This study used TEM to investigate the nano-geochemical characteristics of nanoparticles and nano-mineral particles in the Jingxi bauxite deposit. This work provides nanoscale information for in-depth research on bauxite, contributing to a better overall …

The provenances of some bauxite deposits in the data set are not clear or are considered to be a mixture source. In order to better reflect the impact of provenance differences on TiO2 content, we ...

Ostalo. New Data on the Stratigraphic Position, Mineralogy and Chemistry of Nanos Bauxite Deposits and Adjacent Carbonate Rocks, Slovenia (DISCUSSION)

The Nanos deposits are an exam- ple of bauxites deriving from limestone residuum, aeolian material and alluvium. Some Jurassic marly, calcareous rocks proved relative- ly …

Geochemical characteristics of the karst-type bauxites: an example from the Kanirash deposit, NW Iran. The Kanirash bauxite deposit belongs to the Iran-Himalayan karst-type bauxite belt, which is situated about 30 km southeast of Mahabad city, northwestern Iran. The bauxite ores are embedded by the….

The bauxite deposits contain mainly Al 2 O 3 (40–69 wt.%), Fe 2 O 3 (3–10 wt.%), SiO 2 (0.16–7 wt.%) and other elements occur in quantities not substantial to affect the quality or processing of the bauxite, and are attributed to the presence of relic minerals. Gibbsite makes up to 98 vol.% of the bauxite ore in special cases.

Bauxite deposits of karst type are well known in the Parnassos–Ghiona mountains [ 3, 4, 5, 6, 7] and Montenegro (Adriatic zone coastal area), belonging to the …

1. Introduction. Lateritic bauxite deposits provide >90% of the world's aluminum consumption (Ling et al., 2017).They are residual deposits formed during in situ chemical weathering of a bedrock rich in alumino-silicate minerals (Bárdossy, 1990, Hou et al., 2017).Lateritic bauxites constitute ~85% of the world's bauxite deposits, with the …

The bauxite deposits occur along the Lower Kimmeridgian-Upper Kimmeridgian contact in the Nanos area. The main bauxite minerals are boehmite and gibbsite. The Nanos deposits are an example of bauxites deriving from limestone residuum, aeolian material and alluvium. Some Jurassic marly, calcareous rocks proved …

Nanogeochemistry of karst-type Bauxite from Jingxi, Guangxi, China: Revealing a new occurrence of Al, Si, Ti, Fe, and C by nanoparticles in karst-type …

The bauxite deposits occur along the Lower Kimmeridgian-Upper Kimmeridgian contact in the Nanos area. The main bauxite minerals are boehmite and gibbsite. The Nanos deposits are an example of bauxites deriving from limestone residuum, aeolian material and alluvium. Some Jurassic marly, calcareous rocks proved relatively high in alumina, …

Palaeo weathering during the Cretaceous–Eocene interval is most favorable for bauxitization, i.e., transport and deposition in traps on the karstified surfaces of the Mediterranean karst bauxite belt, including the Parnassos–Ghiona bauxite deposit. Resources of lithium (Li), a critical metal of strategic significance in karst-type bauxite …

The Parnassos-Ghiona bauxite deposit in Greece of karst type is the 11th largest bauxite producer in the world. The mineralogical, major and trace-element contents and δ 18 O, δ 12 C, δ 34 S isotopic compositions of bauxite ores from this deposit and associated limestone provide valuable evidence for their origin and biogeochemical …

The bauxite deposits of Guinea-Bissau were considered to be sub-economic because of ecological sensitivity of the surrounding Boe National Park [64]; and of the economic uncertainties about mining it in relation to the underdeveloped nature of the region, where the impoverished Buba port is located. Thus the cost of road haulage and …

The extensive bauxite deposits of the Weipa region, northern Queensland, are a loose agglomeration of nodules, pisoliths, ooliths and fine material, with a mean particle size of 5 mm. Only about 5 ...

Model 38b DESCRIPTIVE MODEL OF LATERITE TYPE BAUXITE DEPOSITS By Sam H.Patterson APPROXIMATE SYNONYM Aluminum ore (Patterson,1967). DESCRIPTION Weathered residual material in subsoil formed on any rock containing aluminum. GENERAL REFERENCE Patterson (1984). GEOLOGICAL ENVIRONMENT Rock Types Weathered …

In the Bidgol bauxite deposit pisoids and ooids are harder and larger than other studied bauxites and are characterized by a large diaspore core followed by a thin cortex of Al-hematite (Fig. 4 e; Ahmadnejad et al., 2017), whereas in the Tang-e Pirzal deposit occurs a layer characterized by boehmite ooidal concretions accompanied by …

However, we report a range for bauxite deposits of <10 to 812 ppm, with an average Ga concentration of 57 ppm (table 1). Lateritic bauxites have Ga concentrations that range from below detection (< 8 ppm) to 146 ppm, with an average of 57 ppm. Karst-type bauxite deposits have Ga concentrations that range from 6.3 to 812 ppm, though the upper

1. Introduction. Bauxite deposits can be classified into three main groups: lateritic-, tikhvin- and karstic-types (Bárdossy, 1982, Bárdossy and Aleva, 1990).The lateritic-type bauxites are residual deposits derived from the underlying alumosilicate rocks and are directly related to the underlying source rocks by their preserved textures and …

The bauxite deposits of the Zagros orogenic belts in southwestern Iran were deposited during two periods: (1) in karst cavities at the boundary between the Sarvak and Ilam Formations (Cretaceous ...

1. Introduction. Bauxite ore is the main source for Al in the world (Bray, 2017).Karst bauxites—characterised by a strong association with a carbonate host (Bárdossy 1982) and representing 14 % of the bauxite resources worldwide (Mameli et al., 2007)—have gained interest recently also because of their capacity to accumulate rare …

The Boloven bauxite deposit occurs either in the weathered basalt (alkali basalt and tholeiite), or in the Cretaceous sandstone. It is generally agreed that the bauxite deposits/laterites ...

The main mineralogical and geochemical characteristics of the Parnassos-Ghiona bauxite deposits have been reported in numerous studies using various …

Detailed Description. World map showing distribution of bauxite deposits (sources of gallium). This is Fig. 1 from Compilation of gallium resource data for bauxite deposits: U.S. Geological Survey Open-File Report 2013–1272.

This study utilizes the Random Forest (RF) model to analyze geochemical data sets compiled from three bauxite provinces in the Tethys, including the Mediterranean, Central Asian, and Chinese provinces. Meaningful variables among the provenance, paleolatitude and tectonic setting that affected the formation of the bauxite deposits are …

The current classification of bauxite deposits divides them into three main genetic types, depending on the mineralogy, geochemistry and host lithology: 1) Lateritic-type bauxites contain gibbsite as the main hydrated aluminium oxide, are generally residual deposits derived by in situ and direct lateritization (autochthonous) of aluminosilicate ...

The Huri bauxite deposit is located 40 km northwest of Maragheh City, East Azerbaijan province, northwestern Iran. Bauxite horizons at Huri develop within karstic depressions and sinkholes of carbonate footwalls of the Ruteh Formation, overlain by carbonate of the Elika Formation. Powder X-ray diffraction (PXRD) and scanning electron …

High grade bauxites are scarce and most of the deposits are kaolinitic bauxite or bauxitic clays. The reserves were estimated by about 1.28 m.t., distributed in various karst deposits, and have been used in alum production and refractories, with limited laboratory experiments in alumina extraction. Download Free PDF.

The bauxite deposits occur along the Lower Kimmeridgian-Upper Kimmeridgian contact in the Nanos area. The main bauxite minerals are boehmite and gibbsite. The Nanos …

After many millions of years what is left is called a "laterite", which can be either iron-rich, or in extreme cases, aluminium-rich. Most of the world's aluminium is mined from lateritic bauxite deposits. The …

In laterite deposits three main types are introduced namely: (1) plateau type deposits developed on morphological terraces and low land interfluves, (2) whale back …

Key-words: Bauxite deposits, Bauxite-bearing sedimentary basin, Kljuihe rijefi: LeZiSta boksita, Boksitonosno-sedimentacijski Upper-Cretaceous mdist limestones, Prornina formation clastic bazen, Gornjokredni rudistni vapnenci, Klastiti Promina formacideposits, Paleorelief, Tectonic-erosional discordance, Shallow seije, Paleoreljef, …