细颗粒石英光释光测年:简单多片再生法  

LUMINESCENCE DATING OF FINE-GRAINED QUARTZ IN CHINESE LOESS-SIMPLIFIED MULTIPLE ALIQUOT REGENERATIVE-DOSE (MAR) PROTOCOL

作　　者：王旭龙[1] 卢演俦[2] 李晓妮[1] 

机构地区：[1]中国科学院地球环境研究所,黄土与第四纪地质国家重点实验室,西安710075 [2]中国地震局地质研究所,地震动力学国家重点实验室,北京100029

出　　处：《地震地质》2005年第4期615-623,共9页Seismology and Geology

基　　金：黄土与第四纪地质国家重点实验室基金(SKLLQG0530);地震科学联合基金重点课题(201018)共同资助。

摘　　要：文中报道了细颗粒石英光释光测年中测量等效剂量的一种可靠技术——简单多片再生法。该技术的核心是引入单片再生法中试验剂量校正感量变化的功能,即在天然和再生多测片光释光信号测量后,再对各测片辐照以试验剂量,利用试验剂量的光释光信号响应对各测片归一化,同时校正可能发生的感量变化。从方法学上,这一技术具有以下优点1)试验剂量可以校正各测片的感量变化;2)对各测片归一化,克服了实验数据分散度的问题;3)通过对比简单多片再生法与单片再生法在测年中的表现,证实简单多片再生法可以克服单片再生法中可能发生的光释光信号的积累问题。最后,文中通过测定参考年龄样品,即洛川剖面末次冰期马兰黄土(L1)的开始堆积年龄,验证了简单多片再生法的可靠性,即在提高测量准确度和精度的同时,更节约时间。A Simplified Multiple Aliquot Regenerative-dose （MAR） protocol is introduced in this paper, in which after each natural and regenerative-dose OSL （L1） measurements, the OSL response （ Ti） to the test dose is used to monitor the sensitivity changes for multiple aliquots as Single-Aliquot Regenerative-dose （SAR） protocol does on single-aliquot. From the methodological aspects, Simplified MAR protocol can correct for the sensitivity changes, overcome the scattering of the experimental data in MAR measurement procedures and possibly avoid the buildup of OSL signals that happens in the SAR protocol; these lead to recover De values with high accuracy and precision. When comparing the OSL ages obtained in this way with the reference age of the MISS/4 transition from the SPECMAP record, no apparent age underestimation occurred. On the basis of the methodology and validated by dating reference age samples, Simplified MAR protocol is a reliable and timesaving way for luminescence dating of fine-grained quartz in Chinese loess.

关 键 词：简单多片再生法 等效剂量 感量变化 试验剂量 细颗粒石英 

分 类 号：P597.3[天文地球—地球化学]