WHERE DO THE ALPS' FOOTHILLS END? THE DEPTHS OF THE PRE-CENOZOIC BASEMENT IN THE FOREGROUND OF VAS-HEGY– ALPOKALJA, WESTERN HUNGARY

BERECZKI LÁSZLÓ¹ , GÄRTNER DÉNES¹, KEMÉNY MÁRTON¹, PÉNTEK ANDRÁS¹, KOVÁCS GÁBOR¹, TIMÁR GÁBOR¹, MOLNÁR GÁBOR ², SZÉKELY BALÁZS<sup>1,3

 1</sup> Eötvös Loránd University, Department of Geophysics and Space Science
² Geological, Geophysical and Space Science Reasearch Group of the Hungarian Academy of Sciences, Eötvös University, Budapest, Hungary
³ Research Groups Photogrammetry and Remote Sensing, Department of Geodesy and Geoinformation, Vienna University of Technology, Vienna, Austria
 

In the past three decades numerous researches have been published containing maps describing basement morphology. The first basement interpretations were based on the correlation of borehole data, then in the ’80s further seismic surveys offered the possibility to refine the outcomes. We collected and compared these data – by following a geoinformatical approach - and integrated them during the preparation stage of the measurement obtained in the 2012 field trip of Eötvös Loránd University, Department of Geophysics and Space Science. By summing up all the data we are able to create a more accurate Pre-Cenozioc basemap of the studied area. The map covers approx. 300 km2 area in the west of Hungary, between the national border and Szombathely, in the eastern foreground of Vas-hegy. We compared five basemaps (KILENYI & RUMPLER 1984, FLÜGEL 1988, KILÉNYI & ŠEFARA 1989, DANK & FÜLÖP 1990, HASS et al. 2010), two magnetic (HOFFER 1960, FANCSIK et al. 2006), a Bouguer-anomaly map (FANCSIK et al. 2005) and torsion balance anomaly map (VAJK 1938). Apparently, by this comparison we can see that the depth of Pre-Cenozoic basement is interpreted in different ways in each article. In contradictory and information deficient areas an attempt was made to produce supplement data with seismic and magnetic measurements. Eventually, a refined Pre-Cenozoic basemap of the area has been created with the help of our complementing measurements, the old maps and more than twenty boreholes reaching basement. Our results revealed an eastern foothill buried under the surface, although the saddle morphology is unlikely. The model contains a basement with fairly steady slope based on industrial sesmic surveys, our results doubt its hole-like feature.

FULL TEXT

© Academia Romana - Filiala Cluj Colectivul de Geografie

Design by Bilasco Stefan