Abstract

Titaniferous iron ore bands in a layered peridotite occurring in basic charnockites near Ongole, Andhra Pradesh (south India), consist of intergrowths of hematite- maghemite-ilmenite-ceylonite and titanomaghemite-ilmenite, along with ilmenite, limonite, and silicates. The primary minerals, formed under high-temperature magmatic conditions, were magnetite (both low and high titanium), ilmenite, and silicates, which, through exsolution and oxidation, have given rise to maghemite, hematite, ilmenite, pleonaste, ulvoespinel, and titanomaghemite. A temperature of 200-400 degrees C for the oxidation of the magnetite is proposed.

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