Tectonic evaluation of borehole PTP-3 in the Krušné hory Mts. with ImaGeo mobile corescanner

 

Authors: Maros G, Palotás K, Koroknai B, Sallay E

Published in: Bulletin of Geosciences, volume 77, issue 2; pages: 105 - 112; Received 25 February 2002; Accepted in revised form 30 April 2002;

Keywords: granite, tectonic control, fracture zones, foliation, alteration, geometry, stress, borehole, corescanning, Krušné hory Mts., Bohemian Massif,

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Abstract

In the winter of 2000 borehole PTP-3 in the Krušné hory Mts. was drilled. The borehole was measured with acoustic borehole televiewer and the core was scanned with the ImaGeo mobile corescanner. As a result of combining these two methods the oriented distribution of the different geological phenomena, especially the fractures cutting the core, could be determined as well as two theoretical paleostress field systems (one with a NE-SW and one with a NW-SE main stress direction). The fracture frequency in the borehole was very low (3.04 fractures per metre) so the evaluated granite body cannot be termed as a fractured one but still a remarkable fracture pattern was found in the borehole and separate 'fracture zones' could be distinguished.