干旱区生态环境知识资源中心(Arid): 乌伦古湖沉积物粒度特征及其古气候环境意义

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	乌伦古湖沉积物粒度特征及其古气候环境意义
其他题名	Grain-size Characteristics of Wulugu Lake Sediments and Its Palaeoclimate and Palaeoenvironment Implication
	蒋庆丰; 刘兴起; 沈吉
ISSN	1000-0550
出版年	2006
卷号	24 期号:6 页码:877-882
中文摘要	利用乌伦古湖沉积钻孔的粒度资料,分析了粒度频率曲线、粒度参数和粒度组成等粒度特征,并探讨了乌伦古湖粒度代表的古气候意义.结果表明乌伦古湖沉积物频率曲线主要是正态单峰型,反映流水作用为主要沉积作用.岩芯下部(225～197 cm)沉积物分选较差,偏度和尖度较大,为浅水沉积环境;中部(197～103 cm)分选由差变好,物源由复杂变单一,为浅水沉积向深水沉积过渡环境;上部(103～0 cm)分选较好,物源单一,中值粒径减小,反映了湖水位的下降.沉积物粒度特征反映了乌伦古湖地区全新世降水、流水和风力作用以及湖面水位高低的变化.乌伦古湖一万年来的古气候环境演化大致经历了10 250～7 720 cal.aBP的干旱、7 720～2 800 cal.aBP的湿润和2 800 cal.aBP以来的偏干三个阶段.
英文摘要	Located in the westerly and arid area, Wulungu Lake is sensitive to climatic and environmental change. The grain-size characteristics of its sediments indicate that the variations of precipitation, hydrodynamics and wind action, and the lake level changes. The grain size characteristics of Wulungu Lake sediment are analyzed in this paper, including grain-size distribution, grain-size frequency curves and grain-size parameters. Based on the analysis of the characteristics of the grain-size frequency curves and grain-size parameters of the lake sediments, two action and two depositions such as fluvial and windy action, low-lake deposition and high-lake deposition are discussed. The results indicate that the fluviation was the main action and source of sediment in Wulungu Lake. And the Wulungu Lake had experienced three main environmental evolution stages since Holocene. It was dry in 10250～7720cal. aBP, wet in 7720～2800 cal. aBP, and dry again after 2800cal. aBP, respectively.
中文关键词	粒度特征 ; 古气候环境 ; 乌伦古湖
英文关键词	grain-size characteristics paleoclimate and paleaoenviromnent Wulungu Lake
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:2643751
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/219484
作者单位	中国科学院南京地理与湖泊研究所, 南京, 江苏 210008, 中国
推荐引用方式 GB/T 7714	蒋庆丰,刘兴起,沈吉. 乌伦古湖沉积物粒度特征及其古气候环境意义[J],2006,24(6):877-882.
APA	蒋庆丰,刘兴起,&沈吉.(2006).乌伦古湖沉积物粒度特征及其古气候环境意义.,24(6),877-882.
MLA	蒋庆丰,et al."乌伦古湖沉积物粒度特征及其古气候环境意义".24.6(2006):877-882.