The eastern part of the Saxothuringian Terrane characterized by zircon and monazite data from the Doboszowice Metamorphic Complex in the Sudetes (SW Poland)

• Autorzy: Jastrzębski Mirosław , Żelaźniewicz Andrzej , Stawikowski Wojciech , Budzyń Bartosz , Krzemińska Ewa , Machowiak Katarzyna , Madej Stanisław , Białek Dawid , Sláma Jiří , Czupyt Zbigniew , Jaźwa Aleksandra

Identyfikatory

DOI

0.14241/asgp.2023.11

• Języki publikacji: EN

Abstrakty

EN

In the Variscan Bohemian Massif, orthogneiss complexes of different sizes, derived from early Palaeozoic granitoids, are accompanied by metavolcano-sedimentary successions. They are common in the Sudetes, SW Poland, and belong mainly to the Saxothuringian Terrane. In order to better characterize the evolution of the latter, new U-Pb and O isotopic zircon analyses, combined with zircon typology and new U-Th-Pb isotopic monazite analyses, were performed. The present data show that the S-type granitic precursors of the Doboszowice orthogneisses (Fore-Sudetic Block) and the Śnieżnik gneisses (Sudetes) were formed at ca. 495 Ma from differently evolved magmas. Protoliths of the Doboszowice orthogneisses developed entirely in the crust, whereas the precursors to the Śnieżnik gneisses received some mantle input. Metasediments that accompany the Doboszowice orthogneisses reveal zircon spectra, which point to a late Cambrian-Early Ordovician sedimentary age. These spectra, in addition to predominant grains with Ediacaran ages, contain up to 10% of zircons dated at ca. 1.0 Ga. Therefore, it is suggested that the parent basin was supplied with detritus coming from areas, located in the Libyan-Nubian part of North Africa. Using also earlier published data, such a provenance is assigned to the units that now occur in the eastern part of the Fore-Sudetic Block. Late Cambrian-Early Ordovician granite intrusions and the concurrent accumulation of sediments originated in an extensional setting of the peri-Gondwana rifted continental margin or a back-arc setting. The Pb/U and Pb/Th monazite data constrain the ca. 346–341-Ma peak of the Variscan regional metamorphism in the eastern Saxothuringian Terrane and the prolonged juxtaposition of now adjacent tectonic units at least until 330 Ma.

Słowa kluczowe

EN

Bohemian Massif; Doboszowice Metamorphic Complex; Saxothuringian Terrane; isotope geochronology; Cambro-Ordovician magmatism; Variscan collision

• Wydawca: Polskie Towarzystwo Geologiczne
• Czasopismo: Annales Societatis Geologorum Poloniae
• Rocznik: 2023
• Tom: Vol. 93, No. 3
• Strony: 229--249
• Opis fizyczny: Bibliogr. 103 poz., map., fot.,rys., tab., wykr.

Twórcy

autor

Jastrzębski Mirosław

• Institute of Geological Sciences, Polish Academy of Sciences, Podwale 75, 50-449 Wrocław, Poland

• https://orcid.org/0000-0002-7571-6244

autor

Żelaźniewicz Andrzej

• Institute of Geological Sciences, Polish Academy of Sciences, Podwale 75, 50-449 Wrocław, Poland

autor

Stawikowski Wojciech

• Adam Mickiewicz University, Faculty of Geographical and Geological Sciences, Institute of Geology, B. Krygowskiego 12, 61-680 Poznań, Poland

• https://orcid.org/0000-0001-6221-6542

autor

Budzyń Bartosz

• Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Kraków, Senacka 1, 31-002 Kraków, Poland

• https://orcid.org/0000-0002-1186-0888

autor

Krzemińska Ewa

• Polish Geological Institute - National Research Institute, Rakowiecka 4, 00-975 Warszawa, Poland

• https://orcid.org/0000-0002-6832-8104

autor

Machowiak Katarzyna

• Poznań University of Technology, Institute of Civil Engineering, Piotrowo 5, 60-965 Poznań, Poland

• https://orcid.org/0000-0002-6130-3385

autor

Madej Stanisław

• University of Wrocław, Institute of Geological Sciences, Maksa Borna 9, 50-204 Wrocław, Poland

autor

Białek Dawid

• University of Wrocław, Institute of Geological Sciences, Maksa Borna 9, 50-204 Wrocław, Poland

• https://orcid.org/0000-0002-8425-1805

autor

Sláma Jiří

• The Czech Academy of Sciences, Institute of Geology, Rozvojová 269, Prague 6, 16500, Czech Republic

• https://orcid.org/0000-0002-1386-4196

autor

Czupyt Zbigniew

• Polish Geological Institute - National Research Institute, Rakowiecka 4, 00-975 Warszawa, Poland

• https://orcid.org/0000-0002-3416-9475

autor

Jaźwa Aleksandra

• Institute of Geological Sciences, Polish Academy of Sciences, Podwale 75, 50-449 Wrocław, Poland

• https://orcid.org/0000-0001-7990-8844

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