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Single zircons from two orthogneiss complexes, the 'Grey Gneiss' and 'Red Gneiss', the lowermost tectonic units in the Erzgebirge, were dated. The zircon ages document a distinct late Proterozoic phase of granitoid magmatism, similar in age to granitoids in the Lusatian block farther north-east. However, Palaeozoic deformation as well as medium pressure metamorphism (approx 8 kbar/600-650 degrees C) are identifical in both gneiss units and distinguish these rocks from the Lusatian granitoids. They grey and red gneisses were overthrust by units with abundant high-pressure relicts and a contrasting P-T evolution. -from Authors

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Kroner, A.; Willner, A. P.; Hegner, E.; Frischbutter, A.; Hofmann, J.; Bergner, R. (1995): Latest Precambrian (Cadomian) zircon ages, Nd isotopic systematics and P-T evolution of granitoid orthogneisses of the Erzgebirge, Saxony and Czech Republic. Geologische Rundschau, 84, 3, 437-456.