Age and Sources of Lower Mesozoic Metasedimentary Rocks of the Un’ya-Bom Terrane in the Mongol–Okhotsk Fold Belt: Results of U–Pb Geochronological (LA-ICP-MS) and Sm–Nd Isotope Studies
- Authors: Zaika V.A.1, Sorokin A.A.1, Kovach V.P.2, Sorokin A.P.1, Kotov A.B.2
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Affiliations:
- Institute of Geology and Nature Management, Far East Branch, Russian Academy of Sciences
- Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences
- Issue: Vol 484, No 2 (2019)
- Pages: 115-119
- Section: Geology
- URL: https://journals.rcsi.science/1028-334X/article/view/194578
- DOI: https://doi.org/10.1134/S1028334X19020089
- ID: 194578
Cite item
Abstract
The results of U–Th–Pb geochronological study indicate that the youngest peaks on the relative probability curves of the age obtained for the Un’ya-Bom terrane correspond to ages of 207 and 212 Ma. These values were obtained for zircons from the meta-aleurolite samples from the Kurnal and Amkan formations, respectively. Similar age estimates for the youngest peaks were also obtained in the case of detrital zircons from the metasedimentary rocks of the Tukuringra terrane in the eastern part of the Mongol–Okhotsk fold belt, which indicates that, within the belt, Lower Mesozoic flyshoid complexes are much more widespread than was assumed. Based on the geochronological and Sm–Nd isotopic data obtained, it was shown that the material was carried to the sedimentation basin mainly from the continental massifs of the Amur superterrane.
About the authors
V. A. Zaika
Institute of Geology and Nature Management, Far East Branch, Russian Academy of Sciences
Author for correspondence.
Email: akotov@peterlink.ru
Russian Federation, Blagoveshchensk
A. A. Sorokin
Institute of Geology and Nature Management, Far East Branch, Russian Academy of Sciences
Email: akotov@peterlink.ru
Russian Federation, Blagoveshchensk
V. P. Kovach
Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences
Email: akotov@peterlink.ru
Russian Federation, St. Petersburg
A. P. Sorokin
Institute of Geology and Nature Management, Far East Branch, Russian Academy of Sciences
Email: akotov@peterlink.ru
Russian Federation, Blagoveshchensk
A. B. Kotov
Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences
Email: akotov@peterlink.ru
Russian Federation, St. Petersburg