释光技术在水成沉积物测年中的应用进展

The Application Progress of Water-laid Deposits Luminescence Dating

准确获得水成沉积物的年龄是第四纪年代学重要的前沿问题之一。随着释光技术的发展,水成沉积物释光测年在如下方面有新的进展:具体释光技术的选择、释光测量方法、测年矿物的种类、矿物的粒级和获得等效剂量的统计方法等。线性调整光释光技术能够提取光释光信号中衰退快的组分;单片再生法应用广泛;单颗粒技术在挑选沉积时晒退充分的颗粒方面具有一定的优势;水成沉积物中的石英比长石更易晒退;较多的实验表明水成沉积物中的粗颗粒比细颗粒更易晒退;获得等效剂量的统计模型很多,但尚无一种统计模型适用于所有样品。在此基础上探讨了水成沉积物释光测年在气候、构造运动、冰川进退历史和人类活动主导的土壤侵蚀量变化研究中的意义及今后的研究方向,为全面了解该领域的最新研究进展提供参考。

It is one of the significant frontier issues that obtain the ages of water-laid deposits in the quaternary geochronology. There are some new progresses in the following areas with the development of thermolumineseence ： specific luminescence technique, luminescence method, luminescence mineral species, mineral grain size and statistical method of obtaining equivalent dose. Single-aliquot regenerative-dose protocol is used widely; the fast component of OSL signal can be measured by linearly modulated optically stimulated luminescence （LM-OSL） ; single-grain optical dating procedures have a certain advantage in identifying the fully bleached grains; quartz is more easily bleached than feldspar from the water-laid deposits; more and more experiments demonstrate that coarse grains are more sensitive to light than fine grains; there is no statistic model among the numerous that can be used to measure the equivalent dose from all samples. On this basis discussed the significance of luminescence dating and future direction for water-laid sediments in climate, tectonic, history of glacier movement and amount of soil erosion dominated by human activities research, provided comprehensively references in acquiring the latest research progress of the field.