TY - CHAP

T1 - Dating pyrite by radiogenic helium: new approach to determine the age of hydrothermal processes

AU - Yakubovich, Olga V.

AU - Vikentyev, Ilya V.

AU - Bryanskiy, N. V.

AU - Zarubina, O. V.

AU - Gorokhovskii, B. M.

PY - 2019

Y1 - 2019

N2 - In this study, the possibility of U-Th-He dating of pyrite is explained and then substantiated by isotope geochemistry. The first U-Th-He age obtained for 9 pyrite samples from the VMS type Uzelga deposit, Urals (377±8 Ma; MSWD 1.2) is in good agreement with independent biostratigraphic age estimations (380-390 Ma). This leads to the conclusion that pyrite can be used as a U-Th-He mineral geochronometer. Based on the results of step-heating experiments and U-Th-He age estimations it is shown that chalcopyrite, bornite and pyrrhotite are unlikely to be used in geochronology. The relative ease of U-Th-He dating in comparison with other geochronological methods makes this approach interesting for further application.

AB - In this study, the possibility of U-Th-He dating of pyrite is explained and then substantiated by isotope geochemistry. The first U-Th-He age obtained for 9 pyrite samples from the VMS type Uzelga deposit, Urals (377±8 Ma; MSWD 1.2) is in good agreement with independent biostratigraphic age estimations (380-390 Ma). This leads to the conclusion that pyrite can be used as a U-Th-He mineral geochronometer. Based on the results of step-heating experiments and U-Th-He age estimations it is shown that chalcopyrite, bornite and pyrrhotite are unlikely to be used in geochronology. The relative ease of U-Th-He dating in comparison with other geochronological methods makes this approach interesting for further application.

UR - https://www.sga2019glasgow.com/abstract

M3 - Article in an anthology

VL - 1

SP - 194

EP - 197

BT - Life with Ore Deposits on Earth – 15th SGA Biennial Meeting 2019

CY - Glasgow

T2 - Life with Ore Deposits on Earth

Y2 - 27 August 2019 through 30 August 2019

ER -