收稿日期: 1998-07-03
修回日期: 1998-09-28
网络出版日期: 1999-04-01
基金资助
“九五”国家攀登计划青藏项目和中国科学院“九五”重大项目“青藏高原湖泊现代沉积过程与古环境解释”(KZ951-A1-202-02)资助。
REVIEW ON THE HIGH-RESOLUTION VARVED LAKE SEDIMENTS AS A PROXY OF PALEOENVIRONMENT
Received date: 1998-07-03
Revised date: 1998-09-28
Online published: 1999-04-01
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年来湖泊纹泥应用研究发展历史表明,纹泥的应用主要集中于以下三个方面:纹泥计年、纹泥厚度变化和纹泥沉积物分析,其中纹泥提供的精确测年是一切应用的基础。可以看出,在古环境研究中,纹泥作为一个高分辨率指标,它的应用已从单纯的测年控制,逐渐深入到对纹泥层偶本身携带的信息的研究。采用多学科交叉、多指标综合进行系统研究是未来纹泥应用的主要方向。
李万春,李世杰,濮培民 . 高分辨率古环境指示器——湖泊纹泥研究综述[J]. 地球科学进展, 1999 , 14(2) : 172 -176 . DOI: 10.11867/j.issn.1001-8166.1999.02.0172
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.Theymay provide some of the longest and most useful records of past interannual to decadal-scale climatic variability.The regional biological,geochemical and sedimentological responses tothe seasonal climatic changes are genuinelyrecorded in varved sediments.Most importantof all,varves can provide an absolute chronology based on calendaryears 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 correlationwith 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,varveswere 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 aswell as the advancing of analytical techniques,more and more interpretationswith interannual to decadal-scale resolutions have been obtained.It is anticipated thatvarve studies in amore systematicwaywill be favored.
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