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Rock magnetism of loess sediments in northwestern margin of Chinese Loess Plateau since the late last glaciation
Sun, YF (Sun,Yufang)[1,2]; Qiang, XK (Qiang,Xiaoke)[1]; Xu, XW (Xu,Xinwen)[1,2]; Li, XB (Li,Xubin)[1,2]; Li, P (Li,Peng)[1,2]; Zhao, H (Zhao,Hui)[1,2]
2011-05-30
发表期刊CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
卷号54期号:5页码:1310-1318
文章类型期刊论文
摘要We have carried out a detailed rock magnetic investigation on the loess-paleosol sequences in the Jingyuan and Gulang sites, northwestern margin of Chinese Loess Plateau, including low-field magnetic susceptibility (chi) frequency-dependent susceptibility (chi(fd)%) temperature-dependent susceptibility (chi-T), isothermal remanent magnetization (IRM) and hysteresis loop. The results demonstrate that the total amount of magnetic minerals in Jingyuan and Gulang loess-paleosol sequences is relatively low, and the main magnetic mineral in paleosol and loess is magnetite, where there are maghemite and hematite as well. The maghemite content in paleosol is more than that in loess. Superparamagnetic (SP) and stable single domain (SSD) ferrimagnetic grains are generated in the process of pedogenesis. Cross plots of M(rs)/M(s) vs. B(cr)/B(c) indicate that the mean magnetic grain size in loess and paleosol are pseudo-single domain (PSD). But, the mean diameter of magnetite in loess is slightly larger than that in paleosol, and closer to the range of multi-domain (MD). It results from the fact that less fine-grained magnetite are generated in loess than in paleosol, for there are coarser magnetic particles transported from the source area of eolian to loess layer than to paleosol layer. Although the major factor leading to high susceptibility in S0 is the climate, the effect of coarse magnetic particles from dust source can not be ignored.
DOI10.3969/j.issn.0001-5733.2011.05.020
收录类别SCI
语种英语
引用统计
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/10266
专题古环境研究室
推荐引用方式
GB/T 7714
Sun, YF ,Qiang, XK ,Xu, XW ,et al. Rock magnetism of loess sediments in northwestern margin of Chinese Loess Plateau since the late last glaciation[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2011,54(5):1310-1318.
APA Sun, YF ,Qiang, XK ,Xu, XW ,Li, XB ,Li, P ,&Zhao, H .(2011).Rock magnetism of loess sediments in northwestern margin of Chinese Loess Plateau since the late last glaciation.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,54(5),1310-1318.
MLA Sun, YF ,et al."Rock magnetism of loess sediments in northwestern margin of Chinese Loess Plateau since the late last glaciation".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 54.5(2011):1310-1318.
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