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Distribution and composition of loess sediments in the Ili Basin, Central Asia
Song, YG (Song, Yougui)[ 1 ]; Chen, XL (Chen, Xiuling)[ 2 ]; Qian, LB (Qian, Linbo)[ 1,3 ]; Li, CX (Li, Chuanxiang)[ 1,4,5 ]; Li, Y (Li, Yun)[ 1 ]; Li, XX (Li, Xinxin)[ 1 ]; Chang, H (Chang, Hong)[ 1 ]; An, ZS (An, Zhisheng)[ 1 ]
2014-06-17
Source PublicationQUATERNARY INTERNATIONAL
Volume334Pages:61-73
Subtype期刊论文
Abstract

Loess deposits in Central Asia provide an important record of regional climate and environmental change. However, in contrast to the intensively investigated loess deposits on the Chinese Loess Plateau (CLP), loess sediments in the Ili Basin of eastern Central Asia are poorly understood. Based on field investigation and existing literature, this paper presents a preliminary study of the distribution, strata and composition of the Ili loess. The distribution of the Ili loess is clearly controlled by topographic and geomorphic conditions, mainly in the river terraces, low uplands, and slopes of the Tianshan Mountains. The thickness of the loess varies from several meters to over two hundred meters. To characterize the Ili loess composition, the authors analyzed its grain size, geochemistry, X-ray diffraction pattern and heavy mineral assemblage. Grain size analyses reveal that the Ili loess consists predominantly of silt (4-63 mu m) with a minor proportion of sand, which is coarser than the loess of the CLP and suggests a nearby provenance. The bulk mineral components of the Ili loess are dominated by quartz and feldspar with minor amounts of calcite, chlorite, mica, dolomite and hornblende. More than 20 types of heavy minerals were observed with major components of amphibole, magnetite and epidote. The major elements of the Ili loess are characterized by high abundance of SiO2, Al2O3 and CaO and minor amounts of Fe2O3, MgO, Na2O and K2O. Compared to the CLP loess, the Ili loess is relatively rich in Na2O and displays higher Na2O/Al2O3 ratios, suggesting weak weathering. The distribution patterns of REEs indicate that both the Ili loess and CLP loess are of typical upper crustal composition, with enrichment in LREE, negative Eu anomalies, and depletion of HREE. Both the heavy mineral assemblage and geochemistry indicate that the local bedrock of the Ili Basin may have contributed only a little to the loess sediments.

DOI10.1016/j.quaint.2013.12.053
Indexed BySCI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9782
Collection古环境研究室
Corresponding AuthorSong, YG (Song, Yougui)[ 1 ]
Affiliation1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, No 10 Fenghui Nan Road,Xi’An, Shaanxi 710075, China;
2.State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology, School of Geographical Sciences, Fujian Normal University,Fuzhou 350007, China;
3.School of Geography, South China Normal University, Guangzhou 510631, China;
4.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences & Ministry of Water Conservancy, Chengdu 610041, China
Recommended Citation
GB/T 7714
Song, YG ,Chen, XL ,Qian, LB ,et al. Distribution and composition of loess sediments in the Ili Basin, Central Asia[J]. QUATERNARY INTERNATIONAL,2014,334:61-73.
APA Song, YG .,Chen, XL .,Qian, LB .,Li, CX .,Li, Y .,...&An, ZS .(2014).Distribution and composition of loess sediments in the Ili Basin, Central Asia.QUATERNARY INTERNATIONAL,334,61-73.
MLA Song, YG ,et al."Distribution and composition of loess sediments in the Ili Basin, Central Asia".QUATERNARY INTERNATIONAL 334(2014):61-73.
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