水成沉积物回授光释光测年可行性初探  

PRELIMINARY STUDY OF RE-OSL ON WATER-DEPOSITED SEDIMENTS

作　　者：纪洪磊[1] 赵华[1,2] 王成敏[1] 毛洪亮[1] 卢演俦[2] 

机构地区：[1]中国地质科学院水文地质环境地质研究所,石家庄050061 [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》2010年第2期320-326,共7页Seismology and Geology

基　　金：中国地质科学院水文地质环境地质研究所基本科研业务费项目(SK07011;SK200907)资助

摘　　要：通过对滹沱河冲洪积物、阳原盆地湖相地层细颗粒石英天然热转移光释光(TT-OSL)信号测量、回授剂量恢复测试以及简单多片光释光(OSL)与回授光释光(Re-OSL)测量结果对比等,探讨了细颗粒石英回授光释光在水成沉积物测年中应用的可能性。结果表明,冲积样品回授光释光信号没有随深度逐步增加的规律,而湖相样品热转移光释光信号随深度逐渐增大;冲洪积物细颗粒石英样品回授光释光不能得出剂量值,剂量不能恢复;而湖相样品回授实验室附加剂量与测得的剂量在2%的误差范围内一致,说明回授光释光测年在一定时间范围内对于湖相样品测年是可行的;细颗粒石英回授释光在测量>10万a的湖相样品年龄方面具有很大的潜力。According to measuring the natural TT-OSL signals of the fine-grained quartz from both fluvial and lacustrine sediments,the dose recovery experiment and the comparison of the multiple aliquots fine-grained quartz SMAR and Re-OSL dating results,the possibility of Re-OSL dating with fine-grained quartz for water-deposited sediments has been studied.The results show that,the Re-OSL signals accumulated in the fine-grained quartz from fluvial sediments are lack of regularity with the depth,and the Re-OSL signals of the fine-grained quartz can not yield the dose values;While the Re-OSL signals of the lacustrine sediments increase gradually with the depth.The Re-OSL dose measured and laboratory additional dose are consistent within 2%error range,which indicates that the Re-OSL dating with the fine-grained quartz for lacustrine sediments is feasible to some range of time.The Re-OSL dating method has much potential for dating the lacustrine samples more than 100ka years.

关 键 词：水成沉积物 细颗粒石英 热转移光释光 回授光释光 

分 类 号：P597[天文地球—地球化学]