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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (1): 231-238    DOI: 10.7522/j.issn.1000-694X.2013.00032
Weather and Climate     
Comparison of the Magnetic and Grain Size Properties between the Sand-storm Samples from Lanzhou and Sydney
MA Ming-ming1, LIU Xiu-ming2,3, LI Ping-yuan1, L Bin1, FENG Hua1, LEI Pei-wen2
1.Ministry of Education Key Laboratory of West Chinas Environmental Systems/Research School of Arid Environment & Climate Change, Lanzhou University, Lanzhou 730000, China;
2.School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China;
3.Department of Environment and Geography, Macquarie University, Sydney 2109, Australia
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Abstract  

Measurements of magnetic properties and particle size were carried out for sand-storm samples collected in Sydney on September 23, 2009 and in Lanzhou in April 2010. The results showed that the magnetic content of Lanzhou sample was much higher than that of Sydney sample. Both samples differed slightly in mineralogy. Lanzhou sample contained maghemite, hematite and possibly hematite. Besides these minerals, Sydney sample likely contained goethite. The magnetic grain size of Sydney sample was finer than that of Lanzhou sample. As to particle-size distribution, Sydney sample showed a wide and flat curve with four peaks, while Lanzhou sample displayed a narrow curve with three peaks. The great difference in magnetic properties between storm samples and source samples and the multi-peak particle-size distribution curves were all indicative of multisource storms. Furthermore, a comparison of particle size between Lanzhou storm sample and Jiuzhoutai loess samples was made. The results showed that the increase of 1-10 μm component and the decrease of 10-20 μm component were caused by the physical and chemical weathering of unstable minerals, while the increase of 0.02-1 μm component was mainly contributed to the formation of new minerals and the weathering of unstable minerals. The certain similarity of particle size distribution curves between Lanzhou sand-storm sample and loess-paloesol sample, implied a linkage between modern storm events and geological eolian activities.

Key words:  Sydney      Lanzhou      sand storm      particle size      magnetic properties      source of dust     
Received:  25 August 2012      Published:  20 January 2013
ZTFLH:  P445.4  

Cite this article: 

MA Ming-ming1, LIU Xiu-ming2,3, LI Ping-yuan1, L Bin1, FENG Hua1, LEI Pei-wen2. Comparison of the Magnetic and Grain Size Properties between the Sand-storm Samples from Lanzhou and Sydney. JOURNAL OF DESERT RESEARCH, 2013, 33(1): 231-238.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00032     OR     http://www.desert.ac.cn/EN/Y2013/V33/I1/231

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