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| Saxothuringian | |
|---|---|
| Name | Saxothuringian |
| Type | Orogenic domain |
| Region | Central Europe |
| Countries | Germany, France, Switzerland, Czech Republic, Austria |
| Period | Variscan Orogeny (late Palaeozoic) |
| Lithology | metamorphic rocks, granitoids, sedimentary sequences |
| Namedfor | Saxony, Thuringia |
Saxothuringian
The Saxothuringian is an orogenic domain of Central Europe associated with the late Palaeozoic Variscan Orogeny and recognized across parts of Germany, France, Switzerland, the Czech Republic, and Austria. It comprises a mosaic of metamorphic nappes, sedimentary basins, and granitoid intrusions that record interactions between terranes and continental plates including the microcontinents involved in collisions that produced the Rheic Ocean closure and formation of the Pangaea supercontinent. Studies of the domain integrate data from field mapping in the Harz Mountains, Thuringian Forest, and Massif Central with geochronology from laboratories at institutions such as the Deutsches Geoforschungszentrum and the Institut de Physique du Globe de Paris.
The name derives from the historical regions of Saxony and Thuringia and was adopted in geological literature that followed earlier regional syntheses by geologists like Eduard Suess, Alfred Wegener, and Friedrich August von Alberti. Terminology was standardized in stratigraphic compilations by the Geological Society of London and in regional maps produced by the Bayerisches Landesamt für Umwelt and the Bundesanstalt für Geowissenschaften und Rohstoffe.
The Saxothuringian domain occupies a belt between the Rhenohercynian Zone to the northwest and the Moldanubian Zone to the southeast, extending from the Massif Armoricain and Massif Central across the Rhine Massif and into the Bohemian Massif. Key exposures occur in the Harz Mountains, Kellerwald, Thuringian Forest, Fichtelgebirge, and parts of the Vosges and Jura Mountains. The domain interacts with structural units linked to the Alps and the Carpathians, and its limits are constrained by major shear zones like the Saar-Nahe Basin margin and the Black Forest fault systems mapped by the Geological Survey of France and the Swiss Geological Survey.
Stratigraphic successions include Cambrian to Devonian sedimentary sequences, Permian volcanic and sedimentary cover, and extensive crystalline basement. Lithologies encompass schists, phyllites, slates, quartzites, marbles, and carbonate platforms correlated with units such as the Rhenish Massif and the Bohemian Massif sequences. Granitoid intrusions include bodies comparable to the Erzgebirge intrusions and batholiths akin to those in the Massif Central, with ages determined by radiometric techniques at laboratories like the GFZ Potsdam. Detrital and carbonate facies have been correlated with facies elsewhere in Europe by researchers from the University of Göttingen and the Université de Strasbourg.
The tectonic history records rifting related to the opening of the Rheic Ocean, the drift of terranes such as the Armorican Terrane and the Brittany Microcontinent, and subsequent collision events culminating in the Variscan continental assembly. Plate reconstructions invoke interactions among the Laurentia, Avalonia, and Gondwana plates and involve subduction polarity changes documented in structural studies influenced by work at the Max Planck Institute for Meteorology and the ETH Zurich. Major orogenic pulses relate to events recognized in the Cantabrian Mountains and the Iberian Massif, and post-orogenic extensional regimes produced basins like the Saale Basin and influenced magmatism recorded in the Eifel volcanic fields.
Metamorphic grades range from low-grade greenschist and slaty cleavage to amphibolite-facies overprints, with localized high-pressure assemblages analogous to those found in the Moldanubian Zone. Metamorphic ages cluster around the Early to Late Devonian and Carboniferous, with peak metamorphism tied to Variscan collisional phases established by isotopic dating methods such as U–Pb zircon and Ar–Ar mica thermochronology performed at ETH Zurich and Universität Wien. Structural fabrics include fold nappes, thrust systems, and shear zones comparable to structures in the Alps and the Hercynian belt, and kinematic analyses have been advanced by teams at the University of Basel and the University of Freiburg.
Fossil evidence in unmetamorphosed to weakly metamorphosed sequences includes trilobites, graptolites, corals, and brachiopods that permit biostratigraphic correlation with successions in the Rhenish Massif, the Armorican Massif, and the Bohemian Massif. Conodont and brachiopod assemblages provide Silurian–Devonian age constraints similar to those used in studies by the Natural History Museum, London and the Muséum national d'Histoire naturelle. Radiometric constraints from zircon U–Pb dating link magmatic and metamorphic events to chronologies established in the Variscan belt and benchmarked against ages from the Massif Central and the Cantabrian Zone.
The domain hosts mineralization and resources including vein-type base metal deposits, skarn-related ores, and granite-related tin–tungsten mineralization with analogues in the Cornubian Batholith and the Erzgebirge. Historic mining centers in the region have parallels with operations in the Harz Mountains, the Saxony mining districts, and the Jáchymov uranium deposits of the Bohemian Massif. Building stone, dimension stone, and aggregate resources are exploited across the Rhine Massif and Vosges, and geothermal gradients and heat flow anomalies have prompted exploration by institutions such as the German Research Centre for Geosciences and the Swiss Seismological Service.