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Geological Society, London, Special Publications; 2000; v. 179; p. 131-153;
DOI: 10.1144/GSL.SP.2000.179.01.10
© 2000 Geological Society of London

From Cadomian subduction to Early Palaeozoic rifting: the evolution of Saxo-Thuringia at the margin of Gondwana in the light of single zircon geochronology and basin development (Central European Variscides, Germany)

U. Linnemann1, M. Gehmlich2, M. Tichomirowa2, B. Buschmann2, L. Nasdala2, P. Jonas2, H. Lützner3 & K. Bombach2

1 State Museum of Mineralogy and Geology Dresden, Research Centre, A.B. Meyer-Bau, Königsbrücker Landstrasse 159, Dresden, D-01109, Germany linnemann{at}snsd.de
2 Mining Academy Freiberg, Institute of Mineralogy, Werner-Bau, Brennhausgasse 14, Freiberg, D-09596, Germany
3 Friedrich-Schiller-University Jena, Institute of Geosciences, Burgweg 11, Jena, D-07749, Germany

Saxo-Thuringia is classified as a tectonostratigraphic terrane belonging to the Armorican Terrane Collage (Cadomia). As a former part of the Avalonian-Cadomian Orogenic Belt, it became (after Cadomian orogenic events, rift-related Cambro-Ordovician geodynamic processes and a northward drift within Late Ordovician to Early Silurian times), during Late Devonian to Early Carboniferous continent-continent collision, a part of the Central European Variscides. By making use of single zircon geochronology, geochemistry and basin analysis, geological processes were reconstructed from latest Neoproterozoic to Ordovician time: (1) 660–540 Ma: subduction, back-arc sedimentation and tectonomagmatic activity in a Cadomian continental island-arc setting marginal to Gondwana; (2) 540 Ma: obduction and deformation of the island arc and marginal basins; (3) 540–530 Ma: widespread plutonism related to the obduction-related Cadomian heating event and crustal extension; (4) 530–500 Ma: transform margin regime connected with strike-slip generated formation of Early to Mid-Cambrian pull-apart basins; (5) 500–490 Ma: Late Cambrian uplift and formation of a chemical weathering crust; (6) 490–470 Ma: Ordovician rift setting with related sedimentation regime and intense igneous activity; (7) 440–435 Ma: division from Gondwana and start of northward drift. The West African and the Amazonian Cratons of Gondwana, as well as parts of Brittany, were singled out by a study of inherited and detrital zircons as potential source areas in the hinterland of Saxo-Thuringia.





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