|
|||||
|
|
| 南京老虎山黄土-古土壤剖面不同粒级组分的磁化率及其古气候意义 | |
| 引用本文： | 谢昌仁,李福春,王力波,金章东,潘根兴.南京老虎山黄土-古土壤剖面不同粒级组分的磁化率及其古气候意义[J].土壤通报,2004,35(2):159-162. |
| 作者姓名： | 谢昌仁 李福春 王力波 金章东 潘根兴 |
| 作者单位： | 1. 南京农业大学,农业资源与生态环境研究所,江苏,南京,210095 2. 国土资源部南京矿产地质研究所,江苏,南京,210016 3. 中国科学院南京地理与湖泊研究所,江苏,南京,210008 |
| 基金项目： | 中国博士后科学基金(第30批)资助 |
| 摘 要： | 利用沉降离心法将老虎山黄土-古土壤的酸不溶相分离成<2μm、2～45μm和>45μm三个粒级组分,并分别测定了这些组分和全岩的磁化率。结果表明,无论是全岩,还是三个不同粒级组分,它们的磁化率都可以单独作为长江中下游地区古气候演变的参考指标。其中,<2μm粒级的质量磁化率明显大于全岩和2～45μm、>45μm两粒级,而且其分辨率也明显高于2～45μm和>45μm这两个粒级组分。本实验结果还显示,虽然<2μum的质量磁化率最大,但对全岩质量磁化率的贡献率与2～45μm粒级相当,>45μm粒级的贡献率较低。 |
| 关 键 词： | 黄土-古土壤 粒级 磁化率 贡献率 南京老虎山 |
| 文章编号： | 0564-3945(2004)02-0159-04 |
| 修稿时间： | 2003年1月18日 |
Magnetic Susceptibility of Partide Size Fractions from Laohushan Loess- paleosol Sequence and Paleoclimate Significance in Nanjing, China |
|
| XIE Chang-ren,LI Fu-chun,WANG Li-bo,JIN Zhang-dong PAN Gen-xing.Magnetic Susceptibility of Partide Size Fractions from Laohushan Loess- paleosol Sequence and Paleoclimate Significance in Nanjing, China[J].Chinese Journal of Soil Science,2004,35(2):159-162. | |
| Authors: | XIE Chang-ren LI Fu-chun WANG Li-bo JIN Zhang-dong PAN Gen-xing |
| Institution: | XIE Chang-ren~1,LI Fu-chun~1,WANG Li-bo~2,JIN Zhang-dong~3 PAN Gen-xing~1 |
| Abstract: | In this paper, separation of <2μm, 2-45μm and >45μm particle size fractions of acetic-acid insoluble residues from a loess-paleosol sequence in a Laohushan depth Profile in the south of the lower Yangtze Basin were conducted and magnetic susceptibility of the different fractions as well as of the bulk sample were tested. The results indicated that both magnetic susceptibility of these size fractions and of the bulk samples could be a useful proxy recorder for paleo-climatic fluctuations. However, the magnetic susceptibility of the <2μm size fraction was greater than that of the larger fractions and the bulk sample, and the resolution as a proxy of this fraction was also better than the other fractions. From the finding we also found that though the magnetic susceptibility of <2μm fraction was largest, the contribution of this fine fraction to the bulk magnetic susceptibility was not larger than the 2-45μm fraction, while the contribution of the >45μm fraction was smallest. |
| Keywords: | Loess-paleosol sequence Grain-size fractions Magnetic susceptibility Partial contribution Laohushan profile |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |