Late Vendian postcollisional leucogranites of Yenisei Ridge

The Late Vendian (540–550 Ma) U–Pb zircon age of postcollisional granitoids in the Osinovka Massif was obtained for the first time. The Osinovka Massif is located in rocks of the island-arc complex of the Isakovka Terrane, in the northwestern part of the Sayany–Yenisei accretion belt. These events s...

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Bibliographic Details
Published in:Doklady earth sciences 2017-06, Vol.474 (2), p.674-679
Main Authors: Nozhkin, A. D., Likhanov, I. I., Reverdatto, V. V., Bayanova, T. B., Zinoviev, S. V., Kozlov, P. S., Popov, N. V., Dmitrieva, N. V.
Format: Article
Language:English
Subjects:
Accretion
Composition
Continental crust
Cratons
Deposition
Dimensions
Earth and Environmental Science
Earth Sciences
Fragmentation
Fragments
Geochemistry
Geochronometry
Geological time
Granite
History
Island arcs
Isotopes
Magma
Oceanic crust
Radiometric dating
Rock
Rocks
Thrust
Zircon
Zirconium
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Summary:The Late Vendian (540–550 Ma) U–Pb zircon age of postcollisional granitoids in the Osinovka Massif was obtained for the first time. The Osinovka Massif is located in rocks of the island-arc complex of the Isakovka Terrane, in the northwestern part of the Sayany–Yenisei accretion belt. These events stand for the final stage of the Neoproterozoic history of the Yenisei Ridge, related to the completing accretion of the oceanic crust fragments and the beginning of the Caledonian orogenesis. The petrogeochemical composition and the Sm–Nd isotopic characteristics support the fact that the granitoid melt originated from a highly differentiated continental crust of the southwestern margin of the Siberian Craton. Hence, the granite-bearing Late Riphean island-arc complexes were thrust over the craton margin at a distance considerably exceeding the dimensions of the Osinovka Massif.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X17060125