干旱区生态环境知识资源中心(Arid): Lithological mapping of Ogun State, Southwestern Nigeria, using aeroradiospectrometry

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DOI	10.1007/s12665-019-8256-6
	Lithological mapping of Ogun State, Southwestern Nigeria, using aeroradiospectrometry
	Olowofela, J. A.1; Okeyode, I. C.1; Idowu, O. A.2; Olurin, O. T.1; Ogunsanwo, F. O.3
通讯作者	Ogunsanwo, F. O.
来源期刊	ENVIRONMENTAL EARTH SCIENCES
ISSN	1866-6280
EISSN	1866-6299
出版年	2019
卷号	78 期号:8
英文摘要	Airborne gamma-ray spectrometric has gained more recognition over decades, since it serves majorly as a geological mapping tool in most areas. This method utilizes the variation in the three primordial radionuclide concentrations, U, K and Th, to study the lithology of different bedrocks. It measures the earth surface natural radionuclides, which enhances the distribution of soil- and rock-type formations. Ogun State, the study area, is bounded by geographical coordinates of easting 3.0 degrees-5.0 degrees and northing 6.2 degrees-7.8 degrees of tropical rainforest region, Southwestern Nigeria. The present study aims at mapping the distribution of radioelements and delineates the anomalies associated with various interpreted radiometric lithological (IRL) units using the three radioelements U (ppm), Th (ppm), K (%) and the total count (TC) in Ur and their ratios, U/K, U/Th and Th/K. The dose rates were also considered in the study. The lithology was described in terms of three formations; basement, basement-sediment and sediment. With the aid of Geosoft software (Oasis montaj) and Golden Surfer 10 software, the contour map was obtained which showed the trend of distribution of radioelements alongside their ratios. The uranium migration index was also carried out to check the regions associated with uranium leaching. The result revealed that uranium is more concentrated in NW and partly NE directions of the study area. This may be due to the presence of shale and possibly phosphate-bearing rock and metamorphozised granitic rocks while thorium has the largest deposit due to quarry activity which is associated with blasting of rocks and deposition from dumpsites. The study also revealed that only 2 out of all the 47IRL units, A1 and C4, which belong to basement and basement-sediment formations have their mean dose value to be 1.51 mSv/yr and 1.43 mSv/yr which are above the 1 mS/yr recommended limit.
英文关键词	Aeroradiometric Radioelement Geological formation Ogun State Mapping
类型	Article
语种	英语
国家	Nigeria
收录类别	SCI-E
WOS记录号	WOS:000464842900011
WOS关键词	GAMMA-RAY SPECTROMETRY ; AREA
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215409
作者单位	1.Fed Univ Agr, Dept Phys, Abeokuta, Nigeria; 2.Fed Univ Agr, Dept Water Resources Management & Agrometeorol, Abeokuta, Nigeria; 3.Tai Solarin Univ Educ, Dept Phys, Ijagun, Nigeria
推荐引用方式 GB/T 7714	Olowofela, J. A.,Okeyode, I. C.,Idowu, O. A.,et al. Lithological mapping of Ogun State, Southwestern Nigeria, using aeroradiospectrometry[J],2019,78(8).
APA	Olowofela, J. A.,Okeyode, I. C.,Idowu, O. A.,Olurin, O. T.,&Ogunsanwo, F. O..(2019).Lithological mapping of Ogun State, Southwestern Nigeria, using aeroradiospectrometry.ENVIRONMENTAL EARTH SCIENCES,78(8).
MLA	Olowofela, J. A.,et al."Lithological mapping of Ogun State, Southwestern Nigeria, using aeroradiospectrometry".ENVIRONMENTAL EARTH SCIENCES 78.8(2019).