Developments in optically stimulated luminescence and photo-transferred thermoluminescence dating of young sediments: Application to a 2000-year sequence of flood deposits

Developments in optically stimulated luminescence and photo-transferred thermoluminescence dating... This paper demonstrates how optically stimulated luminescence (OSL) and photo-transferred thermoluminescence (PTTL) can be used to date young (0–2000 year-old) flood deposits on the bank of a major river in the Southern Tablelands of southeastern Australia. Quartz grains extracted from these deposits do not show a detectable dose-dependent sensitivity change following optical stimulation. This allows a recently proposed regeneration-based protocol (SARA) to be used to estimate the equivalent dose ( D e ) acquired since burial. For the oldest sample, a dependence of D e on pre-heat temperature is removed by heating to at least 180 °C for 10 s before stimulation. Values of D e are reported for six samples using both OSL and PTTL. Values ranged between 0.4 and 6.5 Gy, with overall uncertainties usually <7%; the values of D e obtained using OSL and PTTL are in agreement. Dose rates are calculated from detailed analyses of environmental radionuclide concentrations, and the resulting luminescence dates range from 100 ± 13 to 1920 ± 130 years before present; the uncertainties include systematic effects. For two layers where there is age control by 14 C dates, the luminescence dates are in good agreement. Unfortunately, the limitations of the 14 C data preclude firm conclusions about the size of any effective age-residual at deposition for the luminescence samples, although this is likely to be <50–100 years. It is concluded that luminescence dating offers a considerable improvement over other techniques, including 14 C, for recently transported fluvial sediments. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geochimica et Cosmochimica Acta Elsevier

Developments in optically stimulated luminescence and photo-transferred thermoluminescence dating of young sediments: Application to a 2000-year sequence of flood deposits

Geochimica et Cosmochimica Acta, Volume 60 (4) – Feb 1, 1996

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Publisher
Elsevier
Copyright
Copyright © 1996 Elsevier Science Ltd
ISSN
0016-7037
eISSN
1872-9533
D.O.I.
10.1016/0016-7037(95)00418-1
Publisher site
See Article on Publisher Site

Abstract

This paper demonstrates how optically stimulated luminescence (OSL) and photo-transferred thermoluminescence (PTTL) can be used to date young (0–2000 year-old) flood deposits on the bank of a major river in the Southern Tablelands of southeastern Australia. Quartz grains extracted from these deposits do not show a detectable dose-dependent sensitivity change following optical stimulation. This allows a recently proposed regeneration-based protocol (SARA) to be used to estimate the equivalent dose ( D e ) acquired since burial. For the oldest sample, a dependence of D e on pre-heat temperature is removed by heating to at least 180 °C for 10 s before stimulation. Values of D e are reported for six samples using both OSL and PTTL. Values ranged between 0.4 and 6.5 Gy, with overall uncertainties usually <7%; the values of D e obtained using OSL and PTTL are in agreement. Dose rates are calculated from detailed analyses of environmental radionuclide concentrations, and the resulting luminescence dates range from 100 ± 13 to 1920 ± 130 years before present; the uncertainties include systematic effects. For two layers where there is age control by 14 C dates, the luminescence dates are in good agreement. Unfortunately, the limitations of the 14 C data preclude firm conclusions about the size of any effective age-residual at deposition for the luminescence samples, although this is likely to be <50–100 years. It is concluded that luminescence dating offers a considerable improvement over other techniques, including 14 C, for recently transported fluvial sediments.

Journal

Geochimica et Cosmochimica ActaElsevier

Published: Feb 1, 1996

References

  • Optical dating of sediments
    Huntley, D.J.; Godfrey-Smith, D.I.; Thewalt, M.L.W.
  • Thermoluminescence dating: beta-dose attenuation in quartz grains
    Mejdahl, V.
  • Incomplete stimulation of luminescence in young quartz sediments and its effect on the regenerated signal
    Murray, A.S.
  • Measurement of equivalent doses from contemporary water-lain sediments using optically stimulated luminescence
    Murray, A.S.; Olley, J.M.; Caitcheon, G.G.
  • The effects of disequilibria in the uranium and thorium decay chains on burial dose rates in fluvial sediments
    Olley, J.M.; Murray, A.S.; Roberts, R.G.

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