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The “Upper Basalts” of the East Chukotka Segment of Okhotsk–Chukotka Belt: the Along Strike Migration of Volcanic Activity or the Overprint by Later Magmatic Event?

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Abstract

New U–Pb and 40Ar/39Ar isotopic dates on volcanic rocks of the East Chukotka segment of the Okhotsk–Chukotka Belt correspond to 76–71 Ma span, which is partially beyond the conventional lifetime of this volcanic province. This could result from the migration of magmatic loci along the strike of the volcanic belt, and/or from the overprint by a younger magmatic event.

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Funding

This study was supported by the Russian Science Foundation (project no. 19-47-04110) and DFG (LH55/5-1). P.L. Tikhomirov’s work related to interpretation of the results was carried out under a State Assignment of the Shilo North-East Interdisciplinary Scientific Research Institute, Far East Branch, Russian Academy of Sciences (project no. 121031700312-1).

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Authors and Affiliations

  1. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, 119991, Moscow, Russia

    P. L. Tikhomirov, I. E. Lebedev, A. M. Pasenko & V. E. Pavlov

  2. Shilo North-East Interdisciplinary Scientific Research Institute, Far East Branch, Russian Academy of Sciences, 685000, Magadan, Russia

    P. L. Tikhomirov

  3. Ludwig Maximillian University, Munich, Germany

    F. J. L. Lhuillier

  4. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    D. V. Alekseev

Authors
  1. P. L. Tikhomirov
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  2. I. E. Lebedev
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  3. A. M. Pasenko
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  4. F. J. L. Lhuillier
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  5. D. V. Alekseev
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  6. V. E. Pavlov
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Corresponding author

Correspondence to P. L. Tikhomirov.

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The authors declare that they have no conflicts of interest.

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Translated by E. Maslennikova

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Tikhomirov, P.L., Lebedev, I.E., Pasenko, A.M. et al. The “Upper Basalts” of the East Chukotka Segment of Okhotsk–Chukotka Belt: the Along Strike Migration of Volcanic Activity or the Overprint by Later Magmatic Event?. Dokl. Earth Sc. 501, 1038–1042 (2021). https://doi.org/10.1134/S1028334X21120151

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  • DOI: https://doi.org/10.1134/S1028334X21120151

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