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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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. / Yakubovich, Olga ; Vikentyev, I. V.; Ivanova, Ekaterina ; Podolskaya, Mary; Sobolev, Ivan; Tyukova, Eugenia; Kotov , Alexander .

In: Geosciences (Switzerland), Vol. 11, No. 10, 408, 27.09.2021, p. 408.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{c2439fb1ffb5427884efcaa767cdd335,

title = "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",

abstract = "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 cm 3·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. ",

keywords = "Alteration, Au-Fe-skarn deposit, Geochronology, Novogodnee-Monto, Polar Urals, Pyrite, Russia, U-Th-He",

author = "Olga Yakubovich and Vikentyev, {I. V.} and Ekaterina Ivanova and Mary Podolskaya and Ivan Sobolev and Eugenia Tyukova and Alexander Kotov",

note = "Publisher Copyright: {\textcopyright} 2021 by the author. Licensee MDPI, Basel, Switzerland.",

year = "2021",

month = sep,

day = "27",

doi = "10.3390/geosciences11100408",

language = "English",

volume = "11",

pages = "408",

journal = "Geosciences (Switzerland)",

issn = "2076-3263",

publisher = "MDPI AG",

number = "10",

}

RIS

TY - JOUR

T1 - 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

AU - Yakubovich, Olga

AU - Vikentyev, I. V.

AU - Ivanova, Ekaterina

AU - Podolskaya, Mary

AU - Sobolev, Ivan

AU - Tyukova, Eugenia

AU - Kotov , Alexander

PY - 2021/9/27

Y1 - 2021/9/27

N2 - 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 cm 3·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.

AB - 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 cm 3·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.

KW - Alteration

KW - Au-Fe-skarn deposit

KW - Geochronology

KW - Novogodnee-Monto

KW - Polar Urals

KW - Pyrite

KW - Russia

KW - U-Th-He

UR - http://www.scopus.com/inward/record.url?scp=85116378405&partnerID=8YFLogxK

U2 - 10.3390/geosciences11100408

DO - 10.3390/geosciences11100408

M3 - Article

VL - 11

SP - 408

JO - Geosciences (Switzerland)

JF - Geosciences (Switzerland)

SN - 2076-3263

IS - 10

M1 - 408

ER -

ID: 86419687