Detrital zircon analysis of metasedimentary rocks of the Staré Město Belt, Sudetes: implications for the provenance and evolution of the eastern margin of the Saxothuringian terrane, NE Bohemian Massif

The Staré Město Belt (SMB) in the Central Sudetes forms a Variscan tectonic boundary zone that is located between Saxothuringian and Brunovistulian terranes of Bohemian Massif. three thrust-bounded upper, middle lower lithotectonic units SMB are composed metasedimentary Late Cambrian metavolcanic rocks. A new LA-ICPMS zircon geochronology supported by typology studies mica schists upper unit migmatitic paragneisses provides insights into provenance evolution SMB. Our data were obtained from rocks compared to previously published ages results indicate bimodal separate originally formed volcano-sedimentary successions. source areas sedimentary basins studied dominated Neoproterozoic Paleoproterozoic crystalline presumably near West African Craton Gondwana. comparison detrital age spectra with those region indicates strong association entire terrane During partial melting SMB, older grains affected solid-state transformations caused resetting U-Pb dates, changes internal textures reductions Th/U ratios.