TY - JOUR AU - Gyulai, Ákos AU - Turai, Endre AU - Baracza, Mátyás Krisztián AU - Nádasi, Endre AU - Dankó, George TI - Results from the further development of CGI inversion on simulation and field data systems JF - CENTRAL EUROPEAN GEOLOGY J2 - CENT EUR GEOL VL - 67 PY - 2024 IS - 1 SP - 1 EP - 12 PG - 12 SN - 1788-2281 DO - 10.1556/24.2023.00131 UR - https://m2.mtmt.hu/api/publication/34765652 ID - 34765652 AB - A new series expansion-based method, the Combined Geoelectric Weighted Inversion (CGWI) procedure is presented and tested by using synthetic and in-field measured datasets. The method is an improved version of the Combined Geoelectric Inversion (CGI) robustified by involving Cauchy-Steiner weights in an Iteratively Reweighted Least Squares technique. The new procedure is compared to the Fourier series expansion-based 1.5D and the CGI methods as well as to the broadly applied RES2DINV inversion procedure. The field measurements are performed during stone exploration in an active quarry on the south-western slopes of the Mátra mountains, in northern Hungary. It is shown that the CGWI method gives stable and robust parameter estimation with acceptable accuracy. The comparison with other inversion methods is based on data distances, estimation errors and correlation parameters calculated on the base of the parameter correlation matrix. LA - English DB - MTMT ER - TY - JOUR AU - Demény, Attila TI - Stable hydrogen isotope compositions of tourmalines from the Sopron metamorphic complex: Metamorphic closure temperature and fluid composition JF - CENTRAL EUROPEAN GEOLOGY J2 - CENT EUR GEOL VL - 65 PY - 2023 IS - 2 SP - 178 EP - 182 PG - 5 SN - 1788-2281 DO - 10.1556/24.2023.00137 UR - https://m2.mtmt.hu/api/publication/34230758 ID - 34230758 AB - Stable hydrogen isotope compositions of metamorphic rocks and minerals can provide information on the origin of metamorphic fluids, which is especially important in systems that had experienced multiple metamorphic events. The Sopron orthogneiss-micaschist complex is a good target as it records signs of Variscan and Alpine metamorphic events as well as Variscan granitic magmatism. In this study tourmaline-bearing rocks (pegmatitic orthogneisses and kyanite-chlorite-muscovite schists) of the Sopron metamorphic complex were sampled and their tourmaline grains were analyzed for stable hydrogen isotope compositions (δ 2 H). The δ 2 H values (−23 ± 1‰, relative to V-SMOW) are in accordance with a fluid flux from devolatilization of subducted, seawater-containing rocks. Tourmaline-chlorite hydrogen isotope fractionations correspond to about 550 °C, indicating that δ 2 H values formed close to peak metamorphic temperatures are preserved without retrograde isotope exchange during cooling. LA - English DB - MTMT ER - TY - JOUR AU - Kiss, Gabriella Ilona AU - Szabó, Péter AU - Túri, Marianna AU - Futó, István AU - Kovács, János AU - Palcsu, László TI - Comparison of different preparation methods for oxygen isotope determination of phosphate in mammal tooth enamel JF - CENTRAL EUROPEAN GEOLOGY J2 - CENT EUR GEOL VL - 65 PY - 2023 IS - 2 SP - 144 EP - 157 PG - 14 SN - 1788-2281 DO - 10.1556/24.2023.00132 UR - https://m2.mtmt.hu/api/publication/34180795 ID - 34180795 N1 - Isotope Climatology and Environmental Research Centre, HUN-REN Institute for Nuclear Research, Debrecen, Hungary Doctoral School of Physics, University of Debrecen, Debrecen, Hungary Institute of Geography and Earth Sciences, University of Pécs, Pécs, Hungary Export Date: 1 January 2024 Correspondence Address: Kiss, G.I.; Isotope Climatology and Environmental Research Centre, Bem tér 18/C, Hungary; email: kiss.gabriella@atomki.hu AB - We tested several sample pre-treatment protocols for the study of oxygen isotope ratios in the phosphate phase of mammalian enamel of ten different fossil samples. We investigated the effect of different pre-treatment methods and the duration of the hydrogen fluoride treatment on enamel samples from skeletal phosphate with known δ 18 O values. The samples had been measured previously, so we could compare the ratios measured in our laboratory with the previous values to choose the best chemical preparation procedure. Four pre-soaking methods and two different time intervals of 2 mol dm −3 hydrogen fluoride treatment were compared during our experiments. In our experimental conditions, the distilled water wash and the 6 h of soaking in hydrogen fluoride gave the closest results to the expected δ -values. The steps of the tested preparation processes were repeated at least three times on each sample, so the reproducibility of the process could be also investigated. LA - English DB - MTMT ER - TY - JOUR AU - Kern, Zoltán AU - Llanos Campana, Daniela Maria AU - Hegyi, IN TI - Long-term performance of simultaneous measurement of stable isotopes of oxygen and carbon in cellulose with a high-temperature pyrolysis/gas chromatography/isotope ratio mass spectrometry system at the Institute for Geological and Geochemical Research JF - CENTRAL EUROPEAN GEOLOGY J2 - CENT EUR GEOL VL - 65 PY - 2023 IS - 2 SP - 137 EP - 143 PG - 7 SN - 1788-2281 DO - 10.1556/24.2023.00134 UR - https://m2.mtmt.hu/api/publication/33733907 ID - 33733907 AB - A high-temperature pyrolysis/gas chromatography/isotope ratio mass spectrometry system was established at the Institute for Geological and Geochemical Research in 2013. A dedicated field of application of the system is the simultaneous measurement of stable carbon and oxygen isotope ratios in the cellulose of modern, relict and subfossil plant tissues and sediments. The measurement protocol was fine-tuned during the first year of operation and documented in detail in this report. To quantify the long-term reproducibility of the simultaneous measurement of stable isotopes of oxygen and carbon in cellulose, a 2σ range inferred from repeated measurements of a Quality Assurance standard can be recommended: 0.16 and 0.20‰, for δ 13 C and δ 18 O, respectively. An extensive set of samples with known pyrolysis-based δ 13 C data was analyzed in combustion mode and the paired results were used to assess the necessity of adjustment of the pyrolysis-based δ 13 C measurements. The variances of the two datasets were not significantly different; the slope (intercept) of the regression was indistinguishable from unity (zero), suggesting that probably owing to the relatively frequent cleaning of the pyrolysis furnace, pyrolysis-based δ 13 C data neither suffer from a variance bias nor require a specific adjustment. LA - English DB - MTMT ER - TY - JOUR AU - Ludmány, Balázs AU - Domokos, Gábor TI - Pebbles, graphs and equilibria: Higher order shape descriptors for sedimentary particles JF - CENTRAL EUROPEAN GEOLOGY J2 - CENT EUR GEOL VL - 65 PY - 2022 IS - 2 SP - 158 EP - 177 PG - 20 SN - 1788-2281 DO - 10.1556/24.2023.00135 UR - https://m2.mtmt.hu/api/publication/34174919 ID - 34174919 N1 - HUN-REN-BME Morphodynamics Research Group, Budapest University of Technology and Economics, Budapest, Hungary Department of Control Engineering and Information Technology, Budapest University of Technology and Economics, Budapest, Hungary Department of Morphology and Geometric Modeling, Budapest University of Technology and Economics, Budapest, Hungary Export Date: 16 November 2023 Correspondence Address: Ludmány, B.; HUN-REN-BME Morphodynamics Research Group, Hungary; email: ludmany.balazs@cloud.bme.hu AB - While three-dimensional measurement technology is spreading fast, its meaningful application to sedimentary geology still lacks content. Classical shape descriptors (such as axis ratios, circularity of projection) were not inherently three-dimensional, because no such technology existed. Recently a new class of three-dimensional descriptors, collectively referred to as mechanical descriptors, has been introduced and applied for a broad range of sedimentary particles. First-order mechanical descriptors (registered for each pebble as a pair {S, U} of integers), refer to the respective numbers of stable and unstable static equilibria and can be reliably detected by hand experiments. However, they have limited ability of distinction, as the majority of coastal pebbles fall into primary class . Higher-order mechanical descriptors offer a more refined distinction. However, for the extraction of these descriptors (registered as graphs for each pebble), hand measurements are not an option and even computer-based extraction from 3D scans offers a formidable challenge. Here we not only describe and implement an algorithm to perform this task, but also apply it to a collection of 271 pebbles with various lithologies, illustrating that the application of higher-order descriptors is a viable option for geologists. We also show that the so-far uncharted connection between the two known secondary descriptors, the so-called Morse–Smale graph and the Reeb-graph, can be established via a third order descriptor which we call the master graph. LA - English DB - MTMT ER - TY - JOUR AU - Nemes, Istvan TI - Applications of automated Petrel workflows in 3D reservoir geologic modelling – A case study JF - CENTRAL EUROPEAN GEOLOGY J2 - CENT EUR GEOL VL - 65 PY - 2022 IS - 2 SP - 122 EP - 136 PG - 15 SN - 1788-2281 DO - 10.1556/24.2022.00129 UR - https://m2.mtmt.hu/api/publication/33118230 ID - 33118230 AB - Mature fields have been playing a significant role in the oil and gas realm recently, and redevelopment and optimization efforts are being made globally to prolong the lifetime of these resources. The aim of this study is to showcase the benefits of hydrocarbon reservoir modelling, with a special focus on various aspects of Petrel workflows. LA - English DB - MTMT ER - TY - JOUR AU - Fehér, Eszter AU - Havasi-Tóth, Balázs AU - Ludmány, Balázs TI - Fully spherical 3D datasets on sedimentary particles: Fast measurement and evaluation JF - CENTRAL EUROPEAN GEOLOGY J2 - CENT EUR GEOL VL - 65 PY - 2022 IS - 2 SP - 111 EP - 121 PG - 11 SN - 1788-2281 DO - 10.1556/24.2022.00124 UR - https://m2.mtmt.hu/api/publication/33093510 ID - 33093510 N1 - MTA-BME Morphodynamics Research Group, Budapest, Hungary Department of Morphology and Geometric Modeling, Budapest University of Technology and Economics, Budapest, Hungary Department of Fluid Mechanics, Budapest University of Technology and Economics, Budapest, Hungary Department of Control Engineering and Information Technology, Budapest University of Technology and Economics, Budapest, Hungary Cited By :1 Export Date: 11 December 2023 Correspondence Address: Fehér, E.; Department of Morphology and Geometric Modeling, K220, Műegyetem rkp. 1–3, Hungary; email: feher.eszter@epk.bme.hu Funding details: 134199 Funding details: Emberi Eroforrások Minisztériuma, EMMI Funding details: Nemzeti Kutatási, Fejlesztési és Innovaciós Alap, NKFIA Funding details: Innovációs és Technológiai Minisztérium, BME-NVA-02 Funding text 1: The authors would like to thank Krisztián Halmos for carrying out the hand measurements and for helping with the 3D scanning; Gábor Domokos for the fruitful discussions and his help in the field study; Bernd Krauskopf for helping to find a location to test the method; Géza Tóth for helping to build the camera crane. This research, supported by the NKFIH Hungarian Research Fund Grant 134199 and by Grant BME FIKP-VÍZ by EMMI, is gratefully acknowledged. The research reported in this paper and carried out at BME has been supported by the NRDI Fund (TKP2020 NC, Grant No. BMENCS) based on the charter of bolster issued by the NRDI Office under the auspices of the Ministry for Innovation and Technology. This research is also part of project no. BME-NVA-02, implemented with the support provided by the Ministry of Innovation and Technology of Hungary from the National Research, Development and Innovation Fund, financed under the TKP2021 funding scheme. AB - Recently it became increasingly evident that the statistical distributions of size and shape descriptors of sedimentary particles reveal crucial information on their evolution and may even carry the fingerprints of their provenance as fragments. However, to unlock this trove of information, measurement of traditional geophysical shape descriptors (mostly detectable on 2D projections) is not sufficient; fully spherical 3D imaging and mathematical algorithms suitable to extract new types of inherently 3D shape descriptors are necessary. Available 3D imaging technologies force users to choose either speed or full sphericity. Only partial morphological information can be extracted in the absence of the latter (e.g., LIDAR imaging). In the case of fully spherical imaging, speed was proved to be prohibitive for obtaining meaningful statistical samples, and inherently 3D shape descriptors were not extracted. Here we present a new method by complementing a commercial, portable 3D scanner with simple hardware to quickly obtain fully spherical 3D datasets from large collections of sedimentary particles. We also present software for the automated extraction of 3D shapes and automated measurement of inherently 3D-shape properties. This technique allows for examining large samples without the need for transportation or storage of the samples, and it may also facilitate the collaboration of geographically distant research groups. We validated our software on a large sample of pebbles by comparing previously hand-measured parameters with the results of automated shape analysis. We also tested our hardware and software tools on a large pebble sample in Kawakawa Bay, New Zealand. LA - English DB - MTMT ER - TY - JOUR AU - Czuppon, György AU - Demény, Attila AU - Leél-Őssy, Szabolcs AU - Stieber, J. AU - Óvári, Mihály AU - Dobosy, Péter AU - Berentés, A. AU - Kovács, R. TI - Cave monitoring in Hungary: An overview JF - CENTRAL EUROPEAN GEOLOGY J2 - CENT EUR GEOL VL - 65 PY - 2022 IS - 1 SP - 26 EP - 39 PG - 14 SN - 1788-2281 DO - 10.1556/24.2021.00109 UR - https://m2.mtmt.hu/api/publication/33628417 ID - 33628417 N1 - Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Eötvös Loránd Research Network, Budapest, Hungary Department of Hydrogeology and Engineering Geology, Institute of Environmental Management, University of Miskolc, Miskolc, Hungary Department of Physical and Applied Geology, Eötvös Loránd University, Budapest, Hungary Stieber Environmental Ltd., Budapest, Hungary Nuclear Security Department, Centre for Energy Research, Eötvös Loránd Research Network, Budapest, Hungary Institute of Aquatic Ecology, Centre for Ecological Research, Eötvös Loránd Research Network, Budapest, Hungary Duna-Ipoly National Park Directorate, Budapest, Hungary Export Date: 4 January 2024 Correspondence Address: Czuppon, G.; Institute for Geological and Geochemical Research, Budaörsi út 45., Hungary; email: czuppon@geochem.hu LA - English DB - MTMT ER - TY - JOUR AU - Gál, Péter AU - Németh, Norbert AU - Szakáll, Sándor AU - Zajzon, Norbert AU - Fehér, Béla AU - Dunkl, István TI - Nb–Ta mineralization in Ti-oxide minerals from the Bagolyhegy Metarhyolite Formation (Bükk Mountains, NE Hungary) JF - CENTRAL EUROPEAN GEOLOGY J2 - CENT EUR GEOL VL - 65 PY - 2022 IS - 1 SP - 1 EP - 13 PG - 13 SN - 1788-2281 DO - 10.1556/24.2021.00101 UR - https://m2.mtmt.hu/api/publication/32845875 ID - 32845875 N1 - Department of Petrology and Geochemistry, Eötvös Loránd University, Budapest, Hungary MTA-ELTE Volcanology Research Group, Budapest, Hungary Institute of Mineralogy and Geology, University of Miskolc, Miskolc, Hungary Department of Mineralogy, Herman Ottó Museum, Miskolc, Hungary Department of Sedimentology and Environmental Geology, University of Göttingen, Göttingen, Germany Cited By :1 Export Date: 9 December 2022 Correspondence Address: Gál, P.; Department of Petrology and Geochemistry, Pázmány Péter sétány 1/C, Hungary; email: galpeti93@gmail.com LA - English DB - MTMT ER - TY - JOUR AU - Kiri, Luca AU - Szemerédi, Máté AU - Pál-Molnár, Elemér TI - Petrographic evidences of open-system magmatic processes in the felsic rocks of the northern part of the Ditrău Alkaline Massif (Eastern Carpathians, Romania) JF - CENTRAL EUROPEAN GEOLOGY J2 - CENT EUR GEOL VL - 65 PY - 2022 IS - 1 SP - 49 EP - 76 PG - 28 SN - 1788-2281 DO - 10.1556/24.2022.00113 UR - https://m2.mtmt.hu/api/publication/32795968 ID - 32795968 N1 - Vulcano Petrology and Geochemistry Research Group, Department of Mineralogy, Geochemistry and Petrology, University of Szeged, Szeged, Hungary MTA-ELTE Volcanology Research Group, Budapest, Hungary Export Date: 3 January 2023 Correspondence Address: Kiri, L.; Vulcano Petrology and Geochemistry Research Group, 2 Egyetem Str., Hungary; email: kiri.luca@gmail.com LA - English DB - MTMT ER -