New U–Pb monazite and zircon data from the Sudetes Mountains in SW Poland: evidence for a single‐cycle Variscan orogeny

Abstract

New U–Pb monazite and zircon data combined with a study of their internal morphologies significantly clarifies the controversy surrounding the Palaeozoic geodynamic evolution of the Sudetes Mountains in the northeastern Bohemian Massif. Variably thin rims of secondary magmatic overgrowth on zircons from an anatectic granite in the Góry Sowie block are dated by a U–Pb zircon lower intercept age of 353±61 Ma, by magmatic monazite growth at 378±2 Ma, and by xenotime crystallization at 383–370 Ma in a late syntectonic pegmatite, reflecting the anatectic event associated with a single‐cycle Variscan orogeny in this area.