ZHOU Liping, NIAN Xiaomei
Department of Geography, Peking University, Beijing 100871, China
FIRST PARAGRAPH: Optically stimulated luminescence dating method can be applied to obtain depositional age or burial age of the sediments in a variety of sedimentary environments. The physical basis of this method is that mineral grains are exposed to the sunlight/daylight during the transportation; hence the previously stored luminescence signals in the minerals are set to zero upon deposition. The decay of the radioactive nuclides in the sediments will generate radiation which interacts with the sediment grains, in essence, transferring energy from the ambient environment to the mineral grains and the amount of the energy stored in these grains being proportional to the time since their last exposure to the sunlight/daylight. To establish chronology for Paleolithic archaeological sites, a common approach involves dating of the sediments above and below the layers which yield artifacts or fossil remains. The ages of the sediments embracing the cultural layers provide constraints on the time of the human occupation or other activities at the sites.
Recieved: Oct.10, 2010 Accepted: Dec.2, 2010 Corresponding: lpzhou@pku.edu.cn
《现代人类学通讯》第四卷e33篇 第188-189页 2010年12月16日网上发行
会议摘要
光释光测年技术的最新进展及其在中国北方旧石器考古和古人类遗址点年代框架研究中的意义
周力平,年小美
北京大学城市与环境学院,北京100871
首节:光释光测年方法可以用来测量各种沉积物的埋藏年龄,其物理原理是:沉积物的矿物颗粒在搬运过程中经过光的晒退,使其以前积累的光信号归零,在后期埋藏过程中由于沉积物中放射性核素的衰变发射出具有一定能量的射线,这些射线与矿物颗粒的相互作用将能量从周围环境中转移到矿物颗粒中进行储存,而其储存信号的多少正比于这些矿物颗粒最后一次见光以来的时间。在建立考古遗址点的年代框架过程中,通常是测量考古遗址点含石器或化石遗存层上下沉积物的年龄。与文化层相关的沉积物年龄可以给出古人在遗址点生活的时间。