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DEFECTS OF MAGMA FORMATION ANALYSIS

V. L. Khomichev 1, N. E. Egorova 2

1 Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia; 2 Institute of Surface Management of Irkutsk National Research Technical University, Irkutsk, Russia

The formation analysis of igneous rocks is a great achievement of the Soviet science in terms of classifying natural communities of magmatic rocks for the purpose of forecasting and prospecting of associated deposits. But due to the complexity of the problem itself, the uncertainty of boundaries between formational types in the practice of geological works, there are numerous defects that were clearly observed during the regional and interregional correlation of magmatic complexes of the Altai-Sayan region and Yenisey Ridge. The reasons and consequences of these defects, ways of their correction are analyzed.

Keywords: magmatic formations and complexes, validity criteria, defects of allocation and mapping.

DOI 10.20403/2078-0575-2021-1-3-17