Geogaceta -- Nº 56, (2014)

Permanent URI for this collectionhttps://hdl.handle.net/10272/10608

Browse

Now showing 1 - 20 of 33

In memoriam Andrés Pérez Estaún (1947-2014)
(Sociedad Geológica de España, 2014) Vera, J. A.
Nuevo hallazgo de restos de proboscídeo en depósitos fluviales afectados por procesos kársticos. Pleistoceno inferior de la Cuenca del Ebro, Zuera (Zaragoza)
(Sociedad Geológica de España, 2014) Marazuela Calvo, Miguel Ángel; Azanza, Beatriz; Soriano, María Asunción; Luzón, Aránzazu; Pérez García, Antonio; Gil, Héctor
A partial tusk of Elephantidae indet. was recently discovered in Early Pleistocene gravel deposits belonging to a terrace of the Gállego River, near to Zuera village. Stratigraphic studies have allowed four sedimentary units to be differentiated, named (from base to top) U1 to U4. The whole succession is 35 m thick; the tusk remains were collected at the top of unit U1. Preliminary report on the taphonomy suggests that this specimen could be a reworked fossil. Evaporite dissolution related with karst processes caused deformation structures in the overlying Quaternary deposits. Synform and tubular shapes (delimited by faults) were generated. Karstification favoured the preservation of the fossil remains
Análisis paleoambiental de una sección del Plioceno Inferior en la Cuenca de Águilas (Cordillera Bética oriental)
(Sociedad Geológica de España, 2014) García Ramos, Diego; Corbí, Hugo; Soria, Jesús M.
The Barcelón section, located at the inner sector of the Águilas Arc (Eastern Betic Cordillera), records the Pliocene reflooding. This section comprises a basal unit A, made up of conglomerates, overlain by unit B, consisting of silty marls and glauconitic sandstones. Ichnological traits sculptured over blocks of unit A are attributable to the Entobia ichnofacies, and suggest a rapid transgression. In unit B three benthic foraminiferal assemblages are recognized: an assemblage I, related to epibathyal settings, followed by a circalittoral one, II, and finally, an infralittoral assemblage, III. Overall features point to eutrophic conditions, environmental stress at the bottom, and events of high energy bottom-currents
Identificación de varios taxones de quelonios en el Vallesiense (Mioceno superior) de Arévalo (Ávila, Cuenca del Duero, España)
(Sociedad Geológica de España, 2014) Murelaga, Xabier; Pérez García, Adán
In this paper we identified the presence of two taxa of turtles so far not mentioned in the known paleontological area of Arévalo (Ávila). This region was known from the first half of the twentieth century by its findings in fossil turtles. Some specimens of giant tortoises were identified there. However, no other taxon of turtles has been, until now, described in Arévalo. The association of the three taxa recognized here is very common in the Cenozoic continental deposits of the Iberian Peninsula
Estudio preliminar de los ostrácodos del yacimiento del Eoceno inferior de Loza (Álava, Cuenca Vasco-Cantábrica)
(Sociedad Geológica de España, 2014) Suárez Bilbao, Aitziber; Suárez Hernando, Oier; Martínez García, Blanca; Zuluaga, María Cruz; Apraiz, A.; Baceta, Juan Ignacio; Murelaga, Xabier
In this paper the preliminary study of ostracods preserved in a distinct fossiliferous level within the poorly-known lower Eocene lacustrine-palustrine succession of Loza (Álava, Basque-Cantabrian Basin) is developed. The studied level is a 28cm thick marly interval including a thin whitish chalky level, interbedded between fine-grained limestones with variable proportions of gastropods and characean remains.With the aim of knowing the richnes of the ostracods and the prevailing palaeoenvironmental conditions during deposition of the lacustrine succession, two samples (L1 and L2), located within the marly interval respectively below and above the chalky level, have been studied. In L1 the most abundant genus is Limnocythere Brady, while in L2 the principal genera are Limnocythere and Cyclocypris Brady and Norman. According to the successive change in the ostracods, the fossiliferous level was deposited in a lacustrine environment,which was more saline and, probably, restricted over time
Braquiópodos del Jurásico Inferior del norte de España en la colección Jiménez de Cisneros
(Sociedad Geológica de España, 2014) Baeza Carratalá, José Francisco; García Joral, Fernando; Goy, Antonio; Tent Manclús, José Enrique
Early Jurassic brachiopods from several localities in North and Northeast Spain housed in the Jiménez de Cisneros historical collection have been updated.These specimens have been referred to nowadays widely recognized geological settings in the Iberian Peninsula, thus providing a lithological and cronostratigraphical context. As a results of this updating, eighteen species were identified derived from the Castilian and Aragonese branches of the Iberian Range as well as Asturias, Pyrenees and the Coastal Catalan Range. These species are dated in the Sinemurian-earliest Aalenian timespan and they have been paleobiogeographically settled and compared within the platforms system existing in the Early Jurassic Iberian paleomargins
Otozoum trackway in Issil-n-Aït Arbi (Lower Jurassic, Central High Atlas, Morocco)
(Sociedad Geológica de España, 2014) Masrour, Moussa; Pérez Lorente, Félix
A new site has been found in the Central HighAtlas, in the Issil-n-Aït Arbi near the Dadés Gorges. This paper is the first study presented of this locality, with the description of a quadruped trackway of pentadactyl pes and tridactyl manus, which we have attributed to Otozoum. The characters of these prints and trackway are described, compared, and analyzed in the text and they are attributed to a prosauropod trackmaker. Some anatomical considerations are deduced from this type of trackway. It is the first track of this ichnogenus cited in north of Africa, though it is possible other similar ones exist in Lesotho
Precisión cronoestratigráfica y sedimentológica del yacimiento icnológico triásico en facies Buntsandstein de Bejís (Castellón, SE de la Cordillera Ibérica)
(Sociedad Geológica de España, 2014) Santos Cubedo, Andrés; Santisteban, Carlos de; Poza, Begoña
The oldest tetrapod footprints of the Valencian Community described up to date are located in the Cañizar Formation (Desierto de las Palmas, Castellón). Most recent are those found in the village of Bejís (Castellón). The present stratigraphic review has allowed to place the paleontological site from Bejís in the Porta Coeli shales Member (Tb33), belonging to the upper part of the Serra shales and sandstones Formation (Tb3) and therefore to specify the age of the ichnites as Pelsonian (Anisian,Middle Triassic). It has been shown that the fossils are located in a particular type of facies (B facies), formed by a set of tabular layers of red sandstones and siltstones (locally clays), which are characteristic of flood plain river deposits
Contaminantes orgánicos (PAHs) derivados de la escombrera de la Central Térmica de Aliaga (Teruel)
(Sociedad Geológica de España, 2014) Sánchez Palencia, Yolanda; Ortiz, José Eugenio; Torres, Trinidad de; Díaz Bautista, A.; Lizarraga, Serafín
The aim of this study was to determine if the soils, waters and plants from the Aliaga dump contained polycyclic aromatic hydrocarbons (PAHs) and their quantification.The results showed that PAHs concentrations in soils are in general higher than the reference levels from the Spanish legislation. Waters and plants contained PAHs but in low concentrations. The possible actions for remediation (photodegradation and bioremediation) seem to be unviable here because of the large volume of materials involved, although its use as an additive for the cement industry and derivatives can be considered. It is proposed that fluorantene in waters, and phenanthrene and benzo[ghi]perilene in soils be considered as pollutants as well as to study the incorporation of PAHs to plants
Caracterización de la composición química del río Guadiana y su influencia en el Parque Nacional de Las Tablas de Daimiel
(Sociedad Geológica de España, 2014) Castaño Castaño, Silvino; Losa Román, Almudena de la; Martínez Santos, Pedro; Mediavilla López, Rosa; Santisteban, Juan Ignacio
Since autumn 2012, groundwater has become a water input to Las Tablas de Daimiel National Park through discharge to the river Guadiana.This fact reflects the "quasi-natural" situation that has been achieved so far in the park.The monitoring of the chemical quality of the river water and nearby points has been carried out during the period December 2012 to September 2013 through seasonal sampling. The results obtained from the data of major components have shown that the arrival of water from the Guadiana has significantly changed the composition of water in the National Park inlet. However, although there have been discharges from springs in the Guadiana, the chemical composition of water provided by the Azuer river are more dominant character, being reflected the physico-chemical characteristics of these waters in the waters of the Park. On the other hand, groundwater near Guadiana shows significant heterogeneity in chemical composition and in its temporal evolution
Propagación de la recarga inducida por una crecida del río Ebro en el acuífero aluvial urbano de Zaragoza (España)
(Sociedad Geológica de España, 2014) García Gil, Alejandro; Sánchez Navarro, José Ángel; Garrido Schneider, Eduardo; Vazquez Suñé, Enric; Pérez García, Antonio; Sampietro Lardiés, Diego; Mateo Lázaro, Jesús
This paper studies the recharge induced by a flood event in the alluvial urban aquifer of Zaragoza from a quantitative point of view. Thanks to the implementation of a groundwater flow numerical model, the propagation of the recharge front through the alluvial aquifer has been simulated. The results obtained have shown a propagation of the recharge front through the aquifer driven by the transmissivity field and the existent river-aquifer regime prior to the flood event. In general, the recharge front has a 35-45 m·h-1 displacement in the first 20 hours. Subsequently, the front decelerates to almost zero velocity at the flood peak. Finally, it is concluded that the recharge front reaches 1,000 m in previous river effluent zones and 2,000- 2,500 m in other zones
Efecto del cambio climático en la recarga del acuífero del Ventós (Alicante)
(Sociedad Geológica de España, 2014) Touhami, Issam; Chirino, Esteban; Andreu Rodes, José Miguel; Sánchez, Juan Rafael; Pulido Bosch, Antonio; García Sánchez, Ernesto; Bellot, Juan
Predictions of climate change have a high interest in regions like the province of Alicante whose economy is largely based on groundwater. It is expected that the decrease of precipitation and the increase of temperature according to climate change forecasts, could impact on the recharge to aquifers. In this context, the aim of this study was explore the possible impact of climate changes forecasts on recharge in a small aquifer. In order to achieve it downscaling techniques have been used from the HadCM3 Global Climate Model.Air temperature and precipitation data in two climate change scenarios, B2 and A2 have been estimated. These databases have been coupled to HYDROBAL a hydrological model, to determine the soil water balance. Results have showed increase of 4º C of temperature and decrease of 10% precipitation in both scenarios at the end century. The hydrological model shows a negative water balance in relation to baseline period (1961- 1990), being the higher differences with the A2 scenario. It could produce an important impact on the recharge of the Ventós aquifer, but it must be checked in future studies
Caracterización de los depósitos miocenos de la isla de Nueva Tabarca (Alicante) y su empleo como material de construcción en el patrimonio local
(Sociedad Geológica de España, 2014) Martínez Martínez, Javier; Giannetti, Alice; Peral Lozano, Juan; Corbí, Hugo; Cuevas González, Jaime
The aims of the present work are: i) the description of the Miocene deposits cropping out in the Nueva Tabarca island; ii) the characterization of the use of these rocks in the local heritage; and iii) the analysis of the rock behaviour during weathering processes. The Miocene stratigraphic succession can be divided into three parts. The first one shows dolomite-rich sandstones interbedded to biocalcarenites rich in corals, red algae, thick-shelled bivalves and clypeasteroids. The second part corresponds to cross-laminated calcirudites whose top is represented by a condensed level rich in large bioclasts and rhodolites, passing upward to fine-grained sandstones. The third part begins with several hardened levels of sandstones followed by fine-grained parallel-laminated sandstones. Ancient quarries were located at every level of the stratigraphic series. Consequently, every lithofacies are observed in the current ashlars of the monuments. These rocks are easily decayed by means of granular disintegration, flakes and/or alveolar weathering
Petrología y geoquímica del Edificio Antiguo de la isla de Santa Luzia (archipiélago de Cabo Verde)
(Sociedad Geológica de España, 2014) Alonso Cótchico, Mar; Huertas, María José; Ancochea, Eumenio
Santa Luzia island is essentially formed by erosional remnants of, at least, one volcanic edifice: the Old Edifice. The remains of this edifice are now a NW-SE trending mountain range. It is a fisural edifice that follows this trend and is formed by hundreds of meters of aa-type lava flows crosscut by dikes. Lithologic compositions are basic and ultrabasic (picrobasalts, basanites, basalts and trachybasalts), intermediate (trachyandesites) and felsic (trachytes and phonolites). The main process generating these compositional differences is fractional crystallization
Los travertinos de Baños de Mula (Murcia). Una roca de interés sedimentológico y arqueológico
(Sociedad Geológica de España, 2014) García del Cura, María Angeles; Benavente, David; Martínez Martínez, Javier; Ordóñez, Salvador
The coloured travertine of the Baños de Mula,were used as dimensional stone among other sites in the Roman Theatre in Cartagena (Red Mula Travertine). This rock has good mechanical properties and water behavior. These properties show strong anisotropy related to the characteristic bedding planes visually defined by changes in the color intensity and pore distribution. Their textural features show the prevalence of layers consisting of fibrous and fibrous-radiated crystals with a late stage cementing Fe oxyhydroxides and micritic aggregates following colonial bacterial morphologies. Both features may be related to bacterial activity. All these data point in favor of a genesis related upwelling of thermal waters. These hydrothermal processes are connected with hydrothermal circulation along the active faults, and are manifested at present in the hot springs of Baños de Mula
Petrología y geoquímica de las tonalitas de Villarejo de Montalbán (Toledo)
(Sociedad Geológica de España, 2014) Errandonea Martín, Jon; Orejana, David; Villaseca, Carlos
The tonalites of Villarejo de Montalbán are biotite-rich rocks showing felsic segregates with abundant titanite. Whole-rock geochemical and isotopic data ((87Sr/86Sr)300 = 0.7084-0.7089; εNd = -4.79, -4.80) suggest that the tonalitic magma was formed by melting of metaigneous rocks of basic/intermediate composition (amphibolites or granulites). At the same time, the felsic segregates seem to have formed through the accumulation of a differentiated residual magma after crystal fractionation of plagioclase and biotite. Crystallization conditions estimated according to amphibole geothermobarometry indicate temperatures between 890 and 920ºC, and pressures in the range 1.3-2.4 kbar, which is in accordance with an approximate emplacement level close to 5-10 km deep
Composición isotópica (δ13C, δ18O y δD) de perfiles mixtos de calcretas-silcretas: significado paleoambiental (Mioceno, área de Torrijos, Cuenca de Madrid)
(Sociedad Geológica de España, 2014) Bustillo Revuelta, María Ángeles; Alonso Zarza, Ana María; Plet, Chloé
In this paper the isotopic stable isotopes of three calcrete-silcrete profiles are studied. The profiles correspond to the top of the Lower Miocene Unit of the SE Madrid basin and developed on fine-grained detrital deposits formed in distal alluvial fan systems. δ13CPDB and δ18OPDB analyses were carried on the carbonate samples (calcite), whereas δ18OSMOW and δDSMOW, were analyzed in the silica minerals (quartz, opal and moganite). The results indicate that the calcrete-silcrete profiles formed by the influence of meteoric percolating waters. The values obtained in the calcretes indicate meteoric waters, slightly modified, and a great influence of vegetation, especially C3 plants, in the precipitation of soil carbonate. The water responsible for silcrete formation was very similar in the three studied profiles. δ18O and δ D ratios do not fit the global meteoric water line, probably due to evaporation. Most of silicification processes were from groundwaters of δ18OSMOW values between -6 and -8‰. However, the very early silicification processes, localized in roots, were produced in microenvironments with slightly more evaporated waters (between -4 and -6 ‰) due probably to evapotranspiration
Primeros resultados de monitorización de la Cueva de El Recuenco (Ejulve, Teruel)
(Sociedad Geológica de España, 2014) Pérez Mejías, Carlos; Sancho, Carlos; Moreno Caballud, Ana; Bartolomé, Miguel; Oliva Urcia, Belén; Delgado Huertas, Antonio; Cacho, Isabel; Auqué Sánz, Luis; Osácar, María Cinta
El Recuenco Cave (Ejulve, Teruel, NE Spain) is developed with a complex topography in Upper Cretaceous dolomitic limestones. A monitoring survey is in progress in the cave (covering now the 1st semester of 2013) in order to know the isotopic path from rainfall to dripwater and in-situ farmed calcite. Rainfall results show that δ18O values reveal a clear seasonality (-12,73‰V-SMOW in winter, -8,94‰V-SMOW in spring). Dripwater values are mainly influenced by homogenization processes in the epikarst and also reveals seasonality in δ18O values (-10,9‰ V-SMOW in winter, -9,8‰ V-SMOW in spring). Finally, isotopic values of in-situ farmed calcite confirm this seasonality pattern (in δ18O values, -8,17‰ PDB in winter, -8,11‰ PDB in spring; also in δ13C values, -9,84‰ PDB in winter, -9,68‰ PDB in spring). Nonetheless, new monitoring tasks are needed to confirm this preliminary pattern. These conclusions will help to better interpret of speleothem records in this cave for paleoclimatic reconstructions
Uso de Sistemas de Información Geográfica para el cálculo del volumen de los materiales emitidos en la erupción de 1971 del volcán Teneguía (La Palma, Islas Canarias)
(Sociedad Geológica de España, 2014) López Acevedo, Francisco Javier; Pellicer Bautista, María José
Geographic Information Systems (GIS) are becoming day to day an essential tool in the field of Geology. To show its potential, we have used a three-dimensional spatial analysis in ArcGIS 10.0 from triangulated irregular networks (TIN) formed by topographies for the volcano Teneguía (La Palma, Canary Islands) before and after its eruption in 1971. The purpose of the study is to calculate the surface eruptive volume, discuss the measures carried out after the eruption in 1974, and try to get a more accurate volumetric result
Estratigrafía y quimioestratigrafía del Valanginiense (pro parte) de Loma Solana, Sierra de Quípar (Subbético Externo, Cehegín, Murcia)
(Sociedad Geológica de España, 2014) Company, M.; Aguado, Roque; Castro Jiménez, José Manuel; Gea, Ginés A. de; Molina, José Miguel; Nieto, Luis M.; Ruiz Ortiz, Pedro Alejandro
The stratigraphy, biostratigraphy and geochemistry (C stable isotopes and RSTE trace elements) of a succession of Valanginian age outcropping in Loma Solana (External Subbetic) is presented. The succession is composed of two local sections, one cropping out to the west of Cehegín (Murcia) and another in the Garranchal gorge, to the SSW of this locality. The lithology consists of marl and marlstone rhythmically interbedded, which is typical of the Carretero Fm of the Subbetic. The ammonite zones and subzones of the middle- late early Valanginian and the complete late Valanginian, except for the lattermost part, have been identified, without any evidence of stratigraphic discontinuity between the two local sections. The δ13C curve show a similar shape to those of the same age obtained in other basins and the positive excursion of the δ13C characterizing the Weissert episode of environmental change (EECWeissert) has been identified. The RSTE, redox sensitive trace elements, analyzed do not show any particular increase as is typical of anoxic events and consequently conclude that anoxia due not exist in this part of the Subbetic basin during this EEC

Browse

Recent Submissions