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Stratigraphy and Geological Correlation

, Volume 26, Issue 2, pp 157–178 | Cite as

Geochemical Features and Sources of Metasedimentary Rocks of the Western Part of the Tukuringra Terrane of the Mongol–Okhotsk Fold Belt

  • V. A. Zaika
  • A. A. Sorokin
  • B. Xu
  • A. B. Kotov
  • V. P. Kovach
Article
  • 21 Downloads

Abstract

This work presents the results of geological, geochemical, Sm–Nd isotope-geochemical studies of metasedimentary rocks of the Teploklyuchevskaya, Garmakan, and Algaja formations of the Tukuringra Terrane of the eastern part of the Mongol–Okhotsk fold belt, as well as U–Th–Pb geochronological (LA-ICP-MS) studies of detrital zircons from these rocks. It is established that the lower age boundary of formation of the protolith of metasedimentary rocks of the Teploklyuchevskaya Formation is about 243 Ma (Middle Triassic); those of the Garmakan and Algaja formations are ~175 Ma (Lower–Middle Jurassic boundary) and ~192 Ma (Lower Jurassic), respectively. This makes it possible to correlate the Teploklyuchevskaya, Garmakan, and Algaja formations with the youngest sedimentary complexes of the eastern part of the Mongol–Okhotsk fold belt. In terms of geochemistry, the protoliths of metasedimentary rocks of the above-mentioned formations are the most similar to sedimentary rocks of island arcs and active continental margins. The source terrigenous material was transported from the southern frame of the Mongol–Okhotsk fold belt. It is not improbable that Lower Mesozoic deposits of the western part of the Tukuringra Terrane, in particular, and the eastern part of the Mongol–Okhotsk fold belt, as a whole, are relics of residual basins, preserved in “gaps” in the collision zone between the southern margin of plates of the North Asian Craton and the Amur Superterrane.

Keywords

metasedimentary rocks age detrital zircons Mesozoic Mongol–Okhotsk fold belt accretionary complex residual basin 

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • V. A. Zaika
    • 1
  • A. A. Sorokin
    • 1
  • B. Xu
    • 2
  • A. B. Kotov
    • 3
  • V. P. Kovach
    • 3
  1. 1.Institute of Geology and Nature Management, Far Eastern BranchRussian Academy of SciencesBlagoveshchenskRussia
  2. 2.Peking UniversityBeijingChina
  3. 3.Institute of Precambrian Geology and GeochronologyRussian Academy of SciencesSt. PetersburgRussia

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