On the detection of OSL age overestimation using single-aliquot techniques

• Autorzy: Wallinga J.
• Języki publikacji: EN

Abstrakty

EN

Optically stimulated luminescence (OSL) dating is a quantitative dating method to determine the time of last exposure of sand and silt to (sun) light. However, insufficient resetting of the optically stimulated luminescence signal prior to sediment deposition can result in overestimation of the age of a sample. Therefore detection of so-called poor bleaching is of prime importance in OSL dating. Several methods proposed in the literature for detection of poor bleaching are based on the scatter in equivalent doses obtained by singlealiquot methods. In this paper numerical simulations are used to assess the validity of these methods. The simulations show that scatter in equivalent doses is largely dependent on the number of grains contributing to the luminescence signal of each aliquot, and proportion of poorly-bleached grains in the mixture under study. Thresholds for detection of poor bleaching based on inter-aliquot scatter in equivalent doses are therefore not valid. It is concluded that tight, symmetrical dose distributions obtained on small aliquots (ultimately consisting of a single grain) provide the best indication that the sample is homogeneously bleached.

Słowa kluczowe

EN

OSL dating; poor bleaching; single aliquots; equivalent dose

• Wydawca: De Gruyter
• Czasopismo: Geochronometria
• Rocznik: 2002
• Tom: Vol. 21
• Strony: 17--26
• Opis fizyczny: Bibliogr. 43 poz., rys., tab.

Twórcy

autor

Wallinga J.

• Netherlands Centre for Luminescence dating (NCL) IRI Delft University of Technology, Mekelweg 15, NL-2629 JB Delft, Netherlands

Bibliografia

• 1. Aitken M.J., 1998: Introduction to Optical Dating. Oxford University Press: 267pp.
• 2. Bailey S.D., Wintle A.G., Duller G.A.T. and Bristow C.S., 2001: Sand deposition during the last millennium at Aberffraw, Anglesey, North Wales as determined by OSL dating of quartz. Quaternary Science Reviews 20: 701-704.
• 3. Bøtter-Jensen L., Bulur E., Duller G.A.T. and Murray A.S., 2000: Advances in luminescence instrument systems. Radiation Measurements 32: 523-528.
• 4. Clarke M.L., 1996: IRSL dating of sands: bleaching characteristics at deposition inferred from the use of single aliquots. Radiation Measurements 26: 611-620.
• 5. Clarke M.L., Rendell H.M. and Wintle A.G., 1999: Quality assurance in luminescence dating. Geomorphology 29: 173-185.
• 6. Colls A.E., Stokes S., Blum M.D. and Straffin E., 2001: Age limits on the Late Quaternary evolution of the upper Loire River. Quaternary Science Reviews 20: 743-750.
• 7. Duller G.A.T., 1991: Equivalent dose determination using single aliquots. Nuclear Tracks and Radiation Measurements 18: 371-378.
• 8. Duller G.A.T., 1994a: Luminescence dating of poorly bleached sediments from Scotland. Quaternary Science Reviews 13: 521-524.
• 9. Duller G.A.T., 1994b: Luminescence dating using feldspars: a test case from southern North Island, New Zealand. Quaternary Science Reviews 13: 423-427.
• 10. Duller G.A.T., 1995: Luminescence dating using single aliquots: methods and applications. Radiation Measurements 24: 217-226.
• 11. Duller G.A.T., Bøtter-Jensen L. and Murray A.S., 2000: Optical dating of single sand-sized grains of quartz: sources of variability. Radiation Measurements 32: 453-457.
• 12. Duller G.A.T. and Murray A.S., 2000: Luminescence dating of sediments using individual mineral grains. Geologos 5: 86-106.
• 13. Duller G.A.T., Wintle A.G. and Hall A.M., 1995: Luminescence dating and its application to key pre-Late Devensian sites in Scotland. Quaternary Science Reviews 14: 495-519.
• 14. Folz E., Bodu P., Bonte P., Joron J.-L., Mercier N. and Reyss, J.-L., 2001: OSL dating of fluvial quartz from Le Closeau, a Late Paleolithic site near Paris – comparison with 14C chronology. Quaternary Science Reviews 20: 927-934.
• 15. Galbraith R.G., 1990: The radial plot: graphical assessment of spread in ages. Nuclear Tracks and Radiation Measurements 17: 207-214.
• 16. Godfrey-Smith D.I., Huntley D.J. and Chen W.H., 1988: Optical dating studies of quartz and feldspar sediment extracts. Quaternary Science Reviews 7: 373-380.
• 17. Huntley D.J. and Berger G.W., 1995: Scatter in luminescence data for optical dating – some models. Ancient TL 13: 5-9.
• 18. Huntley D.J., Godfrey-Smith D.I. and Thewalt M.L.W., 1985: Optical dating of sediments. Nature 313: 105-107.
• 19. Lamothe M., 1996: Luminescence dating of feldspar in sedimentary environments: The problem of zeroing. Géography physique Quaternaire 50: 365-376.
• 20. Lamothe M. and Auclair M., 1997: Assessing the datability of young sediments by IRSL using an intrinsic laboratory protocol. Radiation Measurements 27: 107-117.
• 21. Lamothe M., Balescu S. and Auclair M., 1994: Natural IRSL intensities and apparent luminescence ages of single feldspar grains extracted from partially bleached sediments. Radiation Measurements 23: 555-561.
• 22. Lepper N., Agersnap Larsen N. and McKeever S.W.S., 2000: Equivalent dose distribution analysis of Holocene eolian and fluvial quartz sands from Central Oklahoma. Radiation Measurements 32: 603-608.
• 23. Li S.-H., 1994: Optical dating: insufficiently bleached sediments. Radiation Measurements 23: 563-567.
• 24. McFee C.J., 1998: The measurement of single grain IRSL EDs using an imaging photon detector. Quaternary Science Reviews 17: 1001-1008.
• 25. McFee C.J. and Tite M.S., 1998: Luminescence dating of sediments – the detection of high equivalent dose grains using an imaging photon detector. Archaeometry 40: 153-168.
• 26. Murray A.S., Olley J.M. and Caitcheon G.G., 1995: Measurement of equivalent doses in quartz from contemporary water-lain sediments using optically stimulated luminescence. Quaternary Science Reviews 14: 365-371.
• 27. Murray A.S. and Roberts R.G., 1997: Determining the burial time of single grains of quartz using optically stimulated luminescence. Earth and Planetary Science Letters 152: 163-180.
• 28. Olley J.M., Caitcheon G.G. and Murray A.S., 1998: The distribution of apparent dose as determined by optically stimulated luminescence in small aliquots of fluvial quartz: implications for dating young sediments. Quaternary Science Reviews, 17: 1033-1040.
• 29. Olley J.M., Caitcheon G.G. and Roberts R.G., 1999: The origin of dose distributions in fluvial sediments, and the prospect of dating single grains from fluvial deposits using optically stimulated luminescence. Radiation Measurements 30: 207-217.
• 30. Olley J.M., Roberts R.G. and Murray A.S., 1997: Disequilibria in the uranium decay series in sedimentary deposits at Allen’s Cave, Nullarbor Plain, Australia: implications for dose rate determinations. Radiation Measurements 27: 433-443.
• 31. Porat N., Zilberman E., Amit R. and Enzel Y., 2001: Residual ages of modern sediments in an hyperarid region, Israel. Quaternary Science Reviews 20: 7795-798.
• 32. Rhodes E.J., 1990: Optical dating of quartz from sediments. Unpublished D.Phil thesis, University of Oxford.
• 33. Rhodes E.J. and Pownall L., 1994: Zeroing of the OSL signal in quartz from young glaciofluvial sediments. Radiation Measurements 23: 581-585.
• 34. Roberts R.G., 1997: Luminescence dating in archaeology: from origins to optical. Radiation Measurements 27: 819-892.
• 35. Roberts R., Bird M., Olley J., Galbraith R., Lawson E., Laslett G., Yoshida H., Jones R., Fullagar R., Jacobsen G. and Hua Q., 1998: Optical and radiocarbon dating at Jinmium rock shelter in northern Australia. Nature 393: 358-362.
• 36. Roberts R.G., Galbraith R.F., Yoshida H., Laslett G.M. and Olley J.M., 2000: Distinguishing dose populations in sediment mixtures: a test of single-grain optical dating procedures using mixtures of laboratory-dosed quartz. Radiation Measurements 32, 459-465.
• 37. Spooner N.A., 1994: The anomalous fading of infrared-stimulated luminescence from feldspars. Radiation Measurements 23: 625-632.
• 38. Stokes S., 1992: Optical dating of young (modern) sediments using quartz: results from a selection of depositional environments. Quaternary Science Reviews 11: 153-159.
• 39. Stokes S., 1999: Luminescence dating applications in geomorphological research. Geomorphology 29: 153-171.
• 40. Stokes S., Bray H.E. and Blum M.D., 2001: Optical resetting in large drainage basins: Tests of zeroing assumptions using singlealiquot procedures. Quaternary Science Reviews 20: 879-886.
• 41. Wallinga J., Murray A.S. and Duller G.A.T., 2000: Underestimation of equivalent dose in single-aliquot optical dating of feldspars caused by preheating. Radiation Measurements 32: 691-695.
• 42. Wintle A.G., 1973: Anomalous fading of thermoluminescence in mineral samples. Nature 245: 143-144.
• 43. Wintle A.G., Li S.H., Botha G.A. and Vogel J.C., 1995: Evaluation of luminescence-dating procedures applied to late-Holocene colluvium near St Paul’s Mission, Natal, South Africa. The Holocene 5: 97-102.