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

Content Provider	Springer Nature Link
Author	Peng, Shuzhen Guo, Zhengtang
Copyright Year	2001
Abstract	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 SiO$_{2}$ and Al$_{2}$O$_{3}$ contents and the SiO$_{2}$/Al$_{2}$O$_{3}$ ratio in different fractions vary regularly with grain size, and that a good linear relation exists between the SiO$_{2}$/Al$_{2}$O$_{3}$ ratio and grain size for the fractions <50 μm. Because Al and Si are among the most stable elements and pedogenic processes in the Loess Plateau cannot affect the SiO$_{2}$/Al$_{2}$O$_{3}$ 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 SiO$_{2}$/Al$_{2}$O$_{3}$ is in good agreement with median grain size (Md) in the loess units. On the contrary, SiO$_{2}$/Al$_{2}$O$_{3}$ has documented a series of fluctuations in the soil units that are not clearly indicated by the grain-size changes of bulk samples.
Starting Page	261
Ending Page	266
Page Count	6
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	44
Issue Number	1
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	2001-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	SiO$_{2}$/Al$_{2}$O$_{3}$ ratio grain size loess-paleosol sequence winter monsoon Geosciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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