Origin and age of Izera gneisses and Rumburk granites in the Western Sudetes

Abstract

The present study concerns petrological, geochemical and geochronological relations between the Rumburk granite and the Izera gneisses in the Western Sudetes. It has been demonstrated that the Izera gneisses are orthoderived; they form, with the granites, a plutonic anorogenic coherent complex of alkaline character. This complex has been affected by a regional Variscan metamorphism dated as post-Famennian and betore 320-310 Myr. Its emplacement between 500 and 450 Myr ago extends eastwards the evidence of riftogenic processes in the Lower Paleozoic of Europe.