Magnetic susceptibility of Holocene loess-black loam sequence from Jiaodao, Shaanxi before and after citrate-bicarbonate-dithionite extraction

	Magnetic susceptibility of Holocene loess-black loam sequence from Jiaodao, Shaanxi before and after citrate-bicarbonate-dithionite extraction
	Deng, CL ; Yuan, BY ; Zhu, RX ; Versoub, KL ; Singer, MJ ; Vidic, NJ
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2000-07-01
卷号	43 期号:4 页码:505-514
关键词	CBD extraction rock magnetism magnetic susceptibility thermomagnetic analysis Holocene loess-black loam sequence
ISSN号	0001-5733
文献子类	Article
英文摘要	Magnetic susceptibility, anhysteretic susceptibility, frequency-dependent and temperature-dependent magnetic susceptibilities are measured before and after citrate-bicarbonate -dithionite (CBD) treatment on the Holocene loess-black loam sequence from Jiaodao, Shaanxi province. In this paper, we employ the correlativity between anhysteretic and magnetic susceptibilities to determine the domain state of magnetic minerals of the studied profile. The differences between pre- and post-CBD susceptibilities imply that not only the ultrafine superparamagnetic, but also some larger single-domain grains can be produced due to pedogenesis. Thermomagnetic analyses of the typical Holocene loess and black-loam specimens and magnetic susceptibility measurements before and after CBD treatment show that CBD has no absolute selectivity of dissolving the pedogenic magnetite grains, although it can efficiently dissolve the pedogenic maghemite grains. The results also show that CBD technique strongly supports the pedogenic model of susceptibility enhancement. In addition, a combination study of soil chemistry and rock magnetism supplies a new evidence for the eolian origin of Chinese loess.
WOS关键词	CHINESE LOESS ; PALEOSOL SEQUENCES ; RECORD ; PLATEAU ; PALEOCLIMATE ; PEDOGENESIS
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000088538700010
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/76417]
专题	中国科学院地质与地球物理研究所
通讯作者	Deng, CL
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Univ Calif Davis, Dept Geol, Davis, CA 95616 USA 3.Univ Calif Davis, Dept Land Air & Water Resources, Davis, CA 95616 USA
推荐引用方式 GB/T 7714	Deng, CL,Yuan, BY,Zhu, RX,et al. Magnetic susceptibility of Holocene loess-black loam sequence from Jiaodao, Shaanxi before and after citrate-bicarbonate-dithionite extraction[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2000,43(4):505-514.
APA	Deng, CL,Yuan, BY,Zhu, RX,Versoub, KL,Singer, MJ,&Vidic, NJ.(2000).Magnetic susceptibility of Holocene loess-black loam sequence from Jiaodao, Shaanxi before and after citrate-bicarbonate-dithionite extraction.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,43(4),505-514.
MLA	Deng, CL,et al."Magnetic susceptibility of Holocene loess-black loam sequence from Jiaodao, Shaanxi before and after citrate-bicarbonate-dithionite extraction".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 43.4(2000):505-514.