Mineralogical and geochemical investigations of the Dajia Salento-type bauxite deposits, western Guangxi, China

Liu, Xuefei; Wang, Qingfei; Deng, Jun; Zhang, Qizuan; Sun, Silei; Meng, Jianghui

doi:10.1016/j.gexplo.2010.04.012

Cited by 106 publications

(42 citation statements)

References 46 publications

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“…The internal microstructure features which will cease to exist and will become micromass clay with gibbsite crystals immersed in a kaolinite matrix. The kaolinite in this study coexists with gibbsite nodules, suggesting kaolinite is the product of the in situ epigenetic replacement of alumina in gibbsite by dissolved silica, similar to the process proposed by Dangić (1985) and Liu et al (2010). Following the formation of this micromass, the aggregation of blocks occurs with a porphyric type structure that is separated by fissure pores that exhibit illuviation features, with micromass as the filling material and not detritus of allochthonous origin.…”

Section: Resilication Process and Its Indicatorssupporting

confidence: 79%

“…This behavior suggests that the Al is in the form of gibbsite at the base of the profile. As gibbsite destabilizes, the free Al 3+ increases in the soil solution, suggesting an in situ epigenetic replacement of alumina in gibbsite by dissolved silica, similar to the process proposed by Dangić (1985) and Liu et al (2010). Thus, the release of Al 3+ is a direct consequence of the resilication process.…”

Section: Resilication Process and Its Indicatorssupporting

confidence: 61%

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Genesis of Soils from Bauxite in Southeastern Brazil: Resilication as a Soil-Forming Process

Mateus

Oliveira

Varajão

et al. 2017

Rev. Bras. Ciênc. Solo

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Pedological studies using X-ray diffraction (XRD), X-ray fluorescence (XRF), optical microscopy, and scanning electron microscopy (SEM-EDS) showed a Xanthic Ferralsol formed from the degradation of bauxite on a slope in the Caparaó region, in southeastern Brazil. We found a decrease in the number and size of bauxite fragments toward the top of the profiles, bauxite fragments that were more degraded at the top of the profiles, transformation of gibbsite into kaolinite, and absolute enrichment in silicon in the mass balance. These indicators suggest that resilication could be the major process responsible for formation of the soil; detailed studies are needed to verify the origin of the silica. The reintroduction of silica into the system occurs by the biogeochemical cycling of vegetation and, in some cases, water table fluctuations, highlighting the role of resilication as a soil-forming process in bauxite-derived soils.

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Section: Resilication Process and Its Indicatorssupporting

confidence: 79%

Section: Resilication Process and Its Indicatorssupporting

confidence: 61%

Genesis of Soils from Bauxite in Southeastern Brazil: Resilication as a Soil-Forming Process

Mateus

Oliveira

Varajão

et al. 2017

Rev. Bras. Ciênc. Solo

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“…Previous work showed that the values of Zr/Hf and Nb/Ta of parent rocks and bauxite deposit exhibit a linear correlation, Zr and Hf, Nb and Ta usually present simliar degree of enrichment or lost in metallogenesis. Zr and Hf may be enriched in zircon, while Nb and Ta are stable element pair in metallogenesis [30].…”

Section: Analysis Methods Of Provenance Of Bauxite Depositmentioning

confidence: 99%

“…Many domestic scientists have successfully applied REE tracer in to practice: Taylor and Mclennan (1985) established a "Taylor Model" of REE to trace provenance, distinguished different provenances of river sediments, and plutonic, metamorphic and migmatite rocks in soil [35]. The REE chondrite distribution curve of karst type bauxite deposit in Guangxi is basically the same with that of the underlying carbonate rocks [30]. REE curve characteristics of bauxite deposit in Turkey not only indicate the provenance of underlying limestone, but also reflect chemical condition of mineralization environment [36].…”

Section: Analysis Methods Of Provenance Of Bauxite Depositmentioning

confidence: 99%

Analysis of Provenance Trac ng Methods Of Baux te Depos t

Cui¹

2015

Advances in Social Science, Education and Humanities Research

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Abstract. Research on provenance of bauxite deposit is a difficult topic throughout the world, based on the domestic and foreign latest researches, analysis methods of provenance of bauxite deposit are discussed here, which includes zircon provenance tracing, Harker Diagrams of major elements, trace element analysis, REE tracer and heavy minerals tracer. Bauxite deposits are of multi-sources, rare of them yielded from the single parent rock. Therefore, it should be a multi-method approaching to recognize the source of bauxite, including analysis of mineral assemblages and geochemistry, and in combination of regional paleogeographic and tectonic evolution. A comprehensive analysis of all possible sources of bauxite is necessary to avoid a one-sided consequence.

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“…differential thermogravimetric (TG/DTG) analysis, and the resulting curves indicated four decomposition stages: evaporation of adsorbed water, gibbsite decomposition, goethite decomposition and diaspore dehydroxylation [13,14]. Liu et al [15] demonstrated that diaspore, hematite and kaolinite are the main mineral components in Dajia Salento-type bauxite, with lesser concentrations of anatase, chamosite, gibbsite, goethite, illite, zircon, quartz and pyrite, and that the diaspore is primarily formed under reducing conditions. The magmatic rocks associated with the Emeishan plume in western Guangxi and the carbonates in the Maokou formation are the main sources of materials for the bauxite formation.…”

Section: Introductionmentioning

confidence: 99%

Mineralogical and thermal characteristics of low-grade Jinlong bauxite sourced from Guangxi Province, China

Wang

Xing

Zhang

et al. 2015

J Therm Anal Calorim

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Characteristic samples from the No. 1 ore body of the Jinlong bauxite deposit in Guangxi Province, China, were assessed to determine their chemical composition using whole-rock geochemical analysis, their mineral components using X-ray diffraction, their thermal characteristics via differential thermal analysis, thermogravimetry and differential thermogravimetry, and their dissemination characteristics by scanning electron microscopy/energydispersive spectrometry. The results show that the average Al 2 O 3 content in the Jinlong bauxite deposit is 41 % and that the Al 2 O 3 /SiO 2 ratio is approximately 2.17, and thus, the ore may be defined as low-grade bauxite. The main minerals found in the ore were diaspore (20.3-43 %), gibbsite, clays and hematite. In differential thermal analysis results, the bauxite samples exhibit two distinct endothermic peaks, with the dehydration of gibbsite occurring in the 200-260°C range and the dehydration of diaspore occurring in the 524-550°C range. Thermogravimetry and differential thermogravimetry indicate four decomposition stages: evaporation of adsorbed water (50-160°C), gibbsite decomposition (190-280°C), goethite decomposition (190-280°C) and diaspore dehydroxylation (460-580°C). The diaspore belongs to the orthorhombic dipyramidal class and exists primarily in three dissemination forms-euhedral and subhedral grain, bean and oolitic shaped, and aphanitic and microcrystalline aggregates, and is always accompanied by kaolinite and pyrophyllite.

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Mineralogical and geochemical investigations of the Dajia Salento-type bauxite deposits, western Guangxi, China

Cited by 106 publications

References 46 publications

Genesis of Soils from Bauxite in Southeastern Brazil: Resilication as a Soil-Forming Process

Genesis of Soils from Bauxite in Southeastern Brazil: Resilication as a Soil-Forming Process

Analysis of Provenance Trac ng Methods Of Baux te Depos t

Mineralogical and thermal characteristics of low-grade Jinlong bauxite sourced from Guangxi Province, China

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