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Remanence Characteristics of Different Magnetic Grain Size Categories at Xifeng, Central Chinese Loess Plateau

Published online by Cambridge University Press:  20 January 2017

Xiuming Liu ,
Tim Rolph ,
Jan Bloemendal ,
John Shaw  and
Tungsheng Liu
Xiuming Liu
Affiliation:
Department of Geography, University of Liverpool, Liverpool L69 3BX, UK
Tim Rolph
Affiliation:
Geomagnetism Laboratory, University of Liverpool, Liverpool L69 3BX, UK
Jan Bloemendal
Affiliation:
Department of Geography, University of Liverpool, Liverpool L69 3BX, UK
John Shaw
Affiliation:
Geomagnetism Laboratory, University of Liverpool, Liverpool L69 3BX, UK
Tungsheng Liu
Affiliation:
Institute of Geology, Chinese Academy of Sciences, P.O. Box 634, Beijing 100029, China
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Abstract

Utilizing the thermal unblocking of low-temperature remanent magnetization in superparamagnetic (SP) ferrimagnets and the low-temperature demagnetization of multidomain (MD) magnetite remanences, the relative proportions of SP, MD, and singledomain (SD and SD-like) ferrimagnets are estimated in the topmost part of a loess section at Xifeng, China, which covers about the past 130,000 yr. SP ferrimagnets are commonly regarded as pedogenic (authigenic) products while the MD component is believed to have a detrital origin. These measurements, therefore, provide new data which improve our understanding of the characteristics and distribution of the different magnetic grain-size fractions present in loess and soils. In particular, our measurements indicate a larger MD fraction in soil than in loess, a result which indicates that although enhancement of the SP ferrimagnet fraction dominates the increased low-field magnetic susceptibility of paleosols, an enhancement of the MD fraction, probably through leaching, also plays an important role during pedogenesis.

Type
Research Article
Information
Quaternary Research , Volume 42 , Issue 2 , September 1994 , pp. 162 - 165
Copyright
University of Washington

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