ТИПІЗАЦІЯ ГРАНІТОЇДНИХ УТВОРЕНЬ ТА ЇХ РУДОНОСНІСТЬ

This paper discusses the data on problems of typification of granitic formations and their possible metallogenic content. Among existing principles of classification the most useful as to metallogenic point of view is an international typification of granites with distinguishing І- and S-types which has been offered by australian scientists B.W. Chappell and A.J.R. Whіte [Chappell, White, 2001]. It definitely corresponds to the principles of regional classification proposed by I.B. Shcherbakov [Shcherbakov, 2005] for typification of granitoids of the Ukrainian Shield with distinguishing apobasitic and apopelitic suites of granites. According to classification of B.W. Chappell, A.J.R. Whіte, orogenic granites can be subdivided on the basis of protolytith composition into melt products of predominantly igneous (I-type) or sedimentary (S-type) parent rocks. I-type granitoids comprise varieties ranging in composition from tonalites (quartz-diorites) to granodiorites and are characterized by the presence of biotite, sphene, amphibole, clinopyroxene as iron-magnezian mineral, and magnetite. Granitic formations of S-type correspond in composition to varieties from adamellites (quartz-monzonites) to granites and are characterized by presence of muscovite and red-brown (Tі-rich) biotite and commonly garnet and cordierite. Accessory phases are presented by monazite, uraninite and ilmenite. Among the major parameters which can influence metallogenic specialization of granitic complexes are following: type of granite protolytith; possible trend of evolution of composition; fractionation degree; oxidation state.