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Characterization of perlites from Jastrabá and Lehôtka pod Brehmi deposits

Varga P., Lexa J., Uhlik P., Rajnoha M.

Geology, Geophysics and Environment

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2015

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Vol. 41, no. 1

146

EN

Perlite is an important industrial mineral with unique properties. It is an acid volcanic glass (rhyolitic or rhyodacitic) with a water content between 1 to 5%. The largest industrial use is in the form of expanded pearlite. This produced by rapidly heated, grinded natural perlite at 600–900°C (Barker & Santini 2006). Perlite occurrences represent economic accumulation in Slovakia. Perlite is mined at the Lehôtka pod Brehmi deposit for a long time and now is starting to open Jastrabá deposit. The aim of this paper is characterization and correlation of samples of both deposits and samples from locality Szabova skala due to their different genesis. The perlite from Lehôtka pod Brehmi deposit has been characterized by X-ray powder diffraction, IR spectroscopy and thermal analysis in the current research (Uhlík et al. 2014). Any significant differences were not identified in the content of volcanic glass, crystalline phases, or content of water. Only one differences have been observed in the macroscopically different perlite glasses (color, texture) – porosity. The macroscopically (color, texture) of different perlite glasses differences were once in porosity. The purpose of this article is to characterize the perlite sample by optical microscopy, X-ray powder diffraction and microprobe analysis. The characterization of perlitic glass is important not only for the mining company because of heterogeneity of Lehôtka pod Brehmi deposit, but also from a scientific point of view and about 30-years gap of perlite studies in the Central Slovakian Volcanic Field (Capková 1976, Kraus et al. 1980, 1985, Zuberec et al. 1980, 1983).

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Use of geodetic information in seismology

Varga P., Bus Z., Gribovszki K.

Reports on Geodesy

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2006

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z. 4/79

375-380

EN

The study of the displacement fields of the Earth surface can be useful in the study of the properties of the past and future potential earthquakes. With the use ofKostrov equation (1974) the possible sum of seismic moments can be estimated for a given source zone, if its area is described with the use of geodetic measurements. The possible displacement fields connected with seismo-tectonic activity for the intraplate part of Central Europe should be estimated with the use of model calculations. The necessity of such a theoretical work is connected with the very long return period of destroying events (M> 6.5) of this region.

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Use of geodetic information in seismology

Varga P., Bus Z., Gribovszki K.

Reports on Geodesy

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2005

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z. 2/73

61-66

EN

The study of the displacement fields of the Earth surface can be useful in the study of the properties of the past and future potential earthquakes. With the use of Kostrov equation (1974) the possible sum of seismic moments can be estimated for a given source zone, if its area is described with the use of geodetic measurements. The possible displacement fields connected with seismo-tectonic activity for the intraplate part of Central Europe should be estimated with the use of model calculations. The necessity of such a theoretical works is connected with the very long returnperiod of destroying events (M>6.5) of this region.

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Strain rates, seismic activity and its temporal variations within the Pannonian Basin

Varga P., Bus Z., Kiszely M.

Reports on Geodesy

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2004

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nr 2/69

149--156

EN

The spatio-temporal patterns are used for the study of the intraplate seismicity of the Pannonian basin. The earthquake occurrence is connected to the strain rate values with the use of the Kostrov(1974) equation. It is shown that in the Pannonian basin the seismic rates are l0-7-l0-6. These values were derived from the local earthquake catalogues of the area of Komarom, Dunaharaszti (near Budapest) and Kecskemet. The method used in present study is based on combination of seismological and geodetic tools and it can be used in the future for the study of the seismic conditions of areas with reduced earthquake activity.