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Riftogenic magmatism of western part of the Early Mesozoic Mongolian–Transbaikalian igneous province: Results of geochronological studies

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Abstract

Geochronological studies of rocks from a bimodal high-alkali volcanic–plutonic complex collected in the area of Kharkhorin zone of the Early Mesozoic Mongolian–Transbaikalian igneous province (MTIP) are made. The age of alkali granites from Olziit sum is 211 ± 1 Ma (U–Pb ID-TIMS on zircon) to 209 ± 2 and 217 ± 4 Ma (40Ar/39Ar on alkali amphibole); the age of alkali granite-porphyries from the area of Sant sum is 206 ± 1 Ma (U–Pb ID-TIMS on zircon). These rock series formed syncronously to the analogous magmatism episode in the Northern Gobi and Western Transbaikalian rift zones of the MTIP. The similarity of the age and composition of igneous associations of the MTIP suggests a common mechanism of its formation related to the effect of a mantle plume on the continental lithosphere at the base of the entire igneous zone having a zonal structure.

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Authors and Affiliations

  1. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, Moscow, Russia

    V. V. Yarmolyuk, A. M. Kozlovsky & E. A. Kudryashova

  2. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, St. Petersburg, Russia

    E. B. Salnikova

  3. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia

    A. V. Travin

  4. Novosibirsk State University, Novosibirsk, Russia

    A. V. Travin

  5. Tomsk State University, Tomsk, Russia

    A. V. Travin

Authors
  1. V. V. Yarmolyuk
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  2. A. M. Kozlovsky
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  3. E. B. Salnikova
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  4. A. V. Travin
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  5. E. A. Kudryashova
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Corresponding author

Correspondence to A. M. Kozlovsky.

Additional information

Original Russian Text © V.V. Yarmolyuk, A.M. Kozlovsky, E.B. Salnikova, A.V. Travin, E.A. Kudryashova, 2017, published in Doklady Akademii Nauk, 2017, Vol. 475, No. 6, pp. 669–675.

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Yarmolyuk, V.V., Kozlovsky, A.M., Salnikova, E.B. et al. Riftogenic magmatism of western part of the Early Mesozoic Mongolian–Transbaikalian igneous province: Results of geochronological studies. Dokl. Earth Sc. 475, 872–876 (2017). https://doi.org/10.1134/S1028334X17080293

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  • DOI: https://doi.org/10.1134/S1028334X17080293

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