Abstract: The fine-grain quartz extracted from two burnt reworked loess samples LEDL0588H and LEDL0365 was measured by modified SAR and SMAR protocols for OSL dating.The fast component is dominant in OSL signals.The identical De in the thermal treatment from 180～260℃was showed in preheat plateau test using both protocols.As was shown in measuring the values T_X/T_N and L_N/L_N as a function of preheat temperatures,in dose recovery test in SAR and the value of L_N/L_N in SAR and SMAR protocols,OSL signal sensitivity changes were well corrected.Both methods can be used to estimate De of the two samples properly for OSL dating.Although located at different strata levels,the similar OSL ages of two samples suggest the latest time they were burnt may be at a same period of human activity.

Key words: OSL dating, SAR, SMAR, fine-grained quartz, Haiyuan Fault, burnt reworked loess

摘要： 选择海原活动断裂带刺儿沟剖面2个烘烤次生黄土样品LEDL0588H和LEDL0365的细颗粒石英,采用改进后的单测片再生法(SAR)和简单多测片再生剂量法(SMAR)进行了一系列实验研究。2个样品细颗粒石英的光释光信号均以快速组分为主,其等效剂量(D_E)的预热坪实验表明,在180～260℃的预热温度范围内均能获得基本一致的D_E值。SAR法测量不同预热温度下的释光感量变化、剂量恢复实验和L_N/T_N比值的关系以及SMAR法测量中L_N/T_N比值与预热温度的关系的研究表明,文中所采用的流程能有效地校正测量过程中释光信号感量变化。2种方法均适用于采自不同层位的2个烘烤样品细颗粒石英的OSL测年,并获得了非常接近的OSL年龄。2个样品最后一次被烘烤的时间可能代表的是同一时期的人类活动。

关键词: OSL测年, 单测片再生法, 简单多片再生法, 细颗粒石英, 海原断裂带, 烘烤次生黄土