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Article

U-Th-He Geochronology of Pyrite from Alteration of the Au-Fe-Skarn Novogodnee-Monto Deposit (Polar Urals, Russia)—The Next Step in the Development of a New Approach for Direct Dating of Ore-Forming Processes

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Institute of Earth Sciences, Saint-Petersburg University, 199034 Saint-Petersburg, Russia
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Institute of Precambrian Geology and Geochronology (IPGG), Russian Academy of Sciences, 199034 Saint-Petersburg, Russia
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Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry (IGEM), Russian Academy of Sciences, 119017 Moscow, Russia
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Engineering Academy, Peoples’ Friendship University of Russia (RUDN University), 117198 Moscow, Russia
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Vernadsky Institute of Geochemistry and Analytical Chemistry (GEOKHI), Russian Academy of Sciences, 119991 Moscow, Russia
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Scientific Geoinformation Centre, Russian Academy of Sciences, 119019 Moscow, Russia
*
Author to whom correspondence should be addressed.
Academic Editors: Giacomo Oggiano and Jesus Martinez-Frias
Geosciences 2021, 11(10), 408; https://doi.org/10.3390/geosciences11100408
Received: 9 August 2021 / Revised: 13 September 2021 / Accepted: 20 September 2021 / Published: 27 September 2021
(This article belongs to the Collection Geological Features on Magmatic–Hydrothermal Mineralization)
We report on the application of the U-Th-He method for the direct dating of pyrite from the alteration halo of the Novogodnee-Monto Au-Fe-skarn deposit, Polar Urals. The deposit is genetically related to the formation of volcanogenic complexes of the Ural Paleozoic belt. A modification of the original methodology for measuring U, Th and He isotopes in a single grain allowed us to determine a U-Th-He age of 382 ± 8 Ma (2σ) based on six pyrite samples from the altered rocks of the deposit (U mass fraction ~0.2 mg/kg; Th/U ~3.5; 4He specific volume ~10−5 cm3·STP·g−1). This age is consistent with estimates of the age of ore formation and coeval with the end of the period of island arc magmatic activity. Our results indicate that U-Th-He dating for pyrite samples of ~1 mg in weight from the hydrothermal-metasomatic halo of ore bodies is possible, providing a crucial next step in the development of U-Th-He pyrite geochronology. View Full-Text
Keywords: geochronology; U-Th-He; pyrite; Novogodnee-Monto; Polar Urals; alteration; Au-Fe-skarn deposit; Russia geochronology; U-Th-He; pyrite; Novogodnee-Monto; Polar Urals; alteration; Au-Fe-skarn deposit; Russia
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MDPI and ACS Style

Yakubovich, O.; Vikentyev, I.; Ivanova, E.; Podolskaya, M.; Sobolev, I.; Tyukova, E.; Kotov, A. U-Th-He Geochronology of Pyrite from Alteration of the Au-Fe-Skarn Novogodnee-Monto Deposit (Polar Urals, Russia)—The Next Step in the Development of a New Approach for Direct Dating of Ore-Forming Processes. Geosciences 2021, 11, 408. https://doi.org/10.3390/geosciences11100408

AMA Style

Yakubovich O, Vikentyev I, Ivanova E, Podolskaya M, Sobolev I, Tyukova E, Kotov A. U-Th-He Geochronology of Pyrite from Alteration of the Au-Fe-Skarn Novogodnee-Monto Deposit (Polar Urals, Russia)—The Next Step in the Development of a New Approach for Direct Dating of Ore-Forming Processes. Geosciences. 2021; 11(10):408. https://doi.org/10.3390/geosciences11100408

Chicago/Turabian Style

Yakubovich, Olga, Ilya Vikentyev, Ekaterina Ivanova, Mary Podolskaya, Ivan Sobolev, Eugenia Tyukova, and Alexander Kotov. 2021. "U-Th-He Geochronology of Pyrite from Alteration of the Au-Fe-Skarn Novogodnee-Monto Deposit (Polar Urals, Russia)—The Next Step in the Development of a New Approach for Direct Dating of Ore-Forming Processes" Geosciences 11, no. 10: 408. https://doi.org/10.3390/geosciences11100408

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