gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2017-8-3-0290gtcrust-431Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSNEW DATA ABOUT AGE AND GEODYNAMIC NATURE OF HAMSARA TERRANENEW DATA ABOUT AGE AND GEODYNAMIC NATURE OF HAMSARA TERRANEShkolnikS. I.ShkolnikS. I.

Irkutsk

Irkutsk

ReznitskyL. Z.ReznitskyL. Z.

Irkutsk

Irkutsk

LetnikovaE. F.LetnikovaE. F.

Novosibirsk

Novosibirsk

ProshenkinA. I.ProshenkinA. I.

Novosibirsk

Novosibirsk

Institute of the Earth’s Crust, Siberian Branch of RASРоссияInstitute of the Earth’s Crust, Siberian Branch of RASRussian FederationV.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of RASРоссияV.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of RASRussian Federation20171310201783557560Copyright © Shkolnik S.I., Reznitsky L.Z., Letnikova E.F., Proshenkin A.I., 20172017Shkolnik S.I., Reznitsky L.Z., Letnikova E.F., Proshenkin A.I.Shkolnik S.I., Reznitsky L.Z., Letnikova E.F., Proshenkin A.I.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/431

On the basis of isotopic-geochemical studies and analysis of geological evidences heterogeneity of Hamsara terrane has been determined. Formation of stationed metamorphosed layers underlying the Hamsara formation occurred not earlier than 630 Ma, probably in the oceanic island arc system. Acidic effusive rocks of Hamsara formation were formed in intraplate condition in the range of 462–464 Ma. Sediments of Hamsara formation couldn’t be the part of island arc system and belong to completely other period of geological region development. This is the time of completion of accretion-collision events in the northern part of Altai-Sayan fragment of CAFB adjacent to the Siberian platform.

On the basis of isotopic-geochemical studies and analysis of geological evidences heterogeneity of Hamsara terrane has been determined. Formation of stationed metamorphosed layers underlying the Hamsara formation occurred not earlier than 630 Ma, probably in the oceanic island arc system. Acidic effusive rocks of Hamsara formation were formed in intraplate condition in the range of 462–464 Ma. Sediments of Hamsara formation couldn’t be the part of island arc system and belong to completely other period of geological region development. This is the time of completion of accretion-collision events in the northern part of Altai-Sayan fragment of CAFB adjacent to the Siberian platform.

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The authors declare that there are no conflicts of interest present.