| 洱海沉积物化学元素与古气候演化 |
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| 引用本文： | 陈敬安,万国江.洱海沉积物化学元素与古气候演化[J].地球化学,1999,28(6):562-570. |
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| 作者姓名： | 陈敬安 万国江 |
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| 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，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，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，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 |
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| 基金项目： | 国家自然科学基金!49894170，49773207，49333040），中国科学院资助!KZ951－A1－402－06-04 |
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| 摘 要： | 测定了洱海沉积物中常量和微量元素的含量，利用因子分析方法，识别了控制沉积物化学组成的三个主要因子：流域侵蚀因子、早期成岩因子和湖 内生碳酸钙了。进一步 研究还发现，流域了和湖泊内生碳酸钙沉淀因子的因子得分曲线作为气候干湿和冷暖变化的代用曲线。从而为古气候重建提供了一条有效的新途径。结合沉积的柱＾２１０Ｐｂ和＾１３７Ｃ计年结果，初步评价了６００多年来洱海区域气候及环境演化历史，提示他该区暖干与冷湿相
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| 关 键 词： | 湖泊 沉积物 化学元素 因子分析 古气候 |
Chemical elements in sediments of Lake Erhai and palaeoclimate evolution |
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| Chen Jing''''an ,Wan Guojiang, Chen Zhenlou, Huang Ronggui.Chemical elements in sediments of Lake Erhai and palaeoclimate evolution[J].Geochimica,1999,28(6):562-570. |
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| Authors: | Chen Jing'an Wan Guojiang Chen Zhenlou Huang Ronggui |
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| Abstract: | The major and minor chemical elements in the sediments of Lake Erhai were determined.Three important factors were identified using factor analysis method, which control chemicalcomposition of sediments, such as catchment erosion, diagenetic modification and endogeniccalcium carbonate precipitation. Moreover, further research indicates that the factor scorecurves of catchment erosion and endogenic calcium carbonate precipitation can be used torepresent the changes of humidity and temperature respectively, which provides a new effectiveapproach to palaeoclimate reconstruction. On the basis of the dating result of 210Pb and 137Csmethods, the evolution history of the regional climate and environment is evaluated, and it isrevealed that the basic climate succession in the region of Lake Erhai is the warm-dry and thecold-humid alternatively. The cold-humid period between 1551 AD and 1886 AD may be theimprint left in the region of Lake Erhai by the little ice age. |
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| Keywords: | lake sediments chemical elements factor analysis palaeoclimate Lake Erhai |
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