Janos Szepesi

Janos Szepesi
Insitute for Nuclear Research, Hungarian Academy of Sciences, Debrecen, Hungary

PhD.

About

39
Publications
7,733
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233
Citations
Introduction
Senior researcher at Institute for Nuclear Research Isotope Climatology and Environmental Research Centre (ICER), member of the Hungarian Volcanology Research Group. Chairman of the Hungarian Progeo conservation of the Geological Heritage. Research interest include: lithofacies architecture of the silicic lava domes and ignimbrites, quantitative textural analysis, obsidian studies (FTIR, DSC, DTA), regional geological mapping, geoconservation mapping, geodiversity assessment

Publications

Publications (39)
Article
Full-text available
Repeated explosive eruptions of large volume silicic magmas during the early- to mid-Miocene resulted in pyroclastic deposits covering at least 50,000 km2 in the Pannonian Basin. They form extended marker horizons and therefore these pyroclastic formations have a great stratigraphic importance. Lithostratigraphic characterization and classification...
Article
We compared the sedimentary provenance signature of modern river sediments collected from 14 different rivers entering the Pannonian Basin. The Pannonian Basin is one of the largest sedimentary basins of Europe filled up by multiple potential sediment sources. However, the contribution of individual source areas is unknown and complex basin-fill mi...
Article
This work studies a submarine volcanogenic apron forming the Nagyhársas Andesite Formation (Badenian – Middle Miocene) in the Mátra Mountains (North-Eastern Hungary), with the aim to identify volcanic processes, from the sedimentary bed scale to the architecture of the whole apron. Fieldwork has been carried out in two different localities (Tar and...
Article
Full-text available
Within the integrated network of protected geosites in nature conservation areas, nature trails have been established in Hungary since 1990. These trails play a major role in the organization of field-based geo-education activities. The Hungarian Geo-tope Day was established in the study area in 2009, based on the model of the Ger-man Geotope Day (...
Article
Full-text available
Transcarpathia is politically the westernmost county of Ukraine but geographically is the northeastern part of the Carpathian-Pannonian Region. The aim of our present work is to provide a brief overview and greater publicity about the geoheritage values of Transcarpathia using 45 documented geosites (stratigraphic, volcanic, geomorphological, miner...
Article
Cultural landscapes were developed as a result of continuous interaction between nature and human culture. During their evolution, the geodiversity was also considerably influenced by human activities. Recently, geoheritage studies have become more sensitive towards man-made cultural landmarks. In this paper, we explore a methodology to compile a r...
Article
This work focuses on the Miocene Telkibánya Lava Dome Field (Tokaj Mountains, Hungary), proposed as an example of poorly investigated lithofacies architecture of old silicic lava dome fields. A detailed fieldwork, combined with petrographic and radiometric (K/Ar dating) analyses, allows us the redefinition of the volcano-stratigraphy of a 25 km2 ar...
Article
Full-text available
The changes in the exploitation of natural stones emphasize the continuous changes of cultural landscapes. The widespread Miocene rhyolite tuffs of The Tokaj Mountains usually intensively silicified increasing the hardness of the material. The grinding of cereals and ores required high quality, long lasting millstones from the mining industry. The...
Conference Paper
Full-text available
During the Mid-Miocene the northern part of the Pannonian basin was characterized by shallow-to deep-marine environments surrounding subaerial volcanoes. In the early stage of their activity (from about 18 Ma to 15-16 Ma), explosive eruptions of silicic magmas emplaced thick ignimbrite units party on land and partly underwater. After this first sta...
Article
Ciomadul is the youngest volcanic system in the Carpathian-Pannonian Region recording eruptive activity from ca. 1 Ma to 30 ka. Based on combined zircon U-Th and (U-Th)/He geochronology, Ciomadul volcanism is divided into two main eruptive periods: Old Ciomadul (1 Ma – 300 ka; OCEP) and Young Ciomadul Eruptive Period (160–30 ka; YCEP). OCEP activit...
Article
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Tokaj Mountains (TM) is well known for the occurrence of the Carpathian Obsidian. This paper presents a general stratigraphy, geochronology and lithology framework for Miocene volcanic successions associated with obsidian formation in the area. Specific localities were chosen to show an accurate description of the geological settings. The primary o...
Article
A természeti környezet abiotikus tényezőit összefoglaló geodiverzitás jelentőségének felismerése az elmúlt 30 évben kapott egyre szélesebb körű nyilvánosságot. Az erre épülő geoturizmus a bemutatóhelyek számának növekedésével, minőségi fejlesztésével látványos növekedésen ment keresztül, ahogyan a két hazai UNESCO Globális Geopark (Novohrad–Nógrád,...
Conference Paper
Full-text available
A Pannon-medence kialakulását változatos vulkáni működés kísérte, amelyen belül kezdetben szilíciumgazdag magmák robbanásos felszínre törése volt a domináns. A nagy területen lerakódott vulkáni képződmények rétegtani szerepét már egy évszázada felismerték (Noszky, 1912; 1941) és e képződmé-nyek fontos szerepet játszottak a miocén tagolásában (Hámor...
Article
Full-text available
: Xanthoparmelia mougeotii is a usnic acid containing, small foliose, sorediate, parmelioid lichen species with a pantemperate distribution. In Europe it occurs in most countries especially in cool, humid, “suboceanic” habitats, mainly on acidic rocks, and rather sporadic in the continental areas, e.g. isolated populations in Slovakia (near Strečno...
Article
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In protected areas (e.g. geoparks, UNESCO sites), the identification of the different aspects of geoheritage site values is part of a holistic concept of protection, education and sustainable development. In the past years, significant progress has been achieved in the volcano tourism in Hungary as shown by the acceptance of two geoparks as members...
Article
Full-text available
A silicic ignimbrite flare-up episode occurred in the Pannonian Basin during the Miocene, coeval with the syn-extensional period in the region. It produced important correlation horizons in the regional stratigraphy; however, they lacked precise and accurate geochronology. Here, we used U–Pb (LA-ICP-MS and ID-TIMS) and (U–Th)/He dating of zircons t...
Conference Paper
The petrographic and quantitative studies of the lithic rich pyroclastic units and facies provide useful tool for understanding the explosion dynamics and depositional processes on volcanic slopes. The Miocene ca 11,7 Ma old Abaújvár-Telkibánya ignimbrite representing the last pyroclastic accumulation event around Telkibánya Lava Dome Field in the...
Conference Paper
Full-text available
Calc-alkaline felsic extrusive lava domes could form fields of dispersed monogenetic volcanic forms similar as the alkali basalt volcanic areas. The Telkibánya Lava Dome Field (TLDF) evolved at the northern part of the Tokaj – Slanske Mountains Miocene back-arc system in the Carpathian volcanic arc. The subarerial lava dome and flow complex connect...
Conference Paper
Geoheritage is a generic but descriptive term applied to sites or areas of geologic features with significant scientific, educational, cultural, or aesthetic value. The old millstone quarry of Megyer Hill (Tokaj Mountains, Northeast-Hungary) is situated at the UNESCO World Heritage site of Tokaj Wine Region Historical Cultural Landscape. The pictur...
Conference Paper
Full-text available
Transcarpathia is a political-geographical entity in the northeastern part of the Carpathian Basin, and at the same time it is the most western region of Ukraine. Some 13% of the 12 800 km2 area consists of magmatic formations that belong to several larger and smaller volcanic structures. Despite the number of publications, maps and databases deali...
Chapter
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In the Sárospatak region of the Tokaj Mountains, Northeast-Hungary, thick Badenian ash flow deposits accumulated in submarine settings and later uplifted and suffered intensive hydrothermal alterations. The semi-circular range of Megyer and Király Hills was formed by differential weathering and selective erosion of rocks in the intensely altered an...
Article
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Great mass of calc-alkaline rhyodacite-rhyolitic volcanic rocks (~100 km3) developed during Neogene silicic volcanism (Badenian-Pannonian) in the Carpathian-Pannonian region. The major surface occurences are situated in the Tokaj-Slanské Vrchy Mountains (Hungary-Slovakia), Beregovo Hills (Zakarpattia Oblast, Ukraine), Avas (Oas, Romania). Due to th...
Conference Paper
Full-text available
Telkibánya Lava Dome Field (TLDF) was evolved at the northern part of the Tokaj – Slanske Mountains in the Carpathian Volcanic Arc. The subaerial lava dome and flow complex connected to a long lived (13,9-11,2 Ma) silicic reservoir and multi cycle caldera structure as the youngest silicic event between 11,7 to 11,2 Ma. The proximal and distal litho...
Conference Paper
Full-text available
The 221 m high, island-like Sarmatian age Kaszony hill emerge from the fluvial and aeolian erosion formed surface of the Bereg Plain along the Ukrainian border. The rocks were defined as rhyolite in the previous research. Based on our volcanological and petrographic studies the hill is remain of a strongly welded ignimbrite flow with characteristic...
Article
Full-text available
Comparative analysis of subareal dome and lava flow activity could have been carried out in the Telkibánya acid palaeo-volcanic field. The composite (Cser Hill) or monogenetic (Ó-Gönc, Ork Hills) character and the relative erosion scale of the forms were determined on the basis of facies successions. The survey verified an acid palaeo-flow structur...
Article
Full-text available
A detailed stratigraphic and facies reconstruction of a bentonitized acid-tuff succession, deposited within the transgressive systems tract of the Upper Miocene – Sarmatian Ser-3 eustatic cycle, at Sajóbábony, northern Hungary, was performed via petrographic, mineralogical and geochemical analyses. The purpose of the work was to analyze the degree...
Article
Full-text available
Abaújszántó is a classical locality of the Sarmatian - Pannonian facies rich acid volcanism investigated for a long time at the Western side of the Tokaj-mountains. The tuffs and lavas of the multi-phased renewed explosions and extrusions were developed in thicknesses of several hundred meters. The youngest rhyolites of the mountains form the peak...

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Projects

Projects (4)
Project
Multiple generation of high silica lava domes emplaced in the Tokaj Mountains (Carpathian.Pannonian Region) during the Middle-Late Miocene. Various structural levels exposed by erosion providing cross section view of the distal, medial and proximal lithofacies associations. The procejct aims are revealing facies architectures of the extended silicic dome fields comparing the internal structure and textural characteristics between the edifices of ancient and modern volcanic environments.
Project
Survey of valuable geosites, risk assasment, geotouristic management and evaluation of hungarian geosites.
Project
Land use changes, land abandonment and land use intensification has considerable effects on the soils physical and chemical properties. Changeing of cultivation technics, conversation of land cover and land use, changeing to machinery cultivation and preparation of plantations and soil sealing can also affect the diagnostic features of soil, and therefore lead to change of soils taxonomic status. In this project we study typical and extent present and past land use changes of Hungary in order to study how far they affected soil properties and soil taxonomical status.