Abstract
The causes of metasomatic albitization of host rocks and the formation of the accompanying thorium mineralization in uranium deposits of the Streltsovka ore field located in the Streltsovka volcanic caldera are considered. Data provided by the authors and published data allow us to conclude that the process of hydrothermal albitization does not require additional Na input by the magmatogenic fluids. It could have originated from the host rocks due to pre-ore acid leaching; accessory minerals in the same rocks were a source of Th. The increase in the pH value necessary for the deposition of albite under low-T conditions is ensured by a sharp change in the physicochemical conditions due to seismotectonic impulses. The latter were accompanied by opening of the fault and fracture systems, a decrease in pressure (decompression), and degassing. The alkaline character of the fluids that caused albitization is also emphasized by the behavior of trace and rare-earth elements. It is likely that thorium migrated in a sodium alkaline environment probably in the form of mobile tetra- or pentacarbonates: Na4[Th(CO3)4] or Na6[Th(CO3)5].
Similar content being viewed by others
REFERENCES
O. V. Andreeva and V. A. Golovin, Geol. Ore Deposits 40 (3), 184–197 (1998).
Vikt. L. Barsukov, M. A. Pogudina, and O. B. Ryzhov, Dokl. Akad. Nauk SSSR 261 (4), 953–956 (1981).
N. P. Ermolaev and A. V. Garanin, Geol. Rudn. Mestorozhd., No. 3, 49–57 (1978).
G. V. Kalyatskaya and A. N. Strashko, Chemistry and Analytical Chemistry for Uranium and Thorium (Tomsk Univ., Tomsk, 2011) [in Russian].
N. P. Laverov, V. I. Velichkin, B. P. Vlasov, A. P. Aleshin, and V. A. Petrov, Uranium and Molybdenum-Uranium Depositions in the Areas of Continental Intercore Magmatism Development (Schmidt Inst. Phys. Earth, Inst. Geol. Ore Deposits, Petrogr., Mineral., Biochem. RAS, Moscow, 2012) [in Russian].
G. B. Naumov, Geol. Ore Deposits 40 (4), 273–290 (1998).
V. A. Petrov, O. V. Andreeva, and V. V. Poluektov, Geol. Ore Deposits 56 (2), 81–101 (2014).
V. A. Pokrovskii, Dokl. Akad. Nauk SSSR 262 (2), 438–441 (1982).
A. A. Pek, V. I. Malkovsky, and V. A. Petrov, Geol. Ore Deposits 62 (1), 31–49 (2020).
V. L. Rusinov, O. V. Rusinova, and A. A. Kremenetskii, Dokl. Earth Sci. 347 (2), 292–295 (1996).
E. E. Senderov, Ordering Processes for Frame Silicates (Nauka, Moscow, 1990) [in Russian].
L. Xiaodong, M. Cuney, J. Mercadier, T. Riegler, and Y. Chida, Ore Geol. Rev. 122, 103514 (2020).
P. R. L. Browne and A. J. Ellis, Am. J. Sci. 269, 97–131 (1970).
Descriptive Uranium Deposit and Mineral System Models (IAEA, Vienna, 2020).
W. S. Fyfe, Can. Mineral. 12 (7), 439–444 (1974).
Geological Classification of Uranium Deposits and Description of Selected Examples (IAEA, Vienna, 2018), No. IAEA TECDOC-1842.
Z. Guo, T. Li, M. Deng, and W. Qu, Ore Geol. Rev. 122, 103517 (2020).
J. J. Hemley and W. R. Jones, Econ. Geol. 64, 538–569 (1964).
E. Östhols, J. Bruno, and I. Grenthe, Geochim. Cosmochim. Acta 58 (2), 613–623 (1994).
R. G. Skirrow, S. Jaireth, D. L. Huston, E. N. Bastrakov, A. Schofield, S. E. van der Wielen, and A. C. Barnicoat, Geoscience Australia Record No. 2009/20 (2009).
ACKNOWLEDGMENTS
The authors are sincerely grateful to O.A. Doinikova for her help in this work and useful criticism.
Funding
This work was carried out within the framework of a State Assignment of the Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences “Tectonodynamic and Physicochemical Conditions of the Development of Mineral Systems of the Main Industrial and Genetic Types of Uranium Deposits.”
Author information
Authors and Affiliations
Corresponding authors
Ethics declarations
The authors declare that they have no conflicts of interest.
Additional information
Translated by D. Voroshchuk
Rights and permissions
About this article
Cite this article
Andreeva, O.V., Petrov, V.A. & Poluektov, V.V. Albite Metasomatic Rocks and Thorium Mineralization in Uranium Deposits of the Volcanogenic Type (Example of the Streltsovka Ore Field, East Transbaikalia). Dokl. Earth Sc. 507, 1001–1006 (2022). https://doi.org/10.1134/S1028334X22600918
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1028334X22600918