Distribution and composition of loess sediments in the Ili Basin, Central Asia

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地表生过程与生态调控重点实验室

	Distribution and composition of loess sediments in the Ili Basin, Central Asia
	Song, Yougui 1; Chen, Xiuling 2; Qian, Linbo 1,3; Li, Chuanxiang 1,4,5; Li, Yun 1; Li, Xinxin 1; Chang, Hong 1; An, Zhisheng 1
刊名	QUATERNARY INTERNATIONAL
	2014-06-17
卷号	334-335 页码:61-73
关键词	CHEMICAL-WEATHERING INTENSITY LATE QUATERNARY LOESS CHINESE LOESS RED-CLAY PALEOCLIMATIC IMPLICATIONS SOUTHERN TAJIKISTAN TIANSHAN MOUNTAINS PALEOSOL SEQUENCE WESTERN TIANSHAN TASHKENT REGION
ISSN号	1040-6182
通讯作者	Song, Yougui
英文摘要	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. (C) 2014 Elsevier Ltd and INQUA. All rights reserved.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Geography, Physical ; Geosciences, Multidisciplinary
研究领域[WOS]	Physical Geography ; Geology
关键词[WOS]	CHEMICAL-WEATHERING INTENSITY ; LATE QUATERNARY LOESS ; CHINESE LOESS ; RED-CLAY ; PALEOCLIMATIC IMPLICATIONS ; SOUTHERN TAJIKISTAN ; TIANSHAN MOUNTAINS ; PALEOSOL SEQUENCE ; WESTERN TIANSHAN ; TASHKENT REGION
收录类别	SCI
语种	英语
WOS记录号	WOS:000338817800008
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/9975]
专题	成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
作者单位	1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Shaanxi, Peoples R China 2.Fujian Normal Univ, Sch Geog Sci, State Key Lab Breeding Base Humid Subtrop Mt Ecol, Fuzhou 350007, Peoples R China 3.S China Normal Univ, Sch Geog, Guangzhou 510631, Guangdong, Peoples R China 4.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China 5.Minist Water Conservancy & Power, Chengdu 610041, Peoples R China
推荐引用方式 GB/T 7714	Song, Yougui,Chen, Xiuling,Qian, Linbo,et al. Distribution and composition of loess sediments in the Ili Basin, Central Asia[J]. QUATERNARY INTERNATIONAL,2014,334-335:61-73.
APA	Song, Yougui.,Chen, Xiuling.,Qian, Linbo.,Li, Chuanxiang.,Li, Yun.,...&An, Zhisheng.(2014).Distribution and composition of loess sediments in the Ili Basin, Central Asia.QUATERNARY INTERNATIONAL,334-335,61-73.
MLA	Song, Yougui,et al."Distribution and composition of loess sediments in the Ili Basin, Central Asia".QUATERNARY INTERNATIONAL 334-335(2014):61-73.