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• W2361036620 abstract "The magmatic-hydrothermal system-related iron deposits include magmatic V-Ti magnetite deposits,apatite-magnetite deposits,iron skarn deposits and submarine volcanic-hosted iron deposits. The ore-related igneous rocks have a wide spectrum,ranging from basic-ultrabasic,intermediate to intermediate-felsic rocks. The magmatic V-Ti magnetite deposit are associated with basicultrabasic plutonic intrusions. These deposits are formed during the magma evolution,particularly fractional crystallization. We proposed that the thick stratiform Fe-Ti magnetite ore layers can be attributed to intergration of Ti-rich ferropicritic magma,fractional crystallization,frequent magma replenishment coupling with the sorting of magma flowing. However,whether the V-Ti magnetite ores ccur in the lower or upper part of the layering intrusion depends on the intitial fO2of the parent magmas. The elevated fO2could lead to an early crystallization phase of magnetites,accumulating at the base of the magma chamber,whereas low-grade disseminated ores occur at the upper part due to low oxygen fugacity. Although field observations support the genesis of immiscible apatite-magnetite magmas for the Proterozoic anorthosite complex,there are no such experiments for this viewpoint so far as now. Some apatite-magnetite deposits may be linked to immisciblity,which could be caused by addition of crustal P by contamination. Except for the above iron deposits,other magmatism-related iron deposits are formed by post-magma-hydrothermal processes. These iron deposits exhibit similar alteration and mineralization patterns,reflecting the similar physico-chemical conditions. The previous studies on experiments and fluid inclusions show that the amounts and compositions of exsolution of fluids from melt are controlled by many factors during the magmafluid transition. The frational crystallization and assimilations of carbonate rocks and evaporites could lead to elevated Cl concentration of exsoluted fluids. In an oxidized fluid,more of the sulphur would be present as SO42-and would thus greatly limit the intergration of Fe and S as pyrite at high temperatures,favoring the transportation of Fe as chloride complexes. A long-term stable convective circulation system is a prerequisite for the formation of a large-sized high-grade iron deposit. Multiple pulses of magma emplacement or a stable magma chamber and a fault /fissure system suitful for fluid circulation at a relative close envirnment( e. g.,impermeable barrier or cap rock may insulate the hydrothermal system) is in turn a prerequisite of the long-term stable convective circulation system.However,the different geological circumstances may result in different ways and sites of iron precipation,which controls the textures and structures of ores as well as the occurrences of iron orebodies." @default.
• W2361036620 created "2016-06-24" @default.
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• W2361036620 date "2014-01-01" @default.
• W2361036620 modified "2023-09-24" @default.
• W2361036620 title "Enrichment mechanism of iron in magmatic-hydrothermal system" @default.
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