Abstract
The Bakony Mountains of the Transdanubian Central Range, Hungary, are located in the western part of the Pannonian basin. Their Neogene structure is dominated by right-lateral strike-slip faults, with offsets of up to 5 km. These faults are organized in two sets. The older one, trending WNW, is offset by the younger NW-trending set. Neither set of faults, i.e. the NE-trending left-lateral Rába and Balaton major strike-slip faults, extends across the boundary faults. It is proposed here that the late Miocene structural evolution of the Bakony Mountains can be best explained in terms of multiple block rotation. On the basis of this simple geometric model a 15° counterclockwise rotation is suggested as a working hypothesis for the entire tectonic unit. Previous paleomagnetic measurements conform well to the block rotation predicted by the model. The proposed detachment for the rotated rigid upper-crustal blocks is a regional decoupling surface at an average depth of 10 km. This surface probably emanated from a nappe system of Cretaceous age.
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