Role paleonapětí a zděděných struktur podloží ve vývoji oherského riftu ve světle analogového modelování

Havlíček, Filip

In the initial stages of their development, continental rifts are often influenced by pre-existing mechanical heterogeneities in the extending crust which can affect many aspects of the rift structure. The Cenozoic Eger Graben (EG), NW Bohemian Massif, is an example of a fossil rift structure where the issue of inheritance has been relatively underexplored. This work was focused on how interactions of inherited structures in the basement of the Bohemian Massif resulting from its prior complex deformational history may have influenced the evolution of syn-rift fault populations. Especially considering a two-phase extensional history (N-S followed by NW-SE stretching) which was proposed by earlier authors. The primary methodical approach was the use of scaled analog models. In order to design suitable model scenarios relevant to a natural prototype, a sufficiently detailed knowledge of the structural framework in the given region has to be obtained. This was done through a review of published research as well as by field structural mapping of selected areas of the EG where pre-rift units are exposed. Crustal scale brittle-viscous analog modeling was performed using two basic setups. Setup 1, focused on effects of varying direction of extension in time, using the edge of a mobile base plate to...

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