Preprints
https://doi.org/10.5194/gchron-2020-39
https://doi.org/10.5194/gchron-2020-39

  15 Dec 2020

15 Dec 2020

Review status: a revised version of this preprint was accepted for the journal GChron and is expected to appear here in due course.

The closure temperature(s) of zircon Raman dating

Birk Härtel, Raymond Jonckheere, Bastian Wauschkuhn, and Lothar Ratschbacher Birk Härtel et al.
  • Geologie, TU Bergakademie Freiberg, Bernhard-von-Cotta-Straße 2, 09599 Freiberg, Germany

Abstract. We conducted isochronal and isothermal annealing experiments on radiation-damaged zircons between 500 and 1000 °C for durations between ten minutes and five days. We measured the widths (Γ) and positions (ω) of the internal ν1(SiO4), ν2(SiO4), ν3(SiO4), and external rotation Raman bands at ~ 974, 438, 1008, and 356 cm−1. We fitted a Johnson-Mehl-Avrami-Kolmogorov and a distributed activation energy model to the fractional annealing data, calculated from the widths of the ν2(SiO4), ν3(SiO4), and external rotation bands. From the kinetic models, we determined closure temperatures Tc for damage accumulation for each Raman band. Tc range from 330 to 370 °C for the internal ν2(SiO4) and ν3(SiO4) bands; the external rotation band is more sensitive to thermal annealing (Tc ~ 260 to 310 °C). Our estimates are in general agreement with previous ones, but more geological evidence is needed to validate the results. The Tc difference for the different Raman bands offers the prospect of a multi-closure-temperature zircon Raman thermochronometer.

Birk Härtel et al.

 
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Birk Härtel et al.

Data sets

Supplementary material for Härtel, B., Jonkcheere, R., Wauschkuhn, B., Ratschbacher, L.: The closure temperature(s) of zircon Raman dating Birk Härtel https://doi.org/10.25532/OPARA-103

Birk Härtel et al.

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Short summary
We carried out thermal annealing experiments between 500 and 1000 °C to determine the closure temperature of radiation-damage annealing in zircon (ZrSiO4). Our results show that the different Raman bands of zircon respond differently to annealing. The repair is highest for the external rotation Raman band near 356.6 cm−1. The closure temperature estimates range from 250 to 370 °C for different bands. The differences in closure temperatures offer the prospect of multi-T zircon Raman dating.