Secondary grain-size effects on Li and Cs concentrations and appropriate normalization procedures for coastal sediments

Secondary grain-size effects on Li and Cs concentrations and appropriate normalization procedures for coastal sediments
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次生粒度对 Li 和 Cs 浓度的影响以及沿海沉积物的适当标准化程序

DOI:
10.1016/j.ecss.2016.03.028
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发表时间:
2016-06
影响因子:
2.8
通讯作者:
Kapsik Jeong
Kapsik Jeong
中科院分区:
地球科学3区
文献类型:
--
作者:
Hoisoo Jung;Dhongil Lim;Zhaokai Xu;Kapsik Jeong

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沉积物粒度效应(GSE)是与元素浓度和同位素组成的解释相关的基本因素,已使用保守元素如铝(Al)、铯(Cs)和锂(Li)(C(Al,Cs,Li))进行标准化,这些保守元素用作粒度、矿物学和有机质的天然金属控制变量的代理。然而,据报道,即使在通过Al归一化程序补偿后,特别是对于过渡金属(CT.M)的浓度,仍存在次级GSE。这种二次效应也发生在本研究中检查的韩国沿海沉积物的C(Li,Cs)/CAl比率。Cs和Li浓度上的初级和次级GSE可以分别通过石英稀释效应和层状硅酸盐矿物的Cs和Li掺入效应来解释,基于涉及三种组分端元的模型:主要由石英和长石组成的不含Cs和Li的砂为主沉积物组分,主要由云母组成的含Cs和Li的粉砂组分,伊利石以粘土为主,Cs和Li富集。虽然原生和次生GSE对海岸沉积物中过渡金属(特别是Cu和Ni)浓度的影响可以通过将金属浓度除以Al浓度的平方(CT. M./(CA 1)2),GSE也可以通过将浓度除以精确的Cs(或Li)浓度(CT. M./ CC)。
The sediment grain-size effect (GSE), a fundamental factor relevant to the interpretation of elemental concentrations and isotopic compositions, has been normalized using conservative elements such as aluminum (Al), cesium (Cs), and lithium (Li) (C(Al,Cs,Li)), which serve as proxies for the natural metal-controlling variables of grain size, mineralogy, and organic matter. However, a secondary GSE reportedly remains even after compensation by the Al-normalization procedure, particularly for the concentrations of transition metals (CT.M). This secondary effect also occurred in the C(Li,Cs)/CAlratios of the Korean coastal sediments examined in this study. The primary and secondary GSEs on Cs and Li concentrations can be explained by the quartz-dilution effect and the Cs- and Li-incorporation effect of phyllosilicate minerals, respectively, based on a model involving three component end-members: a Cs- and Li-free sand-dominated sediment component consisting mostly of quartz and feldspar, a Cs- and Li-bearing silt-dominated component of mica, and a Cs- and Li-enriched clay-dominated component of illite. Although the primary and secondary GSEs on the concentrations of transition metals (particularly Cu and Ni) in coastal sediments might be normalized by dividing the metal concentrations by the square of the Al concentration (CT.M./(CAl)2), the GSEs can also be normalized by dividing the concentrations by the exact Cs (or Li) concentration (CT.M./CCs).
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影响因子: 2.8
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