Rock magnetic properties of the fluvio-lacustrine sediments from the Dachangliang section in the Nihewan Basin, northern China
文献类型：期刊论文
| 作者 | Hong, A. O.1,2 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2008-07-01 |
| 卷号 | 51期号:4页码:1029-1039 |
| 关键词 | Nihewan Basin Dachangliang section rock magnetism environmental magnetism thermomagnetic analysis X-ray diffraction |
| ISSN号 | 0001-5733 |
| 英文摘要 | The fluvio-lacustrine sequence of the Nihewan Basin in northern China consists mainly of alternating grayish-green silts and grayish-yellow Silts/fine-grained-sands. A multi-parameter investigation was conducted on the two types of representative sedimentary facies from the Dachangliang section in the eastern Nihewan Basin, using environmental magnetic approaches coupled with X-ray diffraction analysis. The magnetic mineralogy, magnetic grain size and thermal-magnetic characteristics of the two types of sediments were determined. The grayish-green silts have a magnetic mixture of magnetite and hematite, characterized by weak magnetism and relatively smaller magnetic particles. The grayish-yellow silts/fine-grained-sands have a magnetic mixture of magnetite and maghemite, characterized by strong magnetism and relatively coarser magnetic particles. The clay mineralogy of the two sediments is dominated by chlorite and illite. Chlorite in both types of sediments decomposes after 700 degrees C thermal treatment in an argon atmosphere, providing iron source for the neoformation of fine-grained (superparamagnetic/single-domain) magnetite, leading to increasing magnetic susceptibility. Thus, the thermally-induced rock magnetic characteristics (in particular magnetic susceptibility) may be used to determine the relative contents of chlorite in the Nihewan sediments, which probably further signal the variations of chemical weathering intensity in this basin. In addition, the grayish-green silts generally have higher contents of chlorite and more enhanced magnetic susceptibility after heating than the grayish-yellow silts/fine-grained sands, implying that the former sediments were possibly deposited in an environment of weaker in situ chemical weathering. |
| 语种 | 英语 |
| WOS记录号 | WOS:000258061300011 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/69130]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Hong, A. O. |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Paleomagnetism & Geochronol Lab SKL LE, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hong, A. O.. Rock magnetic properties of the fluvio-lacustrine sediments from the Dachangliang section in the Nihewan Basin, northern China[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2008,51(4):1029-1039. |
| APA | Hong, A. O..(2008).Rock magnetic properties of the fluvio-lacustrine sediments from the Dachangliang section in the Nihewan Basin, northern China.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,51(4),1029-1039. |
| MLA | Hong, A. O.."Rock magnetic properties of the fluvio-lacustrine sediments from the Dachangliang section in the Nihewan Basin, northern China".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 51.4(2008):1029-1039. |
入库方式： OAI收割
来源：地质与地球物理研究所
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