TI-RICH GABBRO OF FEDORIVKA APATITE-ILMENITE DEPOSIT

Abstract

The ores of Fedorivka deposit occuring in a Ti-rich olivine gabbro intrusion within Volodarsk-Volynsky massif of Korosten complex have been investigated. It has been established that mineral composition of the ore gabbro is typical for basic rocks of anorthosite-rapakivi granite association. Distinctive features are intermediate plagioclases An_41-47, ferrous olivines Fa_46-52 and augites Wo_36-40 En_30-35 Fs_26-32 as so as high contents of ilmenites, Ti-magnetites and apatites. It has been determined a rythmic changing of TiO₂, Fe₂O₃, V₂O, MnO and Cr₂O₃, contents in the coexiting ilmenites and magnetites depending on depth. The average weighted chemical chem composition Fedorivka intrusion corresponds to subalkaline olivine ferrobasalt enriched in Ti and P. Geology, mineralogy and petrography of Fedorivka intrusion allow to refer it to layered basic intrusion with genetic relation to Proterozoic massif type anorthosites.