Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)

Results of geophysical survey between the mountains Luční hora and Studniční hora in the Krkonoše Mountains

 

Jiří Dohnal, Igor Dvořák, Zdeněk Jáně, Jan Vilhelm

Geoscience Research Reports 38, 2005 (GRR for 2004), pages 120–123
Map sheets: Trutnov (03-42)

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Abstract

Within the framework of the project "The complex analysis of the long term changes of the Krkonoše tundra" complex geophysical research has been conducted in the Krkonoše area since 2000. In the year 2004 the main part of the exploration consisted in geophysical survey in the area of the mountains Luční hora and Studniční hora in eastern part of the Krkonoše (the Giant Mountains). The aim of the survey was partly to prove the presence of an inferred fault-system in the saddle Modré sedlo, partly to find out the bedrock topography in the site of cryoplanation terraces on the mountain Luční hora. An area of 600 x 240 m situated in the saddle between two above mentioned mountains was explored in a grid 80 x 10 m by means of pole-dipole, dipole-pole resistivity method and VLF-method. Shallow seismic refraction was applied on a profile situated on the Luční hora mountain slope. The locality lies within the Krkonoše-Jizera Crystalline Complex and its bedrock is formed by muscovite-albite phyllite to micaschist with a thick quartzite layer. The geophysical research in the saddle Modré sedlo proved the presence of two tectonic faults crossing the saddle in the N-S direction and associated with "low" resistivity area. These tectonic features are probably the main cause of the saddle Modré sedlo morphology. Seismic refraction in the site of cryoplanation terraces showed the topography conformity of the bedrock and the ground space. It suggests the importance of bedrock lithology in the cryoplanation terraces evolution.