Sources of the Upper Proterozoic Terrigenous Deposits in the Northwestern Part of the Argun Massif, Central Asian Fold Belt: Results of U–Th–Pb Geochronological and Sm–Nd Isotopic-Geochemical Studies

— The publication presents the results of geochemical, isotopic-geochemical (Sm–Nd) and isotopic-geochronological (U–Th–Pb) studies of terrigenous rocks of the Middle Riphean (?) Nadarov Formation and the Upper Riphean (?) Nortui Formation of the northwestern part of the Argun continental massif. Th...

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Bibliographic Details
Published in:Stratigraphy and geological correlation 2024-06, Vol.32 (3), p.175-200
Main Authors: Smirnova, Yu. N., Kurilenko, A. V., Dril, S. I., Khubanov, V. B.
Format: Article
Language:English
Subjects:
Archaeology
Deposits
Earth and Environmental Science
Earth Sciences
Formations
Geochemistry
Geochronology
Geophysics/Geodesy
Historical Geology
Igneous rocks
Lead
Massifs
Precambrian
Radiometric dating
Sedimentary rocks
Sedimentology
Silica
Structural Geology
Terrigenous sediments
Zircon
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Summary:— The publication presents the results of geochemical, isotopic-geochemical (Sm–Nd) and isotopic-geochronological (U–Th–Pb) studies of terrigenous rocks of the Middle Riphean (?) Nadarov Formation and the Upper Riphean (?) Nortui Formation of the northwestern part of the Argun continental massif. The composition of the deposits indicates the presence of formations of various silica content in the source area. According to Sm–Nd data, sedimentary rocks of the Nadarov and Nortui formations are characterized by negative values of ε Nd(t) = –6.6…–3.5 at Early Proterozoic values of Nd model age (t Nd(DM) = 2.0–1.8 Ga). The U–Th–Pb dating of detrital zircon grains showed that the lower age limit of accumulation of terrigenous deposits of the Nadarov and Nortui formations falls to the Late Riphean (~775 and ~ 744 Ma, respectively). The main provenance areas for them were Late Riphean igneous rocks, with participation of Early Proterozoic rocks occurring in the Argun Massif.
ISSN:0869-5938
1555-6263
DOI:10.1134/S0869593824030079