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- W4381952845 endingPage "377" @default.
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- W4381952845 abstract "The Variscan Bohemian Massif reveals evidence for two oceans. The Saxo-Thuringian basin separated the microcontinents Franconia-Thuringia (N-Armorica) and Bohemia (S-Armorica), is unrelated to the Rheic and records Cambrian to early Ordovician rifting and Silurian/early Devonian drift. Allochthonous flysch sediments record onset of convergence (Late Frasnian), and flysch onlap on the passive margin (early Famennian). A felsic tuff near the base of the autochthonous flysch has yielded a U-Pb TIMS age of 333.4 ±0.6 Ma (late Asbian). It corresponds to the emplacement and cooling of (U)HP rocks in the Saxo-Thuringian Erzgebirge and Granulite antiforms, thus confirming extrusion of the high-grade rocks from the asthenospheric mantle into the upper crust of the foreland. Subsequent folding and thrusting relate to dextral, oblique collision. An alleged mid-Viséan phase of constriction is discarded. The northern part of Bohemia sourced the Saxo-Thuringian flysch, but shows no evidence of high elevations. The southern (Barrandian) part remained close to sea-level from the Cambrian to early Carboniferous. Granulite facies metamorphism (340 Ma), thermal anomalies during deformation of the foreland (c. 330 Ma), granite intrusion and Ar-loss in sheet silicates (325 to 275 Ma) relate to the plume-generation zone “TUZO” active under Europe. The Moldanubian zone with its (U)HP metamorphic rocks represents subducted and exhumed fill of a separate, Galicia-Moldanubian basin. Models interpreting the Moldanubian as subducted Saxo-Thuringian rocks exhumed in the rear of the Teplá-Barrandian can be discarded by elementary considerations. Re-evaluation of tectono-stratigraphic units confirms that the German Saxo-Thuringian is linked with the Polish West Sudetes by the Bohemian orocline, which formed by the molding of Armorican terranes into an embayment defined by the margins of Avalonia and Baltica. The plate-tectonic paths of the Bruno-Vistulian and related terranes (TETA) remains controversial. Relations of the Moldanubian Thrust with the ENE-trending East-Variscan Shear Zone of the Alps are discussed." @default.
- W4381952845 created "2023-06-26" @default.
- W4381952845 creator A5009693865 @default.
- W4381952845 creator A5070260854 @default.
- W4381952845 date "2023-12-01" @default.
- W4381952845 modified "2023-10-17" @default.
- W4381952845 title "Variscan evolution of the Bohemian Massif (Central Europe): Fiction, facts and problems" @default.
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