The Taurides region of Turkey is host to a number of important bauxite, Al-rich laterite, and Mn deposits. The most important bauxite deposits, Doğankuzu and Mortaş, are karst-related, unconformity-type deposits in Upper Cretaceous limestone. The bottom contact of the bauxite ore is undulatory, and bauxite fills depressions and …

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 associated Li content is higher in the sedimentary bauxite deposits formed in lagoonal-coastal swamp (445 μg/g ∼ 615 μg/g), while lower in the sedimentary bauxite deposits formed in coastal swamp (99.0 μg/g ∼ 240 μg/g), indicating that the salinity would affect the associated Li content (Liang, 2018).

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

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 …

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 …

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.

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 ...

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

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 …

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 …

Bauxite deposits are widespread in NW Sardinia. They formed during the middle Cretaceous, in consequence of a period of emergence of the Mesozoic carbonate shelf. In the Nurra area the geometries derived by the Middle Cretaceous tectonic phases controlled the ore typologies. Two bauxite profiles, laying on different bedrocks, were …

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

18. • Most of the Indian deposits are associated with laterite capping occurring as blankets on the plateau and hill ranges of the peninsular regions. However, occurrences of bauxite at lower levels are also common. •The major bauxite deposits of India occur in the central regions: •Plateau regions bordering Bihar and M.P. •Maikala …

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….

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

Bauxite is the primary ore of aluminum. Almost all of the aluminum that has ever been produced has been extracted from bauxite. The United States has a few small bauxite deposits but at least 99% of the bauxite used in the United States is imported. The United States is also a major importer of aluminum metal. Many people are surprised to learn ...

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 …

In bauxite deposits of Sardinia, dominant Early Paleozoic aged zircon grains (main age peaks at 291 – 295 Ma, 454 – 465 Ma, and 582 – 639 Ma) and their various Hf isotope compositions (εHf ...

A survey of Phanerozoic bauxite deposits identified five pronounced abundance peaks: (1) Middle Devonian–Mississippian, (2) Late Permian, (3) Late Triassic–Early Jurassic, (4) Late Cretaceous–Early Paleogene, and 5) Neogene (Bárdossy, 1982; Fig. 1).The dearth of pre-Middle Devonian bauxite deposits was likely due to the …

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 …

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 …

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 ...

Bauxites are traditionally considered to form via intense chemical weathering in hot and humid zones 1. Bauxite deposits …

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 …

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 Sar-Faryab bauxite deposit, which is situated in the Mandan anticline, is the largest and most important bauxite deposit in the ZSFMB. The deposit was discovered by geological and geophysical surveys and contains estimated reserves between 750,000 t and 3 Mt of bauxite ore grading 37 to 40% Al 2 O 3 ( Badri and …

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 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 …