Geological features, geophysical measurements and interpretation at the Telkibánya research area

A lot of geophysical measurements (gravity, geomagnetic, geoelectric, airborne magnetic and radiometric) were carried out in the Tokaj Mountains in the 60’s. They covered partly the Northern part of the Tokaj Mountains, the Telkibánya area too. Later, in 1997 detailed airborne magnetic and radiometric measurements covered the ore perspective part of the Telkibánya area. The well-known surface geology of the Telkibánya volcanic structure allows the interpretation of different geophysical data as indicating volcanic bodies, secondary alterations of volcanic formations and hydrothermal processes. There was only local field geophysical work on the area without a summary program of different time and different kind geophysical exploration works. The biggest one was the paleovolcanic reconstruction of the Tokaj Mountains financed by Hungarian Scientific Research Found (OTKA-022769). Unfortunately the Telkibánya area is located near the state boundary, which was a spatial limit of the old airborne surveys. Now, in this paper we summarize the results of geophysical interpretations of field gravity, airborne magnetic and radiometric data

Paleomagnetic correlation of Miocene pyroclastics of the Bükk Mts and their forelands

Abstract Paleomagnetic measurements were carried out on 163 independently oriented samples from 19 sites of the Bükk Mts and their northern, western and southern forelands. The aim was to correlate the sites with one of three Miocene rhyolite tuff horizons using the combination of paleomagnetic marker horizons (rotational events) and traditional magnetostratigraphy. In contrast to the results of earlier studies in the southern Bükk foreland, which yielded only reversed polarity magnetizations, nearly half of the presently obtained paleomagnetic directions are of normal polarity. By their declinations they mostly belong to the middle tuff horizon, and only one belongs to the upper. The paleomagnetic age assignment of the studied sites sometimes supports one or both of the classifications of Balogh (1964) and Pelikán et al. (2005). However, about one-third of the sites classified by these authors as upper or lower tuffs were shown to belong to the middle tuff complex

Az ÉK-magyarországi paleozoikum és mezozoikum dinári-hellenid korrelációja = Dinaridic-Hellenidic correlation of the Paleozoic and Mesozoic of NE Hungary

Elkészültek A Cirkum-Pannon régió tektonosztratigráfiai térképeinek magyarázó fejezetei, amelyek a XVIII. Kárpát-Balkán Geológiai Kongresszuson (Belgrád, 2006) lettek bemutatva. Elkészült a Darnói komplexum és a Recsk-mélyszint újraértékelése és térképe, valamint előzetes korreláció a Belső-Dinaridák és Belső-Hellenidák irányában, szerb és görög együttműködésben; utóbbiban új tektonikai modellek vetődtek fel a Bükk-hegységben. Jelentősen előre haladt a Rudabányai-hegység középső részének szerkezeti és júra megismerése, elkészült a nem metamorf aggtelek-rudabányai egységek szerkezeti kersztszelvénye az országhatártól Szalonnáig. | Explanatory chapters of the Circum-Pannonian tectonostratigraphic terrane map series have been prepared for printing; they were presented at the XVIIIth Carpato-Balkan Geological Congress (Belgrade, 2006). The Darnó Complex and the pre-Tertiary basement of the Recsk Paleogene ore-field have been revised, the new geological map of the Darnó area have been prepared. Preliminary correlation with the Inner Hellenides - Inner Dinarides has been made and in Greek cooperation a partly new tectonic model was elaborated for the Bükk Mts. Knowledge on the structure and Jurassic stratigraphy oh the middle part of the Rudabánya Mts. has been significantly increased. Structural cross-section of the non-metamorphosed units of Aggtelek-Rudabánya Mts. (from the state border to the SE margin) has been prepared for printing

Paleovolcanic reconstruction in the Tokaj Mountains

The Tokaj Mts, situated in the northeastern part of the inner arc of the Carpathians, forms a part of a Miocene calc-alkaline andesitic-dacitic-rhyolitic volcanic island arc. The ancient volcanic structures were reconstructed on the basis of the 1:50 000-scale and 22 sheets of the 1:25 000-scale geologicpetrologic maps, as well as the revision of the volcanic facies in 150 boreholes. Multispectral and SAR satellite imagery, aerial photos, data and maps of airborne geophysical surveys (magnetic and radiometric), gravity-filtered anomaly maps, geochemical (soil and stream sediment Au, As, Sb, Hg) concentration distribution maps and the K/Ar dating of 132 samples from 80 paleomagnetic measurements were also used. The anomalies were only taken into consideration in the interpretation if the coincident results of at least 3 methods indicated the presence of any volcanic structure. In consequence, 91 map-scale volcanic structures were identified by morphology - complex calderas, single lava domes, volcanic fissures, subvolcanic intrusions, diatremes, stratovolcanoes and postvolcanic formations. Conclusions were also drawn regarding the link to the volcanic structures and prospective occurrences of the mineral resources of the Tokaj Mts: andesite, dacite, welded zeolitic tuff, K-metasomatite, perlite, pitchstone, pumice, bentonitic, illitic, kaolinitic, diatom- bearing and silicified lacustrine sediments, hydrothermal Au-Ag and Pb-Zn veins, and Hg stockwerks

Miocene volcanism of the Cserhat Mts (N Hungary): Integrated volcano-tectonic, geochronologic and petrochemical study

New K/Ar ages and paleomagnetic data connected with volcano-tectonic observations detected three intermediate (andesitic) and three acidic (dacitic-rhyolitic) magmatic phases. Cserhát magmatic activity occurred between 21-12 Ma. The timing of the initial and final acidic and intermediate phases may be connected with the Mátra volcano situated to the east. During the Badenian (15-14 Ma) the volcano-tectonic evolution was relatively independent in the Cserhát Mts. The third acidic and intermediate volcanic phases, which developed in the Lower Sarmatian, show similar features as the final phases of the Mátra volcano. Based on the major and trace element geochemistry the acidic rocks result from partial melting of the lower crust. Most of the intermediate volcanic rocks were generated from a rather homogeneous fluid-modified source (lithospheric), as triggered by an important heat transfer event. Initial melts sometimes experienced mixing or contamination in the lower or upper crust. This was a period of strong extensive tectonics. The rock of the second and third intermediate phases suggests minor fractional crystallization in the intermediary magma chamber(s)