新疆伊犁盆地昭苏黄土剖面稀土元素特征

干旱区研究 ›› 2013, Vol. 30 ›› Issue (6): 1004-1012.

新疆伊犁盆地昭苏黄土剖面稀土元素特征

郭利成^1,3,4，陈秀玲^1,2，宋友桂²，贾丽敏¹

（1. 福建省湿润亚热带山地生态省部共建国家重点实验室培育基地，福建师范大学地理科学学院，福建福州 350007；2. 中国科学院地球环境研究所黄土与第四纪地质国家重点实验室，陕西西安 710075； 3. 中国科学院地质与地球物理研究所新生代地质与环境重点实验室，北京 100029; 4. 中国科学院大学，北京 100049）

收稿日期:2012-09-13 修回日期:2013-05-07 出版日期:2013-11-15 发布日期:2013-12-12
作者简介:郭利成（1988-），男，在读硕士，主要从事第四纪地质环境研究. E-mail： guolicheng05@126.com
基金资助:
黄土与第四纪地质国家重点实验室开放基金（SKLLQG1103，SKLLQG1113）；国家自然科学基金项目（41172166）

Characteristics of Rare Earth Elements in Loess Profiles in the Ili Basin, Xinjiang

GUO Li-cheng^1,3,4，CHEN Xiu-ling^1,2，SONG You-gui²，JIA Li-min¹

(1. Fujian Province Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, College of Geographical Sciences, Fujian Normal University, Fuzhou 350007,Fujian,China；2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi[JP8]’a[JP]n 710075,Shaanxi, China；3. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 4. University of Chinese Academy of Science, Beijing 100049, China)

Received:2012-09-13 Revised:2013-05-07 Published:2013-11-15 Online:2013-12-12

摘要/Abstract

摘要： 对晚更新世以来，伊犁地区与典型黄土高原地区黄土的稀土元素（REE）特征差异研究表明，伊犁盆地黄土剖面的REE特征不仅在含量上与典型黄土区的相似，分馏特征也基本相似，呈斜“L”型的分布模式，均发生轻、重稀土分异，分布曲线为负斜线，表现出中度的Eu负异常，Ce异常不明显，意味着晚更新世以来，不同地区黄土的物质来源具有一定的相似性。研究还发现，伊犁地区与黄土高原地区的稀土元素特征存在细微差异，昭苏黄土平均的稀土元素总量略高于昭苏古土壤平均值，与典型黄土区不同，这可能是由伊犁地区粉尘来源及其沉积环境的差异所致，且晚更新世以来不同区域黄土剖面REE特征参数三角图解也证实了这点。

关键词: 晚更新世, 黄土剖面, 稀土元素, 黄土高原, 伊犁盆地, 新疆

Abstract: Studies on the relations between the Asian aridification and the climate fluctuation in the northern hemisphere and the reconstruction of palaeoenvironment in arid region in north China have attracted extensive global attention in recent years, and more effective means are needed to be applied to reveal the specific mechanisms of them. As we all known, rare earth elements (REE) with similar chemical properties and little changes during weathering transportation and diagenesis are widely used as the trace elements in studying the provenances of various sediments. REE characteristics are closely related to environmental change, so that REE can record the environment evolution in detail. Consequently, REE are widely used as the important indicators in studying paleoclimate. However, few studies on the characteristics and environmental significance of REE in loess in northwest inland area of China were carried out. The characteristics of rare earth elements in loess profiles in the Ili Basin and those in typical loess areas since the Epipleistocene were analyzed and compared. The results revealed that the average content of REE in loess profiles in the Ili Basin was similar to that in the typical loess profiles, and the REE distribution was in an inclined “Lshaped” pattern. The main fractional characteristics were similar and characterized by LREEenrichment and HREEdepletion, the distribution curves were negative oblique lines, and Eu performed a negative anomaly, but the anomaly of Ce was not obvious. Therefore, these loess profiles had the common characteristics, and loess was possibly originated from same sources. However, there were a few differences of the characteristics of REE in the loess profiles in different areas since the Epipleistocene, which was related to the existence of proximal sources of loess profiles in the Ili Basin, different sedimentation environment, and instability of upper air circulation.

Key words: Epipleistocene, loess profile, rare earth element, the Loess Plateau, Ili Basin, Xinjiang

郭利成, 陈秀玲, 宋友桂, 贾丽敏. 新疆伊犁盆地昭苏黄土剖面稀土元素特征[J]. 干旱区研究, 2013, 30(6): 1004-1012.

GUO Li-Cheng, CHEN Xiu-Ling, SONG You-Gui, JIA Li-Min. Characteristics of Rare Earth Elements in Loess Profiles in the Ili Basin, Xinjiang[J]. , 2013, 30(6): 1004-1012.

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