Physics
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3122603l&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 22, CiteID L22603
Physics
9
Geomagnetism And Paleomagnetism: Environmental Magnetism, Geomagnetism And Paleomagnetism: Magnetic Mineralogy And Petrology, Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism
Scientific paper
Variations in magnetic parameters of the long Chinese loess/paleosol sequences reflect paleoclimatic fluctuations. However, there remain ambiguities whether the magnetic proxies are controlled by the concentration or by the distribution of magnetic grain sizes. We systematically investigated the frequency-dependence of low-field magnetic susceptibility (χfd%) and the decay-rate (DR) dependence of anhysteretic remanence magnetization (ARM) susceptibility (χARM,DR%) for a set of representative loess/paleosol samples from the Yuanbao section, western Chinese loess plateau. After removing the effect of aeolian coarse-grained magnetites, both χfd% and χARM,DR% are nearly independent of the degree of pedogenesis, indicating a presence of fine-grained magnetic particles ranging from superparamagnetic to single domain with an almost constant grain size distribution. Therefore, the magnetic enhancement of magnetic susceptibility or ARM is caused dominantly by changes in the concentration of these fine-grained pedogenic grains.
Chen Fangpei
Deng Chenglong
Jackson Michael J.
Liu Qingsong
Yu Yongjae
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