风成沉积石英绿光释光测年的单片技术  

Luminescence Dating of Aeolian Sediments Using Single Aliquot Technique

作　　者：赖忠平[1] 周杰[1] 卢演俦[1] A.K.Singhvi 

机构地区：[1]中国科学院黄土与第四纪地质国家重点实验室,陕西西安710054 [2]EarthScienceDivisionPhysicalResearchLaboratory

出　　处：《中国沙漠》1999年第4期403-406,共4页Journal of Desert Research

基　　金：中国科学院资源环境重大项目!(KZ951-A1-402);国家自然科学基金重大项目!(49894170)

摘　　要：运用再生法进行单片技术测年所面临的主要问题是感量变化。论文探讨了石英绿光释光测年中对感量变化进行校正的方法，然后运用单片技术对沙漠黄土边界带风成沉积沙样进行等效剂量测定。结果表明。There are many advantages of single aliquot technique over conventional multiple aliquot technique: ① Precision. Since all the measurements for the \%ED\% (Equivalent Dose) are made on one aliquot, there is no need for normalization. ② Multiple determination of \%ED\% (age) for a sample. This enables the dating of heterogeneously bleached sediment\_\_fluvial or glacial sediments, by distinguishing the fully bleached grains. ③ Less efforts. Small number of discs required, and all the measurements can be done automatically within the RISOE machine. ④ Small sample required. Standard luminescence technique requires at least 30, even 60, discs to obtain one \%ED\%. ⑤ Can allow for the supralinearity of dose response in the low dose range.\; The most recent development in single aliquot technique is the single aliquot regenerative dose (\%SAR\%) protocol. The sensitivity change in the repeated luminescence measurements is the crucial problem for this protocol. In this paper, we examined the possibility for the sensitivity change correction on aeolian sediment quartz in \%SAR\% of GLSL (Green Light Stimulated Luminescence) dating. The sensitivity can be allowed for after the correction using the GLSL signal of test dose immediately after the GLSL measurement. GLSL dating results using \%SAR\% of six aeolian sediment samples from loess/desert transitional zone in China showed concordance with the ages of conventional multiple aliquot additive technique. \;The preheat is at 220℃ for \{10 s\} for \%SAR\%. The \%ED\%s showed a good plateau from 180℃ to 280℃ for \{10 s\} preheat. This plateau indicated that the thermal transferred signal due to the preheat was negligible in the sample.

关 键 词：光释光测年 单片技术 风成沉积物 石英绿 

分 类 号：P533[天文地球—古生物学与地层学] P597.3[天文地球—地质学]