Structural-morphological features of kaolinite from clayey rocks subjected to different stages of lithogenesis: Evidence from the Voronezh anteclise

Бортников, Н. С.; Новіков, В. М.; Savko, A. D.; Боева, Н. М.; Жегалло, Е. А.; Bushueva, E. B.; Крайнов, Алексей Владимирович; Dmitriev, Dmitry A

doi:10.1134/s0024490213050039

Cited by 12 publications

(2 citation statements)

References 6 publications

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“…The kaolinic particles are rolled with rough edges and some individual' particles have lamellar shape indicating a terrigenous origin (Figure 2b and c). Bortnikov et al [37], reported that terrigenous kaolinite is consists of lamellar particles and remains of differently preserved vermicular crystals. Kaolinite particles are arranged face to face and individuals show well defined crystalline pseudo-hexagonal and rough edges indicating detrital origin (Figure 3b and c).…”

Section: Mineralogy and Surface Morphologymentioning

confidence: 99%

Mineralogy and Geochemistry of Shales of Mamu Formation in Nigeria: Effects of Deposition, Source Rock, and Tectonic Background

Akinyemi¹,

Adebayo²,

Madukwe³

et al. 2022

Geochemistry and Mineral Resources

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Study of lithofacies identification, geochemical characterization of shales is vital to the provenance, paleoweathering, and tectonic setting reconstruction. The combination of morphological analysis, bulk chemical analysis and in-situ multi-element analysis was used to investigate the provenance, source area weathering, and depositional setting of outcropped Maastrichtian shale sequence of the Mamu Formation, Anambra Basin in Nigeria. Ten representative shale samples were examined by scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS). Geochemical analysis was performed by X-ray fluorescence (XRF) Spectroscopy and Laser Ablation-Induced Coupled Plasma Mass Spectrometry (LA-ICPMS) techniques. The structural and morphological development of kaolinite in the outcropped shale samples of Mamu Formation is due to mechanical disintegration during transportation and re-deposition. Major oxides such as SiO2, Al2O3 and Fe2O3 constitute greater than 86% of the bulk composition. The weathering indices suggest highly weathered source materials. The plot of Cr versus Ni indicated the studied samples are Late Archean shale. Binary plots of trace elements suggest derivation from acidic or felsic sources rather than intermediate or basic source rocks. Ternary plot of Na2O + K2O, SiO2/10 and CaO + MgO indicated multiple sources such as felsic igneous rocks or recycled residues of quartz-rich. Tectonic discrimination diagram depict a typical Passive Margin field.

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Section: Mineralogy and Surface Morphologymentioning

confidence: 99%

Mineralogy and Geochemistry of Shales of Mamu Formation in Nigeria: Effects of Deposition, Source Rock, and Tectonic Background

Akinyemi¹,

Adebayo²,

Madukwe³

et al. 2022

Geochemistry and Mineral Resources

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“…However, the glossy sheen observed in the SEM micrographs is reportedly also due to clay minerals such as kaolinite, quartz, and other metallic minerals in the AFZ coal structure. The white coloured, rounded or exfoliated grains in the SEM image indicate the occurrence of quartz; whereas the irregularly shaped grains denote the presence of kaolinite along with Ti and Fe metal elements (Sengupta et al, 2008;Bortnikov et al, 2013). Next, the composition of metal and non-metallic elements present in the AFZ coal structure were then determined by charge balance as shown in Table 1.…”

Section: Chemical Analysismentioning

confidence: 99%

Thermal Oxidative and Non-Oxidative Degradation Behaviour of Afuze Coal

Nyakuma¹

2021

Preprint

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This study presents a preliminary analysis of the chemical and thermal fuel properties of Afuze (AFZ) coal extracted from coalfields in Owan East Local Government Area of Edo State, Nigeria. The chemical properties of AFZ were examined by combined scanning electron microscopy-energy dispersive X-ray (EDX), whereas the thermal properties were deduced by thermogravimetric analysis (TGA) under flash (50 °C/min heating rate) oxidative (combustion) and non-oxidative (pyrolysis) conditions. The microstructure and morphology analysis of AFZ revealed has a compact structure comprising small-to-large, irregular shaped and exfoliated grains with a vitreous appearance typically ascribed to metal elements (Ti and Fe) kaolinite, quartz, and other clay minerals. Chemical analysis revealed carbon, oxygen, aluminium, silicon, sulphur, calcium, titanium, and iron in major and minor (trace) quantities. Thermal analysis under oxidative and non-oxidative conditions revealed degradation occurs in three stages, namely; drying or demineralisation, devolatilization or maceral degradation and the formation of char/coke or ash. Lastly, the findings showed that the temperature range for the oxidative thermal degradation process (338.58 - 756.76 °C) was higher than the non-oxidative process (378.43 - 615.34 °C). This observation can be explained by the exothermic nature of the oxidative (combustion) process, which ensures greater heat supply required to thermally soften or degrade the maceral coal components. Overall, the oxidative process yielded the residual mass (RM = 21.97%) and mass loss (ML = 78.03%). The lower ML (49.03%) but higher RM (50.97%) observed during non-oxidative degradation of AFZ could be ascribed to the largely endothermic nature of the process.

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Extraction and Characterisation of Natural Fibres from Imperata cylindrica: Morphological, Microstructural, Thermal, and Kinetic Properties

Nyakuma

Oladokun

Ogunbode

et al. 2022

Journal of Natural Fibers

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Structural-morphological features of kaolinite from clayey rocks subjected to different stages of lithogenesis: Evidence from the Voronezh anteclise

Cited by 12 publications

References 6 publications

Mineralogy and Geochemistry of Shales of Mamu Formation in Nigeria: Effects of Deposition, Source Rock, and Tectonic Background

Mineralogy and Geochemistry of Shales of Mamu Formation in Nigeria: Effects of Deposition, Source Rock, and Tectonic Background

Thermal Oxidative and Non-Oxidative Degradation Behaviour of Afuze Coal

Extraction and Characterisation of Natural Fibres from Imperata cylindrica: Morphological, Microstructural, Thermal, and Kinetic Properties

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