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The Mid-Paleozoic and Mid-Triassic Pulses of Trap Magmatism in the East of the Siberian Platform: Evidence from the First 40Ar/39Ar Isotope Dating of Dolerite Sills

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Abstract

The paper presents the results from the first 40Ar/39Ar isotope dating of eleven mafic sills recovered by deep boreholes in the eastern Siberian Platform. Most of the dates are assigned to the Devonian magmatic stage (357–379 Ma). The two previously established pulses of dike magmatism in the Yakutsk-Vilyui large igneous province also fall within this range. The ages of 397.6 ± 4.3 and 406.2 ± 5.6 Ma obtained in this study imply one more pulse of magmatism at the Emsian-Eifelian boundary. The chemical composition of the dolerites corresponds to that of the derivatives of garnet peridotite. Estimates of the depth of the melting center suggest its location both inside the mantle lithosphere and at the lithosphere-asthenosphere boundary. The Mid-Triassic age (232.6 ± 7.4 Ma) of the sill recovered by the Morkoka borehole implies the manifestation here of the second pulse of trap magmatism related to the Siberian plume.

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Authors and Affiliations

  1. Diamond and Precious Metal Geology Institute, Siberian Branch, Russian Academy of Sciences, 677000, Yakutsk, Russia

    A. V. Prokopiev, O. V. Koroleva, D. A. Vasiliev & M. D. Tomshin

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

    O. P. Polyansky,  V. V. Reverdatto & S. A. Novikova

Authors
  1. A. V. Prokopiev
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  2. O. P. Polyansky
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  3. O. V. Koroleva
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  4. D. A. Vasiliev
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  5. M. D. Tomshin
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  6. V. V. Reverdatto
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  7. S. A. Novikova
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Corresponding author

Correspondence to A. V. Prokopiev.

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The study was performed under the State Assignment of DPMGI, SB RAS and IGM, SB RAS, with a partial support from RFBR (no. 17-05-00848) and SB RAS Presidium (project no. 28).

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Prokopiev, A.V., Polyansky, O.P., Koroleva, O.V. et al. The Mid-Paleozoic and Mid-Triassic Pulses of Trap Magmatism in the East of the Siberian Platform: Evidence from the First 40Ar/39Ar Isotope Dating of Dolerite Sills. Dokl. Earth Sc. 490, 4–7 (2020). https://doi.org/10.1134/S1028334X20010092

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  • DOI: https://doi.org/10.1134/S1028334X20010092

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