U–Th–He Dating of Pyrite from the Uzelga Copper-Zinc Massive Sulfide Deposit (South Urals, Russia): First Application of a New Geochronometer

Yakubovich, O. V.; Vikentyev, I. V.; Зарубина, О. В.; Bryanskiy, N. V.; Gorokhovskii, B. M.; Kotov, A. B.; Dril, S. I.; Бортников, Н. С.

doi:10.1134/s1028334x19040263

Cited by 3 publications

(6 citation statements)

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“…High retention of He in sperrylite suggests that pyrite, which has the same crystallographic structure, might also be a convenient mineral for geochronology. Recent experiments on helium thermodesorption from sulfides had confirmed this suggestion [11] and preliminary results of the U-Th-He dating of pyrite from the Uzelga deposit are promising [12].…”

Section: Introductionmentioning

confidence: 88%

“…The calculated central age for five grains of Durango apatite is 32.2 ± 1.9 (2σ) Ma (MSWD 1.57), which is in good agreement with published data of 32.3 ± 0.9 Ma [107] (Table 1). In total, we dated 14 fragments of pyrite with weights ranging from 0.5 to 1.5 mg (including nine earlier values [12]). Two pyrite grains were wrapped in Ta foil and others were sealed in the quartz ampoule (Table 1).…”

Section: Calculation Of U-th-he Agementioning

confidence: 99%

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U-Th-He Geochronology of Pyrite from the Uzelga VMS Deposit (South Urals)—New Perspectives for Direct Dating of the Ore-Forming Processes

et al. 2020

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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; 4He ~10−4 cm3 STP g−1). 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.

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Section: Introductionmentioning

confidence: 88%

Section: Calculation Of U-th-he Agementioning

confidence: 99%

U-Th-He Geochronology of Pyrite from the Uzelga VMS Deposit (South Urals)—New Perspectives for Direct Dating of the Ore-Forming Processes

et al. 2020

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“…The 8, 7 and 6 coefficients are the amounts of 4 He atoms produced by the decay of corresponding parental nuclide. The detailed isotope-geochemical constraints regarding the possibility of U-Th-He dating of pyrite are described elsewhere [2,8,9]. Here, we briefly summarize the major prerequisites.…”

Section: Isotope-geochemical Backgroundmentioning

confidence: 99%

“…In the past decade, a large body of work has been focused on understanding the behavior of radiogenic helium in various minerals that has not been traditionally studied for geochronology, such as hematite, magnetite, calcite, native metals, arsenides and sulfides ( [1][2][3][4][5][6][7] and references within). Some of these minerals have shown a high retentivity of helium, which may facilitate their use as He-geochronometers [1,3,8], including pyrite. The first application of dating pyrite using the U-Th-He method from the Uzelga VMS-type deposit was successful [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…Some of these minerals have shown a high retentivity of helium, which may facilitate their use as He-geochronometers [1,3,8], including pyrite. The first application of dating pyrite using the U-Th-He method from the Uzelga VMS-type deposit was successful [8,9]. This success opened up a new perspective for dating ore-forming, sedimentary and tectonic processes, as pyrite is often formed during these processes.…”

Section: Introductionmentioning

confidence: 99%

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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

et al. 2021

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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.

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(U-Th)/He chronology: Part 1. Data, uncertainty, and reporting

et al. 2022

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The field of (U-Th)/He geochronology and thermochronology has grown enormously over the past ∼25 years. The tool is applicable across much of geologic time, new (U-Th)/He chronometers are under continuous development, and the method is used in a diverse array of studies. Consequently, the technique has a rapidly expanding user base, and new labs are being established worldwide. This presents both opportunities and challenges. Currently there are no universally agreed-upon protocols for reporting measured (U-Th)/He data or data derivatives. Nor are there standardized practices for reporting He diffusion kinetic, 4He/3He, or continuous ramped heating data. Approaches for reporting uncertainties associated with all types of data also vary widely. Here, we address these issues. We review the fundamentals of the methods, the types of materials that can be dated, how data are acquired, the process and choices associated with data reduction, and make recommendations for data and uncertainty reporting. We advocate that both the primary measured and derived data be reported, along with statements of assumptions, appropriate references, and clear descriptions of the methods used to compute derived data from measured values. The adoption of more comprehensive and uniform approaches to data and uncertainty reporting will enable data to be re-reduced in the future with different interpretative contexts and data reduction methods, and will facilitate inter-comparison of data sets generated by different laboratories. Together, this will enhance the value, cross-disciplinary use, reliability, and ongoing development of (U-Th)/He chronology.

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U–Th–He Dating of Pyrite from the Uzelga Copper-Zinc Massive Sulfide Deposit (South Urals, Russia): First Application of a New Geochronometer

Cited by 3 publications

References 13 publications

U-Th-He Geochronology of Pyrite from the Uzelga VMS Deposit (South Urals)—New Perspectives for Direct Dating of the Ore-Forming Processes

U-Th-He Geochronology of Pyrite from the Uzelga VMS Deposit (South Urals)—New Perspectives for Direct Dating of the Ore-Forming Processes

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

(U-Th)/He chronology: Part 1. Data, uncertainty, and reporting

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