15 research outputs found
Petrophysical properties in the Iberian Range and surrounding areas (NE Spain): 1-density
We introduce the first map of density data in Northeastern Spain which can help in the interpretation of gravimetric surveying. The background map is a simplified version of the Geode continuous geological cartography (scale 1:200.000) of the Iberian Range and Ebro basin. These maps are synthetic and homogeneous maps based on previous 1:50, 000 scale geological maps (MAGNA). The map uses the ETRS89 datum and UTM coordinates (30T northern zone) and covers an area of 140, 000 sq km. The compiled data shown in the map come from previous papers of the region (˜ 700 points) as well as from more than 800 additional points developed in the course of an exploratory project focused on the underground characterization of a potential CO2 reservoir in the so-called ‘Linking Zone''. The new data accomplish some basic criteria; they are accurately georeferenced and lithology, stratigraphic age and other technical details about the measurements (e.g. means and error) and methods are fully displayed
Estudio de las rocas paleozoicas y los macizos graníticos que afloran en el Parc Natural de l'Alt Pirineu y zonas colindantes mediante datos geológicos, geofísicos y petrofísicos
The Parc Natural de l’Alt Pirineu is located
between the La Maladeta and Andorra-
Mount Louis granites. The characterization
of the Parc’s geology at depth can help to
know the emplacement mechanism of these
granites, their relationships with the plutonic
and volcanic rocks outcropping to the North
and South of the Parc, respectively, and if all
these rocks belong to the same magmatic
system.
To achieve these objectives, in the frame
of the present research project, we have
compiled and homogenezed previous
gravimetric and magnetic data, and
acquired new geophysical data, in particular,
gravity data. We have also constructed
new geological cross-sections oriented
NE-SW from previous and new acquired
geological data and characterized the
petrophysical properties of the geological
units in order to obtain the density and
magnetic susceptibility of all different
rocks outcropping in the study area. The
geological cross-sections together with the
petrophysical data will be used in the 2,5
and 3D gravimetric modelling to improve our
understanding of the subsurface geology of
this part of the Central Pyrenees and of the
Parc Natural de l’Alt Pirineu.El Parc Natural de l’Alt Pirineu se encuentra
en la zona situada entre el granito de La
Maladeta y el granito de Andorra-Mount
Louis. Conocer y entender la geología del
subsuelo del Parc nos ayudará a saber
cómo se produjo el emplazamiento de
ambos macizos graníticos, su relación
con las rocas plutónicas y volcánicas que
afloran en la parte norte y sur del Parc,
respectivamente, y si forman parte de un
mismo sistema magmático.
Para alcanzar estos objetivos, se
está realizando una recopilación y
homogeneización de datos gravimétricos
y magnéticos ya existentes, así como la
adquisición de nuevos datos geofísicos,
en particular de gravimetría. Además,
partiendo de estudios geológicos previos
y datos propios, se está llevando a cabo
la realización de cortes geológicos de
dirección NE-SO y el estudio petrofísico
de las unidades geológicas para obtener
los valores de densidad y susceptibilidad
magnética de todos los tipos de rocas que
afloran en el área de estudio. Los cortes
geológicos junto con los datos de petrofísica
se utilizarán en la modelización gravimétrica
2,5D y 3D para mejorar la interpretación de
la geología del subsuelo en este sector de
II Jornades de Recerca del Parc Natural de l‘Alt Pirineu 87
los Pirineos Centrales y del Parc Natural de
l’Alt Pirineu.Este trabajo se está llevando a cabo en el marco de los subproyectos CGL2017-84901-C2-1 y CGL2017-84901-C2-2-P del Ministerio de Ciencia, Innovación y Universidades. Los desarrollos metodológicos en exploración con técnicas geofísicas se encuentran alineados con el proyecto europeo 3DGeoEU- GeoERA (ERANET Cofund action 731166 [H2020], Project code GeoE.171.005). Los autores agradecen al Parc Natural de l’Alt Pirineu las facilidades prestadas y la organización de las jornadas de investigación para mostrar los trabajos realizados
Geophysical cartography and Geochemical characterisation of the Valencia del Ventoso plutonic complex
The Valencia del Ventoso Massif is a plutonic complex that consists of different intrusive units whose compositions extend from gabbros to monzogranites. The main lithologic units display a zoned distribution whose geometry is distorted by reason of the mingling and dismemberment of the intrusive bodies. The geodinamic characterization based on the geochemical data shows that this plutonic complex corresponds to a high potassium calc-alkaline association, typical of an active continental margin or of a mature island arc environment. The Massif is covered by recent magnetic and radiometric flights, as well as by a regional gravimetric net (IGME 1997, 2001). The aeroradiometric, aeromagnetic and gravimetric maps show a high degree of agreement and they provide good view of the outcrop geometry and subsurface pattern of the main geological units of the complex. This paper shows that airborne geophysical cartography combined with surface geophysical data and field geological research is a very valuable mapping tool of complex plutonic bodie
Imaging the crustal structure of the Central Iberian Zone (Variscan Belt): The ALCUDIA deep seismic reflection transect
ALCUDIA is a 230 km long, vertical incidence deep seismic reflection transect
acquired in spring 2007 across the southern Central Iberian Zone (part of the pre-Mesozoic
Gondwana paleocontinent) of the Variscan Orogen of Spain. The carefully designed
acquisition parameters resulted in a 20 s TWTT deep, 60–90 fold, high-resolution
seismic reflection transect. The processed image shows a weakly reflective upper crust
(the scarce reflectivity matching structures identified at surface), a thick, highly reflective
and laminated lower crust, and a flat Moho located at 10 s TWTT (30 km depth).
The transect can be divided into three segments with different structural styles in the lower
crust. In the central segment, the lower crust is imaged by regular, horizontal and parallel
reflectors, whereas in the northern and southern segments it displays oblique reflectors
interpreted as an important thrust (north) and tectonic wedging involving the mantle
(south). The ALCUDIA seismic image shows that in an intracontinental orogenic crust,
far from the suture zones, the upper and lower crust may react differently to shortening
in different sectors, which is taken as evidence for decoupling. The interpreted structures,
as deduced from surface geology and the seismic image, show that deformation was
distributed homogeneously in the upper crust, whereas it was concentrated in wedge/thrust
structures at specific sectors in the lower crust. The seismic image also shows the location
of late Variscan faults in spatial association with the lower crustal thickened areas
Doñana. Acta vetebrata. vol 6(2)
Nuevos datos sobre el jarabugo, Phoxinellus hispanicus (Steindachner, 1866) (Pisces,Cyprinidae)Aplicación de técnicas multivariantes al estudio de dos poblaciones de bogas (Chondrostoma polylepis willkomi Stein.) (Pisces: Cyprinidae) en el sur de EspañaCrecimiento de Mauremys caspica leprosa (Schweigger, 1812) (Reptilia, Testudines) en la Reserva Biológica de DoñanaContribución al estudio de la alimentación de Asio otus en el sur de EspañaPrimeros datos sobre la dieta de la nutria Lutra lutra (L.), en aguas continentales de GaliciAnálisis cromosómico, carga de DNA y electroforesis de las liebres españolasEl cariotipo de la lagartija de Valverde (Algyroides marchi)Estudios cariológicos de las especies Algyroides marchi Valverde y Lacerta hispanica vaucheri Boulenger (Reptilia, lacertidae)Sobre la reproducción del eslizón canario (Chalcides viridanus) en la isla de Gran CanariaNididicación invernal de Asio otusCenso de limícolos en las salinas de Bonanza (Cádiz) en agosto de 1978.Observaciones de pito negro (Drycopus martius) en la provincia de SantandeNueva localidad para mirlo collarizo (Turdus torquatus)Observaciones deñ escribano nival (Plectrophenax nivalis) en la provincia de SantanderNidificación de Sturnus vulgaris en la provincia de Santander y anillamiento de pollosObservación de espátulas anilladas en la marisma de Santoña (Santander).Datos de ardeidas y gruiformes para Santander.Intento de cría de Oxyura leucocephala en la laguna de Medina (Cádiz)Presencia de Bufo bufo spinosus Daudin en la dieta de falconiformes y strigiformes en sierra Morena occidentalMartes foina (Erxleben, 1777) y no Martes martes (Linnaeus, 1758) en la isla de Ibiza (Pitiusas, Baleares)Notes on a collection of small mammals from San Vicente de la Barquera in northern SpainObservaciones sobre la reproducción del capibara (Hydrochoerus hydrochaeris) en los llanos de VenezuelaNuevos datos sobre Eumops dabbenei Thomas, 1914 (Chiroptera, molossidaePeer reviewe
Azole and amphotericin B MIC values against aspergillus fumigatus: High agreement between spectrophotometric and visual readings using the EUCAST EDef 9.3.2 procedure
The EUCAST EDef 9.3.2 procedure recommends visual readings of azole and amphotericin B MICs against Aspergillus spp. Visual determination of MICs may be challenging. In this work, we aim to obtain and compare visual and spectrophotometric MIC readings of azoles and amphotericin B against Aspergillus fumigatus sensu lato isolates. A total of 847 A. fumigatus sensu lato isolates (A. fumigatus sensu stricto [n = 828] and cryptic species [n = 19]) were tested against amphotericin B, itraconazole, voriconazole, posaconazole, and isavuconazole using the EUCAST EDef 9.3.2 procedure. Isolates were classified as susceptible or resistant/non-wild type according to the 2020 updated breakpoints. The area of technical uncertainty for the azoles was defined in the updated breakpoints. Visual and spectrophotometric (fungal growth reduction of >95% compared to the control, read at 540 nm) MICs were compared. Essential (+1 2-fold dilution) and categorical agreements were calculated. Overall, high essential (97.1%) and categorical (99.6%) agreements were found. We obtained 100% categorical agreements for amphotericin B, itraconazole, and posaconazole, and consequently, no errors were found. Categorical agreements were 98.7 and 99.3% for voriconazole and isavuconazole, respectively. Most of the misclassifications for voriconazole and isavuconazole were found to be associated with MIC results falling either in the area of technical uncertainty or within one 2-fold dilution above the breakpoint. The resistance rate was slightly lower when the MICs were obtained by spectrophotometric readings. However, all relevant cyp51A mutants were correctly classified as resistant. Spectrophotometric determination of azole and amphotericin B MICs against A. fumigatus sensu lato isolates may be a convenient alternative to visual endpoint readings