Conditions of ferruginous-cherty formations origin (Middle-Dnieper mega-block)
© O.V. Usenko, 2015
The basic idea of existing hypotheses of ferruginous-cherty formations origin is an opinion that the form of iron presence depends on
conditions at the depth of sediments accumulation. It has been shown in this paper with Middle-Dnieper mega-block of the Ukrainian Shield
greenstone structures used as an example that composition of volcanogenic and ferruginous rocks is specified by succession of physical-chemical
interactions on the roof of the layer with partial melting.
Key words: ferruginous formations, the Archean, greenstone structures, physical-chemical interactions, paleo-geodynamic process, hydrothermal ore
deposition, the thickness of litho- sphere.