干旱区生态环境知识资源中心(Arid): 青海湖QHl孔晚全新世沉积物稀土元素地求化学与气候环境关系探讨

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	青海湖QHl孔晚全新世沉积物稀土元素地求化学与气候环境关系探讨
其他题名	Geochemistry of REE in QH1 Sediments of Qinghai Lake since late Holocene and lts Paleoclimatic Significance
	史基安; 郭雪莲; 王琪; 严宁珍; 王疆霞
来源期刊	湖泊科学
ISSN	1003-5427
出版年	2003
卷号	15 期号:1 页码:28-34
中文摘要	通过对青海湖QHI孔沉积物稀土元素丰度、分布模式及稀土总量（REE）的分析，结合沉积物中TOC含量、粒度参数的变化物征，探讨了稀土元素纵向变化与气候环境之间的关系。结果表明：青海湖沉积物中稀土元素总丰度值不高，平均值为63mg/kg（不包括Y）左右。总体上表现以半干旱的环境为主导，化学内化作用相对微弱.同时，湖泊沉积物具有轻稀土相对富集、缓右倾元素斜型、Be、Du基本上无明显异常的REE分布模式.稀土元素与总有机碳（TOC）、粒度之间存在较好的相关性。分析表明，沉积物REE 高值段指示暖湿气候环境，REE低值段代表冷干气候环境.根据稀土元素分布与沉积环境的关系，重建了8500aBP以来青海胡区经历4次较大的暖湿-温干-暖偏湿-冷偏干的气候演化过程.从而得出在高寒半干旱地区的青海湖泊沉积物稀土元素对古气候变化具有良好的指示作用。
英文摘要	Rare earth element(REE)concentration and distribution patterns and vertical distribution of total REE(REE)in sediments from Qinghai Lake are presented in this paper,In combination the climate and environment has been discussed The relationship between REE and the climate and environment has been discussed The result shows that the REE values of the sediments from Qinghai Lake vary over a range of 16.262-89-221mg/kg.with an average of 63.001mg/kg .Indicating that the semi-arid environment was dominant with much weaker chemical weathering.The sediments from Qinghai Lake have very similar REE distribution patterns,which are moderately rich in light rare earth element(LREE).with negative slopes and unclear Be and Du anomaly,REE contents have good relationships with TOC and Guain Size During warmer and wetter climatic episodes.the values of REE in sediments are higher;on the contrary,during colder and drier climatic episodes.the values of REE are lower.The further study has reconstructed the paleoclimate evolution of Qinghai Lake since 8.5kaBP,which includes four main climatic and environmental changes that were warm-moist,cool-dry,warm-moist and cold-dry during late Holocene.Finally.we have concluded that REE in sediments of Qinghai Lake is an effective indicator to reconstruct the paleoclimatic variation in the high-cold semi-arid areas because of its sensitivity to the climatic changes.
中文关键词	稀土元素 ; 分布模式 ; 古气候 ; 青海湖
英文关键词	Rare earth element(REE) paleoclimate Qinghai Lake
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Geology
WOS研究方向	Geology
CSCD记录号	CSCD:1300765
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/204150
作者单位	史基安, 中科院兰州地质所, 兰州地质研究所气体地球化学国家重点实验室, 兰州, 甘肃 730000, 中国.; 郭雪莲, 中科院兰州地质所, 兰州地质研究所气体地球化学国家重点实验室, 兰州, 甘肃 730000, 中国.; 王琪, 中科院兰州地质所, 兰州地质研究所气体地球化学国家重点实验室, 兰州, 甘肃 730000, 中国.; 严宁珍, 西南农业大学资源与环境学院, 重庆 400716, 中国.; 王疆霞, 长安大学水环境科学系, 西安, 陕西 710054, 中国.
推荐引用方式 GB/T 7714	史基安,郭雪莲,王琪,等. 青海湖QHl孔晚全新世沉积物稀土元素地求化学与气候环境关系探讨[J],2003,15(1):28-34.
APA	史基安,郭雪莲,王琪,严宁珍,&王疆霞.(2003).青海湖QHl孔晚全新世沉积物稀土元素地求化学与气候环境关系探讨.湖泊科学,15(1),28-34.
MLA	史基安,et al."青海湖QHl孔晚全新世沉积物稀土元素地求化学与气候环境关系探讨".湖泊科学 15.1(2003):28-34.