摘要
释光测年使用的材料通常为石英与钾长石,但当沉积物中缺乏这两种矿物时这一方法就会受到限制,有待开发新的测年材料。生物硅(Biogenic Silica,BSi)是一种生物来源的无定形含水二氧化硅(SiO_(2)·nH_(2)O),主要以硅藻、植硅体、海绵骨针、放射虫与硅鞭毛藻等形式广泛分布于各类第四纪沉积物中。前人研究表明,生物硅存在释光现象,具有成为第四纪沉积物可靠测年材料的潜力,有望应用于泥炭、硅藻土等缺乏无机碎屑矿物的富硅生物沉积以及有机质保存较差的沉积物的定年。本文系统总结了生物硅释光测年研究的现状,探讨了生物硅释光测年的潜在优势及当前存在的问题与挑战,提出进一步推广其应用的重点在于加强提纯方法、释光特性、剂量率测定及埋藏过程等方面研究。如果这些问题得到解决,生物硅将在古环境和考古研究中得到更广泛的应用,可以获取沉积物及其文化背景直接和可靠的年代。
Quartz and feldspar serve as the common material for the luminescence dating of sediments.However,a limitation arises when applying this dating technique to sediments lacking these minerals.New materials are expected to be developed to overcome this limitation.Biogenic silica(BSi),an amorphous hydrated silica(SiO_(2)·nH_(2)O),derived from biological sources,is predominantly found in various types of the Quaternary sediments in the form of diatoms,phytoliths,sponge spicules,radiolarians and silicoflagellates.Previous research has indicated that BSi exhibits the luminescence properties and demonstrates significant potential as a reliable material for dating the Quaternary sediments.This material also holds promise for dating biogenic silicon-rich sediments,such as peat and diatomite that lack the inorganic detrital minerals,as well as those with poorly preserved organic matter.This paper aims to provide a comprehensive overview of the current research status of BSi luminescence dating while discussing its potential benefits,the challenges and obstacles that lie ahead.To promote the application of BSi luminescence dating,future research should focus on developing effective purification methods and advancing research on the luminescence properties,dose rate measurements,and burial processes.By addressing these limitations,BSi is expected to be more widely applied in paleoenvironmental and archaeological research by providing the direct and reliable dates for the sediments and the cultural contexts.
作者
汪师哲
左昕昕
靳建辉
WANG Shizhe;ZUO Xinxin;JIN Jianhui(Institute of Geography,Fujian Normal University,Fuzhou 350117,China;Key Laboratory of Subtropical Resources and Environment of Fujian Province,Fujian Normal University,Fuzhou 350007,China;Center for Environmental Archaeology in Southeast China of Fujian Normal University,Fuzhou 350400,China)
出处
《微体古生物学报(中英文)》
北大核心
2025年第2期162-173,共12页
Acta Micropalaeontologica Sinica
基金
福建省科技厅公益类重点项目(2023R1041)
国家自然科学基金项目(42477478)共同资助。
关键词
生物硅
硅藻
植硅体
释光特性
释光测年
biogenic silica
diatom
phytolith
luminescence properties
luminescence dating
