Redox and nonredox reactions of magnetite and hematite in rocks

摘要: Abstract Redox and nonredox reactions causing pseudomorphic replacement of hematite by magnetite are compared. Pseudomorphic replacements resulting from redox known as martitization [replacement due to oxidation; reaction (1)] mushketovitization reduction; (2)]. These two cause characteristic ore textures volume changes (reaction (1): increase 1.66%; (2): decrease 1.64%). small the reason that widespread in many rocks under condition, however, oxidizing or reducing fluids (solutions) present. The same initial end products may also be involved reactions. Reaction (3) is simple addition Fe 2+ atoms basic conditions. This causes an 47.6%. (4), a 32.2%, leaching acidic From these it concluded (4) occur rock types, whereas restricted unlithified sediments only. However, caused unknown therefore their occurrence hypothetical.