Email this article Lead isotope sign of the mantle contribution in tin ore deposits (by the example of Khingan-Badjal-Komsomol belt, Far East Russia)
- Authors: Chernyshev I.V.1, Chugaev A.V.2, Bortnikov N.S.3
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Affiliations:
- Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academy of Science
- Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences
- Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences
- Issue: Vol 525, No 1 (2025)
- Section: GEOLOGY OF ORE DEPOSITS
- Submitted: 03.07.2025
- Accepted: 14.07.2025
- Published: 20.08.2025
- URL: https://journal-vniispk.ru/2686-7397/article/view/299063
- ID: 299063
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Abstract
Using the high-precision (±0.02%) MC-ICP-MS method, the lead isotopic composition of galena from four Late Cretaceous (95-85 Ma) tin ore deposits of the Khingan-Bajal-Komsomolskaya metallogenic zone (KhBKZ), which is part of the Khingan-Sikhote-Alin ore province (KhSAP), was studied. In comparison with other previously studied KhSAP tin deposits, the KhSAP ore lead has lower isotopic ratios ranging as 206Pb/204Pb = 18.359-18.497, 207Pb/204Pb = 15.565-15.588, and 208Pb/204Pb = 38.369-38.404. In the 206Pb/204Pb-207Pb/204Pb diagram, the points of the KhBKZ lead isotopic compositions of the are located significantly below of orogenic evolution curve (according to the Zartman-Doe model) and the average crustal curve (µ2 = 9.74) according to the Stacey-Kramers model. According to these evolutionary characteristics, as well as the values of the Th/U parameter and the Tm model age, the KhBKZ ore lead differs from KhCAP lead, indicating a significant difference in the geochemical and geodynamic conditions of the KhBKZ deposits formation. In particular, it indicates a limited contribution of the continental crust, a significant role of mantle lead origin and the participation of a regional mantle source in the formation of tin-bearing granitoid magmas. Model calculations of the lead balance of mantle and crustal sources in the ore lead of KhCAP and KhBKZ show that for KhCAP the contribution of the mantle source was less than 50%, and, in the case of KhBKZ, it could reach 70-90%. Perhaps the main geological factor that caused the noticeable participation of mantle lead in the KhBKZ deposits was the environment of their formation: unlike the KhCAP, these deposits were formed in the environment of a transform margin, when due to the interaction of moving plates, a larger admission of mantle into the zone of granite formation and ore deposition occurred. Under these conditions, the oceanic plate could breakaway with the admission of the hot asthenosphere into the accretion prism.
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About the authors
Igor Vladimirovich Chernyshev
Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academy of Science
Author for correspondence.
Email: cheriv1935@gmail.com
Academician of the Russian Academy of Sciences, Head of Laboratory, Laboratory of Isotope Geochemistry and Geochronology
Russian Federation, Staromonetny Lane, 35, Moscow 119017, RussiaAndrey Vladimirivich Chugaev
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences
Email: vassachav@mail.ru
Candidate of Geological and Mineralogical Sciences, Leading Researcher, Laboratory of Isotope Geochemistry and Geochronology
Russian Federation, Staromonetny Lane, 35, Moscow 119017, RussiaNikolay Stefanovich Bortnikov
Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences
Email: bns@igem.ru
Academician of the RAS, Scientific Supervisor of IGEM RAS
Russian Federation, 35 Staromonetny per., Moscow 119017References
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