AbstractGranitoid plutons are often difficult to radiometrically date precisely due the possible effects of protracted and complex magmatic evolution, crustal inheritance, and/or partial re-setting radiogenic clocks. However, apart from natural/geological issues, methodological analytical problems may also contribute blurring geochronological data. This be exemplified by Variscan Karkonosze Pluton (SW Poland). High-precision chemical abrasion (CA) ID-TIMS zircon data indicate that two main...

Abstract In the supercontinent of Rodinia, Baltica occurred next to Amazonia, then two drifted away when Rodinia broke up. By end Neoproterozoic, became an independent continent. At that time, Timanide orogen developed at its modern northeastern margin. most paleogeographical reconstructions, opposite (SW, Tornquist) edge faced Tornquist Ocean and remained just a passive margin till arrival Gondwana-born East Avalonia in late Ordovician. However, preliminary isotopic studies detrital zircons...

The granitoid intrusions of the Central Sudetes (CS) and Middle Odra Fault Zone (MOFZ), NE part Bohemian Massif, are both spatially temporally related to large-scale shear zones faults (including possible terrane boundaries) that provided effective channels for melt migration. Summarizing common features CS MOFZ granitoids, we have delineated a set characteristics fault-related zone-related granitoids: (1) they mainly generated by partial melting crustal sources, with variable contribution...

The Karkonosze–Izera Massif is a large tectonic unit located in the northern periphery of Bohemian Massif. It includes Variscan Karkonosze Granite (about 328–304 Ma) surrounded by following four older units: Izera–Kowary (the Early Paleozoic continental crust Saxothuringian Basin), Ještĕd Middle Devonian to Lower Viséan sedimentary succession deposited on NE passive margin Terrane), out present study area, Southern (metamorphosed sediments and volcanics filling Leszczyniec (Early Ordovician,...

Pet ro log i cal data and re cently pub lished U/Pb zir con SHRIMP ages veal a pro tracted Variscan mag matic evo lu tion in the Strzelin Mas sif (SW Po land), with three main stages of granitoid plutonism: 1 -tonalitic I, 2 -granodioritic 3 II/gra nitic.The granitoids sec ond third form tru sion that is com posed va ri et ies: medium-grained bi o tite gran ite, fine-grained ite tite-mus co vite ite.New show me dium-grained ites prise dif fer ent pop u la tions flect plex prolonged plutonic...

The Strzelin Massif in SW Poland (Central European Variscides) records a protracted igneous evolution, with three main magmatic stages: (1) tonalitic I, (2) granodioritic and (3) II/granitic. In the northern part of this Massif, intrusion proper comprises successively emplaced rock types: medium-grained biotite granite (303 ± 2 Ma), fine-grained (283 8 Ma) biotite-muscovite granite; based on field evidence, third variety postdates both types granites. structural data from granites, including...

Three Carboniferous-age detrital muscovites from the Variscan foreland basin of SW Poland and two phyllites underlying basement have been dated by 40 Ar/ 39 Ar step-heating single-crystal laser fusion method. analysis micas defines preferred ages 370.7 ± 1.4, 363.0 1.9 355.0 1.3 Ma. Single-crystal data indicate little dispersion for first three samples, with an integrated age that closely matches data, but latter describe inhomogeneous populations. The white mica concentrate one phyllite...

Late stage Variscan magmatism

The Lusatian Massif in the Central European Variscides, composed of Upper Neoproterozoic (c.570 Ma) greywacke intruded by c. 540 Ma old Cambrian granodiorites (and somewhat younger Zawidów granodiorites), constitutes a fragment Cadomian basement Saxo-Thuringian Zone.The adheres on east to Karkonosze-Izera 500 Izera/Rumburk granites related Cambro-Ordovician rifting basement, and narrow belts micaschists.Trace-element Sm-Nd isotope data suggest that source rocks for greywacke, granodiorite...