海洋沉积物释光测年现状与展望

A review of luminescence dating on marine sediments

自释光现象被用于沉积物测年的半个多世纪以来,释光测年技术已被广泛应用于各类海洋沉积物的年代测定,为古环境古气候和构造活动及地形地貌演变等研究提供了高精度年代学约束的同时,释光测年技术的精度和准确性也取得了长足发展。在系统回顾和总结海洋沉积物释光测年的发展历史基础上,详细讨论了释光测年技术在海洋沉积物测年中的研究现状,总结了全球海洋沉积物释光测年研究的特点。海洋沉积物的沉积埋藏过程相对复杂,部分晒退现象普遍存在,饱和含水的沉积环境导致环境剂量精确测定存在一定困难。因此在海洋沉积物年代测定和计算过程中需要根据实际情况对样品的释光性质进行分析,选择合适的等效剂量测试方法,并使用合适的环境剂量校正方法进行年代计算。释光测年方法在晚更新世以来海洋沉积物测年中表现出了独特的优势,释光测年目标矿物在海洋沉积物中普遍存在,并且随着近年来研究的不断深入,测年精度也得到了明显的提高,可以为晚更新世以来的海洋沉积物研究提供高精度的绝对年代地层格架。

During the past 50 years,luminescence dating has been widely applied to dating various marine sediments,which provides important chronological constraints for researches on climate,structure,and geomorphic activities.This paper summarizes articles related to luminescence dating on marine sediments and discusses the details of the development of luminescence dating methodology as well as its applications for marine sediments.The characteristics of luminescence dating on marine sediments in different regions around the world and their contributions to dating the marine sediments by luminescence dating have been summarized.The deposition and burial processes of marine sediments are relatively complex,and insufficient bleaching phenomena are ubiquitous.The saturated water-bearing sedimentary environment makes it difficult to accurately determine the annual dose.Therefore,in the process of dating and calculating the luminescence ages of marine sediments,it is necessary to analyze the luminescence properties of specific samples,select the appropriate equivalent dose test method,and adopt the appropriate annual dose correction method for age calculation.The luminescence dating method has shown unique advantages in various studies of marine sediments since the late Pleistocene.The targeted minerals for luminescence dating commonly exist in marine sediments.With great developments in recent years,the age accuracy has also been significantly improved,which can provide a high-precision absolute chronostratigraphic framework for various studies of marine sediments since the late Pleistocene.