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Evolution of paleostress fields and brittle deformation in Hronov-Poříčí Fault Zone, Bohemian Massif

Research paper by Lucie Nováková

Indexed on: 10 Feb '14Published on: 10 Feb '14Published in: Studia Geophysica et Geodaetica



Abstract

This paper investigates the tectonic history and describes the paleostress evolution of the Hronov-Poříčí Fault Zone in the northeastern part of the Bohemian Massif. A detailed structural research has been carried out in 50 localities. Faults and fractures have been investigated and measured. An analysis of the fault-slip data within the studied area resulted in the identification of four tectonic phases. The maximum principal stress was observed to be acting NE-SW during the first and youngest phase. The trend of the horizontal compression runs at 223° in the horizontal plane perpendicular to the reverse faults occurring in this phase, as well as to the studied fault zone. The minimum principal stress was found to be subvertical dipping at 87° and trending at 358°. Both the brittle tectonic investigations and paleostress analysis have documented that, at present, the Hronov-Poříčí Fault Zone is under compressive regime with dextral component.