干旱区生态环境知识资源中心(Arid): 库姆塔格沙漠东部复杂地貌地表沉积物化学元素组成初步研究

Arid

	库姆塔格沙漠东部复杂地貌地表沉积物化学元素组成初步研究
其他题名	Preliminary Study on the Geochemical Features of Sediments from Different Geomorphic Units of the Eastern Kumtagh Desert
	柳本立 1; 屈建军1 ; 杨根生 1; 牛清河 1; 安志山 1; 高艳红 2
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2014
卷号	34 期号:5 页码:1194-1199
中文摘要	通过对库姆塔格沙漠东部的沙漠、戈壁、绿洲、湿地、干河床等地貌单元地表沉积物化学元素的分析,研究了不同类型沉积物常量、微量元素的UCC标准值、Ba-Sr含量比值、化学蚀变指数等特征。结果表明:各类型沉积物的元素特征差异显著,但都处于低等风化阶段。库姆塔格沙漠东北端的平沙地、灌丛沙地与北侧戈壁地表沉积物元素特征相近,物源是北山;沙漠东缘沙物质有相近的主元素含量和Ba-Sr含量比值,化学风化特征和Fe、Mg含量自北向南呈现渐变趋势,表明受到偏北风的搬运混合作用,其可能的物源包括南部阿尔金山洪冲积物、东侧的干河床和戈壁。沙漠与敦煌绿洲间的戈壁地带化学风化微弱,区域差异不明显,但不同部位沙物质的元素含量有近源性。鸣沙山西侧的沙物质元素不同于库姆塔格沙漠,而与之相近的党河漫滩相近,因此其最有可能的物源是党河。
英文摘要	A geochemical study was conducted on the sediments from the east Kumtagh Desert and its nearby geomorphic units,including desert,gobi,oasis,wetland,wadi,et al.The contents of major and trace elements were compared with the upper continental crust’s average value (UCC),and the Ba-Sr ratio and chemical index of alteration(CIA) of each sample were analyzed.Preliminary results show a weak weathering level for all the samples,despite the significant differences among the sediments from different environments. The sediments from sandy land and vegetated land at the northeast corner of the Kumtagh Desert share similar geochemical features,indicating a same source-area of the North Mountain.Sands at the east of the desert have similar element components and Ba-Sr ratio and the chemical characteristics change gradually from north to south,indicating an aeolian mixture effect by the north winds.Potential sources of the desert sands include the alluvial deposits from the south Altyn Tagh Mountain,the gobi area to the east,and the wadis.The gobi area between the desert and the Dunhuang Oasis suffers from weak weathering,whereas chemical features of sediments at various locations are similar to their nearby potential source areas.Sand elements at the west Mingsha Megadune differ from the Kumtagn Desert clearly but are alike to the deposits in the Danghe River,thus the Danghe River is the most likely provenance of the Mingsha Megadune.
中文关键词	库姆塔格沙漠 ; 化学元素 ; 风化 ; 物质来源
英文关键词	Kumtagh Desert geochemical elements weathering material source
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:5242439
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/232212
作者单位	1.中国科学院寒区旱区环境与工程研究所敦煌戈壁荒漠生态与环境研究站, 中国科学院沙漠与沙漠化重点实验室, 兰州, 甘肃 730000, 中国; 2.中国科学院寒区旱区环境与工程研究所, 中国科学院寒旱区陆面过程与气候变化重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	柳本立,屈建军,杨根生,等. 库姆塔格沙漠东部复杂地貌地表沉积物化学元素组成初步研究[J]. 中国科学院西北生态环境资源研究院,2014,34(5):1194-1199.
APA	柳本立,屈建军,杨根生,牛清河,安志山,&高艳红.(2014).库姆塔格沙漠东部复杂地貌地表沉积物化学元素组成初步研究.中国沙漠,34(5),1194-1199.
MLA	柳本立,et al."库姆塔格沙漠东部复杂地貌地表沉积物化学元素组成初步研究".中国沙漠 34.5(2014):1194-1199.