Statistical evaluation of stream sediment geochemistry in interpreting the river catchment of high-grade metamorphic terrains

Ranasinghe, P.N.; Fernando, G.W.A.R.; Dissanayake, C.B.; Rupasinghe, M.S.; Witter, Donna L.

doi:10.1016/j.gexplo.2009.07.003

Cited by 31 publications

(15 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The implication is that, the source of these elements in the stream sediments are not far from the sample locations or the sources could be from weathered basement rocks and dissolution of these elements in stream sediments. This may be also as a result of the chemical composition of the rocks which include granitic gneisses, metabasites, syenitic gneisses and monzonitic gneisses which show enrichment of these elements (Ranasinghe et al, 2009). The source could be from the Bed load which is the sediment transported by a combination of rolling and skipping of particles along the bed of the stream channel.…”

Section: Discussionmentioning

confidence: 99%

“…Since elements are not static but migrate within the geochemical environment, these sediments are considered to be important carriers of elements. However, sediment yield and the geochemistry of stream sediments are controlled not only by physical and chemical weathering of parent rocks, but also by factors such as climate, hydrology and morphology of the basin (Ranasinghe et al, 2009). Sufficiently intense rainfall can initiate bed load transport, bringing the 100µm fraction into suspension (Fletcher, 1996).Stream sediment samples were used to represent the mineral composition of the pegmatites through which the streams flow.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preliminary investigation of pegmatites in Obudu Area, Southeastern Nigeria, using stream sediments geochemistry

Edem¹,

Ekwueme²,

Ephraim³

et al. 2016

Glo Jnl Pure Appl Sci

View full text Add to dashboard Cite

Stream sediments of Obudu Plateau were investigated with a view to elucidating their geochemical features, mineralization potentials and element concentrations. Stream sediment samples were collected from Southern Obudu Plateau area and analyzed for 22 elements, comprising major and trace elements, using Inductively Coupled Plasma -Mass Spectrometry (ICP-MS). The data obtained were statistically treated. Ba, Sr, Nb, Co, Pb, Ta and Na show moderate to high concentrations, when compared with threshold values of these elements. The concentrations of these elements in sediments of Southern Obudu show low mineralization potentials of pegmatites of the Obudu Plateau. The elements in Obudu stream sediments show perfect, strong, moderate and weak correlations among themselves, indicative of variations in their mobility.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preliminary investigation of pegmatites in Obudu Area, Southeastern Nigeria, using stream sediments geochemistry

Edem¹,

Ekwueme²,

Ephraim³

et al. 2016

Glo Jnl Pure Appl Sci

View full text Add to dashboard Cite

show abstract

“…Many studies have been conducted on the accumulation of trace elements in river basins of mined areas in Europe, Asia, North America and Brazil. These studies have reported the elevated presence of various trace elements in water and stream sediments and related adverse environmental effects (Albanese et al 2006;Almeida 2005;Ranasinghe et al 2009;Thornton 2012). A similar situation can be studied in the IQ, where various trace elements, for example, As, Cd, Cr, Ni, Pb, and Zn, occur in partly excessive concentrations in both waters and in stream sediments (Costa 2007;Mendes 2007;Parra et al 2007;Pereira et al 2007).…”

Section: Study Areamentioning

confidence: 91%

Iron Quadrangle stream sediments, Brazil: geochemical maps and reference values

et al. 2015

View full text Add to dashboard Cite

Geochemical mapping and the determination of reference values receive increasing attention. The need to know regional geochemical background data as well as the spatial allocation of areas with anomalous geochemical concentrations and chances to identify their major sources motivate the interest. Here, results from a high-density geochemical mapping exercise and derived related reference values are presented; 541 stream sediment samples have been collected across the Iron Quadrangle (IQ), Brazil, with a density of one sample per 13 km 2 . Geochemical maps were compiled using the inverse distance weighted interpolation method. ''Normal'' concentrations were distinguished from anomalies with the separation-byconcentration-range technique, where positive anomalies are defined by the ''boxplot'' Upper Inner Fence (UIF) rule. More than 70 % of the IQ show exclusively geogenic concentration ranges for the elements studied. About 20 % represent positive anomalies, likely related to both near surface rock types and to human interference. Distinct anthropogenic anomalies, notably from mining activities explain 5-10 % of all samples. This first high-density sampling in the IQ allows delineating the role of lithology on the elemental composition of stream sediments, and to establish reference values for the main river basins-thus pinpointing localities, cities and fluvial basins that are exposed to environmental risks and need to be protected.

show abstract

“…Many studies have been conducted on the accumulation of trace elements in river basins of mined areas in Europe, Asia, North America and Brazil. These studies have reported the elevated presence of various trace elements in water and stream sediments and related adverse environmental effects (Albanese et al 2006;Almeida 2005;Ranasinghe et al 2009;Thornton 2012). A similar situation can be studied in the IQ, where various trace elements, e.g., As, Cd, Cr, Ni, Pb, and Zn, occur in partly excessive concentrations in both waters and in stream sediments (Costa 2007;Mendes 2007;Parra et al 2007;Pereira et al 2007, Deschamps andMatschullat 2011;Mendonça 2012;Varajão et al, 2010. Three major lithostratigraphic units characterize the regional geology: (1) Archaean to Proterozoic granite-gneiss basement, (2) Archaean greenstone belt, and (3) Proterozoic supracrustal sequence.…”

Section: Study Areamentioning

confidence: 99%

Geochemical mapping of potentially hazardous elements in surface waters and stream sediments of the Quadrilátero Ferrífero, Brazil

Costa¹,

Matschullat²,

Leite³

et al. 2018

Geochim. Bras.

View full text Add to dashboard Cite

RESUMOO mapeamento geoquímico e a determinação das concentrações dos valores de referências de elementos potencialmente perigosos no ambiente vêm obtendo uma crescente relevância nos últimos anos. A necessidade de conhecer dados geoquímicos regionais, bem como a alocação espacial de áreas com concentrações de elementos anômalos e as chances de identificar suas principais fontes motivam o interesse. Aqui, resultados de um exercício de mapeamento geoquímico e derivados de valores de referência relacionados são apresentados. Foram coletadas 541 amostras de sedimentos e águas superficiais em todo o Quadrilátero Ferrífero (QF), Brasil, com uma densidade de 1 amostra por 13 km 2 . Para confecção dos mapas geoquímicos foi utilizada a técnica de interpolação denominada inverso da distância ponderada (IDW) e para distinguir os valores considerados normais das anomalias, foi adotada a técnica de separação por faixas de concentração, na qual as anomalias são definidas pela regra do "boxplot" Upper Inner Fence (UIF). Os resultados demonstram que mais de 70% da área do QF apresenta faixas de concentração relacionada aos valores do background geogênico para os elementos estudados. Cerca de 20% da área representam anomalias positivas, provavelmente relacionadas tanto a tipos de rochas próximas à superfície quanto à interferência humana. Anomalias antropogênicas distintas, notadamente das atividades de mineração, são identificadas em 5% a 10% de todas as amostras. Esta primeira amostragem feita no QF permitiu delinear um controle efetivo da litologia sobre a composição química dos sedimentos, estabelecer valores de referência para as principais bacias e demonstrar quais comunidades, cidades e bacias que estão expostas a riscos ambientais e por isso necessitam ser protegidas. ABSTRACTGeochemical mapping and the determination of baseline concentrations of potentially hazardous elements in the environment receive increasing attention. The need to know regional geochemical background data as well as the spatial allocation of areas with anomalous element concentrations and chances to identify their major sources motivate the interest. Here, results from a geochemical mapping exercise and derived related baseline values are presented. 541 stream sediment and surface waters samples have been collected across the Iron Quadrangle (IQ), Brazil, with a density of 1 sample per 13 km 2 . Geochemical maps were compiled using the inverse distance weighted (lDW) interpolation method. "Normal" background concentrations were distinguished from anomalies with the separation-by-concentrationrange technique, where positive anomalies were defined by the "boxplot" Upper Inner Fence (UIF) rule. The results demonstrate that more than 70% of the IQ area shows geogenic background concentration ranges for the elements studied. About 20% of the area represent positive anomalies, likely related to both near surface rock types and to human interference. Distinct anthropogenic anomalies, notably from mining activities are identified in 5-10% of all samples. Th...

show abstract

Statistical evaluation of stream sediment geochemistry in interpreting the river catchment of high-grade metamorphic terrains

Cited by 31 publications

References 16 publications

Preliminary investigation of pegmatites in Obudu Area, Southeastern Nigeria, using stream sediments geochemistry

Preliminary investigation of pegmatites in Obudu Area, Southeastern Nigeria, using stream sediments geochemistry

Iron Quadrangle stream sediments, Brazil: geochemical maps and reference values

Geochemical mapping of potentially hazardous elements in surface waters and stream sediments of the Quadrilátero Ferrífero, Brazil

Contact Info

Product

Resources

About