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云南洱海沉积物粒度组成及其环境意义辨识
引用本文:陈敬安,万国江.云南洱海沉积物粒度组成及其环境意义辨识[J].矿物学报,1999,19(2):175-182.
作者姓名:陈敬安  万国江
作者单位:中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳,550002
基金项目:国家自然科学基金!49894170,49773207
摘    要:高原封闭,半封闭湖泊是气候和环境演化的敏感指示器,其沉积物记录具有连续性,敏感性和高分辩率的特点,在恢复和重塑各种短时间凡度的气候和环境演化序列上,具有其它自然历史记录无法替代的优势。

关 键 词:湖泊沉积  粒度组成  准周期波动  暖干-冷湿  洱海

SEDIMENT PARTICLE SIZE DISTRIBUTION AND ITS ENVIRONMENTAL SIGNIFICANCE IN LAKE ERHAI,YUNNAN PROVINCE
Chen Jingan,Wan Guojiang.SEDIMENT PARTICLE SIZE DISTRIBUTION AND ITS ENVIRONMENTAL SIGNIFICANCE IN LAKE ERHAI,YUNNAN PROVINCE[J].Acta Mineralogica Sinica,1999,19(2):175-182.
Authors:Chen Jingan  Wan Guojiang
Institution:State Key Lab. of Environmental Geochemistry. lnsutute of Geochemistry. Chinese Academy of Sciences .Guiyang 550002
Abstract:The enclosed or sen1i-enclosed plateau-lake .whose sediment records can provide us with plenty of fine and high resolution information,is a sensitlve indicator of climatic and environmental changes. During the recons t ruct ion of various short -time-scale climatic and environmental changes,the geochem1cal records in plateau-lake sediments are superior to other natural files. Based on fine dissection of the vertlcal profile of sedimenl partlcle sizes, this paper reveals the quasi-periodical changes of sediment particle slzes,which indicates the quasi-periodical fluctuations of the regional climate. According to the synthetlc analysis of multiple indexes. the following conclusions are drawn: (1) sediment particle size is a more sensitive and effective index of climatic and environmental changes than 0ther geochemlcal indexes: (2) the baslc climate succession in the region of Lake Erhai is warm-dry and cold-humid in turn and it has been developing into a warm-dry climate as a whole; (3) there exist at least 2 time-scales quasl-perlodical fluctuations of the regional climate in Lake Erhai. At present,the reglon of Lake Erhai is at the end of the warm-dry period and at the beginning of the cold-humid period ,so the temperature will fall and the water level will rise.
Keywords:Lake Erhai  sediment particle size  quasi-periodical change
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