Titaniferous magnetite deposits are commonly associated with which rock types?

Titaniferous magnetite deposits are commonly associated with which rock types?

• A. Felsic volcanic rocks
• B. Mafic and ultramafic intrusive bodies
• C. Mafic volcanic rocks
• D. Sedimentary limestone

Answer: (C)

Titaniferous magnetite forms from high-temperature crystallization of Fe-Ti oxides in mafic to ultramafic magmas. In mafic volcanic rocks, basaltic to andesitic magmas crystallize magnetite and titanomagnetite early as they cool, allowing these oxides to concentrate as disseminations or cumulate layers. This makes mafic volcanic rocks a common host for titaniferous magnetite deposits because they supply both iron and titanium in the right proportions at the right temperatures. Felsic volcanic rocks are too silica-rich and Ti-poor to favor large Fe-Ti oxide accumulations. Limestone is unrelated to igneous oxide deposition, and while titanomagnetite can occur in intrusive settings, the association most characteristic in this context is with mafic volcanic rocks.

Titaniferous magnetite forms from high-temperature crystallization of Fe-Ti oxides in mafic to ultramafic magmas. In mafic volcanic rocks, basaltic to andesitic magmas crystallize magnetite and titanomagnetite early as they cool, allowing these oxides to concentrate as disseminations or cumulate layers. This makes mafic volcanic rocks a common host for titaniferous magnetite deposits because they supply both iron and titanium in the right proportions at the right temperatures. Felsic volcanic rocks are too silica-rich and Ti-poor to favor large Fe-Ti oxide accumulations. Limestone is unrelated to igneous oxide deposition, and while titanomagnetite can occur in intrusive settings, the association most characteristic in this context is with mafic volcanic rocks.