Zoltan Unger

• PhD habil.
• Professor (Associate) at Eötvös Loránd University, Szombathely Campus, Hungary

Az epikarszt fejlettsége és a felszíni formakincs kapcsolatát elemezzük karsztterületeken a célból, hogy a Dunántúli.középhegységben az oldódásos dolinák hiányának okát értelmezzük. Ehhez a vizsgálatba bevont karsztterületek feküjének VESZ mérésekkel az átlagos fajlagos ellenállásait hasonlítjuk össze. Megállapítható, hogy a Bakonyvidéken, ahol nin...

The history of exploration shows abundant evidence that new data, new concepts and new interpretations can lead to the discovery of new plays and new prospects in mature basins" is the starting sentence on https://www.beicip.com/mature-basins homepage, what we can confirm from our experience too. The idea of deep-sea salt generation creates the nec...

Our results suggest that all conditions supporting the formation of methane hydrate exist in the Miocene Transylvanian Basin. The methane, generated from the primary (biodegradation) and the secondary sources, was trapped in water clathrates, creating multiple Miocene methane hydrate horizons preserved for millions of years until the Eastern Carpat...

This investigation delineates the impacts of mining on karst systems, with a focus on specific karst zones, namely the epikarst, the vadose zone, and the phreatic zone, which includes the epiphreatic zone. Mining activities, regardless of the karst area type, predominantly affect these zones. When mining occurs at the surface or within the epikarst...

Surface forms above the mine (Ármin mine) of Mount Bocskor (Southern Bakony, Hungary) were examined. We made contour maps, plan maps, morphological maps and atectonic grike (cave) maps of some of the forms and their surroundings. We examined the distribution of the depth, length, elongation ratio in case of some depressions, the relation between th...

In geology we often revise theoretical models; upon finding new evidence,such as the discovery of methane hydrates, the initial model will be challenged immediately. Hereby the authors put forward two postulates:1) There is a third, previously unexplored source of methane in the Transylvanian Basin, based on a new theoretical approach on methane hy...

This short study aims to highlight contradictions in Ochsenius’s model for the basin-wide salt generation (Kara-Bogas bay desiccation). Without claiming completeness, and through numerous records cited from the specific literature, we attempt to point at crucial incoherencies in the classical evaporitic model. In our presupposition, these might hav...

Natural membrane polarisation is a phenomenon known in soil studies, in argillaceous mineral experiments, and even in geophysics. This process can be stimulated; as a consequence, geophysicists have developed the Induced Potential (IP) method. It is less known, this kind of natural membrane polarisation in – even - deep marine and in buried sedimen...

Surface tension supporting deposited sediments is one of the unusual properties of deep hypersaline anoxic basins (DHAB). It has also been proven that the following properties are also true for the water of a DHAB: high viscosity, extremely high salinity concentration. Accordingly, this water behaves similar to starch; as a non-Newtonian fluid. The...

The existence of deep marine hypersaline anoxic basins (DHAB) has been well-documented starting with the MedRiff Project in the Eastern Mediterranean. We suppose that there is analogy between the recent and ancient DHABs. This premise allows us to hypothesize that some methane accumulations in geological reservoirs may have been generated by histor...

The sediment formation for the lakes of karstic depressions has been examined by model experiments. The size of the depositing grains depends upon the speed of water level decrease of lakes, i.e. that of the experimental basin, because a grain can deposit when the speed of its deposition is bigger than the water level decrease. In those suspensions...

The conditions for sediment accumulation in the intermittent lakes of subsidence dolines were modelled in laboratory. For a given water table sinking rate we investigated the grain size and settling velocity of the sediment that is deposited in the basin. Two types of suspension were made that had natural-like characteristic features. In both types...

A limestone-dolomite horst of the Southern Bakony Mountains, Kab Mountain is capped by basalt lava and mantled by loess. Karstic phenomena occur on the rim of the basalt terrain and in the karstic windows. On the rim of the basalt one can find ponors in blind valleys. Karstic windows, an outstanding feature of Kab Mountain, were formed on sites whe...

In this chapter the longest stream cave in Hungary, located in the Gömör-Torna Karst (Slovak: Gemersko-Turniansky kras, Aggtelek Karst and Slovak Karst) is presented. The caves of this karstic system have been included into the UNESCO World Natural Heritage list. Among the most spectacular dripstone caves in Europe, Baradla Cave has two levels and...

In the chapter the denudation of metamorphic rocks with carbonate content is presented from the Kőszeg Mountains and its impact on geomorphic evolution is described. The calcareous phyllites and greenschists contain calcium carbonate in considerable amounts and have different dissolution properties. At the same time, dissolution is also influenced...

We tried to estimate the size of Coriolis force for Tisza River, which we consider responsible for the westward shifting of the river. We do not deny the tectonic footprints of the river courses, which have mostly locally, well encountered effect, but due to the regional course change we consider that Coriolis force can reach sizes, which long last...

Our aim was the prediction of karstification. We measured the karstic bedrock and the overlying superficial cover in four areas of Hungary and one area in Romania. One of our tools was the widely used geophysical techniques i.e. VES and multi-electrode method. We also made observations on mountainous, Mediterranean and tropical karsts. In these are...

We studied the evolution of dolines in ground ice environment, in a paleouvala of the Hochschwab Mts. (Northern Calcareous Alps, Austria) as well as in laboratory conditions. We measured the ground ice thickness of the exploration area by geophysical methods. We estimated the melting (thinning) speed and the pertinent parameters for ground ice samp...

Our aim was to commemorate the first Romanian Agrogeological Map, which was compiled over 100 years ago and presented at the First International Agrogeological Congress. That period was the beginning of the international reputation of the Romanian institutional geology. This proves that the establishment of Geological Institute of Romania was neces...

Three interesting geological map items, showing at least a part of Transylvania, are introduced in this work: the Herbich map (1878) of the historical Siculia, the 1896 and 1922 maps of the historical Hungary. The map of Herbich is the first member of the famous map series of the freshly founded Royal Geological Institute of Hungary. The 1896 map i...

p>The study of the evolution of the river network in the Great Hungarian Plain has been based on sedimentological, neotectonical, morphological investigations, heavy mineral analysis and complementary OSL dating. The study area extends from the Körös sub-basin into the Ir and Berettyó river valleys which are situated northeast from the subsiding ba...

The geology and geomorphology of the Székelyland, the area at the inner side of the eastern extremity of the Carpathian arc is investigated using Landsat TM satellite imagery. Elongated, linear features, the lineaments are located and discussed. Digital image processing has been applied to the imagery: kernel filters (high-frequency trend-filtering...

We studied cooling textures of basalts of NASA lunar, chondrules of NIPR Antarctic meteorite sets and reconstructed textures of a thick lava column of a mafic lava flow on planetary surface; terrestrial counterparts were also involved in comparisons.

The role of remote sensing is well known and can be successfully applied as an initial step in surface geologic exploration. The aim of this study, by means of Landsat TM 7 image interpretation, is to assist photogeologic map compiling, which will serve as a core document for an upcoming field mapping exercise. The mathematical background and the w...

The Gödöllö Hills are located east of Budapest, in the central part of the Pannonian Basin, Hungary. The upper 1 km is consisted of Upper Miocene to Pliocene, poorly lithified sand(stone), siltstone and claystone of lacustrine, delta or fluvial origin. These sediments are covered by Quaternary loess units with intercalated paleosols, dune and fluvi...

Various types of brecciation were studied on NASA Lunar Set, NIPR Antarctic meteorite set, chondritic meteorites from Hungary, terrestrial rock samples and ceramic industrial samples; their processing steps were compared in our course.

NASA Lunar Set basalts' a) paragenetic sequences, b) textural characteristics (model by cellular automata), c) cooling rates were studied, TTT diagram of basalts was constructed, technologies (industrial TTT diagrams) were compared.

One of the launching factors to commence the research activity below was the linking of fault-statistics calculations and elements of the fractal geometry. Due to the results the relationship was proven and their importance was illustrated on a hydrocarbon field case study.

A Körös-medence alluviális síkságának területén az egykori folyóhálózat nyomait rekonstruáltuk légifotó-elemzések, űrfelvételek, SRTM adatok és a folyószabályozás előtti természetes vízhálózatot mutató 18. századi topográfiai térképek alapján. Az elemzések azt mutatták, hogy a területen egy északkelet felől érkező nagy, meanderező folyó folyt, míg...