The Evolution of the Rheic Ocean: From Avalonian-Cadomian Active Margin to Alleghenian-Variscan Collision

The Lausitz graywackes, Saxo-Thuringia, Germany—Witness to the Cadomian orogeny
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Published:January 01, 2007
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CiteCitation
Helga Kemnitz, 2007. "The Lausitz graywackes, Saxo-Thuringia, Germany—Witness to the Cadomian orogeny", The Evolution of the Rheic Ocean: From Avalonian-Cadomian Active Margin to Alleghenian-Variscan Collision, Ulf Linnemann, R. Damian Nance, Petr Kraft, Gernold Zulauf
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The Lausitz Group in the easternmost part of Saxo-Thuringia, Germany, forms the largest exposure of partly anchimetamorphic Cadomian basement in Germany. In common with adjoining units to the west, it was deposited in a convergent-margin basin of northern peri-Gondwana. Sedimentary features within the turbiditic graywacke successions suggest continuous accumulation during a deepening stage that followed basaltic-andesitic arc-volcanic activity. The turbidites are irregularly intercalated with tuffaceous graywacke, which was derived from reworked, but only slightly older, basic volcanic material. Petrological and geochemical data reveal a broadly uniform source area for the graywackes with a dissected magmatic arc signature containing exhumed pre-Cadomian basement. Graywackes of the Lausitz Group together with earlier Cadomian basin successions and parts of the pre-Cadomian basement became mobilized during Cadomian subduction-related anatexis. During basin closure, the graywackes were weakly folded with a northerly vergence. Subsequently, they were contact-metamorphic overprinted by granodioritic intrusions, which mark the end of the Cadomian orogeny and show both Cadomian and pre-Cadomian crustal signatures. Superimposed very low-grade S-C textures in gray-wackes of the eastern Lausitz area are due to Variscan processes.
- anatexis
- Cadomian Orogeny
- Cambrian
- Central Europe
- clastic rocks
- depositional environment
- Europe
- geochemistry
- Germany
- Gondwana
- granodiorites
- graywacke
- igneous rocks
- intrusions
- Lower Cambrian
- major elements
- metagraywacke
- metamorphic rocks
- metasedimentary rocks
- orogeny
- paleoenvironment
- Paleozoic
- petrology
- plate tectonics
- plutonic rocks
- provenance
- Saxony-Thuringia
- Saxothuringian
- sedimentary rocks
- sedimentation
- subduction
- tectonics
- trace elements
- turbidite
- Variscan Orogeny
- Lausitz Group