Terranes and terrane boundaries in the Sudetes, northeast Bohemian Massif

Abstract

In the Sudetes, seven distinct lithostratigraphic terranes exhibit a symmetric distribution. A central region of basinal/oceanic and ophiolitic rocks, the Central Sudetic terrane is bordered, respectively to the northwest and southeast, by the sialic Saxothuringian and Moldanubian terranes. These exhibit contrasting metasedimentary/metavolcanic successions and tectonic-metamorphic sequences, but both are characterized by Palaeozoic plutonism. These are in turn bordered (again respectively to the northwest and southeast) by the Lusatian and Moravian terranes, which are also sialic, but contain Cadomian granitoids and represent rifted and now widely separated fragments of Gondwana. Along the southwestern flank of the Sudetes, the Barrandian terrane, largely covered by younger sediments, extends to the southwestern margin of the Bohemian Massif. The Sowie Góry terrane forms a klippe of high grade gneisses tectonically emplaced on top of low-grade, sheared ophiolites of the Central Sudetic terrane. The Sowie Góry terrane exhibits a history of three distinct, probably multi-orogenic, regional metamorphic events: an early high-pressure granulite/eclogite metamorphism followed by medium- to low-pressure granulite, and in turn by amphibolite facies metamorphism. All the terrane boundaries are complex zones of ductile to brittle shearing, modified by later brittle movements. Some, such as the Leszczyniec shear zone, mark lines of old, pre-Variscan rift and suture zones, reactivated and overprinted during a series of Variscan ductile to brittle events of extensional shearing with related metamorphism and plutonism.

Variscan granitoid plutonism in the Strzelin Massif (SW Poland): petrology and age of the composite Strzelin granite intrusion

“…The lo ca tion, ex tent and corre la tions of the ma jor tectono-strati graphic zones of the Variscan Belt (or "ter ranes" of Matte et al, 1990, that be long to the Armori can Terrane As sem blage of Franke, 2000), i.e. Moldanubian, Saxothuringian (Kossmat, 1927) and Teplá-Barrandian (Franke, 1989(Franke, , 2012 zones, in the West and Central Sudetes is still a mat ter of dis cus sion (e.g., Franke et al, 1993;Cymerman and Piasecki, 1994;Cymerman et al, 1997;¯elaŸniewicz, 2000, 2002;Aleksandrowski and Mazur, 2002).…”

Devonian deep-crustal metamorphism and exhumation in the Variscan Orogen: evidence from SHRIMP zircon ages from the HT-HP granulites and migmatites of the Góry Sowie (Polish Sudetes)

“…1; for regional geological context see [21][22][23][24]). It comprises high-grade metamorphic rocks, mainly gneisses and migmatites, with minor inliers of granulites and garnet meta-peridotites.…”

“Granite tectonics” revisited: insights from comparison of K-feldspar shape-fabric, anisotropy of magnetic susceptibility (AMS), and brittle fractures in the Jizera granite, Bohemian Massif

“…The tectonic evolution of the area is thought to involve early subduction (Maluski and Patočka 1997;Patočka and Pin 2005), followed by collision and nappe stacking, strike-slip faulting, and late extension during the Variscan orogeny (for reviews and further information see Aleksandrowski et al 1997Aleksandrowski et al , 2000Aleksandrowski and Mazur 2002;Cymerman et al 1997;Hladil et al 2003;Marheine et al 2002;Mazur 2002;Mazur and Aleksandrowski 2001;Mazur et al 2006;Werner et al 2000;Winchester et al 2003;Zelazniewicz 1997).…”