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Geothermochronology based on noble gases: II. Stability of the (U-Th)/He isotope system in zircon

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Abstract

The kinetics of He migration from zircon of variable degree of metamictization was investigated. The migration parameters of He were experimentally determined, the influence of radiation damage and the degree of metamictization on the stability of the (U-Th)/He isotope system was evaluated, the mechanisms of noble gas escape from zircon were investigated, new data on the kinetics of He migration were obtained and compared with previous results for the kinetics of Xe migration from zircon of the same geologic objects. It was shown that He occurs in two energy positions in the zircon lattice: the main position (more than 80% He) with an activation energy of ∼39 kcal/mol and k 0 = 1011 yr−1 and the second position with an activation energy for migration of 5–10 kcal/mol and k 0 ∼ 106 yr−1. It was concluded that He migration from the main energy position is better described by a single-jump mechanism. The migration of He from the second energy position is consistent with the diffusion mechanism. It was shown that deviations from the linear dependence in the lnln(He0/Het)-1/T coordinates are probably related to the destruction of volume defects containing He atoms at high temperatures (more than 1000°C on the experimental time scale) resulting in a change from the single-jump to diffusion mechanism and the presence of atoms migrating via the diffusion mechanism. It was shown that the peak width in the spectrum of radiogenic He release and the appearance of a second peak also depend on the fraction of atoms migrating in accordance with the diffusion mechanism. It was found that the low activation energy for He release from the second energy position indicates the existence of continuous He loss from the zircon lattice.

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Correspondence to Yu. A. Shukolyukov.

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Original Russian Text © O.V. Yakubovich, Yu.A. Shukolyukov, A.B. Kotov, S.Z. Yakovleva, E.B. Sal’nikova, 2010, published in Petrologiya, 2010, Vol. 18, No. 6, pp. 579–594.

This contribution is part of a series that began from the paper of Yu. A. Shukolyukov, M. M. Fugzan, I. P. Paderin, S. A. Sergeev, and D. P. Krylov, “Geothermochronology Based on Noble Gases: I. Stability of the U-Xe Isotope System in Nonmetamict Zircon,” Petrologiya, 17 (1), 3–27 (2009). [Petrology, 17, 1–24 (2009)].

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Yakubovich, O.V., Shukolyukov, Y.A., Kotov, A.B. et al. Geothermochronology based on noble gases: II. Stability of the (U-Th)/He isotope system in zircon. Petrology 18, 555–570 (2010). https://doi.org/10.1134/S0869591110060019

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