Title: REVIEW ON THE HIGH RESOLUTION VARVED LAKE SEDIMENTS AS A PROXY OF PALEOENVIRONMENT
Abstract: 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.
Publication Year: 1999
Publication Date: 1999-01-01
Language: en
Type: article
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