The Saxothuringian Terrane affinity of the metamorphic Stachow Complex (Strzelin Massif, Fore-Sudetic Block, Poland) inferred from zircon ages

The Saxothuringian Terrane deined in the west ern part of the Bohemian Massif is regarded to have easterly continuations in the Karkonosze-Izera Massif, the Kamieniec Zabkowicki Belt and the Orlica-Snienik Dome. All these units comprise Early Ordovician (similar to 500 Ma) metagranites associated with mica schists. Even more to the east, similar to 500 Ma metagranites and metasedimentary rocks occur also in the Strzelin Massif of the East Sudetes, where they are known as the pale and dark Stachow gneisses, respectively. Al together, these rocks form the StachowCom plex which was thrust on the Strzelin Complex of the Brunovistulicum Terrane during the Variscan Orogeny. The contribution presents lines of evidence for a Saxothuringian affinity of the Stachow Complex rocks: (1) the new SHRIMP U-Pb age data of zircons from both the pale and dark Stachow gneisses; (2) the indication that the zircon age spectra from the similar to 500 Ma granitoids and their accompanying metasedimentary rocks are similar to those found in other parts of the Sudetes; (3) the Armorican age pat tern of inherited zircons of the pale Stachow gneisses, as also ob served in the Saxothuringian Terrane; (4) the similarity of trace elementsandSm-Nd iso tope data of the Stachow gneisses and cor relative rocks from the Karkonosze-Izera Massif and theOrlica-OEnienik Dome.