Detrital zircon analysis of metasedimentary rocks of the Staré Město Belt, Sudetes : implications for the provenance and evolution of the eastern margin of the Saxothuringian terrane, NE Bohemian Massif

• Autorzy: Śliwiński Marek , Jastrzębski Mirosław , Sláma Jiří

Identyfikatory

DOI

10.7306/gq.1653

• Języki publikacji: EN

Abstrakty

EN

The Staré Město Belt (SMB) in the Central Sudetes forms a Variscan tectonic boundary zone that is located between the Saxothuringian and Brunovistulian terranes of the Bohemian Massif. The three thrust-bounded upper, middle and lower lithotectonic units of the SMB are composed of metasedimentary and Late Cambrian metavolcanic rocks. A new LA-ICP-MS zircon geochronology supported by zircon typology studies of the mica schists of the upper unit and the migmatitic paragneisses of the middle unit provides new insights into the provenance and evolution of the SMB. Our new data were obtained from metasedimentary rocks and compared to the previously published zircon ages of the SMB metavolcanic rocks. The results indicate that the metasedimentary and bimodal metavolcanic rocks in the separate lithotectonic units of the SMB originally formed Late Cambrian volcano-sedimentary successions. The source areas of the sedimentary basins studied were dominated by Neoproterozoic and Paleoproterozoic crystalline rocks that were presumably located near the West African Craton of Gondwana. A comparison of the detrital age spectra obtained with those previously published from the region indicates a strong association of the entire SMB with the Saxothuringian terrane of the Bohemian Massif. During partial melting of the metasedimentary rocks of the middle unit of the SMB, Cambrian and older zircon grains were affected by solid-state transformations that caused partial resetting of the U-Pb dates, changes in internal zircon textures and reductions in Th/U ratios.

Słowa kluczowe

EN

detrital zircon age spectra; provenance; Variscan terranes; Staré Mìsto Belt; Bohemian Massif

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2022
• Tom: Vol. 66, No. 2
• Strony: art. no. 21
• Opis fizyczny: Bibliogr. 52 poz., fot., wykr.

Twórcy

autor

Śliwiński Marek

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

autor

Jastrzębski Mirosław

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

autor

Sláma Jiří

• Czech Academy of Sciences, Institute of Geology, Rozvojová 269, 165 00, Praha 6 – Lysolaje, Czech Republic

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).