Gatsenko V. Petrology of high-titaniferous metabasites and apobasitous metasomatites of Golovanevska Sutural zone's Chemerpil structure (Ukrainian Shield)

In the thesis are presented findings of investigation of high metabasites and apobasitous metasomatites belonged to Chemerpilska structure. Chemerpilska structure is situated in Golovanevska Sutural zone of Ukrainian Shield. These roks are fundamentally different from Kapitanivsko-Derenuhinskii komplex metabasites by chemical composition. Up to date there were not revealed roks contaning more than 2% of ТіО2 among old (older than 2 MA) roks of Ukrainian Shield Is established that initial high titanic basites were metamorphized under condition of amphibolite facies. That is authenticated by paragenesis of source minerals and by geothermometers. Hornblende, plagoiclase, biotite, garnet are source minerals. Ilmenite is a hub-mineral for ТіО2. Lack of magnetite and magnetite minal in ilmenite indicates reductive condition of rockforming. We particularized some kinds of high titanic metabasites wich were different by the mineral composition and by the degree of metamorphic reduction. According to our investigations high titanic metabasites of Chemerpilska structure are demonstrations of dyke weak differentiated basites. They are similar to titaniferous gabbride of anorthosite-rapakivi-granite formation or to subalkaline basalts. In some separate parts high titanic metabasites undergone an essential metamorphic changes and their composition became plagoiclase - biotite. In spite of final replacement of dark-colored silicates, ТіО2 content was not reduced (2,71-4,85%). This confirmed lack of titanium migration. Aluminum also is inert. Infusion of potassium and loss of calcium occur in the rocks.