摘要
人类世作为一个新近被确定的地质年代单位,对其开展相关研究要求较高的时间分辨率,因此需要寻找合适的定年方法.目前主要的定年方法有137Cs、210Pb和239,240Pu定年,相比其他两种方法,210Pb定年适用范围广,在环境中的地球化学行为和分布相对稳定,测年可靠性相对更高,可用于人类世河口、湖泊和海洋等多种沉积环境的定年和沉积速率的估算.总结了210Pb定年方法及其定年原理与模式,分别阐述了 210Pb定年法在河口、湖泊和海洋等不同沉积环境中建立人类世年代标尺与沉积速率获取时的应用,并讨论了其影响因素,指出了210Pb定年法的误差来源,如沉积速率的变化等,需要深入研究这些误差来源.未来研究可以考虑将210Pb定年与其他定年方法相结合,从而得到更全面和准确的人类世年代框架.总之,210Pb定年法在人类世的研究中将继续发挥重要作用,帮助我们更好地了解人类活动与地球环境演变的关系.
Abstract
Research on the Anthropocene—a newly determined geological chronological unit—requires higher temporal resolution,which necessitates the identification of appropriate dating methods.Currently,the main dating methods involve 137Cs,210Pb,and 239,240Pu isotopes.Compared with 137Cs and 239,240Pu dating,210Pb dating has a wider application range,relatively stable geochemical behavior and distribution in the environment,and relatively high dating reliability.It can be used to estimate sedimentation rates in Anthropocene estuaries,lakes,oceans,and other sedimentary environments.This paper summarizes the 210Pb dating method,dating principle,and model,and expounds the application of 210Pb dating for the establishment of the Anthropocene age scale and acquisition of sedimentary rates in different sedimentary environments,such as estuaries,lakes,and oceans.It also discusses its influencing factors,and indicates that there are certain error sources in the 210Pb dating method,such as changes in sedimentary rates,which require further study.Future research should combine 210Pb dating with other dating methods to obtain a more comprehensive and accurate Anthropocene chronological framework.210Pb will continue to play an important role in the study of the Anthropocene,helping us to better understand the history and future of Earth.
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