Identification of partial resetting using De as a function of illumination time

被引:60
作者
Bailey, RM
Singarayer, JS
Ward, S
Stokes, S
机构
[1] Univ Oxford, Sch Geog & Environm, Oxford Luminescence Res Grp, Oxford OX1 3QJ, England
[2] Univ Bristol, Dept Geog Sci, Bristol BS8 1TH, Avon, England
关键词
quartz; optical; dating; resetting; fluvial; modern;
D O I
10.1016/S1350-4487(03)00063-5
中图分类号
TL [原子能技术]; O571 [原子核物理学];
学科分类号
0827 ; 082701 ;
摘要
Modem age samples from various depositional environments were examined for signal resetting. For 19 modem aeolian/beach samples all D-e values obtained were <0.5 Gy, with similar to70% having D-e<0.2 Gy. For 21 fluvial/colluvial. samples, all D-e values were <5 Gy with similar to80% being <1 Gy. D-e as a function of illumination (OSL measurement) time (D-e(t)) plots were examined for all samples. Based on previous laboratory experiments, increases in D-e(t) were expected for partially reset samples, and constant D-e(t) for fully reset samples. All aeolian samples, both modem age and additional 'young' samples (<1000 years), showed constant (flat) D-e(t) while all modem, non-zero D-e fluvial/colluvial samples showed increasing D-e(t). 'Replacement plots', where a regenerated signal is substituted for the natural, yielded constant (flat) D-e(t). These findings support strongly the use of D-e(t) as a method of identifying incomplete resetting in fluvial samples. Potential complicating factors, such as illumination (bleaching) spectrum, thermal instability and component composition are discussed and a series of internal checks on the applicability of the D-e(t) for each individual aliquot/grain level are outlined. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码:511 / 518
页数:8
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