Tectonic Nature of the Ul’ban Terrane (Mongol–Okhotsk Fold Belt): Results of U–Pb and Lu–Hf Isotope Studies of Detrital Zircons

The U–Pb and Lu–Hf isotope studies of detrital zircons from Mesozoic metasedimentary rocks of the Sorukan and Naldinda formations of the Ul’ban terrane are performed for the first time. It is shown that Early Precambrian zircons are almost completely absent in these rocks, while Early Mesozoic zirco...

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Bibliographic Details
Published in:Doklady earth sciences 2020-05, Vol.492 (1), p.297-301
Main Authors: Zaika, V. A., Sorokin, A. A.
Format: Article
Language:English
Subjects:
Accretion
Belts
Cratons
Earth and Environmental Science
Earth Sciences
Framing
Geology
Isotope studies
Isotopes
Lead
Mesozoic
Paleozoic
Precambrian
Rock
Rocks
Rocks, Sedimentary
Tectonics
Tectonics (Geology)
Zirconium
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Summary:The U–Pb and Lu–Hf isotope studies of detrital zircons from Mesozoic metasedimentary rocks of the Sorukan and Naldinda formations of the Ul’ban terrane are performed for the first time. It is shown that Early Precambrian zircons are almost completely absent in these rocks, while Early Mesozoic zircons with Paleozoic, Neoproterozoic, and Mesoproterozoic Hf model ages dominate. Based on the data obtained, it is assumed that the Ul’ban terrane is a part of the accretionary complex of the northern framing of the Amur superterrane and is neither a depression superimposed on the Paleozoic formations of the Mongol–Okhotsk belt nor an accretionary complex in the southern framing of the North Asian Craton, as was believed earlier.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X20050232