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Isotopic structure and evolution of the continental crust in the East Transbaikalian segment of the Central Asian Foldbelt

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Abstract

New data on the geology and tectonics of the main structural elements of the East Transbaikalian segment of the Central Asian Foldbelt are discussed. Correlation charts of the main stratified and igneous complexes are compiled. The rocks of the Baikal-Patom and Baikal-Muya belts, as well as the Barguzin-Vitim Superterrane, are characterized by new Nd isotopic data, which have allowed us to establish the sources of these rocks, to separate isotopic provinces, and to distinguish two stages of crust-forming processes: the Early Baikalian (1.0–0.8 Ga) and the Late Baikalian (0.70–0.62 Ga). The Early Baikalian crust was formed in relatively narrow and spatially isolated troughs of the Baikal-Muya Belt and probably in the Amalat Terrane, whereas the Late Baikalian continental crust was formed and reworked in the Karalon-Mamakan, Yana, and Katera-Uakit zones of the Baikal-Muya Belt. The Baikal-Patom Belt and most of the Anamakit-Muya Zone in the Baikal-Muya Belt are characterized by remobilization of the Early Precambrian continental crust and by a subordinate role of Late Riphean juvenile sources. Reworking of the mixed Late Riphean and Early Precambrian crustal sources is typical of the Barguzin-Vitim Superterrane. The origination and evolution of the continental crust in the studied region are considered in light of new data; alternative versions of paleogedynamic reconstructions are discussed.

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Authors and Affiliations

  1. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, nab. Makarova 2, St. Petersburg, 199034, Russia

    E. Yu. Rytsk, E. S. Bogomolov & A. B. Kotov

  2. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, Staromonetnyi per. 35, Moscow, 119017, Russia

    V. P. Kovach & V. V. Yarmolyuk

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  1. E. Yu. Rytsk
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  2. V. P. Kovach
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  3. V. V. Yarmolyuk
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Original Russian Text © E.Yu. Rytsk, V.P. Kovach, V.V. Yarmolyuk, V.I. Kovalenko, E.S. Bogomolov, A.B. Kotov, 2011, published in Geotektonika, 2011, Vol. 45, No. 5, pp. 17–51.

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Rytsk, E.Y., Kovach, V.P., Yarmolyuk, V.V. et al. Isotopic structure and evolution of the continental crust in the East Transbaikalian segment of the Central Asian Foldbelt. Geotecton. 45, 349–377 (2011). https://doi.org/10.1134/S0016852111050037

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