Abstract
The paper material is devoted to the research of crystallomorphology, accessory ilmenite expansion, characteristic features of its chemical composition, paragenetic association and conditions for mineral formation in Devonian granitoids of the polyphase Aleisk-Zmeinogorsk complex. Two ilmenite generations formed at various crystallization stages of the magmatic melt have been identified by the morphological features of the ilmenite crystals, chemical composition and paragenesis. Early-magmatic Ilmenite1 singled out at the protocrystallization stage during reduction and weakly-oxidizing environment conditions. It is characterized by the crystalline-faced shapes, low content of the pyrophanite minal and V admixture. Ilmenite 2 singled out at the major crystallization stage of the melt in the conditions of higher oxygen fugacity as the forms of the flattened, xenomorphic grains with the enhanced pyrophanite concentration and Nb admixture.
Highlights
Speaking, Rudny Altai is considered to be a unique metallogenic province with the precious, rare and iron-ore deposits
The problems on the geochemical trend and potential granitoids ore-bearing in Aleisk-Zmeinogorsk complex (D2–3), which occupies the larger part of the north-west of Rudny Altai, are obscure and nowadays relevant
The absence of accessory ilmenite grains in the third leucoplagiogranite intrusion phase is due to the oxygen activity increase during their formation
Summary
Rudny Altai is considered to be a unique metallogenic province with the precious, rare and iron-ore deposits. Target of the research is to analyze accessory ilmenite distribution relationships as the essential mineral and Ti concentrator, characteristic features of its crystallomorphology and chemical composition in granitoids of the successive intrusive phases. This occurs in granitoids of the second, third and the final (the fourth) intrusion phases among the accessory minerals. Ilmenite is a low-magnetic and electromagnetic fraction in the association with the titanomagnetite, hematite, ferrorutile, and forms low concentrations in granitoids; is irregularly distributed both along the plagiogranits massif area in the major phase, and in the derivatives of the successive phases.
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