| 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 |
| 引用统计 | |
| 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) |
| 推荐引用方式 GB/T 7714 | 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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