U-Th-He Geochronology of Pyrite from the Uzelga VMS Deposit (South Urals)—New Perspectives for Direct Dating of the Ore-Forming Processes
We report on the application of the U-Th-He method for the direct dating of pyrite and provide an original methodological approach for measurement of U, Th and He in single grains without loss of parent nuclides during thermal extraction of He. The U-Th-He age of ten samples of high-crystalline stoi...
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MDPI AG
2020-07-01
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| author | Olga Yakubovich Mary Podolskaya Ilya Vikentyev Elena Fokina Alexander Kotov |
| author_facet | Olga Yakubovich Mary Podolskaya Ilya Vikentyev Elena Fokina Alexander Kotov |
| author_sort | Olga Yakubovich |
| collection | DOAJ |
| description | We report on the application of the U-Th-He method for the direct dating of pyrite and provide an original methodological approach for measurement of U, Th and He in single grains without loss of parent nuclides during thermal extraction of He. The U-Th-He age of ten samples of high-crystalline stoichiometric pyrite from unoxidized massive ores of the Uzelga volcanogenic massive sulfide (VMS) deposit, South Urals, is 382 ± 12 Ma (2σ) (U concentrations ~1–5 ppm; <sup>4</sup>He ~10<sup>−4</sup> cm<sup>3</sup> STP g<sup>−1</sup>). This age is consistent with independent (biostratigraphic) estimations of the age of ore formation (ca, 389–380 Ma) and is remarkably older than the probable age of the regional prehnite-pumpellyite facies metamorphism (~340–345 Ma). Our results indicate that the U-Th-He dating of ~1 mg weight pyrite sample is possible and open new perspectives for the dating of ore deposits. The relative simplicity of U-Th-He dating in comparison with other geochronological methods makes this approach interesting for further application. |
| first_indexed | 2024-03-10T18:27:08Z |
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| id | doaj.art-da3d7b1924604559acb39b53f3609648 |
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| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T18:27:08Z |
| publishDate | 2020-07-01 |
| publisher | MDPI AG |
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| series | Minerals |
| spelling | doaj.art-da3d7b1924604559acb39b53f36096482023-11-20T06:57:43ZengMDPI AGMinerals2075-163X2020-07-0110762910.3390/min10070629U-Th-He Geochronology of Pyrite from the Uzelga VMS Deposit (South Urals)—New Perspectives for Direct Dating of the Ore-Forming ProcessesOlga Yakubovich0Mary Podolskaya1Ilya Vikentyev2Elena Fokina3Alexander Kotov4Institute of Earth Sciences, Saint-Petersburg University, Universitetskaya emb., 7/9, 199034 Saint-Petersburg, RussiaVernadsky institute of geochemistry and analytical chemistry (GEOKHI) Russian Academy of Sciences, Kosygina str. 19, 119991 Moscow, RussiaInstitute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry (IGEM), Russian Academy of Sciences, Staromonetny per. 35, 119017 Moscow, RussiaInstitute of Earth Sciences, Saint-Petersburg University, Universitetskaya emb., 7/9, 199034 Saint-Petersburg, RussiaInstitute of Precambrian Geology and Geochronology (IPGG) Russian Academy of Sciences, Makarova emb. 2, 199034 Saint-Petersburg, RussiaWe report on the application of the U-Th-He method for the direct dating of pyrite and provide an original methodological approach for measurement of U, Th and He in single grains without loss of parent nuclides during thermal extraction of He. The U-Th-He age of ten samples of high-crystalline stoichiometric pyrite from unoxidized massive ores of the Uzelga volcanogenic massive sulfide (VMS) deposit, South Urals, is 382 ± 12 Ma (2σ) (U concentrations ~1–5 ppm; <sup>4</sup>He ~10<sup>−4</sup> cm<sup>3</sup> STP g<sup>−1</sup>). This age is consistent with independent (biostratigraphic) estimations of the age of ore formation (ca, 389–380 Ma) and is remarkably older than the probable age of the regional prehnite-pumpellyite facies metamorphism (~340–345 Ma). Our results indicate that the U-Th-He dating of ~1 mg weight pyrite sample is possible and open new perspectives for the dating of ore deposits. The relative simplicity of U-Th-He dating in comparison with other geochronological methods makes this approach interesting for further application.https://www.mdpi.com/2075-163X/10/7/629geochronologyhelium datingpyriteUzelgaVMS deposits |
| spellingShingle | Olga Yakubovich Mary Podolskaya Ilya Vikentyev Elena Fokina Alexander Kotov U-Th-He Geochronology of Pyrite from the Uzelga VMS Deposit (South Urals)—New Perspectives for Direct Dating of the Ore-Forming Processes Minerals geochronology helium dating pyrite Uzelga VMS deposits |
| title | U-Th-He Geochronology of Pyrite from the Uzelga VMS Deposit (South Urals)—New Perspectives for Direct Dating of the Ore-Forming Processes |
| title_full | U-Th-He Geochronology of Pyrite from the Uzelga VMS Deposit (South Urals)—New Perspectives for Direct Dating of the Ore-Forming Processes |
| title_fullStr | U-Th-He Geochronology of Pyrite from the Uzelga VMS Deposit (South Urals)—New Perspectives for Direct Dating of the Ore-Forming Processes |
| title_full_unstemmed | U-Th-He Geochronology of Pyrite from the Uzelga VMS Deposit (South Urals)—New Perspectives for Direct Dating of the Ore-Forming Processes |
| title_short | U-Th-He Geochronology of Pyrite from the Uzelga VMS Deposit (South Urals)—New Perspectives for Direct Dating of the Ore-Forming Processes |
| title_sort | u th he geochronology of pyrite from the uzelga vms deposit south urals new perspectives for direct dating of the ore forming processes |
| topic | geochronology helium dating pyrite Uzelga VMS deposits |
| url | https://www.mdpi.com/2075-163X/10/7/629 |
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