Lithogenic concentrations of trace metals in soils and saprolites over crystalline basement rocks: A case study from SW Nigeria

Tijani, Moshood N.; Okunlola, Olugbenga A.; Abimbola, Akinlolu F.

doi:10.1016/j.jafrearsci.2006.08.003

Cited by 43 publications

(22 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Chandrajith et al, 2000Chandrajith et al, , 2001Key et al, 2004) and Europe (Salminen et al, 2005) (Wedepohl 1995), dash-dot = average Local Older Granite value (see Table 3), long dash = Local metasediment value (Tijani et al, 2006), long dash grey = local Zungeru Mylonites (Ajibade et al, 2008), solid grey = average European stream sediment value (Salminen et al, 2005), dotted line = average Local Migmatitic Gneiss value (see Table 2). The notches represent the 95% confidence limits around the median value for each group, outlier values are shown as open circles.…”

Section: Resultsmentioning

confidence: 99%

Investigating high zircon concentrations in the fine fraction of stream sediments draining the Pan-African Dahomeyan Terrane in Nigeria

Johnson

Horstwood²,

Lapworth

et al. 2012

Applied Geochemistry

View full text Add to dashboard Cite

Sixteen hundred stream sediments (<150 μm fraction) collected during regional geochemical surveys in central and SW Nigeria have high median and maximum concentrations of Zr that exceed corresponding Zr concentrations found in stream sediments collected from elsewhere in the World with similar bedrock geology. X-ray diffraction studies on a sub-set of the analysed stream sediments showed that Zr is predominantly found in detrital zircon grains. However, the main proximal source rocks (Pan-African 'Older Granites' of Nigeria and their Proterozoic migmatitic gneiss country rocks) are not enriched in zircon (or Zr). Nevertheless, U-Pb LA-ICP-MS dating with cathodoluminescence imaging on detrital zircons, both from stream sediment samples and underlying Pan-African 'Older Granites' confirms a local bedrock source for the stream sediment zircons. A combination of tropical/chemical weathering and continuous physical weathering, both by 'wet season' flash flooding and 'dry season' unidirectional winds are interpreted to have effectively broken down bedrock silicate minerals and removed much of the resultant clay phases, thereby increasing the Zr contents in stream sediments. The strong correlation between winnowing index (Th/Al) and Zr concentration across the study area support this interpretation. Therefore, 'anomalous' high values of Zr, as well as other elements concentrated in resistant 'heavy' minerals in Nigeria's streams may not reflect proximal bedrock concentrations of these elements. This conclusion has important implications for using stream sediment chemistry as an exploration tool in Nigeria for primary metal deposits associated with heavy minerals.

show abstract

Section: Resultsmentioning

confidence: 99%

Investigating high zircon concentrations in the fine fraction of stream sediments draining the Pan-African Dahomeyan Terrane in Nigeria

Johnson

Horstwood²,

Lapworth

et al. 2012

Applied Geochemistry

View full text Add to dashboard Cite

show abstract

“…Trace elements showed completely different depth patterns, possibly due to the different patterns of natural processes and anthropogenic inputs. Tijani et al (2006) found various degrees of enrichment of Pb, Rb, Sr and Ba in moderately weathered granite-gneiss and weathered schist-quartzite settings, in contrast to a depletion of the same elements in soils on weakly weathered pegmatite bedrocks.…”

Section: Introductionmentioning

confidence: 87%

“…In pedon Do1, the behavior of Fe, Cr, Cu, Ni and, to a large extent, also V and Zn are similar. These elements Tijani et al (2006) studied weakly developed soils derived from pegmatite, and attributed the depletion of Co, Cr, Ni, Pb, V and Zn to little or no release of the elements during weathering process, reflecting their low absolute concentration in pegmatite as compared to other bedrocks. However, in the case of the Pe1 and Do1 pedons, where the background concentrations of trace elements is high, depletion can be attributed to high concentration of easily weatherable minerals, strong leaching and low contents of iron and manganese oxides and hydroxides.…”

Section: Enrichment and Depletion Patternsmentioning

confidence: 99%

Effect of geo-pedological conditions on the distribution and chemical speciation of selected trace elements in forest soils of western Alborz, Iran

et al. 2009

View full text Add to dashboard Cite

“…The dominant rock types are quartzites of the metasedimentary series and the migmatite complex made up of banded gneisses, augen gneisses and migmatites ( Figure 2 ). 12 , 28 , 29 These rocks are intruded by pegmatite, quartz veins, aplite and dioritic dykes. Minor rocks of substantial coverage include the amphibolites.…”

Section: Methodsmentioning

confidence: 99%

“…Different industrial pollutants are discharged into workplace and neighborhood environments in the form of particulate matter, which in turn settle on soil, and through direct discharge of industrial waste product directly into the immediate environment and nearby water bodies as industrial effluents. 12–16 These practices and many more are common in cities of developing nations such as Ibadan, Southwestern Nigeria.…”

Section: Introductionmentioning

confidence: 99%

Heavy Metal Contamination and Ecological Risk Assessment in Soils and Sediments of an Industrial Area in Southwestern Nigeria

Kolawole

Olatunji

Jimoh

et al. 2018

Journal of Health and Pollution

View full text Add to dashboard Cite

Background.Increased growth of industrial activities, especially in urban centers, is one of the main sources of toxic substances in Nigeria. The level of these impacts is not well known. Soil and sediment samples from one such industrial area were examined for their mineralogical composition and heavy metals contents in order to assess the level of contamination and potential ecological risk status.Methods.Mineralogical composition of the media and their heavy metals concentrations were determined using X-ray diffractometry and inductively coupled plasma-mass spectrometry methods, respectively. Ecological risk assessment was carried out using single (contamination factor, geo-accumulation index, enrichment factor) and multi-elemental (contamination degree, pollution index and modified pollution index) standard indices.Results.The average heavy metal concentrations in soils and sediments followed the order magnesium (Mn) > chromium (Cr) > lead (Pb) > copper (Cu) > cadmium (Cd) > cobalt (Co) > nickel (Ni), with corresponding values for soils and sediments of 324.3, 79.9, 66.1, 40.7, 14.3, 9.1, 6.8 mg kg−1 and 266.8, 78.6, 40.6, 39.8, 12.9, 8.4, 4.6 mg kg−1, respectively. Principal component (PC) analysis of the results indicated three main sources of metals (industrial, vehicular activities and geogenic input). Evaluated contamination factor (Cf), enrichment factor (Ef) and geo-accumulation index (Igeo) revealed very high contamination for Pb, Cd and Cu in all of the samples, with calculated pollution index (PI) and modified pollution index (MPI) revealing that all the samples were severely polluted. Calculated potential ecological risk factor (ERi) within the industrial area demonstrated a strong potential ecological risk for Cd, Pb and Cu.Conclusions.Activities in the industrial area have affected the quality of the analyzed environmental media, with possible detrimental health consequences. Regular environmental monitoring of the industrial area and the formulation of appropriate policies that support reduction of contamination are strongly recommended. However, due to the limitations of comparing site samples with a single control sample in this work, further study is recommended to compliment this preliminary study.Competing Interests.The authors declare no competing financial interests

show abstract

Lithogenic concentrations of trace metals in soils and saprolites over crystalline basement rocks: A case study from SW Nigeria

Cited by 43 publications

References 28 publications

Investigating high zircon concentrations in the fine fraction of stream sediments draining the Pan-African Dahomeyan Terrane in Nigeria

Investigating high zircon concentrations in the fine fraction of stream sediments draining the Pan-African Dahomeyan Terrane in Nigeria

Effect of geo-pedological conditions on the distribution and chemical speciation of selected trace elements in forest soils of western Alborz, Iran

Heavy Metal Contamination and Ecological Risk Assessment in Soils and Sediments of an Industrial Area in Southwestern Nigeria

Contact Info

Product

Resources

About