Abstract

Deposits are believed to result from variations in three igneous processes: accumulations of a Fe-Ti rich liquid; injection of a Fe-Ti rich liquid; injection of a Fe-Ti rich mafic pegmatite. Fe-Ti rich liquids were probably generated by filter pressing or liquid immiscibility. Trace elements, particularly the amounts of Cr and V in magnetite and Mn in ilmenite, suggest stage of differentiation of liquids that formed deposits. Fe-Ti ratios of coexisting magnetite and ilmenite may be used to distinguish high-temperature from low-temperature deposits.

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