Los sistemas lacustres evaporíticos del sector Navarro-Riojano de la Cuenca del Ebro durante el Oligoceno y Mioceno inferior

La sucesión de depósitos continentales en el sector occidental de la Cuenca del Ebro durante el Oligoceno y Mioceno inferior muestra el registro de cuatro unidades lacustres evaporíticos conocidos con los nombres de Puente La Reina, Falces, Lerin y Monteagudo- Grávalos-Ribafrecha, resultantes del desarrollo de sistemas lacustres vaporíticos de tipo playa-lake con  precipitación principalmente de yeso, anhidrita, halita y con ciertas particularidades en cada caso. Las evaporitas señalan en los tres primeros casos el depocentro de la cuenca y estin rodeadas por sistemas aluviales y fluviales procedentes de la erosión de las cordilleras pirenaica e ibérica. El sistema evaporitico de Monteagudo-Grávalos-Ribafrecha se desarrolló, por el contrario, en el margen sur de la cuenca. La posición progresivamente mis meridional de estas evaporitas en la cuenca conforme su edad es más moderna, refleja el desplazamiento del eje de la cuenca en esta misma dirección como resultado del levantamiento dominante de los Pirineos

The Neogene and Quaternary deposits of the Barcelona city through the high-speed train line

A total of 208 boreholes with continuous core sampling, drilled for the construction of the high-speed train line through the city of Barcelona and other nearby infrastructures, were studied. The correlation of the lithologic logs of these boreholes allows identifying five main depositional sequences bounded by sharp erosional surfaces: i) lower Miocene, of alluvial origin; ii) middle Miocene, of deltaic-lacustrine origin; iii) lower Pliocene, of beach-shelf origin; iv) Pleistocene, of alluvial origin and v) Holocene, of deltaic origin. The erosive surfaces that separate thesesequences represent important erosive hiatus linked to prolonged sea level falls at regional scale, which eliminated the upper part of each one. Sedimentation took place during decreasing intensity of extensional tectonic activity that mainly affected the Miocene deposits. The Plio-Quaternary units show their original structure apparently without tectonic alterations. Some new biostratigraphic data based on foraminifer assemblages allowed making accurate estimate of the age of the deposits

Scientific drilling in the campus: Almera-1 borehole, unraveling urban subsurface geology in Barcelona (Spain).

Almera-1 borehole was drilled to provide a borehole geophysical logging and downhole monitoring research and training facility. Also a main objective was the exploration of the urban subsurface geology adjacent to the Institute of Earth Sciences Jaume Almera (CSIC) in Barcelona the University of Barcelona Pedralbes. Wireline drilling continuous coring was successfully applied to recover cores from the entire section (214m). Since 2011 Almera-1 hole has been extensively used for slim hole logging, coring and monitoring. Total depth was reached after drilling a Quaternary to Paleozoic section. The upper section of Almera-1 hole is cased with PVC and the lowermost is an open hole section within the Paleozoic section. A complete set of geophysical logging measurements and oriented borehole images was acquired with CSIC own slim hole logging equipment both in open hole mode and through the PVC casing. Logging measurements were acquired over the entire section. Open hole measurements included acoustic and optical imaging, spectral natural gamma ray, full wave acoustic logging, magnetic susceptibility, hydrochemical-temperature logs and fluid sampling. Through casing (PVC casing) measurements included spectral gamma ray logging, full wave sonic and acoustic televiewerPeer Reviewe

Cronoestratigrafía (Palinología) del Triásico Sudpirenaico y del Pirineo Vasco-Cantábrico

This paper presients a general chronostratigraphy of the south Pyrenean Triassic basi:d on palynological studies. The Triassic in Les Nogueres-Cadí and the Basque Country areas is divided into the Buntsandstein, Muschelkalk and Keuper facies and the Isábena Forrnation. The Conglomeratic, sandstone and lutitic Unit of the Buntsandstein in the Puerto dr Otxondo (Basque Country) presents Stellapollenites thiergartii and together with the absence of Praecirculina granifer, suggests a Lower-middle Anisian age. The Lutitic Unit of the Buntsandstein in Igüem, Sant Sebastia de Buseu and Baga (Les Nogueres-Cadí) presenits Illinites kosankeii and Stellapollenites thiergartii, and the absence of Praecirculina granifer, indicates a Lower Anisian age. The Muschelkailk in Hostalets (Les Nogueres) presents Camerosporites secatus, suggesting an upper Ladinian age. The transit zone between the Muschelkaik and the Keuper facies in Odkn (Cadí) shows a palynological assemblage with Patinasporites densus, Partitisporites quadruplicis and Staurosaccites quadrifidus, indicating a Camain age, possibly Middie-upper Camian. The lower part of the Keuper in Noguera de Tor and Adons, in the Les Nogueres area, presents a palynological assemblage with Classopollis, Granuloperculatipollis rudis, Ovalipollis ovalis, Praecirculina granifer and Triadispora. The abundance of Classopollis and the presence of Granul~p~erculatipollrius dis suggest a Norian age, possibly lower-middle. The upper part of the Keuper in La Nou (Pedraforca) is Rhaetian in age due to the presence of cf. Deltaidospora and cf. Taeniasporites. The base of tlie Isábena Formation in Noves de Segre presents Corollina zwolinskae and Cerebropollenites pseudomassulae, indicating a Rhaetian age. The palynological studies, together with the forarninifera and conodonta data, deteimine the existence of important stratigraphicc hiatuses in the south Pyrenean Triassic supercycle

Nuevos datos cronoestratigráficos de la Fm. Marismas (Bajo Guadalquivir)

La Formación Marismas forma la parte superior del relleno sedimentario del sector SW de la cuenca del Guadalquivir. Los datos previos sobre el sondeo Lebrija, indicaban que la parte más alta de esta formación tenía edades de hasta 9.6 kyr BP y en la parte inferior eran cercanas o fuera del rango del radiocarbono, pero posterior a la reversión Brunhes-Matuyama. En este trabajo se aportan 17 nuevas dataciones realizadas mediante racemización de aminoácidos en valvas de ostrácodos en este mismo sondeo, con el fin de completar la cronología y el modelo de edad de la parte superior e inferior de la Fm Marismas. El resultado indica que el tramo situado por debajo del metro 56, arroja edades que oscilan entre 164685±14110 y 202830±30255, que se correlacionan con los estadios isotópicos marinos MIS 6-7 del Pleistoceno medio, edad sensiblemente más baja a las inferidas para esta formación en otros puntos de la Cuenca del bajo Guadalquivir. Abstract: The Marismas Formation is the upper part of the sedimentary infill of the SW sector of the Guadalquivir basin. Previous chronological data of the Lebrija core sediments, indicated that the age at the top of this formation was 9.6 kyr BP and the bottom, 60 m, is near or beyond the range of radiocarbon, but post Matuyama - Brunhes reversal. In this work we present 17 new ages coming from the analysis of racemization of amino acid on valves of ostracods, in order to complete the chronology and the age-depth model of the Marismas Formation. The results indicates that the section located below the meter 56, throws ages ranging between 164685±14110 and 202830±30255, which correlates with the marine isotope stage MIS6-7 Middle Pleistocene, significantly lower in age than described in other parts of the lower Guadalquivir basi

The Neogene and Quaternary deposits of the Barcelona city through the high-speed train line

A total of 208 boreholes with continuous core sampling, drilled for the construction of the high-speed train line through the city of Barcelona and other nearby infrastructures, were studied. The correlation of the lithologic logs of these boreholes allows identifying five main depositional sequences bounded by sharp erosional surfaces: i) lower Miocene, of alluvial origin; ii) middle Miocene, of deltaic-lacustrine origin; iii) lower Pliocene, of beach-shelf origin; iv) Pleistocene, of alluvial origin and v) Holocene, of deltaic origin. The erosive surfaces that separate these sequences represent important erosive hiatus linked to prolonged sea level falls at regional scale, which eliminated the upper part of each one. Sedimentation took place during decreasing intensity of extensional tectonic activity that mainly affected the Miocene deposits. The Plio-Quaternary units show their original structure apparently without tectonic alterations. Some new biostratigraphic data based on foraminifer assemblages allowed making accurate estimate of the age of the deposits.Agencia de Gestio D'Ajuts Universitaris de Recerca Agaur (AGAUR) 2017-SGR824Gobierno de España, Administrador de Infraestructuras FerroviariasGobierno de EspañaGestio d'Infraestructures SA (GISA)Universitat Politecnica de Catalunya (UPC)Agencia de Gestio D'Ajuts Universitaris de Recerca Agaur (AGAUR) 2017-SGR82

Geología e hisrogeología de la zona endorreica de Bujaraloz-Sástago (Los Monegros, provincias de Zaragoza y Huesca)

The closed-basin area of Bujaraloz-Sástago has a tabular relief and lies on upper-Oligocene and lower-Miocene detritic, gypsiferous and carbonatic deposits. The area contains a large number of small salt lakes which in most cases are related to groundwater discharge. Six distinct stratigraphic units can be distinguished in the sequence: 1) Basal Detrital Unit, 2) Lower Carbonatic Unit, 3) Middle Detrital Unit, 4) Middle Gypsiferous Unit, 5) Upper Detrital Unit, and 6) Upper Gypsiferous Unit.All these materials have a low permeability and contain high salinity groundwaters. In the area of study, two shallow aquifers can be distinguished. The Lower Aquifer is located on the limestone-gypsum sequence of the Middle Gypsiferous Unit. At the southem part of the study area, this aquifer is a water table aquifer in which groundwater discharge takes place mostly at the salt lakes. At the northem limit, it is confined by the Upper Detrital Unit which separates the Bottom Aquifer from an upper water table aquifer located on the Upper Gypsiferous Unit. In this Upper Aquifer groundwater flows from  southwest to northeast and discharges at the lakes and creeks close to Bujaraloz

Structural Relationship Between Piton des Neiges and Piton de la Fournaise Volcanoes : New K-Ar Data and Geomorphological Study of the Takamaka Region (East Reunion Island, Indian Ocean)

International audienc

Unraveling the Hydrological Behavior of a Coastal Pond in Doñana National Park (Southwest Spain)

Time series analysis methods have been used to detect behavioral patterns in a set of nine time series. These series contained information in a 3-hour time step about meteorological, hydrological and tidal data of a sand dune pond area located in Doñana National Park in the southwest of Spain. The methods used, such as wavelet analysis and additive seasonal decomposition, had never been applied before in the types of ecosystems studied. These approaches have improved the current knowledge of the conceptual model of the Santa Olalla pond system, the only system with a permanent hydroperiod located in this protected area. In addition, complex surface water–groundwater interactions, not visible through descriptive methods, have been distinguished to have a strong seasonal component. Finally, we evaluated the effect of pumping activity in a nearby coastal resort on the water supply of the Santa Olalla pond system. Although direct damage to this sand dune pond has not yet been identified, special attention must be paid in order to maintain groundwater inputs that are integral to maintaining its current status.Departamento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, EspañaÁrea de Geología Ambiental y Geomatemáticas, Instituto Geológico y Minero de España, Españ