Quantitative compensation of grain-size effects in elemental concentration: A Korean coastal sediments case study
Quantitative compensation of grain-size effects in elemental concentration: A Korean coastal sediments case study
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DOI：
10.1016/j.ecss.2014.09.024
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发表时间：
2014-12
影响因子：
2.8
通讯作者：
H. Jung;D. Lim;Zhaokai Xu;Jung-Hoon Kang
中科院分区：
文献类型：
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作者：
H. Jung;D. Lim;Zhaokai Xu;Jung-Hoon Kang
韩国不同海岸环境中沉积物的元素浓度(C元素)受到粒度效应(GSE)的强烈制约，特别是在补偿了无金属碳酸盐和有机物质的含量后。然而，一些元素(特别是金属元素)中的GSE不能被常规的铝归一化(C元素/C-Al比)完全抵消，而且Al和元素浓度之间的最佳拟合回归线可能不是线性的，而是曲线，也不能通过原点(0，0)。结果表明，既存在传统的原生性GSE，又存在继发性原生GSE。这种原生和次生GSE可能分别是由物理和化学过程引起的，例如无金属粗粒沉积物的石英稀释效应和富含有机物质的细粒沉积物的成岩反应。此外，朝鲜海岸沉积物中的这些GSE可用二次方程进行定量归一化：C元素=a0·CAl+a1·(CAl)2，其中a0和a1分别为原生和次生GSE的常数。
Element concentrations (C element) of the sediments in the diverse Korean coastal environments were constrained strongly by the grain-size effect (GSE), especially after compensation for metal-free carbonate and organic material contents. However, the GSE in some elements (especially metallic elements) was not completely offset by conventional Al-normalization (C element/C Al ratio), and further the best-fit regression lines between the concentrations of Al and elements may not be linear, but instead curved, and also cannot pass through the origin point (0, 0). The results suggest the presence of conventional GSE (primary GSE) as well as another GSE (ie, secondary GSE), which was well supported by the factor analysis for the variable of C element/C Al ratios. Such primary and secondary GSEs are likely caused by physical and chemical processes, respectively, such as the quartz-dilution effect by metal-free, coarse-grained sediments and diagenetic reactions in organic-rich, fine-grained sediments. Furthermore, these GSEs in Korean coastal sediments can be quantitatively normalized by a quadratic equation: C element= a 0· C Al+ a 1·(C Al) 2, where a 0 and a 1 are constants for the primary and the secondary GSEs, respectively.