How is ilmenite formed in igneous deposits?
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Ilmenite in igneous deposits is primarily formed through various processes such as solid-state exsolution, reduction reactions, and fractional crystallization. In the case of ilmenite inclusions in amphibole from the Dabie UHP metamorphic terrane, China, different groups of ilmenite show specific crystallographic orientation relationships with the host amphibole, indicating formation via solid-state exsolution and reduction reactions . Additionally, ilmenite in layered gabbro and troctolitic zones of the Sept-Iles Complex, Quebec, is linked to the separation of an immiscible Fe-Ti oxide-apatite melt through fractional crystallization . Furthermore, ilmenite in Proterozoic anorthosite massifs like Lac Tio – Lac Allard, Quebec, is interpreted as a magmatic phase segregated from Fe-Ti-enriched residual magmas by gravitational settling after anorthosite crystallization . These diverse mechanisms contribute to the formation of ilmenite in igneous deposits.
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| Ilmenite in igneous deposits forms through fractional crystallization processes, involving stages with ilmenite-plagioclase cumulates and later ilmenite-plagioclase-orthopyroxene-olivine cumulates, influenced by changing oxygen fugacity. | |
| Ilmenite is formed in igneous deposits as an important mineral in igneous and metamorphic rocks, serving as a key feedstock for the titanium industry. | |
30 Citations | Ilmenite in igneous deposits forms as a magmatic phase through gravitational settling from residual Fe-Ti-enriched magmas after anorthosite crystallization, under oxygen-closed conditions favoring Fe3+ incorporation. |
| Ilmenite in igneous deposits like the Sept-Îles, Québec, Canada, forms through the separation of an immiscible Fe-Ti oxide-apatite melt enriched in Fe, Ti, and other elements during fractional crystallization. | |
2 Citations | Ilmenite in igneous deposits can form through solid-state exsolution during cooling or reduction reactions in an open system, with formation temperatures estimated between 1025-1126°C. |
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