Knowledge Resource Center for Ecological Environment in Arid Area
| 项目编号 | 41402147 |
| 中国黄土-古土壤剩磁获取机制的实验研究 | |
| 王荣华 | |
| 主持机构 | 兰州大学 |
| 开始日期 | 2015 |
| 结束日期 | 2017 |
| 资助经费 | 270000(CNY) |
| 项目类别 | 青年科学基金项目 |
| 资助机构 | CN-NSFC（国家自然科学基金） |
| 语种 | 中文 |
| 国家 | 中国 |
| 英文简介 | The study of magnetization mechanisms in loess-paleosol is a key aspect in the paleomagnetic studies of Chinese loess-paleosol. It is also an important pathway to solve current debates about the reliability and accuracy of loess magnetization. Moreover, the lock-in depth of loess magnetization is directly related to the correlations between the oceanic and terrestrial paleoclimatic records during the Quaternary. In this project, loess-paleosol of different ages from three classic sections (Lanzhou, Xifeng and Luochuan) will be collected, and through redeposition and remagnetization experiments magnetization mechanisms in loess-paleosol will be studied. In the redeposition experiment, loose loess particles are deposited in Helmholtz-coils under a varying magnetic field simulating geomagnetic field reversal and excursion. Remanent magnetization of redeposited loess obtained in different polarities will be studied and analyzed in details, aiming to understand how loess magnetization records respond to the magnetic field changes, and to determine the lock-in depth of pDRM. Remagnetization experiment will combine two ways adopted in the preliminary studies, turning- burring loess blocks in-situ for a certain time or heating-cooling (from -4℃to 25℃) loess blocks in a reversed field generated by Helmholtz-coils. Loess L1 was found to be partially remagnetized after buried in-situ under a simulated reverse field for a short time about 1 year. By continuing this remagnetization experiment on loess-paleosol with different ages, we are going to investigate whether this partial remagnetization will continue with increasing experimenting time, whether it is common the Chinese Loess Plateau and mechanism of a pDRM obtained in air it suggested. Experiments will also be tried to find out other possible remagnetization mechanisms in loess-paleosol. By studying remanent magnetization with known-direction components obtained during redeposition and remagnetization experiments, how secondary components overprint primary components will be revealed. |
| 来源机构 | 兰州大学 |
| 资源类型 | 项目 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/346839 |
| 推荐引用方式 GB/T 7714 | 王荣华.中国黄土-古土壤剩磁获取机制的实验研究.2015. |
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