Progress towards a polymineral single-aliquot OSL dating procedure.
Published single-aliquot regenerative-dose (SAR) procedures for quartz use a 'cutheat' different from the pre-heat. In contrast, previous work has shown that the SAR procedure can be used to correct for sensitivity changes exhibited by feldspars if the cutheat is equal to the pre-heat. In this paper, a procedure that corrects for sensitivity changes in both quartz and feldspar is tested. The results indicate that for sedimentary quartz the cutheat can be equal to the pre-heat. Thus, it may be possible to develop one procedure to measure equivalent doses in a polymineral sample. We also tested several different optical stimulation methods. Using the infrared (IR)-stimulated signal from a post-IR blue-stimulated optically stimulated luminescence sequence extends the potential age range when using feldpathic materials. In addition, since the post-IR blue-stimulated signal from feldspar is much smaller than the blue-stimulated signal from quartz, the possibility exists of extracting a 'quartz signal' from a mixed mineral sample.
Physics Department, Oklahoma State University, 145 PS II, Stillwater, OK 74078, USA. blairmw@okstate.edu
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Blair
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Yukihara
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McKeever
D000465:Algorithms; D000538:Aluminum Silicates / Q000032:analysis* / Q000528:radiation effects*; D005844:Geology / Q000379:methods*; D006207:Half-Life; D006358:Hot Temperature; D008027:Light; D008422:Materials Testing / Q000379:methods*; D008903:Minerals / Q000032:analysis* / Q000528:radiation effects*; D017680:Potassium Compounds / Q000032:analysis* / Q000528:radiation effects*; D013819:Thermoluminescent Dosimetry / Q000379:methods*
D000538:Aluminum Silicates; D008903:Minerals; D017680:Potassium Compounds; C016447:feldspar