| 第四纪沉积物光释光测年中等效剂量测定方法的对比研究 |
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| 引用本文： | 陈杰,魏兰英.第四纪沉积物光释光测年中等效剂量测定方法的对比研究[J].地球化学,1999,28(5):443-452. |
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| 作者姓名： | 陈杰 魏兰英 |
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| 作者单位： | 中国地震局地质研究所!北京100029(陈杰，卢演俦，尹功明，孙瑛杰，胡碧茹)，中国科学院地质研究所!北京100029(魏兰英)，中国科学院西安黄土与第四纪地质国家重点实验室!西安710054(赵华) |
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| 基金项目： | 国家自然科学基金!（ 编号：49573196），国家地震局“八五”重点项目!（ 编号：85142） |
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| 摘 要： | 准确地测定碎屑矿物沉积后吸收的等效剂量第四纪沉积物释光测年中最关键的一环。用光释光测年技术对几年全新世坡积物，古土地和黄土等样品中的石英，长石等碎屑矿物进行了测定等效剂量的对比研究。
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| 关 键 词： | 第四纪 沉积物 光释光测年 等效剂量测定 |
Optically stimulated luminescence dating of Quaternary sediments: A comparison using different equivalent dose determination methods |
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| Abstract: | It is a key process to precisely measure the post depositonal accumulated absorbed dose (or equivalent dose, Deq) of debris minerals in sediments for OSL methods dating the last exposure to sunlight. A variety of methods for calculating the Deq of a sample were introduced by Wintle and Huntley in 1980. These methods have been developed and subsequently refined since then, and can be divided into five approaches: additive dose, total bleach, regeneration, partial bleach and Australian slide. However, there has never been widespread agreement as to which of these approaches is the most appropriate. Several young (t<10 000 a) known age material deposited under known conditions, such as loess, paleosoil, and talus, were selected. Their Deq values were obtained using different approaches in order to determine the best method for these young sediments. The results indicate that the regeneration and Australian slide methods have been shown to yield the best results in general. The partial bleach technique, when properly applied (with proper partial bleaching time and linear growth curve), seems to be reliable with rather large error. The additive dose and total bleach methods seem to be unreliable and usually yield misleadingly old ages. For sample 97049 and 97050 containing both quartz and feldspar, the same aliquots were first stimulated using infrared emitting diodes with peak emission wavelengths of 880 nm, and then were stimulated using green light with peak emission wavelengths of 514 nm. The results of IRSL and GLSL dating are consistent very well. This maybe indicate that the results of OSL dating can be self tested using different stimulated wavelengths for the same sample. |
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| Keywords: | Quaternary sediment optically stimulated luminescence dating equivalent dose determination |
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