Characterization of the Cerdanya Neogene Basin by combining geophysical methods: passive seismic, magnetotelluric and gravimetry.

Congreso realizado en Toledo del 28 de noviembre al 1 de diciembre de 2022.[EN] The Cerdanya Neogene basin, located in the eastern sector of the Central Pyrenees, has been studied to characterize its structure in depth. The thickness of the Neogene filling of the basin (detrital materials with some levels of lignite) has been inferred by combining different geophysical exploration methods in a NW-SE trending profile that crosses, perpendicularly, the basin in its central part: passive seismic (H/V spectral ratio method and array technique), electromagnetic methods (MT and AMT) and gravimetry. Applying the array technique, the shear wave velocity (Vs) of the basin materials has been calculated, both for the Neogene deposits and the bedrock. These data combined with the results obtained from the H/V spectral ratio method allow deriving the bedrock geometry. The electromagnetic method provides the 2D electrical resistivity model, characterizing the geoelectric properties of the basin and depicting the presence of the d'Alp-la Tet fault, an important structural element of the basin. The electrical model inversion uses as an initial model the bedrock depth obtained from the passive seismic. In the residual Bouguer anomaly modelling, a satisfactory gravimetric model is obtained when the thickness of the Neogene deposits varies between 0 and 650 meters and assigned density of 2.2 g/cm3 , supported by the low Vs obtained. The thickness of the Neogene filling presents variations that are related to the presence of normal fault with small vertical offset. The application of this methodology, based on the combination of different geophysical exploration methods, has reduced the different uncertainties inherent in each geophysical method, and aim to characterize the Cerdanya Neogene basin geometry.Este trabajo se ha financiado con el proyecto PID2020-114273GB-C22 financiado por MCIN/AEI/10.13039/501100011033 del Ministerio de Ciencia e Innovación de España.Peer reviewe

Residual Bouguer anomalies in the Axial Zone (Central Pyrenees); characteristics and origin

Centro Nacional de Información Geográfica (España)[EN] This work integrates geological, geophysical and petrophysical data in order to study residual Bouguer anomalies localized in the Central Pyrenean Axial Zone (between the Noguera-Ribagorzana and Segre rivers to the West and East, respectively). The study area is characterized by thrust sheets of basement Paleozoic rocks forming an antiformal stack and southwards vergence due to the Alpine orogeny, high structural complexity related to the Variscan and Alpine deformation and scarce subsurface data. The Paleozoic rocks present a high variability both in lithology and age. The geological data are based on published geological cartographies and new acquired data, the gravimetric data consist of previous and new data acquired during the 2018 and 2019 (reaching a total of 3590 gravity stations) and the petrophysical data correspond to 526 density measurements. The Bouguer anomaly map of the study area shows a longwave relative minimum (~40 km) with several relative maxima and minima of short- and medium wave (between 2 and 20 km). The residual anomaly map, which allows to investigate the gravimetric anomalies that originated in the upper crust, shows a complex pattern of maxima and minima that does not follow the N110E Pyrenean main direction. Six NNESSO geological cross sections were gravimetrically modeled. The observed gravity response along the cross sections varies according to lithological and rheological changes in the upper crustal rocks, presence of evaporitic rocks both at surface and subsurface, presence of Upper Carboniferous granites, Ordovician gneisses and Neogene rocks belonging to the Cerdanya basin and rocks with different metamorphic grade. Our results also allow to delineate the lateral continuity of structures. This work highlights, in absence of other more resolute geophysical data, the high potential and applicability of gravity data acquired in structurally complex areas when combining with geological and petrophysical data in order to constrain geological models.Este trabajo se ha financiado con el proyecto PID2020-114273GB-C22 financiado por MCIN/AEI/10.13039/501100011033 del Ministerio de Ciencia e Innovación de España.Peer reviewe

Basement and cover architecture in the Central Pyrenees constrained by gravity data

A new gravity survey (1164 gravity stations and 180 samples for density analysis) combined with two new geological cross sections has been carried out in a sector of the Central Pyrenees in order to improve the characterization of basement and cover architecture. From North to South, the study area comprises the southern half of the Axial Zone and the northernmost part of the South-Pyrenean Zone. New gravity data were combined with previous existing databases to obtain the Bouguer and residual anomaly maps of the study area. The two cross sections, oriented NNE–SSW, were built from field data and previous surficial and subsurface data and cross the La Maladeta plutonic complex. The residual anomaly map shows values ranging from −18 to 16 mGal and anomalies mainly oriented N120E. The two 2.5D modelled cross sections show similar observed gravity curves coinciding with similar interpreted structural architecture. Data show a gravity high oriented N120E coinciding with the Orri basement thrust sheet and an important gravity depression, with the same orientation, coinciding with the leading edge at depth of the Rialp basement thrust sheet and interpreted as linked to a large subsurface accumulation of Triassic evaporites. The volume at depth of the La Maladeta and Arties granites has been constrained through gravity modelling. This work highlights that the combination of structural geology and gravity modelling can help to determine the structural architecture of an orogen and localize accumulations of evaporites at depth.This work is part of the project CGL2017-84901-C2-2-P funded by MCIN/AEI/10.13039/501100011033 and “ERDF A way of making Europe” and project PID2020-114273GB-C22 funded by MCIN/AEI/10.13039/501100011033 from Spanish Ministry of Science, Innovation and Universities. Seequent has provided us the GM-SYS module of the Oasis Montaj. The authors acknowledge the contribution of José María Llorente and Agustin González for the acquisition of the gravity data. We thank to Aigüestortes National park and Alt Pirineu Natural park their logistic support. We thank anonymous reviewer for improving the content in the manuscript. This study represents a contribution to GeoAp Research Group (E01-20R) (Aragón Government).Peer reviewe

Petrophysical characterization of non-magnetic granites; density and magnetic susceptibility relationships

In this work we establish reliable correlations between density and magnetic susceptibility in three paramagnetic granites from the Pyrenees. In total, 128 sites (310 density measurements and >2600 susceptibility ones) were studied in the Mont Louis-Andorra, Maladeta and Marimanha granitic plutons covering the main range of variability of magnetic susceptibility. Regressions were calculated for every granitic body and an integrated linear function was obtained for the entire dataset: ρ (kg/m3) = 2566 (kg/m3) + 0.541κ (10−6 S.I.) (R:0.97). This relationship is only valid in the paramagnetic domain, where iron is mostly fractioned in iron-bearing phyllosilicates and the occurrence of magnetite is negligible (or at least its contribution to the bulk susceptibility). This relationship, likely different in other bodies, allows for transforming magnetic susceptibility data into density data, helping to constrain gravity modelling when density data from rock samples are scarce. Given the large amount of AMS studies worldwide, together with the quickness and cost-effectiveness of susceptibility measurements with portable devices, this methodology allows for densifying and homogenizing the petrophysical data when modelling granite rock volumes based on both magnetic and gravimetric signals.This work was financed by the projects GeoPiri3D (CGL2017-84901-C2-2-P), UKRIA4D (PID2019-104693GB-I00/CTA) and IMAGYN (PID2020-114273GB-C22) from the Spanish Ministry of Science (funded by MCIN/AEI/10.13039/501100011033 and “ERDF A way of making Europe”). This work is methodologically related also with the 3DGeoEU project financed by the European Commission under the ERANET Cofound action GeoERA (Grant No.: 731166). The GeoAp Research group from the Aragonian Government is also acknowledged. We are also in debt to the staff of the Petrophysical Laboratory (IGME, Tres Cantos) and to the Geophysics technicians (José Mª Llorente and Agustín González). The help of the Rock Magnetism Laboratory of the Centre Européen de Recherche et d’Enseignement de Géosciences de l’Environnement (CEREGE) in Aix en ProvenceMarseille is also acknowledged. P.C. acknowledges funding from PTA2017-14779-I and FJC2019- 041058-I (AEI-Spain) contracts. E.B. thanks the Geomodels Research Institute of the University of Barcelona and GGAC-2017SGR596 (Generalitat de Catalunya).Peer reviewe

pilotSTRATEGY project 2021-2026: “CO2 Geological Pilots in Strategic Territories”

[EN] The pilotSTRATEGY (2021-2026) is investigating geological CO2 storage sites in industrial regions to support development of large-scale carbon capture and storage (CCS). It is focused on deep saline aquifers–porous rock formations filled with brine several kilometres below ground – which promise a large capacity for storing captured CO2. The goal of the characterisation is to assess the site’s containment, injectivity, capacity, integrity, hydrodynamics, and monitorability in order to ensure safe and permanent storage of CO2. PilotSTRATEGY covers the initial stages of project development up to the pre-final investment decision (pre-FID), regulatory approval and permitting of storage, and applied on selected structures of Paris Basin in France, the Lusitanian Basin in Portugal and the Ebro Basin in Spain, and in lower detail, in West Macedonia in Greece and Upper Silesia in Poland.The project has received funding from the European Union’s Horizon 2020 programme (10.1 million Euros, No. 101022664).Peer reviewe

Subsurface Geophysics and Geology (GEOFSU

[EN] The geophysics line at the IGME began in 1927 as a Geophysics Sectiondedicated to subsurface exploration. During all this time, it has been developed in order to support and give expert service in all IGME’s activities both as a geological service and public research institution, as well as a research and development work itself. On the other hand, in recent years the IGME has promoted a line of research aimed at the characterization and 3D modeling of geological structures and formations, the development of dedicated software and the evolution and sophistication of computer equipment. The new scenario of incorporation of the IGME to the CSIC as a national reference center in the field of Earth Sciences has allowed the establishment of the GEOFSUB Research Group (Subsurface Geophysics and Geology). It is constituted by 21 members who had been collaborating regularly of the IGME former scientific-technic areas Geophysics and remote sensing (Área de Geofísica y Teledetección) and Subsurface geology and 3D geological modelling (Área de Geología del Subsuelo y Modelización Geológica 3D). Our main differentiating element is our extensive knowledge of geophysical and geological techniques, which allows us to characterize the subsoil in an optimal waPeer reviewe

Treatment with tocilizumab or corticosteroids for COVID-19 patients with hyperinflammatory state: a multicentre cohort study (SAM-COVID-19)

Objectives: The objective of this study was to estimate the association between tocilizumab or corticosteroids and the risk of intubation or death in patients with coronavirus disease 19 (COVID-19) with a hyperinflammatory state according to clinical and laboratory parameters. Methods: A cohort study was performed in 60 Spanish hospitals including 778 patients with COVID-19 and clinical and laboratory data indicative of a hyperinflammatory state. Treatment was mainly with tocilizumab, an intermediate-high dose of corticosteroids (IHDC), a pulse dose of corticosteroids (PDC), combination therapy, or no treatment. Primary outcome was intubation or death; follow-up was 21 days. Propensity score-adjusted estimations using Cox regression (logistic regression if needed) were calculated. Propensity scores were used as confounders, matching variables and for the inverse probability of treatment weights (IPTWs). Results: In all, 88, 117, 78 and 151 patients treated with tocilizumab, IHDC, PDC, and combination therapy, respectively, were compared with 344 untreated patients. The primary endpoint occurred in 10 (11.4%), 27 (23.1%), 12 (15.4%), 40 (25.6%) and 69 (21.1%), respectively. The IPTW-based hazard ratios (odds ratio for combination therapy) for the primary endpoint were 0.32 (95%CI 0.22-0.47; p < 0.001) for tocilizumab, 0.82 (0.71-1.30; p 0.82) for IHDC, 0.61 (0.43-0.86; p 0.006) for PDC, and 1.17 (0.86-1.58; p 0.30) for combination therapy. Other applications of the propensity score provided similar results, but were not significant for PDC. Tocilizumab was also associated with lower hazard of death alone in IPTW analysis (0.07; 0.02-0.17; p < 0.001). Conclusions: Tocilizumab might be useful in COVID-19 patients with a hyperinflammatory state and should be prioritized for randomized trials in this situatio

Modelización gravimétrica y aeromagnética en el SE de la Cuenca del Duero (provincias de Ávila y Segovia): factores geológicos que controlan la distribución de As (Arsénico) y otros ETGPT (Elementos Traza Geogénicos Potencialmente Tóxicos) en las aguas subterráneas

El principal objetivo de este trabajo es conocer los factores geológico-estructurales que controlan la distribución de As y otros ETGPT en el límite SE de la Cuenca del Duero. El análisis del mapa de anomalía residual de Bouguer define un conjunto de lineamientos que ayudan a reconocer la estructura del borde sur de la Cuenca del Duero, que junto con la modelización 2+1/2D de tres perfiles permite conocer las estructuras principales a favor de las cuales pueden generarse zonas de flujo preferente que propicia la entrada de elementos traza como el As. Independientemente de la influencia que pueden tener las rocas que conforman el basamento (metasedimentarias o graníticas), la fracturación alpina parece determinante en la distribución de As disuelto.Unidad de Tres Cantos, Instituto Geológico y Minero de España, EspañaÁrea de Geología, Universidad Rey Juan Carlos, EspañaUnidad de Salamanca, Instituto Geológico y Minero de España, Españ

Plutonismo Pérmico-Carbonífero alumino-potásico en la Zona Surportuguesa. El granito cordierítico de El Crispinejo

En el Batolito de la Sierra Norte hay un evento plutónico tardío, poco conocido, caracterizado por pequeños plutones graníticos peralumínicos, ricos en cordierita, siendo el plutón de El Crispinejo el que presenta las mejores relaciones de campo para realizar este tipo de estudio. Este plutón intruye en materiales del Devónico, el Complejo Vulcano-Sedimentario y las rocas ígneas del Batolito de la Sierra Norte. Estos plutones muestra una buena respuesta geofísica-radiométrica (K-Th-U), en especial por su alto contenido en K, en contraste con los granitoides trondhjemíticos que forman parte de la serie TTG del BSN. Una edad U-Pb ID-TIMS concordante de 300.5 ± 0.5 Ma obtenida en monacitas apunta a la existencia de un evento magmático tardi-Varisco en la Zona Surportuguesa, que se sitúa en el tránsito entre Carbonífero-Pérmico. Esta actividad ígnea podría estar relacionada con una serie de indicios mineros (F-Pb-Zn, Sn-W) completamente distintos a los que caracterizan a la Faja Pirítica Ibérica (sulfuros masivos y manganeso).Unidad de Salamanca, Instituto Geológico y Minero de España, EspañaUnidad de Tres Cantos, Instituto Geológico y Minero de España, EspañaInstituto Geológico y Minero de España, Españ

Control morfoestructural de la distribución de arsénico en el sur de la Cuenca del Duero

Jornada de Geología Médica en España (1ª. 2016. Salamanca). - Texto en español, con resumen y palabras claves en español e inglésEl principal objetivo de este trabajo es conocer los factores geológico-estructurales que controlan la distribución de As en el límite sur de la Cuenca del Duero. El análisis del mapa de anomalía residual de Bouguer define un conjunto de lineamientos que ayudan a reconocer la estructura del borde sur de la Cuenca del Duero, que junto con la modelización 2+1/2D de tres perfiles permite conocer las estructuras principales a favor de las cuales pueden generarse zonas de flujo preferente que propicia la entrada de elementos traza como el As. Independientemente de la influencia que pueden tener las rocas que conforman el basamento (metasedimentarias o graníticas), la fracturación alpina parece determinante en la distribución de As disuelto. = The aim of this work is to study the structural and geological patterns that control the distribution of As in the south of the Duero Basin. Residual Bouguer anomaly map depicts a set of lineaments that helps to unravel the structure of the Duero Basin southern limit, together with the 2+1/2D modelling of three profiles. The main structures promote fluids that encourage the input of some trace elements as As. Regardless of the basement (metasedimentary or granitic), Alpine fracturing seems to be the key of the distribution of dissolved As.Área de Geofísica y Teledetección, Instituto Geológico y Minero de España, EspañaÁrea de Geología, Universidad Rey Juan Carlos, EspañaDepartamento de Investigación en Recursos Geológicos, Instituto Geológico y Minero de España, Españ