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First findings of Paleo- and Mesoarchean zircons in the rocks from the Central Arctic province of oceanic rises as an evidence of the ancient continental crust

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Abstract

This report presents the results of local U–Pb zircon dating (SIMS SHRIMP II) for a sample of migmatite gneiss dredged on the western slope of Alpha Ridge in the Arctic Ocean in the course of the “Arktika-2012” Russian polar expedition. The distribution of U–Pb ages of the examined zircon points to the Early Precambrian origin of this gneiss, for the bulk of the zircon was crystallized at least 3450 Ma ago from a magmatic melt under acidic volcanism at the primary crust formation. Zircon of the second generation was crystallized 3300 Ma ago under the remelting of acid volcanics and appearance of migmatite gneisses under the amphibolite facies of metamorphism. Most likely, a partial recrystallization of zircon and formation of microfolded structures and foliation took place 3000 Ma ago at the stage of rocks deformation. The latest zircon was formed 1900 Ma ago from the crust fluid or melt under the low-gradient metamorphism. In view of the possibility of the appearance of the treated clastogenic gneiss fragment under current oceanic erosion, the obtained results allow one to affirm that the occurrence of a fragment of the most ancient sialic continental crust formed at least 3450 Ma ago is possible at the submarine rises of the Arctic Ocean (Alpha Ridge and the Mendeleev Rise).

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Authors and Affiliations

  1. Karpinskii Russian Geological Research Institute, Russian Academy of Sciences, St. Petersburg, Russia

    S. A. Sergeev, S. L. Presnyakov, A. V. Antonov, B. V. Belyatsky, N. V. Rodionov & S. S. Shevchenko

  2. St. Petersburg State University, St. Petersburg, Russia

    S. A. Sergeev

Authors
  1. S. A. Sergeev
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  2. S. L. Presnyakov
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  3. A. V. Antonov
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  4. B. V. Belyatsky
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  5. N. V. Rodionov
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  6. S. S. Shevchenko
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Corresponding author

Correspondence to B. V. Belyatsky.

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Original Russian Text © S.A. Sergeev, S.L. Presnyakov, A.V. Antonov, B.V. Belyatsky, N.V. Rodionov, S.S. Shevchenko, 2015, published in Doklady Akademii Nauk, 2015, Vol. 463, No. 1, pp. 79–84.

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Sergeev, S.A., Presnyakov, S.L., Antonov, A.V. et al. First findings of Paleo- and Mesoarchean zircons in the rocks from the Central Arctic province of oceanic rises as an evidence of the ancient continental crust. Dokl. Earth Sc. 463, 684–689 (2015). https://doi.org/10.1134/S1028334X15070053

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  • DOI: https://doi.org/10.1134/S1028334X15070053

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