New insights into the palaeoclimatic interpretation of the temperature dependence of the magnetic susceptibility and magnetization of Mid-Late Pleistocene loess/palaeosols in Central Asia and the Chinese Loess Plateau
文献类型：期刊论文
| 作者 | Zan, JB (Zan, Jinbo)1,2; Fang, XM (Fang, Xiaomin)2; Yan, MD (Yan, Maodu)2; Li, BS (Li, Bingshuai)2; Zan, JB |
| 刊名 | GEOPHYSICAL JOURNAL INTERNATIONAL
 |
| 出版日期 | 2017 |
| 卷号 | 208期号:2页码:663-673 |
| 关键词 | SIZE DISTRIBUTION DEPOSITS PEDOGENESIS MAGHEMITE SEQUENCE ORIGIN |
| DOI | 10.1093/gji/ggw419 |
| 文献子类 | Article |
| 英文摘要 | The temperature dependence of magnetic susceptibility (chi-T curves) and magnetization (M-T curves) has been used as a routine rock magnetic tool to characterize the magnetic mineralogy and magnetic granulometry of Chinese loess/palaeosols. However, palaeoclimatic interpretation of these thermomagnetic analyses remains controversial. In the present study, total organic carbon (TOC), thermomagnetic and low-temperature magnetic experiments on Mid-Late Pleistocene loess/palaeosols in Central Asia and the Chinese Loess Plateau (CLP) have been conducted. We found that the M (T) cooling curves at room temperature were mostly lower than the corresponding heating curves, whereas for the chi(T) analyses the cooling curves at room temperature were always much higher than the heating curves. Low-temperature magnetic measurements demonstrated that a large amount of superparamagnetic ferrimagnetic particles were produced during the thermal treatment and resulted in the aforementioned differences. This finding further indicated that the use of the M-T curves to estimate the relative content of maghemite in the loess/palaeosols from the CLP was problematic. In addition, a positive correlation exists between the TOC and the frequency-dependent susceptibility (chi(FD)) in the CLP, suggesting that stronger pedogenesis would result in the simultaneous increase in the content of both maghemite and organic matter. Consequently, the parameters Delta chi(1) (representing the relative content of pedogenic maghemite), Delta chi(2) (inverted left perpendicular chi(ph) - chi- inverted right perpendicular] + Delta chi(1)) and chi(ph) (related to the organic matter concentration), which can be calculated from the chi-T analyses, can potentially be used as new indicators of pedogenesis and palaeoclimate in Central Asia and the CLP. |
| 学科主题 | 地质学 |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000396817600005 |
| 源URL | [http://ir.itpcas.ac.cn/handle/131C11/8222]  |
| 专题 | 青藏高原研究所_图书馆 |
| 通讯作者 | Zan, JB |
| 作者单位 | 1.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China. 2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Zan, JB ,Fang, XM ,Yan, MD ,et al. New insights into the palaeoclimatic interpretation of the temperature dependence of the magnetic susceptibility and magnetization of Mid-Late Pleistocene loess/palaeosols in Central Asia and the Chinese Loess Plateau[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2017,208(2):663-673. |
| APA | Zan, JB ,Fang, XM ,Yan, MD ,Li, BS ,&Zan, JB.(2017).New insights into the palaeoclimatic interpretation of the temperature dependence of the magnetic susceptibility and magnetization of Mid-Late Pleistocene loess/palaeosols in Central Asia and the Chinese Loess Plateau.GEOPHYSICAL JOURNAL INTERNATIONAL,208(2),663-673. |
| MLA | Zan, JB ,et al."New insights into the palaeoclimatic interpretation of the temperature dependence of the magnetic susceptibility and magnetization of Mid-Late Pleistocene loess/palaeosols in Central Asia and the Chinese Loess Plateau".GEOPHYSICAL JOURNAL INTERNATIONAL 208.2(2017):663-673. |
入库方式： OAI收割
来源：青藏高原研究所
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