Open AccessEffect of Trap Magmatism on the Geochemistry of Gases in the North-Western Regions of the Siberian Platform
Author(s) -
A. O. Gordeeva,
Д. А. Новиков,
F. F. Dultsev,
А. В. Черных
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/666/5/052055
Subject(s) - magmatism , ordovician , methane , geochemistry , intrusion , geology , hydrocarbon , carbon dioxide , chemistry , paleontology , organic chemistry , tectonics
Results of the studies into the effect of trap magmatism on the geochemistry of gases (free and dissolved in water) and their zoning within the boundaries of north-western regions of the Siberian Platform are reported. The maximal paleotemperatures at the moment of trap intrusion reached 650 °C at the contact for the major productive horizons: Silurian (Devilish), Ordovician (Baikit), and Cambrian (Deltulino-Tanachinsky, Abakunsky, and Moktakonsky). Hydrocarbon gases in the free and water-dissolved phases were subjected to degradation in the most active form. For instance, carbon dioxide dominates, with its content more than 90 vol. % and methane content up to 5 vol. % in intrusion-affected zone at a distance up to 100 m, while at a distance of 250 m CO 2 concentration decreases to 30 vol. %, and CH 4 concentration increases to 60-70 vol. %. No significant effect of the thickness of intrusion on gas composition was revealed.