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(DE)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DE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LN/TN比值的关系以及SMAR法测量中LN/TN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。
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~C was showed in preheat plateau test using both protocols. As was shown in measuring the values Tx/TN and LN/LT as a function of preheat temperatures, in dose recovery test in SAR and the value of LN/LT 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.
出处
《地震地质》
EI
CSCD
北大核心
2007年第2期390-401,共12页
Seismology and Geology
基金
国家发展与改革委员会发改投资"城市活断层试验探测项目"(20041138)
地震科学联合基金(201018)
国家自然科学基金(40202015)共同资助
