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

Is there any alternative to the F. E. Suess’s famous nappe theory?


Petr Batík

Geoscience Research Reports 36, 2003 (GRR for 2002), pages 11–16

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An alternative to the classical F. E. Suess's theory is presented for the Svratka Dome, based on the investigation of the Thaya Dome (BATÍK 1999). Position of nappe shear planes and timing of nappe displacement are considered to be the main week points of Suess's conception. Author of this article offers an alternative solution for this fundamental geological problem: The Svratka Dome formed by Proterozoic granitic rock and its roof pendant (Moravicum), is a product of Cadomian orogenic phase. After Early Paleozoic erosion, Early Devonian clastic sediments were deposited, overlain by siliciclastic and carbonate Devonian deposits and Early Carboniferous (Culmian) greywackes. During Variscan orogeny in the Upper Carboniferous and Permian, Moldanubicum was thrust over the Svratka Dome from the west. Subsequent shearing with eastern vergency terminated the Variscan phase. This phase resulted in a formation of close-joint cleavage and minor deformation of the basement. Last deformation, with shearing of western vergency, occurred during the Alpine-Carpathian orogeny and affected the Svratka Dome together with a crystalline complex situated to the east of the Boskovice Graben.