente-2 and Piera are in the presence of the same species of Plioviverrops, Hipparion, Dicerorhinus, Microstonyx, Birgerbohlinia and Tragoportax. The proboscidean abondance, the absence of Aceratherium, the different carnivore faunal association, the presence of a second giraffid and the cervids, in Crevillente, mark the differences with the catalonian siteItem type: Item , Medida de la deformación de pliegues en el extremo oriental del Sistema Central español(Sociedad Geológica de España, 1987) González Casado, J. M.; Fernández Rodríguez, C.We propose an areal distribution for the second phase hercynian folds in the eastermost part of the Spanish Central System, based on their morphological charactheristics. The analysis of these data allows us to calculate the shortening and the flattening respónsable for the Hercynian second phaseItem type: Item , Los roedores del yacimiento musteriense de la Cueva de Gabasa (Pirineo Aragonés), Interés paleoecológico(Sociedad Geológica de España, 1987) Gil Bazán, E.; Lanchares, E.The rodents of the Mousterian site Cueva de Gabasa (province of Huesca) have been studied in this report. The stratigraphical distribution of rodents has a paleoecological meaning in the karstic siteItem type: Item , La subsidencia tectónica en la Cordillera Ibérica durante el Mesozoico(Sociedad Geológica de España, 1987) Alvaro López, M.The subsidence trajectories are built with two localities data from the Iberian Chain. Both curves show two rifting-tectonic subsidence cycles. The first one (Triassic-Jurassic) belongs to the development of the Celtiberian Aulacogen, in relationship with the BeticBalearic passive margin (Western Tethys). The second cycle occurred in Cretaceous times, and it was conditioned by the Iberian Plate anti-clockwise drifting and Bay of Biscay openning. The stretching rates were Iow to moderate: 1.12 and 1.26.Item type: Item , Las rocas volcánicas neógenas de Nuévalos (provincia de Zaragoza)(Sociedad Geológica de España, 1987) Ancochea, Eumenio; Sagredo, J.; Muñoz, MercedesOn the basis of petrological data, the ultra-alkaline character of the volcanics from Nuévalos is clearly pointed out. This character rejects any type of relationship with Permian and Mesozoic volcanic events. Furthermore, analogies with plio-quaternary volcanics from Cofrentes suggest a similar episode related to a tensional regime that can be linked to the openning of the Valencia gulf. The volcanics are massive and look a porphyritic crystalline texture. Mineralogical composition define them as olivine-nephelinite rocks. They have a large amount of xenocrysts from mantle spinel-peridotite. The high xenocryst accumulation percentage has modified the original character of the primary melt The whole geochemical data suggest a parental magma derived by a very Iow degree of melting (4,3%) from a peridotitic mande source, strongly enriched in incompatible elements, and from a depth near to 700 km.Item type: Item , La sedimentación oolítica del Dogger de Mallorca: Un modelo de bajada carbonática de pie de talud retrogradacional(Sociedad Geológica de España, 1987) Barnolas, Antonio; Simo, A.The oolitic succession of Middle Jurassic in age of Malorca Island is interpreted as a retrogradational base-of-slope carbonate apron sequence. The stratigraphic sequence shows oolite megabeds, oolite turbidites and hemipelagitesItem type: Item , Fósiles ordovícicos del NO de Adamuz (Córdoba): aportación paleobiogeográfica a la concepción del límite entre las Zonas Centroibérica y Ossa Morena durante el Paleozoico(Sociedad Geológica de España, 1987) Gutiérrez Marco, Juan Carlos; Apalategui, Octavio; Rábano, IsabelThe Ordovician outcrop at NW Adamuz (Córdoba province), previously regarded as belonging to in the Ossa Morena Zone by some authors, contains several fossiliferous levels of Lower Llanvirn, Upper Llanvirn-Llandeilo and Caradoc (pre-Actonian) age. The Central Iberian affinities of the faunas constitute an additional argument for the consideration of the Obejo-Valsequillo-Puebla de la Reina Domain as the southern margin of the Central Iberian Zone during the PaleozoicItem type: Item , Estructuración del basamento mesozoico en Los Llanos de Albacete(Sociedad Geológica de España, 1987) Aracil Ávila, E.; Vilas, LorenzoThe Mesozoic basement of Los Llanos de Albacete Tertiary Basin shows a fracture grid with two main orientations, almost orthogonal: NE-SW orientation is preferential, causing the basement to be divided in several blocks, limited by lystric faults and divided in smaller structures tilted to the NE. The Neogene filling of the basin is not affected by these faults. The results have been obtained during the study of several wellsItem type: Item , El sentido de desplazamiento de los Mantos Nevado-Filábrides(Sociedad Geológica de España, 1987) García Dueñas, V.; Martínez Martínez, J. M.; Orozco, Miguel; Martín Ramos, D.The Veleta Unit and the Mulhacen nappe Group (Calar Alto and Bédar-Macael Nap pes) make up the Nevado-Filábride Complex. The westward movement of the both nappes occurred along NW to WSW trajectories. In the Sierra Nevada, the nappe pile is strongly thinnedItem type: Item , Comments on the Cambrian biogeography of Spain(Sociedad Geológica de España, 1987) Gil Cid, M. D.; Gutiérrez Marco, Juan Carlos; Rábano, IsabelThe Cambrian faunas recorded in the different areas of the Hesperian Massif do not support evidences of a marked biogeographical differentiation in the Iberian Peninsula throughout this Period. The vertical variations shown by the trilobite and archaeocyathid associations are related to more global factors as are a certain climatic uniformity, the proximity of the Gondwanan continent and the opening of a Mideuropean OceanItem type: Item , Características del metamorfismo hidrotermal del Complejo Plutónico de la Caldera de Taburiente (La Palma, Canarias)1987(Sociedad Geológica de España, 1987) Arenas, R.; Nuez, J. de laThe Plutonic Complex cropping out in the Caldera de Taburiente is affected by a marked hydrothermal metamorphism, whose metamorphic peak conditions were reached in the upper-T part of the greenschist facies. A later retrogradation to the zeolite facies is related with the uplift of the ensemble from the ocean floor to the surface