Terrigenous Mineral Constrains on the Grain-Size Distribution and Geochemical Composition of Sediments in the Inner Shelf of the East China Sea
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摘要: 通过对东海内陆架EC2005孔柱状沉积物陆源矿物、粒度及地球化学成分分析, 尝试探讨三者之间的制约关系.该孔柱状沉积物主要矿物成分为粘土矿物、石英以及长石.石英和长石含量控制着平均粒径的大小.矿物含量与化学成分含量表现出较好的相关性, 体现了矿物对地球化学成分的控制.沉积物中各种矿物颗粒的大小差别造成了沉积物粒度的差异, 矿物间化学组分的不同是影响沉积物化学成分含量的主要因素, 其往往通过粒度组成间接地表现出来, 这就造成了“元素的粒度控制”表面现象, 实质上是矿物的种类和含量对粒度和地球化学成分起控制作用.Abstract: The grain-size distribution, geochemical compositions and terrigenous mineral components of sediments of Core EC2005 in the inner shelf of the East China Sea (ECS) are analyzed to probe into their possible inherent relationships.Terrigenous components in Core EC2005 are dominated by clay minerals, quartz and feldspar.The variation of mean grain size of the downhole is mainly controlled by the quartz and feldspar content.The mineral components show good correlation to geochemical compositions, suggesting the mineral constrains on the chemical elements in the sediments.Our study shows that the grain-size and the geochemical composition of terrigenous mineral particles are the main factors that control the grain-size parameters and geochemical composition of sediments.The mineral constrains on the grain-size distribution and geochemical composition are crucial, whereas the grain-size distribution can only affect the geochemical composition via changes in mineral components.
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Key words:
- mineral /
- grain-size /
- geochemical composition /
- Core EC2005 /
- inner shelf of the East China Sea /
- sedimentology.
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图 1 研究区EC2005孔、河口样品站位和沉积物分布(重绘自秦蕴珊等, 1987)
图中黑圆圈代表EC2005孔站位, 黑五角星代表长江和瓯江样品站位, 瓯江2个站位基本重合
Fig. 1. Locations of Core EC2005, estuarine samples and sediment distribution in the study area
图 2 EC2005孔沉积物地球化学成分、矿物含量以及平均粒径垂直分布
Fig. 2. Depth profiles of some geochemical compositions, mineral components and mean grain-size of Core EC2005
图 3 EC2005孔沉积物矿物含量、粒度与地球化学成分的关系
a.粒度与矿物含量的关系; b.地球化学成分与粘土矿物含量的关系
Fig. 3. Relationship with mineral components, grain-size and geochemical compositions of Core EC2005
图 4 EC2005孔沉积物单矿物与地球化学成分的关系
Fig. 4. Relationships between geochemical compositions and sediment single mineral of Core EC2005
图 5 陆源矿物、粒度与化学成分的相互关系
Fig. 5. Correlations among mineral components, grain-size and geochemical compositions of terrigenous sediment
表 1 EC2005孔地球化学分析质量报告
Table 1. Detection limit of geochemical compositions in Core EC2005
表 2 东海内陆架EC2005孔沉积物化学成分与粒度相关性
Table 2. Correlation between geochemical compositions and grain-size of Core EC2005
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