Abstract
The eastern margin of the East European Craton (EEC) has a long lasting geological record of Precambrian age. Archaean and Proterozoic strata are exposed in the western fold-and-thrust belt of the Uralides and are known from drill cores and geophysical data below the Palaeozoic cover in the Uralides and its western foredeep. In the southern Uralides, sedimentary, metamorphic and magmatic rocks of Riphean and Vendian age occur in the Bashkirian Mega-anticlinorium (BMA) and the Beloretzk Terrane. In the eastern part of the BMA (Yamantau anticlinorium) and the Beloretzk Terrane, K-Ar ages of the <2-µm-size fraction of phyllites (potassic white mica) and slates (illite) give evidence for a complex pre-Uralian metamorphic and deformational history of the Precambrian basement at the southeastern margin of the EEC. Interpretation of the K-Ar ages considered the variation of secondary foliation and the diagenetic to metamorphic grade. In the Yamantau anticlinorium, the greenschist-facies metamorphism of the Mesoproterozoic siliciclastic rocks is of Early Neoproterozoic origin (about 970 Ma) and the S1 cleavage formation of Late Neoproterozoic (about 550 Ma). The second wide-spaced cleavage is of Uralian origin. In the central and western part of the BMA, the diagenetic to incipient metamorphic grade developed in Late Neoproterozoic time. In post-Uralian time, Proterozoic siliciclastic rocks with a cleavage of Uralian age have not been exhumed to the surface of the BMA. Late Neoproterozoic thrusts and faults within the eastern margin of the EEC are reactivated during the Uralian deformation.
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Acknowledgments
Fieldwork in the Ural and laboratory studies were funded by the Deutsche Forschungsgemeinschaft (DFG) grants Gl 182/3-1, /3-2, /3-3, /3-4, which are gratefully acknowledged. This paper is a contribution to EUROPROBE (URALIDES). EUROPROBE is co-ordinated within the International Lithosphere Program and is sponsored by the European Science Foundation. As a representative of the Russian team during the fieldwork, we thank Dr. V. N. Baryshev for his scientific and logistical help. Special thanks are given to Prof. R. Walter, Drs. U. Giese, L. Stroink and I. Matenaar for their help and support during fieldwork and many fruitful discussions. Furthermore, the authors like to thank Prof. Eynatten, Prof. Massonne, Drs. Merriman and Árkai, and an unknown reviewer for their helpful suggestions on earlier versions of the manuscript. We acknowledge the technical assistance of R. Wendling and T. Peyrone (Centre de Géochimie de la Surface, CNRS/ULP). This is EOST contribution no. AAA.NNN-UMR7517x.
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Glasmacher, U.A., Bauer, W., Clauer, N. et al. Neoproterozoic metamorphism and deformation at the southeastern margin of the East European Craton, Uralides, Russia. Int J Earth Sci (Geol Rundsch) 93, 921–944 (2004). https://doi.org/10.1007/s00531-004-0426-3
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DOI: https://doi.org/10.1007/s00531-004-0426-3