Brunovistulian terrane (Bohemian Massif, Central Europe) from late Proterozoic to late Paleozoic: a review

Abstract

The Brunovistulian terrane represents a microcontinent of enigmatic Proterozoic provenance that was located at the southern margin of Baltica in the early Paleozoic. During the Variscan orogeny, it represented the lower plate at the southern margin of Laurussia, involved in the collision with the Armorican terrane assemblage. In this respect, it resembles the Avalonian terrane in the west and the Istanbul Zone in the east. There is a growing evidence about the presence of a Devonian back-arc at the margin of the Brunovistulian terrane. The early Variscan phase was characterized by the formation of Devonian extensional basins with the within-plate volcanic activity and formation of narrow segments of oceanic crust. The oldest Viséan flysch of the Rheic/Rhenohercynian remnant basin (Protivanov, Andelska Hora and Horní Benesov formations) forms the highest allochthonous units and contains, together with slices of Silurian Bohemian facies, clastic micas from early Paleozoic crystalline rocks that are presumably derived from terranes of Armorican affinity although provenance from an active Brunovistulian margin cannot be fully excluded either. The development of the Moravo-Silesian late Paleozoic basin was terminated by coal-bearing paralic and limnic sediments. The progressive Carboniferous stacking of nappes and their impingement on the Laurussian foreland led to crustal thickening and shortening and a number of distinct deformational and folding events. The postorogenic extension led to the formation of the terminal Carboniferous-early Permian Boskovice Graben located in the eastern part of the Brunovistulian terrane, in front of the crystalline nappes. The highest, allochthonous westernmost flysch units, locally with the basal slices of the Devonian and Silurian rocks thrusted over the Silesicum in the NW part of the Brunovistulian terrane, may share a similar tectonic position with the Giessen-Harz nappes. The Silesicum represents the outermost margin of the Brunovistulian terrane with many features in common with the Northern Phyllite Zone at the Avalonia-Armorica interface in Germany.

Sedimentological study of the Nikolčice Formation - evidence of the Middle Jurassic transgression onto the Bohemian Massif (subsurface data)

“…How ever, as the li thol ogy of these two units is very sim i lar, it is lo cally dif fi cult to dis tin guish be tween them with out micropalaeontological in for ma tion. Dur ing the Mid dle De vonian, the clastic sed i men ta tion was suc ceeded by shelf car bonate de po si tion (Moravian Karst Fa cies), which con tin ued to the ear li est Penn syl va nian (Tournaisian, lower part of the Visean) (Kalvoda et al, 2008). This se quence was sub se quently overthrust by the Penn syl va nian Culmian fa cies flysch wedge dur ing Variscan oro gen esis (Cizek and Tomek, 1991).…”

Coal-bearing capacity of the Petřkovice Member (Ostrava Formation, Serpukhovian, Mississippian) of the Upper Silesian Basin (Czech Republic and Poland)

“…Cam brian, Or do vi cian, De vo nian and Mis sissip pian strata have been iden ti fied in the sed i men tary en ve lope of the Brunovistulicum (Kalvoda et al, 2008;Bu³a et al, 2015). Car bon if er ous sed i men ta tion be gan with pre-orogenic car bonates.…”

U-Pb zircon age of the Krásné Loučky tuffite: the dating of Visean flysch in the Moravo-Silesian Paleozoic Basin (Rhenohercynian Zone, Czech Republic)

“…The ba sin is filled by some of the youn ger de pos its over lying Brunovistulicum (Bu³a and ¯aba, 2005;Kalvoda et al, 2008). De vo nian sed i men ta tion started with pre-flysch car bonates (Bábek et al, 2007) and con tin ued into the ma rine clastic sed i ments of the Car bon if er ous flysch (Kumpera, 1983;Dvoøák, 1994).…”