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Multiple Archaean to Early Palaeozoic events of the northern Gondwana margin witnessed by detrital zircons from the Radzimowice Slates, Kaczawa Complex (Central European Variscides)

RAFA TYSZKA^*, RYSZARD KRYZA^*,, JAN A. ZALASIEWICZ and ALEXANDER N. LARIONOV

^* University of Wrocaw, Institute of Geological Sciences, Department of Mineralogy and Petrology, ul. Cybulskiego 30, 50-205 Wrocaw, Poland
University of Leicester, Department of Geology, University Road, Leicester LE1 7RH, UK
Centre of Isotopic Research, A.P. Karpinsky All Russian Geological Research Institute (VSEGEI), 74 Sredny Pr, St Petersburg, 199 106, Russia

View larger version (31K): [in this window] [in a new window]   Figure 1. Geological sketch map of the Kaczawa Mountains (a) showing major lithological subdivisions, tectonic units and location of the study area and sampling sites (c). Inset map (b) shows the location of the area in the Bohemian Massif; EFZ – Elbe Fault Zone; ISF–Intra-Sudetic Fault; MGH – Mid-German Crystalline High; MO – Moldanubian Zone; MS – Moravo-Silesian Zone; NP – Northern Phyllite Zone; OFZ – Odra Fault Zone; RH – Rhenohercynian Zone; SX – Saxothuringian Zone. The Radzimowice Slates outcrop (c) based on Zimmermann (1932) and Baranowski (1988).

View larger version (43K): [in this window] [in a new window]   Figure 2. CL images of selected zircons of sample CHR22. Analytical points indicated by brighter ovals; their symbols correspond to those given in Table 1.

View larger version (11K): [in this window] [in a new window]   Figure 3. Terra-Wasserburg plot showing results of SHRIMP II zircon analyses from sample CHR22.

View larger version (62K): [in this window] [in a new window]   Figure 4. CL images of selected zircons of sample RDZ214. Analytical points indicated by brighter ovals: their symbols correspond to those given in Table 1.

View larger version (11K): [in this window] [in a new window]   Figure 5. Terra-Wasserburg plot showing results of SHRIMP II zircon analyses from sample RDZ214.

View larger version (19K): [in this window] [in a new window]   Figure 6. Probability density plot of 206Pb–238U ages of zircons from the Radzimowice Slates, samples CHR22 and RDZ214.

View larger version (33K): [in this window] [in a new window]   Figure 7. Alternative stratigraphic correlations of the Radzimowice Slates with the regional successions of the Kaczawa Complex. Generalized stratigraphic log adapted from Kryza & Muszyski (2003). Scenario A is considered to be the most likely correlation.

View larger version (20K): [in this window] [in a new window]   Figure 8. Cartoon showing our interpretation of the palaeogeographic and depositional setting of the Radzimowice Slates (a) and their recent tectonic position (b).