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Annealing of ion tracks in apatite under pressure characterized in situ by small angle x-ray scattering

Journal Article · · Scientific Reports
 [1];  [2];  [2];  [3];  [4];  [5];  [6];  [2]
  1. Australian National Univ., Canberra, ACT (Australia); George Washington University
  2. Australian National Univ., Canberra, ACT (Australia)
  3. GSI Helmholtz Centre for Heavy Ion Research, Darmstadt (Germany); Technische Univ. Darmstadt (Germany)
  4. Univ. of Tennessee, Knoxville, TN (United States)
  5. Stanford Univ., CA (United States)
  6. Australian Synchrotron, VIC (Australia)
+ Show Author Affiliations
Fission track thermochronology is routinely used to investigate the thermal history of sedimentary basins, as well as tectonic uplift and denudation rates. While the effect of temperature on fission track annealing has been studied extensively to calibrate the application of the technique, the effect of pressure during annealing is generally considered to be negligible. However, a previous study suggested elevated pressure results in a significantly different annealing behaviour that was previously unknown. Here, we present a method to study track annealing in situ under high pressure by using synchrotron- based small angle x-ray scattering (SAXS). To simulate fission tracks in a controlled environment, ion tracks were created in apatite from Durango, Mexico using 2 GeV Au or Bi ions provided by an ion accelerator facility. Samples were annealed at 250°C at approximately 1 GPa pressure using diamond anvil cells (DAcs) with heating capabilities. Additional in situ annealing experiments at ambient pressure and temperatures between 320 and 390°C were performed for comparison. At elevated pressure a significantly accelerated annealing rate of the tracks was observed compared with annealing at ambient pressure. However, when extrapolated to geologically relevant temperatures and pressures, the effects become very small. The measurement methodology presented provides a new avenue to study materials behaviour in extreme environments.
Research Organization:
George Washington Univ., Washington, DC (United States). Capital/DOE Alliance Center
Sponsoring Organization:
Australian Research Council (ARC); USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
Grant/Contract Number:
NA0003858
OSTI ID:
1596795
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 10; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

58 GEOSCIENCES
Characterization and analytical techniques
Geophysics