György Czuppon

Hungarian Academy of Sciences | HAS · Institute for Geological and Geochemical Research

The Italian Northern Apennines contain several Fe-Cu-Zn-bearing, Cyprus-type volcanogenic massive sulfide (VMS) deposits, which significantly contribute to the Cu resources of Italy. The massive sulfide lenses and related stockwork mineralizations are hosted by several levels (from basalt to serpentinite) of the unmetamorphosed ophiolitic series; t...

Recent fluvial tufa carbonates were investigated from the Szalajka Valley (Bükk Mts., Hungary) and Malom Valley (Balaton Uplands, Hungary) to (1) study the suitability of the published oxygen isotope-based palaeothermometers for tufa deposits, (2) find the most appropriate (closest to equilibrium) places downstream for temperature calculation. A g...

Research with deuterium-depleted water (DDW) in the last two decades proved that deuterium/hydrogen ratio has a key role in cell cycle regulation and cellular metabolism. The present study aimed to investigate the possible effect of deuterium-depleted organic compounds (DDOC) alone and in combination with DDW on cancer growth in two in vivo mouse m...

In the Middle Anisian, extensional tectonic movements led to the development of isolated carbonate platforms in the area of the southwestern part of the Transdanubian Range. The platforms are made up of meter-scale peritidal–lagoonal cycles bounded by subaerial exposure surfaces. One of the platform successions (Tagyon Platform) consists predominan...

Retrograde clay mineral reactions (reverse weathering), including glauconite formation, are first-order controls on element sequestration in marine sediments. Here, we report substantial element sequestration by glauconite formation in shallow marine settings from the Triassic to the Holocene, averaging 3 ± 2 mmol·cm − ²·kyr −1 for K, Mg and Al, 16...

The possible role of the naturally occurring deuterium in the regulation of cell division was first described in the 1990s. To investigate the mechanism of influence of deuterium (D) on cell growth, expression of 236 cancer-related and 536 kinase genes were tested in deuterium-depleted (40 and 80 ppm) and deuterium-enriched (300 ppm) media compared...

Cave monitoring was conducted in the Béke and Baradla caves in the Aggtelek Karst, in the Ajándék-Ariadne cave system in the Pilis Mountain, as well as in the Szemlőhegy and Pálvölgy caves in the Buda Mountain. Climatological data outside of the cave (e.g., temperature, amount of precipitation), within the cave (temperature, humidity, CO2 concentra...

The aim of the study was to reveal and compare the microbiota of different carbonate speleothems from two different epigenic karst regions (Baradla and Csodabogyós caves) in Hungary. Stalagmites, stalactites, soda straws, moonmilks, cave wall surfaces and dripping waters were sampled and plated on subsurface-environment imitating culture media cont...

In this study, already published and new monitoring data are compiled from the Baradla and Béke caves in the Aggtelek Karst, from the Vacska Cave in the Pilis Mountains as well as from the Szeml} ohegy and Pálvölgy caves in the Buda Hills. Recent investigations (2019-2020) include monitoring of climato-logical parameters (e.g., temperature, CO 2) m...

In the Transdanubian Range (Hungary), a wide spectrum of Triassic dolomites is known. Mechanism of dolomitization of the platform carbonate successions was subject of a number of studies but the study of dolomitization of basinal carbonates is very limited. Petrographical and isotope–geochemical characteristics of the Upper Triassic dolomitized car...

Natural CO2 reservoirs provide an opportunity to study long-term fluid-rock interactions, which are essential to reassure the safety of mineral storage of carbon-dioxide. The Mihályi-Répcelak field (Pannonian Basin, Central Europe) is one of the largest natural CO2-bearing reservoirs in Europe (25 Mt). The CO2 was trapped in Neogene sandstones, whi...

The effects of deuterium depletion on the human organism have been, except for the antitumor action, seldom investigated by now and the available data are scarce. In oncological patients who also suffered from diabetes and were treated with deuterium-depleted water (DDW), an improvement of glucose metabolism was observed, and rat studies also prove...

Retrograde clay mineral reactions (i.e., reverse weathering), including glauconite formation, are first-order controls on element (re)cycling vs sequestration in modern and ancient marine sediments. Here, we report substantial K–Mg–Fe sequestration by glauconite formation in shallow marine settings from the Triassic to the Holocene, averaging 4 ± 3...

The middle Anisian extensional tectonics of the Neotethyan realm developed a small, isolated carbonate platform in the middle part of the Balaton Highland (western Hungary), resulted in the deposition of uranium-bearing seamount phosphorite on the top of the drowned platform and produced some epigenetic fluorite veins in the Middle Triassic sequenc...

In the Maritime Alps (NW Italy - SE France), the Middle Triassic-Berriasian platform carbonates of the Provençal Domain are locally affected by an intense hydrothermal dolomitization. This dolomitization resulted from a large-scale hydrothermal circulation related to deep-rooted faults, and is indirect evidence of a significant earliest Cretaceous...

An integrated petrographic, fluid inclusion, noble gas, and stable isotope study was performed for the Late Oligocene, spatially associated Sukulu and Tororo carbonatite complexes in SE Uganda in order to understand their genesis and provide additional constraints on the evolution of the East African Rift System (EARS). Both carbonatite complexes c...

Noble gas isotopic composition of fluid inclusions was analyzed in amphibole, plagioclase and clinopyroxene phenocrysts from the shoshonitic and dacitic volcanic products of the Ciomadul volcanic dome field, the youngest volcanic system within the Carpathian-Pannonian Region. The highest Rc/RA ratios (3.0–3.8 RA) were obtained for high-mg clinopyro...

Precipitation was collected on daily basis at K-puszta regional background monitoring station located near Kecskemét, in the western part of the Great Hungarian Plain, between 1 April 2013 and 31 December 2017 for stable hydrogen and oxygen analyses. The sample collection period covered 24 hours, from 07:00 to 07:00 h LT (Local Time) the next day....

Speleothems (dominated by cave-hosted carbonate deposits) are valuable archives of paleoclimate conditions. As such, they are potential targets of clumped isotope analyses that may yield quantified data about past temperature variations. Clumped isotope analyses of stalagmites, however, seldom provide useful temperature values due to various isotop...

The combined use of the stable isotope compositions of speleothem carbonate and inclusion-hosted water presents great potential in paleotemperature reconstructions, due to the various temperature-dependent isotope fractionations detected in cave systems and their environment. This paper evaluates the applicational possibilities of hydrogen and oxyg...

A detailed knowledge of the stable isotope signature of precipitation is the basis of investigations in a variety of scientific fields and applications. To obtain robust and reliable results, the representativity of the currently operating (at least, as of 2018) precipitation stable isotope monitoring stations across Slovenia (n = 8) and Hungary (n...

Societal concerns about future hydroclimate changes urge a thorough understanding of the governing processes. Here, an analysis of Middle and Late Holocene speleothem-based hydroclimate reconstructions and paleoclimate model simulations reveals sub-millennial fluctuations in the spatiotemporal variability of precipitation in the European and Medite...

Tritium (3H) as a constituent of the water molecule is an important natural tracer in hydrological sciences. The anthropogenic tritium introduced into the atmosphere unintentionally became an excellent tracer of processes on a time scale of up to 100 years. A prerequisite for tritium applications is to know the distribution of tritium activity in p...

Speleothems deposited from cave drip waters retain, in their calcite lattice, isotopic records of past environmental changes. Among other proxies, δ18O is recognized as very useful for this purpose, but its accurate interpretation depends on understanding the relationship between precipitation and drip water δ18O, a relationship controlled by clima...

It is generally observed that precipitation is gradually depleted in 18 O and 2 H isotopes as elevation increases ('altitude' effect) or when moving inland from seacoasts ('continental' effect); the regionally accurate estimation of these large-scale effects is important in isotope hydrological or paleoclimatological applications. Nevertheless, sea...

The effects of deuterium depletion on the human organism have been, except for the antitumor action, seldom investigated by now and the available data are scarce. In oncological patients who also suffered from diabetes and were treated with deuterium-depleted water (DDW), an improvement of glucose metabolism was observed, and rat studies also prove...

The effects of deuterium depletion on the human organism have been, except for the antitumor action, seldom investigated by now and the available data are scarce. In oncological patients who also suffered from diabetes and were treated with deuterium-depleted water (DDW), an improvement of glucose metabolism was observed, and rat studies also prove...

Springs have an important role both in groundwater flow system understanding and in maintaining groundwater-related ecosystems. The aim of the research of the lukewarm karst springs in Kistapolca is to understand the origin of the elevated temperature (22–24 °C), i.e., whether it is the result of mixing of cold and thermal waters or it represents t...

Abstract. Tritium (³H) as a constituent of the water molecule is an important natural tracer in hydrological sciences. The anthropogenic tritium introduced into the atmosphere became unintentionally an excellent tracer of processes on the time scale of up to a 100 years. A prerequisite for tritium applications is to know the distribution...

Stable isotope composition of biological materials records the prevailing e.g. climatological, hydrological conditions; thus, serves as important biogeochemical marker in determining the authenticity of agricultural products and in tracing their origins. The application of isotopes of the water molecule in research activities is steadily increasing...

Dawsonite is often mentioned as an indicator for CO2 infiltration in geological reservoirs. Stable isotope characteristics of carbonates in CO2-bearing fluid reservoirs can help us to better understand the chemical and physical processes, which control carbonate dissolution and precipitation during infiltration of CO2-rich fluids. In addition, stab...

Alkotmány utca 9-11. Carbonates are among the most sensitive minerals in the CO2-porewater-rock system to detect the geochemical processes, which are induced by either natural or anthropogenic CO2 flooding. This paper compares sandstones in the natural CO2 reservoirs of the Mihályi-Répcelak site with those from Szolnok area derived from the same tu...

Mineralization of injected CO2 results in its permanent removal, desirable for climate mitigating carbon storage. Although the process has been shown to occur in small-scale gas injection studies1, it has not been shown in large scales in saline reservoirs, which are essential for industrial scale CO2 storage. The Mihályi-Répcelak field in the Pann...

This paper investigates the hydrothermal fluid circulation that was linked to the extensional evolution of the Adriatic rifted margin during the Jurassic opening of the Alpine Tethys. Remnants of this rifted margin are spectacularly preserved in SE Switzerland and N Italy. Five study areas were chosen ranging from the former proximal to the most di...

Prediction of the behavior of injected CO 2 in geological formations is strongly based on geochemical modeling, laboratory and field testing. However, all of these approaches have their major drawbacks, the first being much too simplistic, and the latter two out of realistic timescales (1-100 days vs. 100-1000 years) for deep subsurface storage. Na...

A stalagmitic flowstone deposit from the Béke Cave (called Nagy-tufa deposit), East-Central Europe is characterized by complex, climate related textural and geochemical records as documented from a drill core (BNT-2 core) covering the period of 4 to 1 ka cal BP. The core location was monitored in an earlier study. Based on monitoring, textural and...

Groundwater in the Cambrian-Vendian aquifer system in Estonia is characterised by the most depleted isotopic composition known in Europe (δ18O down to -23‰). The water most likely originates from glacial meltwater recharge from the Fennoscandian Ice Sheet in the Pleistocene. The aquifer system is characterised by relative high methane concentration...

The Viimsi peninsula is located north-east of Tallinn, capital of Estonia. The Cambrian-Vendian (Cm-V) aquifer system is a sole source of drinking water in the area. Historically, the groundwater exploitation has led to freshening of groundwater in the peninsula, but in recent years an increase in chloride concentrations and enrichment in δ18O valu...

Despite its thermodynamical metastability at near-surface conditions, aragonite is widespread in marine and terrestrial sediments. It abundantly forms in living organisms, and its abiotic formation is favored in waters of a Mg 2+ /Ca 2+ ratio > 1.5. Here, we provide crystallographic evidence of a nanocrystalline CaCO 3 polymorph, which precipitates...

The Middle Triassic shallow marine carbonates of the SE Pannonian Basin (Szeged Dolomite Formation) show evidence for multistage dolomitization and a complex diagenetic history. In first stage the whole sequence was completely dolomitized by reflux of slightly evaporated seawater. This process took place from the near surface till shallow burial re...

Carbon capture and storage have become a vital problem in the last decades because the concentration of carbon-dioxide is constantly increasing in the atmosphere in relation with anthropogenic emissions. To reach long-term safety of geological storage of CO2, we need to know the geological environment, its behavior, and the influence of the complex...

A globális klímaváltozás egyik okozója az antropogén eredetű CO2 kibocsátás. Az ipari folyamatokból származó CO2 leválasztása és felszín alatti tárolókban való elhelyezése (Carbon Capture and Storage) a CO2 emisszió csökkentésére lehet megoldás. A CO2 geológiai tárolása során kulcs kérdéseként merül fel, hogy milyen fizikai és geokémiai folyamatok...

Stable isotope systematics of carbonates found in the CO2-bearing reservoirs can help to better understand the chemical and physical processes, which control the carbonate dissolution and precipitation during CO2 flooding. In addition, they can be used to trace the origin of the fluids (CO2 and H2O), from which different mineral phases are formed....

One of the key questions of CO 2 geological storage is what physical and geochemical processes take place in the reservoir. In natural CO 2 occurrences, large concentrations of CO 2 are present in geological time scale. Therefore, study of these areas and the minerals, which form within the reservoir (i.e. carbonates), can reveal the reactions and...

Unique concretions occur in abandoned quarries of Miocene silica-rich pyroclastic rocks near Eger (NE Hungary). The almost spheroid concretions formed by secondary cementation processes, the pores of the cores are often filled with microcrystalline calcite, while the outer zones with Mn-oxide. There is no sign of chemical alteration of the pyroclas...

Introduction The investigation of natural CO2 occurrences can help to understand the main processes in a CO2 reservoir on geological time scale. Previous results show that the most sensitive minerals are carbonates in the CO2-pore water-rock system. Hence, after CO2-flooding, firstly carbonates dissolve in the pore water, which is a result of pore...

One of the possible bridging technologies to tackle the effects of climate change is Carbon Capture and Geological Storage (CCS). In order to ensure that injected CO2 is safely stored for the long term we need to understand physical and geochemical processes taking place as a result of injection to the subsurface. Carbonates (i.e., calcite, dolomit...

Dawsonite is often mentioned as an indicator mineral for CO2 infiltration in geological reservoirs. The study of stable isotope characteristics of carbonates in CO2-bearing fluid reservoirs can help us to have better understanding in the chemical and physical processes, which control carbonate dissolution and precipitation mechanism during infiltra...

The karst system of the capital city of Hungary, Budapest, the so-called Buda Thermal Karst (BTK), was mainly shaped by the discharging thermal waters at the northeastern margin of the Transdanubian carbonate aquifer system. The Molnár János underwater cave is located at one of the main discharge areas of the BTK and its passages are part of the ac...

The relationship between the atmospheric concentration of cosmogenic isotopes, the change of solar activity and hence secondary neutron flux has already been proven. The temporal atmospheric variation of the most studied cosmogenic isotopes shows a significant anti-correlation with solar cycles. However, since artificial tritium input to the atmosp...