The geochemical composition of sediment as a proxy of provenance and weathering intensity: a case study of Southwest Nigeria’s Coastal Creeks
Journal Title: Geology, Geophysics & Environment - Year 2017, Vol 43, Issue 3
Abstract
The study of geochemical composition of sediments was undertaken to evaluate the degree of weathering and appraise relative proportion of mafic and felsic rock materials being transported from source to sink. Three hundred grams each of air-dried samples was wet-sieved using 2mm mesh sieve diameter to separate the gravel size particles from sand and mud sizes. Fifty grams each from these samples was used for standard pipetting method in order to determine distribution of sand, silt and clay fractions in sediments. Inductively coupled plasma-Mass Spectrometer was used to determine 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 segment of Badagry creek. The data generated from elemental ratios such as Al2O3/TiO2, TiO2/Zr and binary plots of Th/Sc-Cr/Sc; Th-Sc, Y/Ni-Cr/V, TiO2-Zr and ICV-CIA (index of compositional Variability against chemical index of alteration) interpreted that source sediments are composed of upper and lower crustal compositions. Also, variation in the proportion of felsic and mafic components marked the creeks. For instance, Yewa and western Badagry creeks are more enriched in mafic constituents, whereas enrichment of felsic materials is significant at the eastern Badagry creek. Inferring from chemical index of alteration and plagioclase index of alteration (PIA), Yewa and western Badagry creeks have been moderately to intensely weathered and incipient weathering was identified at eastern Badagry creek.
Authors and Affiliations
Olusegun Adebayo Phillips, Adenike Omotayo Falana, Adegboyega Joel Adebayo
Keywords
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- EP ID EP265442
- DOI 10.7494/geol.2017.43.3.229
- Views 80
- Downloads 0
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