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Ordovician passive continental margin magmatism in the Central-European Variscides: U–Pb zircon data from the SE part of the Karkonosze-Izera Massif, Sudetes, SW Poland

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Abstract

Approximately 500-Ma-old orthogneisses are widespread in the eastern part of the Variscan belt and are commonly interpreted to have intruded mica-schist series of assumed Neoproterozoic age. New SHRIMP zircon ages of quartzofeldspathic metavolcanogenic rocks of the mica schist series in the eastern part of the Karkonosze-Izera Massif (SW Poland) indicate that they are late Cambrian/early Ordovician rather than Neoproterozoic in age, based on the zircon age spectra distributed mainly between ca. 500 and 660 Ma (with a few Proterozoic inherited minimum ages of ca. 970 and 1,825 Ma). Younger zircon dates, dispersed between ca. 412 and 464 Ma, are interpreted as a result of Pb-loss likely caused by subsequent metamorphism. Consequently, the felsic metavolcanogenic rocks appear to be roughly contemporaneous with the intrusion of ca. 500-Ma-old orthogneiss protoliths (with the pooled concordia age of 487 ± 8 Ma interpreted as the best approximation of the protolith intrusive age). Field relationships, petrological and geochemical features of the felsic and mafic rocks studied support a model in which the accompanying mica schist series are not the original country rocks to the ca. 500 Ma granite intrusions, and indicate that their recent close proximity is the result of tectonic juxtaposition. However, both the mica schists enclosing the bimodal metavolcanic rocks, and the orthogneisses, are interpreted to represent a Cambro-Ordovician passive continental margin sequence being part of the Saxothuringian domain. They are tectonically overlain to the east by HP/T metamorphic units, comprising MORB-type metaigneous rocks, and delineating a tectonic suture separating the Saxothuringian block in the west from an assumed continental block (Tepla-Barrandian) to the south-east.

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Acknowledgments

This research was carried out under the Project MNiI 5T12B 036 25 of the Polish National Research Committee (KBN). Additional support came from internal grants 1017/S/ING and 2022/W/ING of the University of Wrocław. One of the authors (R. Kryza) is involved in the IGCP 497 Project: “The Rheic Ocean: Its origin, evolution and correlatives” which deals with the geological background for the issues presented in this paper. Fruitful discussions with C. Pin are gratefully acknowledged. Pavla Štipska, Ulf Linnemann, Friedrich Finger and an anonymous reviewer are thanked for their constructive reviews.

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Authors and Affiliations

  1. Institute of Geological Sciences, University of Wrocław, Plac M. Borna 9, 50-204, Wrocław, Poland

    Teresa Oberc-Dziedzic & Ryszard Kryza

  2. Faculty of Geology, Geophysics and Environmental Protection, Department of Economic Geology, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059, Kraków, Poland

    Ksenia Mochnacka

  3. Centre of Isotopic Research, A.P. Karpinsky All-Russian Geological Research Institute (VSEGEI), 74 Sredny Pr, St Petersburg, 199 106, Russia

    Alexander Larionov

Authors
  1. Teresa Oberc-Dziedzic
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  2. Ryszard Kryza
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  3. Ksenia Mochnacka
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  4. Alexander Larionov
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Corresponding author

Correspondence to Ryszard Kryza.

Appendix: SHRIMP analytical procedure

Appendix: SHRIMP analytical procedure

In situ U–Pb analyses were performed on a SHRIMP-II at the Centre of Isotopic Research (CIR) at VSEGEI, applying a secondary electron multiplier in peak-jumping mode following the procedure described in Williams (1998) and Larionov et al. (2004). A primary beam of molecular oxygen was employed to ablate zircon in order to sputter secondary ions. The elliptical analytical spots had a size of ca. 27 × 20 μm, and the corresponding ion current was ca. 4 nA. The sputtered secondary ions were extracted at 10 kV. The 80 μm wide slit of the secondary ion source, in combination with a 100-μm multiplier slit, allowed mass-resolution of M/ΔM ≥ 5,000 (1% valley) so that all the possible isobaric interferences were resolved. One-minute rastering over a rectangular area of ca. 60 × 50 μm was employed before each analysis in order to remove the gold coating and possible surface common Pb contamination.

The following ion species were measured in sequence: 196(Zr2O)–204Pb–background (ca. 204 AMU) –206Pb–207Pb– 208Pb–238U–248ThO–254UO with integration time ranging from 2 to 20 s. Four cycles for each spot analysed were acquired. Each fifth measurement was carried out on the zircon Pb/U standard TEMORA (Black et al. 2003) with an accepted 206Pb/238U age of 416.75 ± 0.24 Ma. The 91500 zircon with a U concentration of 81.2 ppm and a 206Pb/238U age of 1062.4 ± 0.4 Ma (Wiedenbeck et al. 1995) was applied as a “U-concentration” standard. The collected results were then processed with the SQUID v1.12 (Ludwig 2005a) and ISOPLOT/Ex 3.22 (Ludwig 2005b) software, using the decay constants of Steiger and Jäger (1977). The common lead correction was done using measured 204Pb according to the model of Stacey and Kramers (1975).

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Oberc-Dziedzic, T., Kryza, R., Mochnacka, K. et al. Ordovician passive continental margin magmatism in the Central-European Variscides: U–Pb zircon data from the SE part of the Karkonosze-Izera Massif, Sudetes, SW Poland. Int J Earth Sci (Geol Rundsch) 99, 27–46 (2010). https://doi.org/10.1007/s00531-008-0382-4

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