Comparative analysis of geochemistry (including major oxides, Li, Rb, Cs, Ba, Sr, Be, F, B, Pb, Zn, Sn, Ag, Co, Ni, Cr, V, Cu, Mo, Nb, Zr, Hf, U, Th, Y, and REE) and dating of two compositionally different Paleozoic intrusions in the West-Stanovoy zone of Transbaikalia showed their palingenic origin and independent evolution. The two plutons belong to two different magmatic complexes: the Early Paleozoic Krestovsky quartz-diorite-granodiorite-granite complex and the Late Paleozoic Olekma granite-leucogranite complex. New Rb-Sr age determinations of the Olekma granitoids (343± 7.6 Ma (I0 = 0.7060± 0.0024) for biotite and leucocratic granites and 318± 8.4 Ma (I0 = 0.7052± 0.0009) for leucogranite and aplite dikes) attest to the Late Paleozoic age of the Olekma complex rather than Early Paleozoic as it was believed earlier. The new results are in agreement with published data on high-grade granites of rheomorphic domes in the neighboring region of the Yablonovy Range (Khilok-Vitim zone). The palingenic granite formation in the West-Stanovoy zone must be related to the geodynamic evolution of the latter in a setting of active continental margin at least since the Early Carboniferous.

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