珠江磨刀门河口表层沉积物磁性特征及其动力沉积环境意义

陈晖; 刘坤松; 郭晓娟; 刘锋; 杨清书; 谭超; 胡进

珠江磨刀门河口表层沉积物磁性特征及其动力沉积环境意义

1.
中山大学海洋科学学院河口海岸研究所, 广东广州 510006
2.
广东省水利水电科学研究院, 广东广州 510610
3.
华东师范大学河口海岸学国家重点实验室, 上海 200062

基金项目: 广东省水利科技创新项目（2016-21）；国家重点研发计划（2016YFC0402601）；河口海岸学国家重点实验室开放课题（SKLEC-KF201409）；中国博士后自然科学基金（2013M531890）。

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出版历程
- 收稿日期: 2016-06-27

Magnetic properties of surficial sediment and its implication for sedimentation dynamic environment in the Modaomen Outlet of the Pearl River Estuary

1.
Institute of Estuarine and Coastal Research, School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China
2.
Guangdong Research Institute of Water Resources and Hydropower, Guangzhou 510610, China
3.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China

摘要

摘要: 基于2015年3月珠江磨刀门河口表层沉积物磁学和粒度测量结果，研究磨刀门河口磁性特征空间分布规律，分析磁性参数与沉积物粒度的关系，并探讨其对沉积动力环境的响应。磁性参数磁化率（χ）和饱和等温剩磁（SIRM）均在拦门沙处出现低值区，并在10 m等深线外呈现向海递减趋势；频率磁化率（χ_fd%）、非磁滞剩磁磁化率（χ_ARM）以及比值参数χ_ARM/SIRM和χ_ARM/χ在拦门沙处出现低值区，而在拦门沙外呈现高值：表明研究区域磁性特征由亚铁磁性矿物主导，而拦门沙区域存在一定量的不完全反铁磁性矿物。粒度是影响沉积物磁性特征的重要因素，SIRM/χ等参数与粗颗粒组分（大于63 μm）呈显著正相关，χ_fd%等参数与小于16 μm粒级组分高度相关，结果显示χ_fd%、χ_ARM、χ_ARM/SIRM以及χ_ARM/χ等参数可作为本区域沉积物细颗粒组分（小于16 μm）的代用指标，而SIRM/χ则可作为粗颗粒组分（大于63 μm）的代用指标。基于沉积物类型、动力环境等综合考虑，选取SIRM、S_-300、SIRM/χ参数聚类分析，可将磨刀门河口动力沉积环境分为4个区，结果与该区域动力环境及动力地貌格局具有一致性。本研究不仅对了解新动力格局下磨刀门河口演变模式具有重要意义，还可以丰富河口沉积动力学研究方法。
- 磁性特征 /
- 粒度 /
- 空间分布 /
- 动力沉积环境 /
- 磨刀门河口
Abstract: Based on the magnetic measurement of surficial sediment in the Modaomen Outlet of the Pearl River Estuary in March 2015, we explored spatial distribution of magnetic properties, examined the relationship between magnetic parameters and sediment particle size, and addressed its response to the sedimentary dynamic environment. The values of susceptibility (χ)and saturation isothermal remanent magnetization (SIRM)were low in the sediment bar, and generally displayed a decreasing trend toward the sea outside the ten-meter isobaths. The values of frequency dependent susceptibility (χ_fd%), anhysteretic remanent magnetization (χ_ARM), χ_ARM/SIRM and χ_ARM/χ were also low in the sediment bar, however, it was high outside the sediment bar. These results revealed that the magnetic properties of study area were dominated by ferrimagnetic mineral, but there were still some antiferromagnetic minerals in the sediment bar. Particle size is an important factor affecting magnetic properties, SIRM/χ shows positive correlation with >63 μm fraction, magnetic parameters such as χ_fd%、χ_ARM、χ_ARM/SIRM and χ_ARM/χ display significantly positive correlation with <16 μm fraction, these results indicated that χ_fd%、χ_ARM、χ_ARM/SIRM and χ_ARM/χ could be used as proxies for finer fraction of sediments (<16 μm fraction), and SIRM/χ could be used as proxies for percentages of coarser fraction of sediments (>63 μm fraction). In light of the sediment types, dynamic environment in the Modaomen Outlet, the SIRM, S_-300 and SIRM/χ were applied to carry out cluster analysis, and the result has a remarkable consistency with the sedimentary dynamic environment and the dynamic geomorphology pattern. Our study is not only of great significance to understand the new evolution mode of the Modaomen Outlet in new dynamic patterns, but also can enrich the research method of sedimentation dynamics of estuary.
- magnetic properties /
- particle size /
- spatial distribution /
- sedimentation dynamic environment /
- Modaomen Outlet

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