| 环境磁学样品干燥过程中的磁性效应 |
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| 引用本文： | 陈满荣,俞立中,韩晓非.环境磁学样品干燥过程中的磁性效应[J].沉积学报,2001,19(4):630-636. |
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| 作者姓名： | 陈满荣 俞立中 韩晓非 |
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| 作者单位： | 1.扬州大学 江苏扬州 225009; |
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| 基金项目： | 国家自然科学基金 (批准号 :49871 0 68) |
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| 摘 要： | 对长江口南岸潮滩沉积物柱样和表层样品的烘干、风干和冻干法处理,然后进行系统磁性测量和水分、有机质的测定。实验结果得知:以冻干法为参照,烘干和风干方法对样品的磁参数的稳定性影响很小,但研究质地粘重样品时,应避免采用风干方法或校正风干样含水量质量后计算相关的磁参数。有机质的含量与主要磁参数成正相关,它对磁参数的影响很小
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| 关 键 词： | 环境磁学 烘干 风干 冻干 磁性效应 |
| 文章编号： | 1000-0550(2001)04-0630-07 |
| 收稿时间： | 2000-12-06 |
| 修稿时间： | 2000年12月6日 |
Environmental Magnetism Research on the Magnetic Effects by Different Drying Processes to Tidal Flat Sediments |
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| CHEN Man rong,YU Li zhong,HAN Xiao fei.Environmental Magnetism Research on the Magnetic Effects by Different Drying Processes to Tidal Flat Sediments[J].Acta Sedimentologica Sinica,2001,19(4):630-636. |
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| Authors: | CHEN Man rong YU Li zhong HAN Xiao fei |
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| Institution: | 1.Yangzhou University, Yangzhou Jiangsu 225009;2.East China Normal University, Shanghai 200062 |
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| Abstract: | Magnetic effects in sediment of Yangtze River estuary tidal flat is studied in laboratory by different drying treatments. Three treatments, including oven-drying, air-drying and lyophilization are applied in the core（total length:21 cm, sampled from high tidal-flat）and tidal flat surface（0 ~ 5 cm）sediment samples（high, middle and low tidal flat）, and then the magnetic properties, water and total organic matter contents has been measured systematically. Results show that oven-drying, air-drying and lyophilization treatment processes de affect the most of magnetic minerals . The SIRM-χ crossplot of the core samples shows linearly significant correlation, the upper part sub-samples of the core have high value of SIRM andχ , the bottom part have low value of SIRM andχ. According to F300mT, "S- 20mT and"S- 100mT, ferrimagnetic minerals dominate the magnetic properties in the Yangtze River estuary tidal flat sediments. The particlesize of whole core become finer from bottom to upper sub-samples. The differences of the three samples treatments are insignificant, according to type of magnetic minerals, consistence of dominated magnetic minerals, concentration of magnetic minerals and particle size, in the whole core sub-samples and its variations. The oven-drying is still effective sample treatment, and the lyophilization is the best sample drying method of the three. Under the general condition, the effect of oven-drying and air-drying samples to magnetic change, compare with lyophilization, is so little that it does not result in magnetic parameters wrong interpretation. However, for clay samples, airdrying samples will cause much difference in the value of magnetic parameters, thus its air-drying water contents after magnetic measurement should be avoided or calibrated. Another result shows that organic matter contents are positively correlated with main magnetic parameters. This study has some limits because of only test for the tidal flat sediment samples, so if do some further deduction on this topic, more studies on various sediments and soiis sampies are necessary. |
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| Keywords: | environmental magnetism oven drying air drying lyophilization magnetic effects |
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