Journal
GEOLOGICAL MAGAZINE
Volume 160, Issue 8, Pages 1498-1534Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0016756823000523
Keywords
Detrital zircon; Laser ablation ICP-MS; provenance; Gondwana-derived terranes; Fore-Sudetic Block; Bohemian Massif; Variscan metamorphism
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The Kamieniec Metamorphic Belt and the Doboszowice Metamorphic Complex provide valuable insights into the evolution of the early Palaeozoic Gondwana margin. Through the analysis of zircon ages and rock compositions, it is evident that the rocks in these areas originated from the Cadomian orogen and were deposited in basins formed on the Gondwana margin. The results suggest a connection between the eastern part of the Fore-Sudetic Block and the Trans-Saharan Belt or West African Craton, indicating that it was part of the Gondwana shelf. The closure of the Rheic Ocean is not responsible for the suture separating the Brunovistulian domain from the rest of the Gondwana-derived terranes.
The Kamieniec Metamorphic Belt (KMB) and the Doboszowice Metamorphic Complex (DMC) expose a fragment of the pre-Variscan volcano-sedimentary cover preserved in the Fore-Sudetic Block in the NE part of the Bohemian Massif. We present the age of detrital and magmatic zircon grains and the bulk rock chemical composition of rock samples from the KMB and the DMC to better understand the evolution of the early Palaeozoic Gondwana margin. The zircon age spectra were acquired by U-Pb LA-ICP-MS dating and represent two groups that differ by maximum depositional age (MDA). The paragneiss from the DMC displays the MDA at 456 Ma, whereas the mica shist from the KMB displays the MDA at 529 Ma. Older age peaks in both groups of samples are represented by the Neoproterozoic and less frequent the Paleoproterozoic and Archean. The data presented indicate that the rock successions were sourced from the Cadomian orogen and deposited in the basins that developed on the Gondwana margin. Our results support the suggestion that the crystalline basement in the eastern part of the Fore-Sudetic Block has an affinity to the Trans-Saharan Belt or West African Craton and was part of a Gondwana shelf. The final stage of evolution of the studied successions was related to the Variscan thermal overprint. Based on presented data, we support the idea that the suture separating the Brunovistulian domain from the rest of the Gondwana-derived terranes is not related to the closure of the Rheic Ocean and represents a local feature.
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