A new genetic type of apatite-ilmenite ores in the gabbro-anorthosite massifs of the Korosten' pluton (Ukrainian Shield)

Petrology and Mineralization of the Gabbro-Anorthosite Massifs of the Ukrainian Shield

“…The contacts are often tectonic and discordant. The anorthosites have undergone active metamorphogenic-metasomatic alteration under the influence of the granites, with the formation of zoned com plexes [18].…”

“…The contact metamorphic-metasomatic transformations of the anorthosites proceeded strictly in accordance with successive complication of the ore aggregates and increase in the concentration of the ore minerals and apatite at the front of the developing oremetasomatic column. The contact metamorphism, according to Tarasenko and Panskikh [18], was accompanied by mobilization and removal of a (Table 3).…”

“…In the large K-feldspar ovoids, there are small inclusions of quartz, oligo clase, and pyroxene. Plagioclase (20-30%) forms tabular independent grains with typical polysynthetic twinning (An 25-32 ), and also more sodic (An [15][16][17][18][19][20] rounded small inclusions in the K-feld spar. Quartz (15-20%) has been found in the form of equant or irregularly shaped phenocrysts, and the xenomorphic grains are developed in the interstices of K-feldspar and plagioclase.…”