Open AccessConditions of formation of Paleozoic picrite basalt complexes of the basement of the Western Siberian Plate
Author(s) -
В. А. Симонов,
В. А. Симонов,
Vladimir Kontorovich,
Vladimir Kontorovich,
S. I. Stupakov,
S. I. Stupakov,
Yu. F. Filippov,
Ю Ф Филиппов,
S.V. Saraev,
S.V. Saraev,
A.V. Kotlyarov,
А В Котляров
Publication year - 2019
Publication title -
doklady akademii nauk. rossijskaâ akademiâ nauk
Language(s) - English
Resource type - Journals
ISSN - 0869-5652
DOI - 10.31857/s0869-56524865577-582
Subject(s) - geology , geochemistry , basalt , petrochemistry , paleozoic , mantle plume , basement , earth science , tectonics , paleontology , archaeology , lithosphere , history
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.