U-Pb age and trace elements composition of titanite from granites of Belokurikhinsky massif, Gorny Altai

As a result of isotope-geochemical study, the age data (U-Pb method, ID-TIMS) titanite from first phase granites Belokurikhinsky granite massif, Gorny Altai, were obtained for time. The concordant value 255 ± 2 Ma coincides within margin error with previously published results dating micas second and third phases Belokurikha massif by Ar-Ar method (250 3 Ma). At same time, differ significantly values (232 5 Ma, U-Pb monofraction zircon grains; 245 8 Rb-Sr whole rocks). Therefore, there is every reason to narrow time interval formation 255-250 Ma. study trace element composition SIMS demonstrated their zonal structure. central part grain differs rim noticeably higher content REE, Cr, Y, Nb. V, Zr Ba decreases lesser extent towards rim, Sr U remains constant. REE distribution spectra in parts are conformal each other, having convex spectrum LREE concave one HREE. Titanite characterized negative Eu-anomaly, depth which grain. A Eu-anomaly indicates co-crystallization plagioclase. correspond characteristics typical magmatic granitoids metamorphic titanite.