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首页> 外文期刊>Geology, Geophysics & Environment >The geochemical composition of sediment as a proxy of provenance and weathering intensity: a case study of Southwest Nigeria's Coastal Creeks
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The geochemical composition of sediment as a proxy of provenance and weathering intensity: a case study of Southwest Nigeria's Coastal Creeks

机译：沉积物的地球化学组成作为物理和风化强度的代理：以西南尼日利亚沿海小溪为例

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The study of the geochemical composition of sediments was undertaken to evaluate the degree of weathering and appraise the relative proportion of mafic and felsic rock materials being transported from source to sink. Thirty-three surface sediment samples collected from the creeks were used for particle size and chemical analyses. An inductively coupled plasma-Mass Spectrometer was used to determine the elemental composition of the sediments. The clay dominated Yewa and western Badagry creeks gave evidence of higher average concentrations of Ni, Sr, Y, Nb, Sc, Co, V, and Th than the eastern end of segment of Badagry Creek. The data generated from elemental ratios such as Al_2O_3/TiO_2, TiO_2/Zr and binary plots of Th/Sc-Cr/Sc, Th-Sc, Y/Ni-Cr/V, TiO_2-Zr and ICV-CIA (index of compositional variability against chemical index of alteration) showed that source sediments are composed of upper and lower crustal compositions. Also, the creeks were marked by their variation in terms of the proportion of felsic and mafic components. For instance, Yewa and western Badagry creeks are more enriched in mafic constituents, whereas the enrichment of felsic materials is significant at the eastern end of Badagry Creek. Inferring from the chemical index of alteration and plagioclase index of alteration (PIA), the Yewa and western Badagry creeks have been moderately to intensely weathered and incipient weathering was identified in the eastern end of Badagry Creek.
机译：对沉积物的地球化学组成的研究进行了评价风化程度，并评估从源源到水槽运输的MAFIC和ULESIC岩石材料的相对比例。从小溪收集的三十三个表面沉积物样品用于粒度和化学分析。使用电感耦合等离子体质谱仪来确定沉积物的元素组成。粘土占据了伊美和西部巴德溪小溪的证据证明了尼，SR，Y，NB，SC，CO，V，以及Badagry Creek的东端的效率更高。从元素比例产生的数据，例如Al_2O_3 / TiO_2，TiO_2 / Zr和Th / SC-Cr / Sc，Th-Sc，Y / Ni-Cr / V，TiO_2-Zr和ICV-CIA的二进制曲线（组成指数改变化学指标的可变性）显示源沉积物由上下地壳组合物组成。此外，溪流标志着他们的术术和乳头组分比例的变化。例如，Yewa和Western Badagry Creeks更丰富在MAFIC成分中，而肠道材料的富集在Badagry Creek的东端是重要的。从改变和Plagioclase的改变（PIA）的化学指标中推断出来，Yewa和Western Badagry Creeks在Badagry Creek东端发现了强烈风化，初期风化。

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