ИСТИНА

The report presents the results of a 5-year study of the Early Proterozoic complexes of the Olekma block of the Aldan province of the Siberian craton.The main objects were chosen approximately coeval postcollision complexes: granite massifs of the kodar complex with ages of 1873+/-3 Ma and 1877+/-4 Ma, gabbroids of China (1867+/-3 Ma) and Kuranakh complexes (1863+/-9 Ma). Mean paleomagnetic pole for 3 complexes is Plat=-21.7 Plong=96.1 A95=11.6. This pole falls like was expected in begin of the Early Proterozoic APWP Siberia (Didenko et al., 2015). With the introduction of the correction by the opening Vilyui rift by hypothesis (Pavlov et al., 2008) it is shifting towards younger poles, allowing a few to doubt this hypothesis with regard to Olekma block. Comparing the data obtained with the known the Early Proterozoic poles of the south Siberia, one can conclude that the rigidity of the craton starting around 1.86 Ga.