Abstract
The rocks are alkaline gabbros, calc-alkaline syenites, and nepheline syenites; ulvoespinel, magnetite, and ilmenomagnetite are the iron-titanium oxide minerals. Analysis of mineralogic variations and textural evolution in the oxide minerals with advancing differentiation shows a gradual increase of iron oxides accompanied by a decrease in magnesium, and a decrease of titanium relative to iron oxides.

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