| 潮滩表层沉积物磁性特征的季节性变化及其对沉积动力作用的响应:以杭州湾北岸为例 |
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| 引用本文： | 邢云,张卫国,杨世伦,俞立中.潮滩表层沉积物磁性特征的季节性变化及其对沉积动力作用的响应:以杭州湾北岸为例[J].沉积学报,2007,25(2):267-273. |
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| 作者姓名： | 邢云 张卫国 杨世伦 俞立中 |
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| 作者单位： | 华东师范大学河口与海岸学国家重点实验室 上海 200062 |
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| 基金项目： | 国家自然科学基金
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教育部长江学者和创新团队发展计划 |
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| 摘 要： | 根据2004年9月—2005年8月杭州湾北岸中潮滩固定观测点重复采集的表层沉积物的磁学参数和粒度分析,探讨了研究区域潮滩沉积物磁学性质的季节性变化及其对沉积动力的响应。 结果表明, 该观测点潮滩沉积物磁学参数存在显著的月际变化，2004年12月底—2005年5月上旬的半年中，SIRM、χARM、χfd%、χARM/χ、χARM/SIRM等参数出现高值，指示了沉积物中含有较多的细晶粒亚铁磁性矿物，对应于潮滩淤积时段和较细的沉积物粒级组成，其余各月上述磁参数值较低，对应于潮滩沉积物较粗的侵蚀期。上述结果表明，沉积物的磁性特征可以很好地反映潮滩冲淤过程中沉积动力的变化。
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| 关 键 词： | 沉积物 磁性特征 沉积动力 潮滩 杭州湾 |
| 文章编号： | 1000-0550（2007）02-0267-07 |
| 收稿时间： | 2006-09-09 |
| 修稿时间： | 2006-09-092006-10-18 |
Seasonal Changes in Magnetic Properties of Surficial Tidal Flat Sediment and Their Response to Sedimentation Dynamics: a case study from the coast of the Hangzhou Bay |
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| XING Yun,ZHANG Wei-guo,YANG Shi-lun,YU Li-zhong.Seasonal Changes in Magnetic Properties of Surficial Tidal Flat Sediment and Their Response to Sedimentation Dynamics: a case study from the coast of the Hangzhou Bay[J].Acta Sedimentologica Sinica,2007,25(2):267-273. |
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| Authors: | XING Yun ZHANG Wei-guo YANG Shi-lun YU Li-zhong |
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| Institution: | State Key Laboratory of Estuarine and Coastal Research, East China Normal University,Shanghai 200062 |
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| Abstract: | This study discussed the monthly variations of magnetic properties of surface intertidal sediments along the northern bank of the Hangzhou Bay and their response to sedimentation dynamics. Forty nine surface sediment samples were collected at a fixed sampling site in the middle tidal flat from September 2004 to August 2005. The results indicate that magnetic properties of surface sediments vary significantly with month. From late December of 2004 to early May of 2005, the values of SIRM, χARM, χfd%, χARM/χ and χARM/SIRM in surface sediments are relatively higher, suggesting higher concentration of ferrimagnetic minerals with finer grain size. Samples with such magnetic properties occur in the period of tidal flat accretion with a finer sediment particle size composition. For samples from the remaining months, the above magnetic parameters have lower values, corresponding to a period of tidal flat erosion with a coarse particle size composition. Therefore, magnetic properties of surface sediments can reflect the changes in sedimentation dynamics during the process of tidal flat accretion erosion cycle. |
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| Keywords: | sediment magnetic properties sedimentation dynamics tidal flat Hangzhou Bay |
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