TY - JOUR AU - Citrini, Andrea AU - Mayer, Adriano AU - Camera, Corrado AU - Erőss, Anita AU - Sültenfuß, Jürgen AU - Pezzera, Guido AU - Beretta, Giovanni Pietro TI - Hydrogeochemical and isotopic characterization of the main karst aquifers of the middle Valseriana (Northern Italy): Nossana and Ponte del Costone springs JF - APPLIED GEOCHEMISTRY J2 - APPL GEOCHEM VL - 106046 PY - 2024 SP - 106046 SN - 0883-2927 DO - 10.1016/j.apgeochem.2024.106046 UR - https://m2.mtmt.hu/api/publication/34876116 ID - 34876116 AB - Karst springs are one of the most exploited drinking water resources in the world. Isotopic and chemical analyses on these waters reveal essential insights into their hydrodynamics. Valseriana (Northern Italy) is a valley within the Italian Pre-Alps, characterized by high water availability. The main reasons are a bedrock consisting of very permeable carbonate formations and a mean annual precipitation above 1800 mm/y. In this context, the Valseriana spring catchments have become strategically important for the water exploitation and the domestic supply of Bergamo and the neighboring municipalities. This study general aim is to expand the knowledge on the two main karst systems (Nossana and Ponte del Costone), which together include twenty-three major and minor springs, by defining a state-of-the-art that will be useful in future decades to preserve this crucial resource. Specific objectives include i) verifying the applicability of the 3H/3He dating method in karst environments, ii) defining groups of springs according to their chemical and isotopic characteristics for possible safeguard actions, and iii) establishing a conceptual model of the internal dynamics of the two spring systems. A chemical and isotopic sampling campaign was specifically conducted between May 2018 and July 2019. A total of 34 water points were sampled, including natural springs, rivers, wells, karst caves, and nearby mines. Water sampling for 3H/3He isotopic analyses was proved possible through careful selection of the sampling points and the insertion of the pump tubing in the spring fractures. A first classification of springs into uniform hydrochemical groups was obtained by applying the hierarchical cluster analysis technique on major ions contents. These outputs were combined with information from the 3H/3He dating analyses and resulted in three different classes of springs. The three classes showed a clustering for elevations: at high, medium, and valley bottom elevations, respectively. Finally, the elaborations simplified the two karst systems by a hierarchical flow system model, dynamically controlled by different karst network development and infiltration water. LA - English DB - MTMT ER - TY - JOUR AU - Baloghné Kiss, Gabriella TI - A rézérc, a 2024-es év nyersanyaga JF - HONISMERET J2 - HONISMERET VL - 52 PY - 2024 IS - 2 SP - 103 SN - 0324-7627 UR - https://m2.mtmt.hu/api/publication/34868592 ID - 34868592 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Baloghné Kiss, Gabriella TI - Az év nyersanyaga, 2024: A rézérc több ezer éve JF - ÉLET ÉS TUDOMÁNY J2 - ÉLET ÉS TUDOMÁNY VL - 79 PY - 2024 IS - 16 SP - 486 SN - 0013-6077 UR - https://m2.mtmt.hu/api/publication/34868574 ID - 34868574 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Słodczyk, E AU - Pietranik, A AU - Repstock, A AU - Przybyło, A AU - Glynn, S AU - Haranginé Lukács, Réka TI - Zircon trace element fingerprint of changing tectonic regimes in Permian rhyolites from the Central European Lowlands JF - INTERNATIONAL JOURNAL OF EARTH SCIENCES J2 - INT J EARTH SCI VL - 113 PY - 2024 SP - 779 EP - 795 PG - 17 SN - 1437-3254 DO - 10.1007/s00531-024-02419-5 UR - https://m2.mtmt.hu/api/publication/34853974 ID - 34853974 AB - The late Carboniferous/early Permian post-collisional rhyolites (305–285 Ma) that formed in Central Europe have generally similar whole rock compositions to that of older Late-Variscan rhyolites (330–310 Ma). However, data compilation combining zircon age with the chemical composition of rhyolites from 20 units shows a trend of increasing zircon saturation temperature with decreasing age. This trend is particularly well identified in rhyolites from the Central European Lowlands (CEL)—consisting of the NE German and NW Polish Basin—and also correlates their location with the zircon saturation temperature increasing from SE to NW from 750°C to 850°C. We infer that these higher temperatures of zircon saturation reflect a contemporaneous change in the tectonic setting from collisional to divergent, reflecting the onset of the Central European continental rifting. This interpretation is further corroborated by the trace element compositions of the CEL zircons, which resembles zircon crystallized in a divergent setting. Interestingly, the zircon formed globally in this type of setting is chemically diverse, especially considering uranium concentration. For example, zircon from locations dominated by mafic magma fractionation, such as rhyolites from Iceland, have low U concentrations and low U/Yb ratios. On the other hand, zircon formed in rhyolites in rifted margins, like western North America, tends to have much higher U and U/Yb ratios. Such high concentrations are not observed in zircon from the CEL, suggesting that the mantle input could be higher and residence times within continental crust shorter than those for rhyolites from the Cenozoic western USA. This may, in turn, suggest that the region might have been affected by a hot spot, similar to that responsible for rhyolite formation of the Snake River Plain. LA - English DB - MTMT ER - TY - JOUR AU - Dodony, Erzsébet AU - Dódony, István AU - Sáfrán, György TI - EDIC intensity correction of electron diffraction JF - MICRON J2 - MICRON VL - 183 PY - 2024 PG - 6 SN - 0968-4328 DO - 10.1016/j.micron.2024.103649 UR - https://m2.mtmt.hu/api/publication/34852839 ID - 34852839 AB - Transmission electron microscopy (TEM) has recently become indispensable in determining crystal structures. The location of atoms in crystals can be determined using electron diffraction (ED) intensity data series if the diffracted intensities are directly proportional to the square of the structure factor (|Fhkl|2). However, due to the crystal thickness, the used electron wavelength and the potential misalignment of the measured crystal the detected intensities differ from the ideal values. A method, Electron Diffraction Intensity Correction (EDIC), and a computer program have been developed to recover the ideal |Fhkl|2 proportional intensities from experimental data for kinematic scattering, for further structure studies. LA - English DB - MTMT ER - TY - JOUR AU - Krezinger, Máté AU - Frey, Sándor AU - Perger, Krisztina AU - Gabányi, Krisztina Éva AU - An, Tao AU - Zhang, Yingkang AU - Gurvits, Leonid I AU - Titov, Oleg AU - Melnikov, Alexey AU - Paragi, Zsolt TI - Proper motion of the radio jets in two blazars at redshift above 3 JF - MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY J2 - MON NOT R ASTRON SOC VL - 530 PY - 2024 IS - 4 SP - 4614 EP - 4625 PG - 12 SN - 0035-8711 DO - 10.1093/mnras/stae533 UR - https://m2.mtmt.hu/api/publication/34846608 ID - 34846608 AB - There is still a limited number of high-redshift (z > 3) active galactic nuclei (AGNs) whose jet kinematics have been studied with very long baseline interferometry (VLBI). Without a dedicated proper motion survey, regularly conducted astrometric VLBI observations of bright radio-emitting AGN with sensitive arrays can be utilized to follow changes in the jets, by means of high-resolution imaging and brightness distribution modelling. Here, we present a first-time VLBI jet kinematic study of NVSS J080518 + 614423 (z = 3.033) and NVSS J165844 − 073918 (z = 3.742), two flat-spectrum radio quasars that display milliarcsecond-scale jet morphology. Archival astrometric observations carried out mainly with the Very Long Baseline Array, supplemented by recent data taken with the European VLBI Network, allowed us to monitor changes in their radio structure in the 7.6−8.6 GHz frequency band, covering almost two decades. By identifying individual jet components at each epoch, we were able to determine the apparent proper motion for multiple features in both sources. Apparent superluminal motions range , and are found to be consistent with studies of other high-redshift AGN targets. Using the physical parameters derived from the brightness distribution modelling, we estimate the Doppler-boosting factors (δ ≈ 11.2 and δ ≈ 2.7), the Lorentz factors (Γ ≈ 7.4 and Γ ≈ 36.6), and the jet viewing angles (θ ≈ 4.4° and θ ≈ 8.0°), for NVSS J080518 + 614423 and NVSS J165844 − 073918, respectively. The data revealed a stationary jet component with negligible apparent proper motion in NVSS J165844 − 073918. LA - English DB - MTMT ER - TY - CONF AU - Molnár, Bence AU - Galsa, Attila TI - Importance of thermal dispersion in porous medium based on synthetic numerical simulations T2 - 54. Ifjú Szakemberek Ankétja Absztraktkötet - LIV. Meeting of Young Geoscientists Book of Abstracts PY - 2024 SP - 16 EP - 17 PG - 2 UR - https://m2.mtmt.hu/api/publication/34846531 ID - 34846531 LA - English DB - MTMT ER - TY - JOUR AU - Ballai, I. AU - Forgácsné Dajka, Emese AU - McMurdo, M. TI - Parametric resonance of Alfvén waves driven by ionization-recombination waves in the weakly ionized solar atmosphere JF - PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A - MATHEMATICAL PHYSICAL & ENGINEERING SCIENCES J2 - PHILOS TRANS - R SOC A VL - 382 PY - 2024 IS - 2272 SN - 1364-503X DO - 10.1098/rsta.2023.0226 UR - https://m2.mtmt.hu/api/publication/34840443 ID - 34840443 N1 - Export Date: 07 May 2024; Cited By: 0; Correspondence Address: I. Ballai; Plasma Dynamics Group, School of Mathematics and Statistics, The University of Sheffield, Sheffield, Hicks Building, Hounsfield Road, S3 7RH, United Kingdom; email: i.ballai@sheffield.ac.uk LA - English DB - MTMT ER - TY - GEN AU - Mádlné Szőnyi, Judit TI - Zöld fenntarthatóság PY - 2024 UR - https://m2.mtmt.hu/api/publication/34840083 ID - 34840083 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Virtanen, Ville J. AU - Heinonen, Jussi S. AU - Märki, Lena AU - Galvez, Matthieu E. AU - Molnár, Ferenc TI - Sedimentary and metamorphic processes priming black shale for magmatic assimilation of sulfur: an example from the Virginia Formation, Minnesota, United States JF - MINERALIUM DEPOSITA J2 - MINER DEPOSITA PY - 2024 SN - 0026-4598 DO - 10.1007/s00126-024-01268-1 UR - https://m2.mtmt.hu/api/publication/34833357 ID - 34833357 AB - The copper-nickel(-platinum-group element) sulfide resources of the Duluth Complex, Minnesota, USA, formed by assimilation of sulfur from the Virginia Formation black shale. In the normal black shale of the Virginia Formation, sulfur is mainly hosted in disseminated pyrite, whereas mm-scale pyrrhotite laminae dominate in the sulfur-rich Bedded Pyrrhotite Unit. The Bedded Pyrrhotite Unit was the main supply of sulfur in some of the magmatic sulfide deposits but its origin has not been studied in detail. Using Raman spectroscopy, we show that the carbonaceous material within the regionally metamorphosed normal black shale is graphitized biogenic material. The Bedded Pyrrhotite Unit contains pyrobitumen that represents residues of oil that accumulated to porous horizons, which formed due to dissolution of precursor sedimentary clasts. Replacement of the clasts by quartz and sulfides facilitated the formation of the pyrrhotite laminae of the Bedded Pyrrhotite Unit, which likely occurred during regional metamorphism. LA - English DB - MTMT ER -