摘要
近几年光释光测年技术有了很大的发展 ,主要体现在单片技术和单颗粒技术的建立与应用上。新技术降低了样品的用量 ,提高了测量精确度 ,并使得准确测定不均匀晒退沉积物的年龄成为可能。通过澳大利亚旧石器遗址多种释光技术测年结果的对比 ,可以看到热释光法和光释光法对晒退彻底的沉积物同样可行 ,而对不均匀晒退的沉积物 ,只有光释光的单片技术才能获得可靠的年龄。由于我国旧石器遗址中大多缺乏彻底晒退的沉积物 ,单片技术可能在建立这些遗址的年代框架方面起到重要作用。
Optically stimulated luminescence (OSL) dating is becoming an important Quaternary dating method, especially for sediments that cannot be dated by other methods, such as ()^(14)C and uranium-series. OSL dating can usually be reliably applied to sediments of ages ranging from decades to more than 100 kyr. The rapid development of OSL dating techniques over recent years is embodied by the establishment of single-aliquot protocols —— in particular, the single-aliquot regenerative-dose (SAR) protocol. These new techniques require much less sample for analysis than multiple-aliquot protocols and often result in an improvement in precision of equivalent dose estimates. In addition, single-aliquot methods make it possible to date sediments composed of grains that have been bleached by sunlight to different extents at the time of deposition. Various luminescence dating techniques have been applied to Paleolithic sites in Australia in order to provide age controls beyond the practical dating range of ()^(14)C. Results show that both thermoluminescence (TL) and OSL dating are feasible methods for sediments that have been sufficiently bleached at the time of deposition, while only single-aliquot protocols can be used to retrieve reliable age data from unequally and incompletely bleached samples. Because of the paucity of well bleached sediments at Paleolithic sites in China, single-aliquot protocols are believed to be the best choice to establish a luminescence-based temporal framework.
出处
《人类学学报》
CSCD
北大核心
2004年第3期248-253,共6页
Acta Anthropologica Sinica
基金
黄土与第四纪地质国家重点实验室开放基金 (批准号 :SKLLQG0 30 3)
