Catagenetic Mineralization in the Platform Cover of the Mikhailov Deposit, Kursk Magnetic Anomaly

Superimposed catagenetic transformations are sharply expressed at the Mikhailov deposit, Kursk Magnetic Anomaly. They are confined to the base of Devonian and Juarassic rocks, which transgressively overlap martite eluvium formed after jaspilites on the surface of a buried uplift. These processes resulted in the appearance of massive lenticular and domal bodies (sandstones and siltstones cemented by calcite or iron sulfides) among friable terrigenous rocks, ferruginization of limestones and their transformation into sideroplesite ores, and formation of carbonate and pyrite concretions. Secondary processes are likely to be related to both descending waters and confined solutions (often thermal) ascending from the aquiferous horizons in the lower part of the sedimentary cover and basement.