Conditions of formation of Paleozoic picrite basalt complexes of the basement of the Western Siberian Plate

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Abstract


The carried out researches with the help of 40Ar/39Ar analysis have shown a coincidence of formation (about 490 million years) of Paleozoic picrite and basalt complexes of the basement of the Western Siberian Plate. The data on petrochemistry, geochemistry of rare and rare-earth elements, and also on compositions of clinopyroxenes, testifies to formation of picrites of borehole № 11 (Chkalovsky area) as a result of action of intra plate magmatic systems of oceanic islands - OIB. Calculations on the basis of clinopyroxene compositions speak about considerable parameters of crystallization of picrite porphyrite minerals: 1215-1275 °C, 4.5-8 kbar. As a whole, it is established that considered picrite basalt complexes were formed with the assistance of enriched plume magmatic systems in intra plate conditions of ancient ocean near to its active margin.


V. A. Simonov

Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Email: stupakov@igm.nsc.ru

Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090; 1, Pirogova street, Novosibirsk, 630090

V. A. Kontorovich

Novosibirsk State University; Trofimuk Institute of Petroleum Geology and Geophysics Sibirian Branch of the Russian Academy of Sciences

Email: stupakov@igm.nsc.ru

Russian Federation, 1, Pirogova street, Novosibirsk, 630090; 3, Koptyg prosrect, Novosibirsk, 630090

Corresponding Member of the Russian Academy of Sciences

S. I. Stupakov

Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Author for correspondence.
Email: stupakov@igm.nsc.ru

Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090

Yu. F. Filippov

Trofimuk Institute of Petroleum Geology and Geophysics Sibirian Branch of the Russian Academy of Sciences

Email: PhilippovYF@ipgg.nsc.ru

Russian Federation, 3, Koptyg prosrect, Novosibirsk, 630090

S. V. Saraev

Trofimuk Institute of Petroleum Geology and Geophysics Sibirian Branch of the Russian Academy of Sciences

Email: stupakov@igm.nsc.ru

Russian Federation, 3, Koptyg prosrect, Novosibirsk, 630090

A. V. Kotlyarov

Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Email: stupakov@igm.nsc.ru

Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090

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