Thorium phosphate: New mineral phase (Middle Timan, Komi Republic)
https://doi.org/10.52349/0869-7892_2021_87_100-117
Abstract
In four places within the Middle Timan a new mineral phase thorium phosphate was found in the form of individual grains and their aggregates. The phase turned out to be Xray amorphous. The chemical composition and some physical properties of the two varieties of the new phase have been studied. The grains of the thorium phase from the Ichetyu occurrence are characterized by high calcium, iron, sulfur, carbon contents that suggests wide isomorphism in both the cationic and anionic parts of this compound: (Th, Ca, Fe) · · [(PO4) (SO4) (CO3)] × nH2O. The CHIME method was used to estimate the transformation age of this phase in the Ichetyu occurrence. It turned out to be unexpectedly very young – 52.7 ± 6.1 Ma (Early Paleogene). It is assumed that this is the time of exhumation of the primary bedding of the Ichetyu conglobreccia layer, which became accessible to saline meteoric waters and their interaction with the unstable radioactive phase of the thorium phosphate, which resulted in the complication of its composition.
About the Authors
A. B. Makeev
Institute of Ore Geology, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences
Russian Federation
Russian Federation
Doctor of Geological and Mineralogical Sciences, Leading Researcher, Professor, Laboratory of Ore Deposits Geology
B. A. Makeev
Institute of Geology of the Komi National Center of the Ural Branch of the RAS (FTC Institute of Geology Komi SC UB RAS)
Russian Federation
Russian Federation
Candidate of Geological and Mineralogical Sciences, Researcher
S. E. Borisovskiy
Institute of Ore Geology, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences
Russian Federation
Russian Federation
Candidate of Geological and Mineralogical Sciences, Researcher
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Review
For citations:
Makeev A.B., Makeev B.A., Borisovskiy S.E. Thorium phosphate: New mineral phase (Middle Timan, Komi Republic). Regional Geology and Metallogeny. 2021;(87):110–117. (In Russ.) https://doi.org/10.52349/0869-7892_2021_87_100-117
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