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Setting of the Formation of Paleozoic Picrite Basalt Complexes in the West Siberian Plate Basement

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Abstract

40Ar/39Ar analysis showed a simultaneous (at about 490 Ma) formation of the Paleozoic picrite and basalt complexes of the West Siberian Plate basement. The petrochemistry, trace and REE geochemistry, and composition of clinopyroxene indicate the formation of the picrite of well no. 11 (Chkalov area) as a result of intraplate magmatism of the OIB type. Calculations based on the compositions of clinopyroxene allowed crystallization of minerals of porphyric picrite at 1215–1275°C and 4.5–8 kbar. In general, it has been found that the picrite basalt complexes considered were formed from enriched igneous plume systems under intraplate conditions near the active margin of the ancient ocean.

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FUNDING

This work has been carried out within the framework of a state program of the Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences (project no. 0330–2016–0014) and the Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, with the support of the Ministry of Science and Higher Education of the Russian Federation.

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Authors and Affiliations

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

    V. A. Simonov, S. I. Stupakov & A. V. Kotlyarov

  2. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    V. A. Kontorovich, Yu. F. Filippov & S. V. Saraev

Authors
  1. V. A. Simonov
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  2. V. A. Kontorovich
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  3. S. I. Stupakov
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  4. Yu. F. Filippov
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  5. S. V. Saraev
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  6. A. V. Kotlyarov
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Corresponding authors

Correspondence to V. A. Simonov or S. I. Stupakov.

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Translated by A. Larionov

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Simonov, V.A., Kontorovich, V.A., Stupakov, S.I. et al. Setting of the Formation of Paleozoic Picrite Basalt Complexes in the West Siberian Plate Basement. Dokl. Earth Sc. 486, 613–616 (2019). https://doi.org/10.1134/S1028334X19060217

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  • DOI: https://doi.org/10.1134/S1028334X19060217

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