高分辨率古环境指示器--湖泊纹泥研究综述

作为高分辨率古环境指示器，湖泊纹泥在重建晚第四纪特别是近代全球环境变化中具有特殊的地位和意义。纹泥携带的各种季节信息反映了区域生物学、地球化学、沉积学对季节性驱动力的响应，而且纹泥本身可以提供反映沉积环境和气候变化的精确计年，近３０年来湖泊纹发展历史表明，纹泥的应用主要集中于以下三个方面：纹波计年、纹泥厚度变化和纹泥沉积物分析，其中纹 精确测年是一切应用的基础。可以看出，在古环境研究中，纹泥作为一

REVIEW ON THE HIGH-RESOLUTION VARVED LAKE SEDIMENTS AS A PROXY OF PALEOENVIRONMENT

Varved lacustrine sediments are high resolution archives of paleoenvirnmental conditions.They are generally regarded as a potential source for understanding how the past variability may be effected by climatic forcing and/or non climatic factors in late Quaternary,especially in the past 2 000 years.They may provide some of the longest and most useful records of past interannual to decadal scale climatic variability.The regional biological,geochemical and sedimentological responses to the seasonal climatic changes are genuinely recorded in varved sediments.Most important of all,varves can provide an absolute chronology based on calendar years and information about processes in the lake and the catchment area. The applications of varved lacustrine sediements could be categorized into tree types,i.e.absolute dating obtained and applications;varve thickness fluctuations and correlation with climatic factors;analysis on the content of the sediment in the varves and synthetic interpetation.With few exceptions,the definite chronology obtained through varve counting provieds a bound basis for further research.In former times,varves were merely used as effective though controversial tool for its absolute dating.During the last 30 years,the information stores in the couplets has been increasingly notified.With the development of freeze coring as well as the advancing of analytical techniques,more and more interpretations with interannual to decadal scale resolutions have been obtained.It is anticipated that varve studies in a more systematic way will be favored.