Paleoclimatic significance of mineral magnetic properties of loess sediments in northeastern Qinghai-Tibetan Plateau
X. Y. Wang; H. Y. Lu; Zhen Li; C. L. Deng; H. B. Tan; Y. G. Song
2003
发表期刊Chinese Science Bulletin
卷号48期号:19页码:2126-2133
摘要Loess deposit in the northeastern Qinghai-Tibetan Plateau offers an excellent record of climate and environment changes in this region. We have conducted multiparameter mineral magnetic analyses of samples of loess deposits from the Dongchuan, Lalakou and Panzishan sections.The methods used include magnetic susceptibility, frequency-dependent susceptibility, temperature-dependent susceptibility, isothermal remanent magnetization acquisition,and magnetic hysteresis loops. The results reveal that magnetite is the dominant contributor to magnetic susceptibility.
Maghemite and hematite is also present in the loess layers
and paleosol horizons. The higher concentration of
maghemite in paleosols suggests that the formation of
maghemite occurred during in situ pedogenesis, which plays
an important role in the enhancement of the magnetic susceptibility.
Similar to that in the Chinese Loess Plateau lying
to the east of the Liupan Mountains, magnetic granulometry
in the studied loess and paleosols is predominantly pseudosingle-
domain (PSD). However, the mean grain-size of the
ferrimagnetic minerals in loess is evidently coarser (larger
PSD and multidomain-like) than in paleosols (mainly PSD).
The magnetic susceptibility of loess and paleosols is positively
correlated with the content of ultrafine magnetite/maghemite
grains, and hence with the intensity of in situ pedogenesis.
Therefore, the enhanced magnetic susceptibility in the studied
loess-paleosol sequences can be interpreted as being due
to climatically induced in situ pedogenesis.
关键词Mineral Magnetism Loess-paleosol Qinghai-tibetan Plateau Magnetic Susceptibility
学科领域地质学
收录类别SCI
语种英语
WOS记录号WOS:000186305300019
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文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/2547
专题黄土与第四纪地质国家重点实验室(2005-2009)
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X. Y. Wang,H. Y. Lu,Zhen Li,et al. Paleoclimatic significance of mineral magnetic properties of loess sediments in northeastern Qinghai-Tibetan Plateau[J]. Chinese Science Bulletin,2003,48(19):2126-2133.
APA X. Y. Wang,H. Y. Lu,Zhen Li,C. L. Deng,H. B. Tan,&Y. G. Song.(2003).Paleoclimatic significance of mineral magnetic properties of loess sediments in northeastern Qinghai-Tibetan Plateau.Chinese Science Bulletin,48(19),2126-2133.
MLA X. Y. Wang,et al."Paleoclimatic significance of mineral magnetic properties of loess sediments in northeastern Qinghai-Tibetan Plateau".Chinese Science Bulletin 48.19(2003):2126-2133.
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