Abstract
Discussed in this paper are the processes of albitization and iron activation during the formation of iron deposits, the transport and hydrolysis of iron, chemical reaction characteristic of wall-rock alteration responsible for the localization of iron deposits, the dynamic factors affecting these reactions and systematic variations in pH of ore-forming solutions. A metasomatic series of Na→ Ca→ Fe is noticed when diorite and dark minerals + anorthite + quartz react with 1–3m NaCl solutions at 400°–500°C. Hydrolysis of FeCl2 has been experimentally studied as a function of temperature and pressure. It is suggested that the pH of ore-forming solutions varies in the direction of alkalic→intermediate→acid→intermediate←kalic from early to late stages.
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