geochemical characteristics of titanite and u-pb age of garnet from mineral mines of the southern urals

Mineralogical-geochemical (sims method) study of titanite and geochronological (id-tims method) study of garnets from mineral mines of the southern urals has been carried out. the mineral associations containing titanite belong to four contrasting types: epidote-titanite-garnet (akhmatovskaya mine); garnet-titanite-diopside (akhmatovskaya mine); epidote-titanite-chlorite (nikolaje-maksimilianovskaya mine); chlorite-titanite-garnet (praskovie-evgenyevskaya mine). titanite from mineral aggregates of the akhmatovskaya mine is enriched with lree and th, nikolaje-maksimilianovskaya mine – with hree, hf and ta, praskovie-evgenyevskaya mine – with v, cr, and sr. it was found that the distribution of trace and rare-earth elements in titanite is related both to the composition of paragenetic minerals (garnet and epidote, akhmatovskaya and nikolaje-maksimilianovskaya mines) and to the influence of rock-forming minerals of the parent rock – gabbro (plagioclase and pyroxene, praskovie-evgenyevskaya mine). the age of garnets (504.1±4 ma) determined by id-tims method from silicate-carbonate rocks of the perovskitovaya mine does not agree with the ideas about the formation of the latter as a result of contact metasomatosis synchronous with the introduction of gabbroids or granitoids of the kusa-kopan complex (1,390-1,350 ma), but does not exclude the influence of superimposed contact metasomatosis associated with late endogenous processes.