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Pre-collisional crustal evolution of the European Variscan periphery: Constraints from detrital zircon U–Pb ages and Hf isotopic record in the Precambrian metasedimentary basement of the Brunovistulian Domain
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SYSNO ASEP 0554969 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Pre-collisional crustal evolution of the European Variscan periphery: Constraints from detrital zircon U–Pb ages and Hf isotopic record in the Precambrian metasedimentary basement of the Brunovistulian Domain Author(s) Soejono, I. (CZ)
Schulmann, K. (CZ)
Sláma, Jiří (GLU-S) SAI, RID, ORCID
Hrdličková, K. (CZ)
Hanžl, P. (CZ)
Konopásek, J. (CZ)
Collett, S. (CZ)
Míková, J. (CZ)Article number 106606 Source Title Precambrian Research. - : Elsevier - ISSN 0301-9268
Roč. 272, May (2022)Number of pages 20 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords Detrital zircon dating ; Hf isotopes ; Brunovistulian Domain ; Bohemian Massif ; Paleogeoraphy ; Pre-collisional evolution OECD category Geology Method of publishing Limited access Institutional support GLU-S - RVO:67985831 UT WOS 000793714700001 EID SCOPUS 85125118688 DOI 10.1016/j.precamres.2022.106606 Annotation In this study, U–Pb ages and Hf isotopic composition of detrital zircons from the Precambrian metasedimentary autochthon of the Brunovistulian Domain in the eastern Bohemian Massif were investigated to understand the pre-collisional evolution of the eastern periphery of the European Variscan belt. Detrital zircons of the Tonian sequences have mostly Paleoproterozoic to Neoproterozoic ages (c. 2.1–0.9 Ga) and are interpreted as detritus derived from the basement of either Baltica or Amazonia. The mostly positive εHf(t) values (–4 to + 16) indicate a juvenile nature of their magma sources with minor older crustal components. In contrast, the Ediacaran sequences contain dominantly Neoproterozoic zircons (c. 600 Ma) and only rare Paleo- and Mesoproterozoic ages indicate that they were sourced from the adjacent Neoproterozoic magmatic arc with very limited input of recycled cratonic detritus. The large spread of εHf(t) values (–15 to + 13) of the Neoproterozoic zircons suggests significant mixing of mantle-derived magmas with mature crustal material, typical of large continental magmatic arc systems. The zircon age patterns of the Ediacaran sequences, characterized by a dominance of the late Neoproterozoic zircons and limited Mesoproterozoic zircons, are nearly identical to those from the Tepl´a–Barrandian Unit and Moldanubian Zone, pointing to their similar sources. We consider such age populations as a record of sources actually exposed at the time of deposition, rather than the real provenance signature of the continental basement. The change in detrital zircon U–Pb age and Hf record of the Brunovistulian Domain took place between the early and late Neoproteorozoic, and probably reflects the plate-tectonic reconfiguration from the Rodinia formation/break-up to the evolution of the Gondwana or Baltica active margins. Our data challenge the main arguments for an existence of the Rheic oceanic suture between the Brunovistulian Domain and Moldanubian Zone and allow for an alternative pre-collisional model of the Bohemian Massif as a single Neoproterozoic crustal domain. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2023 Electronic address https://www.sciencedirect.com/science/article/pii/S030192682200050X
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