Abstract
The Beloretsk Metamorphic Complex in the SW Urals formed at a convergent eastern margin of Baltica during the Neoproterozoic-Early Cambrian Timanide orogeny. It comprises three major units with lenses of facies-critical metabasites within metasedimentary rocks: A lowermost eclogite unit, an intermediate garnet amphibolite unit and an upper amphibolite-greenschist unit. Pressure (P)-temperature (T)-paths of four rocks from the two lowermost units were determined mainly by PT pseudosection techniques showing similar clockwise loops at different peak metamorphic, water-saturated conditions: A phengite-bearing eclogite shows peak PT conditions of 16.5–18.5 kbar/525–550 °C (stage I) followed by stage II at 11.5–13.0 kbar/585–615 °C. A garnet amphibolite from the intermediate unit yields lower peak conditions of 11.7–14.5 kbar/480–510 °C (stage I) followed by stage II at 9.5–11.0 kbar/535–560 °C. However, a granite gneiss in the eclogite unit shows similar maximum pressures as the eclogite, but higher temperatures at 15.6–16.2 kbar/660–675 °C, whereas a garnet micaschist contains comparable high pressure relicts, but underwent an advanced midcrustal reequilibration at 7.5–9.0 kbar/555–610 °C. We dated the eclogite by a 7-point Rb/Sr mineral isochron (phengite, omphacite, apatite) at 532.2±9.1 Ma interpreted as age of crystallisation of the eclogitic peak PT assemblage. This age is the youngest compared to the known Timanide metamorphic and magmatic ages.
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Acknowledgments
This publication is dedicated to the memory of Aleksej A. Alekseev who guided the first author to the Beloretsk Complex in 1999 and shared his knowledge with him. He sadly passed away in 2008. Samples were collected during a field leg in 1999 that was financed by Deutsche Forschungsgemeinschaft (No. Wi 875-6/1, 2) to Arne P. Willner, which is gratefully acknowledged. We thank R. Klemd and S. Sindern for their helpful suggestions. The final publication is available at Springer via https://doi.org/10.1007/s12583-019-1249-2.
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Willner, A.P., Gopon, M., Glodny, J. et al. Timanide (Ediacaran-Early Cambrian) Metamorphism at the Transition from Eclogite to Amphibolite Facies in the Beloretsk Complex, SW-Urals, Russia. J. Earth Sci. 30, 1144–1165 (2019). https://doi.org/10.1007/s12583-019-1249-2
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DOI: https://doi.org/10.1007/s12583-019-1249-2