| 泥河湾盆地沉积物粒度组分与磁化率变化相关性研究 |
| |
| 引用本文： | 杨小强,李华梅.泥河湾盆地沉积物粒度组分与磁化率变化相关性研究[J].沉积学报,2002,20(4):675-679. |
| |
| 作者姓名： | 杨小强 李华梅 |
| |
| 作者单位： | 1 中山大学地球科学系,广州,510275; |
| |
| 基金项目： | 国家自然科学基金，40104002;49772139， |
| |
| 摘 要： | 以泥河湾盆地郝家台剖面为例,分析沉积物粒级组分与磁化率大小变化的相关性。从厚约 12 2m的剖面选取 80 0多个样品,分别测试从 0.2～ 5 0 0 μm各个粒度区间颗粒的百分含量和质量磁化率。通过计算它们之间的相关关系,认为湖相沉积物磁化率的变化与 0.2～ 35 μm间细粒物质的含量,特别是与 0.2～ 7.5 μm区间悬浮物质的含量反相关,而与 35～ 5 0 0 μm间较粗粒物质的含量正相关。这种相关性与顶部的黄土堆积刚好相反,反映了二者之间磁化率不同的变化机制。据此可认为以外源碎屑输入为主的湖泊中,沉积物磁化率的变化主要受控于外源铁磁性矿物,它反映了湖水面的升降,蕴涵着一定的古气候信息。
|
| 关 键 词： | 郝家台剖面 沉积物粒级组分 磁化率 |
| 文章编号： | 1000-0550(2002)04-0675-05 |
| 收稿时间： | 2001-06-25 |
| 修稿时间： | 2001年6月25日 |
The Correlation between the Content of the Different Grain Size and Magnetic Susceptibility in Lacustrine Sediments, Nihewan Basin |
| |
| YANG Xiao qiang , LI Hua mei.The Correlation between the Content of the Different Grain Size and Magnetic Susceptibility in Lacustrine Sediments, Nihewan Basin[J].Acta Sedimentologica Sinica,2002,20(4):675-679. |
| |
| Authors: | YANG Xiao qiang LI Hua mei |
| |
| Institution: | 1 Department of Earth Sciences, Sun Yat Sen University, Guangzhou 510275;2 Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640 |
| |
| Abstract: | The different grain size content range from 0. 2～ 500 μ m and magnetic susceptiblity were measured to study the correlation between grain size and magnetic susceptibilty, selected more 800 samples, in Lacustrine sedi-ments from Nihewan Bain. The correlation coefficient of susceptibility with the content of 0. 2～ 35 μ m, especially 0.2～ 7.5 μ m, is positive, and with the content of 35～ 500 μ m is negative. This correlation is contrast to the loess deposits on top of profile, which shows the mechanism of magnetic response towardspaleoclimate changes in lacus-trine sediments is unlike that in loess. So, we can conclude that the susceptibility change in lake ( the sedimentsare mainly allogenic)sediments is controlled by the allogenic magnetic minerals. The fluctuations of susceptibilty indi-cate the changes of the lake level and paleoclimate. |
| |
| Keywords: | Haojiatai Section the content of the different grain gize magnetic susceptibility |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《沉积学报》浏览原始摘要信息 |
| 点击此处可从《沉积学报》下载免费的PDF全文 |
|
