Lithogeochemistry of fine-grained Vendian clastic rocks of the Nepa dome, Siberian Platform

Abstract

It is conducted lithogeochemical investigation of Vendian fine-grained clastic sediments composed Talakh, Parshinsk (Nepa horizon) and Byuk suites (Tyre horizon) of some wells core material in Nepa dome of Nepa-Botuoba anteclise, Siberian Platform. Pelites of all three suites are characterized by variations in the composition from the sandstones to clays, with an increase in clay component up to the section, and have a common geochemical specifics. With moderately alkaline composition they belong to the class of high-K rocks, indicating similar environment of pelite formation due to bring in a shallow marine basin of Vendian passive continental margin the material of chemical weathering platform crusts in conditions of humid climate. Very likely, the source of sediments was the rocks crustal basement of the Siberian platform with possible participation Riphean sediments