Age and Sources of Metasedimentary Rocks of the Tokur Terrane of the Mongol–Okhotsk Fold Belt: Results of U–Pb and Lu–Hf Isotope Studies

This paper presents the results of U–Pb (LA-ICP-MS) and Lu–Hf isotope studies of detrital zircons from the presumably Permian meta sedimentary rocks of the Tokur terrane. It has been established that the grains of detrital zircons from the meta sedimentary rocks of the Tokur and Ekimchan formations...

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Bibliographic Details
Published in:Doklady earth sciences 2019-06, Vol.486 (2), p.593-597
Main Authors: Zaika, V. A., Sorokin, A. A., Sorokin, A. P.
Format: Article
Language:English
Subjects:
Accretion
Age
Age composition
Cratons
Earth and Environmental Science
Earth Sciences
Formations
Geological time
Geology
Granite
Isotope studies
Isotopes
Lead
Massifs
Paleozoic
Permian
Radiometric dating
Rocks, Metamorphic
Rocks, Sedimentary
Sedimentary rocks
Zircon
Zirconium
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Summary:This paper presents the results of U–Pb (LA-ICP-MS) and Lu–Hf isotope studies of detrital zircons from the presumably Permian meta sedimentary rocks of the Tokur terrane. It has been established that the grains of detrital zircons from the meta sedimentary rocks of the Tokur and Ekimchan formations have a similar age distribution, which indicates the similar (or equal) age of these formations. The youngest zircons in these rocks has a U–Pb age of 326–323 Ma, which determines the lower age limit of the protolith of the rocks. The upper age limit of the formations corresponds to 254–251 Ma, which is the age of the Late Permian granitoids intruded into these formations. The main sources of zircon in the meta sedimentary rocks of the Tokur terrane are the igneous and metamorphic massifs of the southeast framing of the North Asian Craton. The Tokur terrane can be considered as a fragment of the Paleozoic accretionary complex, formed near the southeastern margin of the North Asian Craton.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X19060114