Geochemical indicator of original eolian grain size and implications on winter monsoon evolution

	Geochemical indicator of original eolian grain size and implications on winter monsoon evolution
	Peng, SZ ; Guo, ZT
刊名	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
	2001-12-01
卷号	44 页码:261-266
关键词	SiO2/Al2O3 ratio grain size loess-paleosol sequence winter monsoon
ISSN号	1006-9313
文献子类	Article
英文摘要	Grain size of eolian deposits from the Loess Plateau in China has been widely used to reconstruct the history of the East Asian winter monsoon. However, the grain size of bulk samples is only partially indicative to the strength of the winter monsoon because post-depositional weathering processes have significantly changed the grain size of original eolian particles. Here, non-weathered loess samples were separated into eight different particle fractions, and major chemical elements were determined in order to establish a geochemical indicator of original eolian grain size. The results show that SiO2 and Al2O3 contents and the SiO2/Al2O3 ratio in different fractions vary regularly with grain size, and that a good linear relation exists between the SiO2/Al2O3 ratio and grain size for the fractions <50 mum. Because Al and Si are among the most stable elements and pedogenic processes in the Loess Plateau cannot affect the SiO2/Al2O3 ratio, this index can be used to reflect the grain size of original eolian particles. Application of this index in the Weinan and Luochuan loess sections of the last climatic cycle shows that SiO2/Al2O3 is in good agreement with median grain size (Md) in the loess units. On the contrary, SiO2/Al2O3 has documented a series of fluctuations in the soil units that are not clearly indicated by the grain-size changes of bulk samples.
WOS关键词	CHINESE LOESS PLATEAU ; STRENGTH
WOS研究方向	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000175181800031
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/77157]
专题	中国科学院地质与地球物理研究所
通讯作者	Guo, ZT
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Taian Teachers Coll, Tai An 271000, Peoples R China
推荐引用方式 GB/T 7714	Peng, SZ,Guo, ZT. Geochemical indicator of original eolian grain size and implications on winter monsoon evolution[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2001,44:261-266.
APA	Peng, SZ,&Guo, ZT.(2001).Geochemical indicator of original eolian grain size and implications on winter monsoon evolution.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,44,261-266.
MLA	Peng, SZ,et al."Geochemical indicator of original eolian grain size and implications on winter monsoon evolution".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 44(2001):261-266.