Magnetic Susceptibility and Its Environmental Significance of Lake Sediments
详细信息
- 责任者：Tian Qingchun (Key Laboratory of West China’s Environmental Systems ; Ministry of Education ; College of Resources and Environment ; Lanzhou University ; Lanzhou 730000 ; China) ; Yang Taibao
- 刊名：Acta Sedimentologica Sinica
- 出版年：2011
- 卷期：29(1)
- 关键词：磁化率 ; magnetic susceptibility ; 湖泊沉积物 ; lake sediments ; 青藏高原 ; Qinghai-Tibetan Plateau
- 页码：p.143-150
- 图表：3 illus., 1 table, 34 refs.
- 分类号：0803
- issnNo：ISSN1000-0550
- isbnNo：CN62-1038/P
摘要
A 106 m long sediment core named BDQ0608 was drilled from the Hohxil area in hinterland of the Tibetan Plateau, and the lithology is mostly reseda lake sediments with part of a thin oxide color layer. The thermal demagnetization indicates that magnetic mineral in BDQ0608 core mainly includes magnetite, maghemite, goethite, melnikovite, and trace hematite. The good positive correlation between color reflectance a* values and the changes in magnetic susceptibility curve showed that the varieties of them were subjected to the same environmental factors. Nevertheless, the fluctuation of magnetic susceptibility is not in line with other proxies, and influenced by ambient environment condition during the period of sediment formation. Although as an environmental proxy magnetic susceptibility can reflect environmental changes well, the authors combine with other high accurate environmental proxies to improve the accuracy of paleoenvironmental reconstruction.