干旱区生态环境知识资源中心(Arid): Geochemical characterization of major elements in desert sediments and implications for the Chinese loess source

Arid

	Geochemical characterization of major elements in desert sediments and implications for the Chinese loess source
	Zhao Wancang; Liu Lianwen; Chen Jun; Ji Junfeng
来源期刊	Science China. Earth Sciences
ISSN	1674-7313
出版年	2019
卷号	62 期号:9 页码:1428-1440
英文摘要	Mineral dust released from the desert is one of the important components of atmospheric aerosols.Arid and semi-arid deserts,sandy lands in northern China and their adjacent Gobi Desert lands in northern China and neighboring Mongolia (hereinafter referred to as Gobi) are potential sources of mineral dust in Asia.However,there is currently a lack of systematic studies on the characteristics of major elements in the potential mineral dust source area.This study investigates the major elements of 310 surficial sand samples in the stabilized and semi-stabilized dune fields from 12 deserts/sandy land and Gobi in northern China and southern Mongolian Gobi and compiles published data.We identify four regions with distinct geochemical characteristics:(1) Taklimakan,Kumtag and Qaidam deserts in western China;(2) Badain Jaran,Tengger,Hobq,and Mu Us deserts in the central and western regions of northern China;(3) Hulun Buir,Onqin Daga and Horqin sandy lands in northeast China;and (4) Gobi and Gurbantunggut deserts.The spatial distributions of the SiO_2 and CaO contents in Chinese deserts are highly variable.The average content of SiO_2 generally reflects an increasing trend from west to east,while the average content of CaO shows a decreasing trend from west to east.We demonstrate that the spatial variation of major elements is likely controlled by two key scenarios:the composition of source rocks and the mineral maturity caused by the supply of fresh materials.The SiO_2/(Al_2O_3+K_2O+Na_2O) ratio of desert sediments is relatively lower in western China and may be caused by high ferricmagnesia and high carbonate minerals;this ratio is relatively higher in the northeast sandy lands and may be linked to a lack of fresh material supply and the presence of high K-feldspar minerals in source rocks.The deserts can be further distinguished by ternary diagrams with SiO_2/10-CaO-Al_2O_3,(K_2O+Na_2O)-CaO-Fe_2O_3 and CaO-Na_2O-K_2O.The comparison of major elements between desert sediments and loess suggests that the western and/or central deserts in China may be the potential provenances of loess on the Loess Plateau.
英文关键词	Desert Loess Major elements Eolian Dust Carbonate
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Geology
CSCD记录号	CSCD:6579647
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336176
作者单位	Zhao Wancang, School of Geographical Sciences,Southwest University;;School of Earth Sciences and Engineering,Nanjing University, Chongqing Key Laboratory of Karst Environment;;Ministry of Education Key Laboratory of Surficial Geochemistry, ;;Nanjing, Chongqing;; 400715;;210023.; Liu Lianwen, School of Earth Sciences and Engineering,Nanjing University, Ministry of Education Key Laboratory of Surficial Geochemistry, Nanjing, Jiangsu 210023, China.; Chen Jun, School of Earth Sciences and Engineering,Nanjing University, Ministry of Education Key Laboratory of Surficial Geochemistry, Nanjing, Jiangsu 210023, China.; Ji Junfeng, School of Earth Sciences and Engineering,Nanjing University, Ministry of Education Key Laboratory of Surficial Geochemistry, Nanjing, Jiangsu 210023, China.
推荐引用方式 GB/T 7714	Zhao Wancang,Liu Lianwen,Chen Jun,et al. Geochemical characterization of major elements in desert sediments and implications for the Chinese loess source[J],2019,62(9):1428-1440.
APA	Zhao Wancang,Liu Lianwen,Chen Jun,&Ji Junfeng.(2019).Geochemical characterization of major elements in desert sediments and implications for the Chinese loess source.Science China. Earth Sciences,62(9),1428-1440.
MLA	Zhao Wancang,et al."Geochemical characterization of major elements in desert sediments and implications for the Chinese loess source".Science China. Earth Sciences 62.9(2019):1428-1440.