The use of unmixing technique in stream sediment geochemical exploration

Shahrestani, Shahed; Mokhtari, Ali; Fatehi, Moslem

doi:10.1016/j.gexplo.2019.106339

Cited by 9 publications

(8 citation statements)

References 48 publications

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“…Stream sediment geochemistry is based on the fact that samples collected from the active channel and the overbank of a stream represent the products of weathering upstream from the sampling site (Nude & Arhin, 2009;Shahrestani et al, 2020). The discriminant function diagram (Roser & Korsch, 1988;Fig.…”

Section: Sediment Provenance and Transportationmentioning

confidence: 99%

“…Stream sediment samples collected from the active channel and overbank of a stream in the drainage channels are composite products originating from the upstream lithological units as a result of weathering and erosion processes (Nude & Arhin, 2009;Shahrestani et al, 2020). They are more characterized by their variability than their uniformity in composition, grain size, sorting, and color, which depend on the geology, terrain, and climate of the catchment areas sampled by the stream.…”

Section: Introductionmentioning

confidence: 99%

“…Their geochemical study provides reliable information on the sediments origin and the weathering conditions of the source areas. They can ease the study of the geological and geomorphological environment of tropical humid environments (Shahrestani et al, 2020). Anthropogenic activities (urbanization and mining) can change the geochemistry, especially rare-earth element pattern of stream sediments (Mimba et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Rare-earth elements are used as powerful markers of fundamental geochemical processes due to their similar physicochemical properties (Leybourne & Johannesson, 2008). According to several authors (e.g., Shahrestani & Mokhtari, 2017;Shahrestani et al, 2020), the geochemistry of stream sediments is the most effective tool in the preliminary geochemical exploration of mineral deposits.…”

Section: Introductionmentioning

confidence: 99%

“…In some rivers of Eséka region, alluvial gold is worked by artisanal miners since November 2017 and the primary source of the gold is not yet identified, as well as the alluvial extend. Stream sediment geochemical surveys work well where stream drainage systems are developed (Shahrestani et al, 2020). This paper discusses surface processes in Eséka area using the mineralogical and geochemical data of stream sediments and carries out a preliminary survey of Au, Pd and Pt.…”

Section: Introductionmentioning

confidence: 99%

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Geochemistry of stream sediments from Eséka area (SW Cameroon): implications for surface process assessment and precious metals (Au, Pd, and Pt) exploration

Sababa

Mbesse

Mouko

et al. 2021

J. Sediment. Environ.

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Stream sediment geochemical data from SW Cameroon were examined as a contribution for surface process study and preliminary exploration of Au, Pd, and Pt. Samples were collected from both active and overbank stream sediments. Samples were analyzed for mineralogy, major and trace elements including rare-earth elements, and Au, Pd, and Pt concentrations. The sediments are mainly made up of quartz, gibbsite, goethite, and kaolinite. Their chemical composition is dominated by SiO 2 , Al 2 O 3 , and Fe 2 O 3 . They are geochemically classified as Fe-sand and derive from moderate to intense weathered sources which are the local surrounding rocks. Variability in the chemical composition could be attributed to weathering and hydrodynamic sorting of sediments during transport. Trace and rare-earth elements are sparsely present in river sediments in the Eséka area. The high Zr contents could reveal high proportion of zircon as a resistant mineral to weathering. The normalized REE patterns show relative HREE enrichment due to the fact that zircon preferentially incorporates HREE. The variable La/ Sc, La/Co, Th/Sc, Zr/Cr, LREE/HREE ratios, and Eu-anomalies suggest that the stream sediments may have originated from mixed felsic and mafic source contributions. Gold, Pd, and Pt have variable contents with the highest contents in the active stream samples. The active stream sediments are the appropriate tools for geochemical Au surveys in humid forest regions. Despite the low contents in stream sediments, some sampling points are favorable for further Au, Pd, and Pt exploration in their upstream sources. The clayey materials should be favorable for Pd and Pt accumulations.

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Section: Sediment Provenance and Transportationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%