Conditions of Diatomites Formation in the Primorye (South of the Russian Far East)

Abstract

The analysis of diatomaceous deposits in the South of the Russian Far East allowed us to determine the taxonomic composition of the diatom flora and assess its qualitative (ecological) and quantitative traits. The obtained data enabled us to identify biofacies associated with the conditions of diatomite formation and reveal the reasons behind it. Possible reasons of high diatom productivity in the Neogene could be: development of a dense system of rivers and lakes; a long growing season under the conditions of a tropical monsoon climate with mild winters; active volcanic activity, the eruption products of which were the source of materials needed for the formation of valves and supporting the life activity of diatoms.