干旱区生态环境知识资源中心(Arid): 西风区末次冰期以来昭苏黄土剖面微量元素分布特征及其环境意义

Arid

	西风区末次冰期以来昭苏黄土剖面微量元素分布特征及其环境意义
其他题名	The characteristics of distribution of trace elements and their paleoclimatic implications at the Zhaosu Loess Section in Westerly Area since the Last Glacial Period
	李传想 1; 宋友桂 2
来源期刊	地球环境学报
ISSN	1674-9901
出版年	2014
卷号	5 期号:2 页码:56-66
中文摘要	通过对新疆伊犁昭苏黄土剖面微量元素和粒度的测定分析,并与黄土高原黄土进行对比,揭示了西风区末次冰期以来黄土微量元素地球化学变化特征,探讨了其古气候意义。分析结果表明,伊犁黄土除Sr和Cr元素出现富集外,其他微量元素含量与黄土高原总体具有较好的相似性,可能表明末次冰期以来伊犁黄土形成环境较黄土高原干旱;伊犁黄土除Sr、Zn、Co和Ni元素含量分布变化比黄土高原稍大外,其他微量元素变化均比黄土高原小的多,可能意味着末次冰期以来伊犁地区环境变化幅度总体较黄土高原小的多。此外,研究结果还表明,伊犁黄土 Zr元素主要赋存在粒径>20 mum的粗颗粒中,暗示着黄土中锆石组分主要赋存于这种粗颗粒组分中;该剖面微量元素在风化成壤过程中,其迁移性由强至弱依次为 Zr>Y>Sr>Cr>V>Ga>Rb>Ni>Cu>Ba>Th>Zn>Co>U,均出现不同程度的富集,富集率均较低且变化幅度较小,可能指示末次冰期以来伊犁黄土沉积环境较为干旱且波动变化较小。
英文摘要	Based on trace elements and grain size analysis of Zhaosu loess from Yili basin in Xinjiang, the authors reveal trace element variation characteristics in the westerly zone since the last glacial period, and discuss its palaeoclimatic significance. The results show that the content of other trace elements with the exception of the enrichment of Sr and Cr elements in the Ili loess have a better consistency with the Chinese Loess Plateau, which may indicate that the environment of the Ili loess formation was more arid than that of the Chinese Loess Plateau since the Last Glacial Period. The changes in distribution of contents of Sr, Zn, Co and Ni elements are slightly larger than that of the Chinese Loess Plateau, and the rest much smaller than it, which suggest that the range of environmental change in the Ili region since the Last Glacial Period was much smaller than the Chinese Loess Plateau. In addition, the results also imply that the Zr element of the Ili loess mainly contained in the coarse grain size >20 mum, which may indicate zircon components of the Ili loess dominatedly enrich in this kind of coarse particle size. In the process of weathering and pedogenesis, the trace elements migration intensity of Ili loess in the order from strong to weak was Zr〉Y>Sr〉Cr〉V〉Ga〉Rb>Ni〉Cu〉Ba>Th〉Zn〉Co〉U,which there exist different degrees of enrichment, and small changes in the lower level of enrichment, suggesting that the environment was more arid and less fluctuating when the Ili loess deoposited.
中文关键词	西风区 ; 伊犁黄土 ; 微量元素 ; 地球化学 ; 古环境
英文关键词	Westerly area Ili loess trace elements geochemistry palaeoenvironment
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:5291640
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/230948
作者单位	1.中国科学院水利部成都山地灾害与环境研究所, 黄土与第四纪地质国家重点实验室;;中国科学院山地灾害与地表过程重点实验室, 成都, 四川 610041, 中国; 2.中国科学院地球环境研究研究所, 黄土与第四纪地质国家重点实验室, 西安, 陕西 710075, 中国
推荐引用方式 GB/T 7714	李传想,宋友桂. 西风区末次冰期以来昭苏黄土剖面微量元素分布特征及其环境意义[J],2014,5(2):56-66.
APA	李传想,&宋友桂.(2014).西风区末次冰期以来昭苏黄土剖面微量元素分布特征及其环境意义.地球环境学报,5(2),56-66.
MLA	李传想,et al."西风区末次冰期以来昭苏黄土剖面微量元素分布特征及其环境意义".地球环境学报 5.2(2014):56-66.