Major epochs of instrusive magmatism of Kuznetsk Alatau, Altai, and Kalba (from U-Pb isotope dates)

We present new U-Pb isotope dates for zircons from intrusive rocks of Kuzne tsk Alatau, Gorny Altai, Rudny Altai, and Kalba and generalize the earlier published results of geochronological studies in these regions (U-Pb and Rb -Sr dates). Comparison of radiological ages with geological data permitted us to refine the scale of intrusive-magmatism events and recognize seven ma jor epochs corresponding to a successive change of geodynamics settings: V- E-1 - accretion-subductional,related to the evolution of sea-marginal-islan d-arc systems of the Paleo-Asian ocean; E-2-O-1 - accretion-collisional; D- 1-D-3(1) and D-3(2)-C(1)t - accretion-subductional, related to the evolutio n of active continental margin of the Andean type; C(1)v-C-3 - accretion-co llisional, related to the oblique collision of the Dzhungar microplate wit the Siberian continent and closure of the Ob'-Zaisan paleoocean basin; P-1- T-2 - postcollisional, realized in the strike-slip fault-disjoining regime and T-3-J(1) - within-plate magmatism.