Investigating the resetting of OSL signals in rock surfaces

• Autorzy: Sohbati R. , Murray A. S. , Jain M. , Buylaert J.-P. , Thomsen K. J.
• Języki publikacji: EN

Abstrakty

EN

There are many examples of buried rock surfaces whose age is of interest to geologists and archaeologists. Luminescence dating is a potential method which can be applied to dating such surfaces; as part of a research project which aims to develop such an approach, the degree of resetting of OSL signals in grains and slices from five different cobbles/boulders collected from a modern beach is investigated. All the rock surfaces are presumed to have been exposed to daylight for a prolonged period of time (weeks to years). Feldspar was identified as the preferred dosimeter because quartz extracts were insensitive. Dose recovery tests using solar simulator and IR diodes on both K-feldspar grains and solid slices taken from the inner parts of the rocks are discussed. Preheat plateau results using surface grains and slices show that significant thermal transfer in naturally bleached samples can be avoided by keeping preheat temperatures low. Equivalent doses from surface K-feldspar grains were highly scattered and much larger than expected (0.02 Gy to >100 Gy), while solid surface slices gave more reproducible small doses (mean = 0.17š0.02 Gy, n = 32). Neither crushing nor partial bleaching were found to be responsible for the large scattered doses from grains, nor did the inevitable contribution from Na-feldspar to the signal from solid slices explain the improved reproducibility in the slices. By modelling the increase of luminescence signal with distance into the rock surface, attenuation factors were derived for two samples. These indicate that, for instance, bleaching at a depth of 2 mm into these samples occurs at about ~28% of the rate at the surface. We conclude that it should be possible to derive meaningful burial doses of >1 Gy from such cobbles; younger samples would probably require a correction for incomplete bleaching.

Słowa kluczowe

EN

bleaching; luminescence; rock surfaces; feldspar; OSL; IRSL

• Wydawca: De Gruyter
• Czasopismo: Geochronometria
• Rocznik: 2011
• Tom: Vol. 38, no. 3
• Strony: 249--258
• Opis fizyczny: Bibliogr. 32 poz., rys., wykr.

Twórcy

autor

Sohbati R.

autor

Murray A. S.

autor

Jain M.

autor

Buylaert J.-P.

autor

Thomsen K. J.

• Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, Aarhus University, Risø DTU, DK-4000 Roskilde, Denmark,

Bibliografia

• Aitken MJ, 1985. Thermoluminescnce dating. Academic Press. London.
• Blair MW, Yukihara EG, McKeever SWS, 2005. Experiences with single-aliquot OSL procedures using coarse-grain feldspar. Radiation Measurements 39(4): 361-374, DOI 10.1016/j.radmeas.2004.05.008.
• Buylaert JP, Vandeberghe D, Murray AS, Huot S, De Corte F, Van den haute P, 2007. Luminescence dating of old (>70 ka) Chinese loess: A comparison of single-aliquot OSL and IRSL techniques. Quaternary Geochronology 2(1-4): 9-14, DOI 10.1016/j.quageo.2006.05.028.
• Buylaert JP, Murray AS, Thomsen KJ, Jain M, 2009. Testing the potential of an elevated IRSL signal from K-feldspar. Radiation Measurements 44 (5-6): 560-565, DOI 10.1016/j.radmeas.2009.02.007.
• Bøtter-Jensen L, Andersen CE, Duller GAT, Murray AS, 2003. Developments in radiation, stimulation and observation facilities in luminescence measurements. Radiation Measurements 37(4-5): 535-541, DOI 10.1016/S1350-4487(03)00020-9.
• Jain M, Lindvold LR, 2007. Blue light stimulation and linearly modulated optically stimulated luminescence. Ancient TL 25 (2): 69-80.
• Greilich S, Glasmacher UA, Wagner GA, 2005. Optical dating of granitic stone surfaces. Archaeometry 47 (3): 645-665, DOI 10.1111/j.1475 4754.2005.00224.x.
• Habermann J, Schilles T, Kalchgruber R, Wagner GA, 2000. Steps towards surface dating using luminescence. Radiation Measurements 32(5-6): 847-851, DOI 10.1016/S1350-4487(00)00066-4.
• Hunley DJ, Lamothe M, 2001. Ubiquity of anomalous fading in K-feldspars and the measurement and correction for it in optical dating. Canadian Journal of Earth Sciences 38: 1093-1106. DOI 10.1139/cjes-38-7-1093.
• Klasen N, Fiebig M, Preusser F, Radtke U, 2006. Luminescence proper-ties of glaciofluvial sediments from the Bavarian Alpine Foreland. Radiation Measurements 41(7-8): 886-870, DOI 10.1016/j.radmeas.2006.05.016.
• Liritzis I, 1994. A new dating method by thermoluminescence of carved megalithic stone building. Comptes Rendus de l’Académie des Sciences-Série II 319: 603-610.
• Liritzis I, Guibert P, Foti F, Schvoerer M, 1997. The temple of Apollo (Delphi) strengthens novel thermoluminescence dating method. Geoarchaeology 12(5): 479-496, DOI 10.1002/(SICI)1520-6548(199708)12:5<479::AID-GEA3>3.0.CO;2-X.
• Liritzis I and Galloway RB, 1999. Dating implications from solar bleaching of thermoluminescence of ancient marble. Journal of Radioanalytic and Nuclear Chemistry 241(2): 361-368, DOI 10.1007/BF02347476.
• Liritzis I, Sideris C, Vafiadou A, Mitsis J, 2007. Mineralogical, petrological and radioactivity aspects of some building material from Egyption Old Kingdom monuments. Journal of Cultural Heritage 9(1): 1-13, DOI 10.1016/j.culher.2007.03.009.
• Liritzis I, Kitis G, Galloway RB, Vafiadou A, Tsirliganis NC, Polymeris G, 2008. Probing luminescence dating of archaeologically significant carved rock types. Mediterranean Archaeology and Archaeometry 8 (1): 61-79.
• Madsen AT and Murray AS, 2009. Optically stimulated dating of young sediments: A review. Geomorphology 109(1-2): 3-16, DOI 10.1016/j.geomorph.2008.08.020.
• Mejdahl V, 1979. Thermoluminescence dating: beta-dose attenuation in quartz grains. Archaeometry 21(1): 61-72, DOI 10.1111/j.1475-4754.1979.tb00241.x.
• Morgenstein ME, Luo S, Ku TL, Feathers J, 2003. Uranium-series and luminescence dating of volcanic lithic artefacts. Archaeometry 45(3): 503-518, DOI 10.1111/1475-4754.00124.
• Moska P, Murray AS, 2006. Stability of the quartz fast-component in insensitive samples. Radiation Measurements 41(7-8): 878-885, DOI 10.1016/j.radmeas.2006.06.005.
• Murray AS, Marten R, Johnston A, Martin P, 1987. Analysis for naturally occurring radionuclides at environmental concentrations by gamma spectrometry. Journal of Radioanalytical and Nuclear Chemistry 115(2): 263-288, DOI 10.1007/BF02037443.
• Murray AS, Wintle AG, 2000. Luminescence dating of quartz using an improved single-aliquot regenerative-dose protocol. Radiation Measurements 32(1): 57-73, DOI 10.1016/S1350-4487(99)00253-X.
• NASA, 2010. NASA surface metrology and solar energy. http://eosweb.larc.nasa.gov/cgi-bin/sse/grid.cgi.
• Polikreti K, Michael CT, Maniatis Y, 2002. Authenticating marble sculpture with thermoluminescence. Ancient TL 20(1): 11-18.
• Polikreti K, Michael CT, Maniatis Y, 2003. Thermoluminescence characteristics of marble and dating of freshly excavated marble objects. Radiation Measurements 37(1): 87-94, DOI 10.1016/S1350-4487(02)00088-4.
• Spooner NA, 1994. The anomalous fading of infrared-stimulated luminescence from feldspars. Radiation Measurements 23(2-3): 625-632, DOI 10.1016/1350-4487(94)90111-2.
• Şen Z, 2008. Solar energy fundamentals and modelling techniques. Springer. London.
• Theocaris PS, Liritzis I, Galloway RB, 1997. Dating of two Hellinic Pyramids by a novel application of thermoluminescence. Journal of Archaeological Science 24(5): 399-405, DOI 10.1006/jasc.1996.0124.
• Thomsen KJ, Murray AS, Jain M, Bøtter-Jensen L, 2008. Laboratory fading rates of various luminescence signals from feldspar-rich sediment extracts. Radiation Measurements 43(9-10): 1474-1486, DOI 10.1016/j.radmeas.2008.06.002.
• Tsukamoto S, Nagashima K, Murray AS, Tada R, 2011. Variations in OSL components from quartz from Japan sea sediments and the possibility of reconstructing provenance. Quaternary International 234(1-2): 182-189, DOI 10.1016/j.quaint.2010.09.003.
• Vafiadou A, Murray AS, Liritzis I, 2007. Optically stimulated luminescence (OSL) dating investigations of rock and underlying soil from three case studies. Journal of Archaeological Science 34(10): 1659-1669, DOI 10.1016/j.jas.2006.12.004.
• Wallinga J, Murray AS, Duller GAT, 2000. Underestimation of equiva-lent dose in single-aliquot optical dating of feldspars caused by preheating. Radiation Measurements 32(5-6): 691-695, DOI 10.1016/S1350-4487(00)00127-X.
• Wallinga J, Bos AJJ, Dorenbos P, Murray AS, Schokker J, 2007. A test case for anomalous fading correction in IRSL dating. Quaternary Geochronology 2(1-4), 216-221, DOI 10.1016/j.quageo.2006.05.014