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A Reconstruction of a Vendian–Cambrian Active Continental Margin within the Southern Urals: Results of Detrital Zircons Studying from Ordovician Terrigenous Rocks

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Abstract—

Detrital zircons of Ordovician terrigenous sequences are studied in various Southern Uralian tectonic units. The age of detrital zircons of the West Uralian and Transuralian megazones, Taganai–Beloretsk Zone, and Kraka allochthons spans from the Late Archean to the end of the Vendian– beginning of the Cambrian; Early Precambrian and Early–Middle Riphean zircons are the most abundant. Vendian–Cambrian detrital zircons are strongly dominant in the Uraltau Zone, Sakmara allochthons, and East Uralian Megazone; the zircons of other ages are absent or extremely rare. The Vendian–Cambrian detrital zircons of all Southern Urals zones probably derive from volcanic and granitic rocks of the marginal continental belt, which are part of the Uraltau Zone, Sakmara allochthons, and East Uralian Megazone. The Lu–Hf isotopic characteristics of Vendian–Cambrian detrital zircons indicate that their parental rocks formed on a heterogeneous basement that includes blocks of juvenile and ancient continental crust. According to a model of the pre-Ordovician tectonic evolution of the Southern Urals, at the end of the Late Riphean, the passive margin of the East European Platform collided with a block on a heterogeneous basement. The formation of the block terminated with the Grenville Orogeny. After collision, a volcano-plutonic belt originated in the Vendian–Cambrian at the actively evolved margin of the East European Platform.

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Funding

Synthesis and analysis of geological materials of the Southern Urals was carried out in accordance with the plans of basic research of the Geological Institute of Russian Academy of Sciences (GIN RAS, Moscow, Russia) (no. 0135-2016-0009). The study of heterogeneity of the crust of the Southern Urals, field works, isotopic analytical studies, and preparation of the paper were supported by the Russian Science Foundation (project no. 14-27-00058). Sample preparation and processing of analytical data were supported by the Russian Foundation for Basic Research (project nos. 16-05-00259 and 16-05-00519). This paper is contribution 1366 from the ARC Centre of Excellence for Core to Crust Fluid Systems (Sydney, Australia; http://www.ccfs. mq.edu.au) and 1322 in the GEMOC Key Centre (Sydney, Australia; http://www.gemoc.mq.edu.au).

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Authors and Affiliations

  1. Geological Institute, Russian Academy of Sciences, 119017, Moscow, Russia

    A. V. Ryazantsev, N. B. Kuznetsov & K. E. Degtyarev

  2. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, 123242, Moscow, Russia

    T. V. Romanyuk

  3. Russian State University of Oil and Gas, 11991, Moscow, Russia

    N. B. Kuznetsov & T. V. Romanyuk

  4. Karpinsky Russian Research Geological Institute (VSEGEI), 199106, St. Petersburg, Russia

    T. Yu. Tolmacheva

  5. Australian Research Council Centre of Excellence for Core to Crust Fluid Systems (CCFS/GEMOC), Macquarie University, 2109, Sydney, Australia

    E. A. Belousova

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Correspondence to A. V. Ryazantsev.

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Reviewers: V.N. Puchkov, T.N. Kheraskova

Translated by I. Melekestseva

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Ryazantsev, A.V., Kuznetsov, N.B., Degtyarev, K.E. et al. A Reconstruction of a Vendian–Cambrian Active Continental Margin within the Southern Urals: Results of Detrital Zircons Studying from Ordovician Terrigenous Rocks. Geotecton. 53, 485–499 (2019). https://doi.org/10.1134/S0016852119040058

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