ore genesis of bauxite
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- ore genesis of bauxite
Bauxite is the principal ore of aluminum. Bauxites vary physically according to the origin and geologic history of their deposits: some deposits are soft, easily crushed, and structureless; some are hard, dense, and …
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Mineral genesis and distinctive structures within bauxite ores. The genesis and relationship among various minerals in the karst bauxites reflect all the chemical effects during the entire ore-forming process. ... The presence of ooids and pisoids within the bauxite ore can be attributed to the original heterogeneity of colloids that originated ...
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The electrons in the current attach to oxygen and hydrogen, the other elements in . bauxite, leaving the aluminum. Ore Genesis. Earth contains a finite …
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The calculative results of Eu/Eu* ratio (Table 1) show that the values of bauxite ore (0.60 to 0.63) and ... Studies of mineral genesis have shown that the formation of diaspore includes supergene ...
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Bauxites containing 3–5% combined silica, less than 20% Fe 2 O 3 and more than 45–50% Al 2 O 3 are considered as bauxite ore (Valeton, 1972; Gow and Lozej, 1993), the main raw material of aluminum (Al). The ore minerals in bauxite comprise several forms of hydrated aluminum oxide: gibbsite, boehmite and diaspore (Gow and Lozej, 1993 ...
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Bauxite, rock largely composed of a mixture of hydrous aluminum oxides. Bauxite is the principal ore of aluminum. Bauxites vary physically according to the origin and geologic history of their deposits: some deposits are soft, easily crushed, and structureless; some are hard, dense, and pisolitic,
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This provides us a precious chance to explore the genesis of bauxite formed in an intracontinental setting without impact of simultaneous orogenesis in the marginal areas. ... (samples HFC-5 and -8) is composed of diaspore with subordinateanatase and illite (Fig. 5A). The clastic bauxite ore (Fig. 7A), corresponding to the uppermost zone of …
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In this contribution, we build on an existing study, and present new LA–ICP–MS data of elemental and sulfur isotopic compositions in pyrite from the Danping bauxite deposit to determine the ore-forming processes and constrain the ore genesis mechanisms, which will help in understanding other Permian bauxite deposit in the WZD …
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In this study, we present the main findings from microstructural and mineralogical studies and their implications for the genesis of bauxite/laterite in Mainpat plateau. Megascopic studies showed reddish laterite to off-white bauxite. Strong hydrolytic action formed small oolites and large pisolites with sizes of 1–2 cm in diameter. Pisolites …
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The East coast bauxite deposits of Odisha are well known in the mineral map of India. Some such deposits exposed at Nunapaimali, Sasubohumali and Baphlimali overlying khondalite of the Precambrian Eastern Ghats belt have been studied in respect of petrology, mineralogy and microstructure with a view to find out their genetic evolution. …
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The karstic bauxite deposits in the Xiuwen ore belt of Central Guizhou Province are hosted by the Lower Carboniferous Jiujialu Formation and show parallel unconformity with the overlying and underlying strata. The ore-bearing rock series that exhibits a typical "coal–bauxite–iron" structure is divided into three segments from the …
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The main bauxite ore bodies occur in the transition zone between the Cebireis Formation and Asmaca Formation. However, small-sized ore deposits such as karstic fillings are present within carbonate rocks of both formations. ... Genesis of bauxite bearing iron ore deposits from Payas (Hatay-Turkey) district. Bull. Mineral Res. Expl. …
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The genesis of the REE minerals, together with the occurrence of other minerals, indicates that intensively acidic and oxidizing conditions developed before the formation of the Permian bauxite ore. Towards the end of the Permian, the conditions became reducing and alkaline, favorable for the large-scale bauxitization.
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1. Introduction. Bauxites are residual aluminum deposits, derived from lateritic weathering of pre-existing alumosilicate rocks under tropical and/or subtropical climatic conditions, characterized by annual precipitation rates of 1,200 mm and annual temperatures above 22 °C (Bárdossy, 1982).Bauxite is the main aluminum ore and also represents an …
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Mineral phases reflect parental affinities and record all the chemical effects during the ore-forming processes, and many researchers have discussed the mineral genesis of karst bauxite (Bárdossy, 1982, Wang et al., 2012, Liu et al., 2013, Ahmadnejad et al., 2017, Vind et al., 2018, Yang et al., 2019).
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>5 billion tons of karstic bauxites were formed during the Late Carboniferous in the North China Craton (NCC). However, the metallogenic mechanism of bauxite is still obscure due to the unclear formation process of the main ore mineral, diaspore.We conducted geological, mineralogical, δ 34 S pyrite, and in-situ diaspore trace element …
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The bauxite ore in the middle part shows earthy and compact structure and clastic, oolitic, pisolitic texture, a white coloration (Fig. 7 B) and is mainly composed of diaspore with minor anatase (Fig. 5 B) The YFB, bauxite (sample YFB 01-4) developed on Silurian shale (YFB-1 profile) is compact (Fig. 7 C) and composed of diaspore with some ...
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Ore Geology Reviews. Volume 148, September 2022, 105056. Genesis of the Danping bauxite deposit in northern Guizhou, Southwest China: Constraints from in-situ …
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Based on ore genesis, bauxite is divided into two types, lateritic type and karst type. The former is mainly distributed in western Africa, north South America, India, Southeast Asia, northern and southwestern Australia, while the latter primarily occurs in …
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Raw bauxite ores sourced from India, Guinea, Ghana, and United States were characterized and compared in terms elemental and mineral composition, fluoride adsorption affinity and capacity, surface area, and equilibrium suspension pH [24]. Fig. 12.4 shows images of each bauxite ore as received (before milling), after milling, and with …
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The genesis of bauxite is closely related to carbonate or mafic basement and controlled by lithofacies paleogeography, paleoclimate, palaeogeomorphology and other factors. ... We assessed bauxite ...
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During the epigenetic alteration of boehmitic karstic bauxite in the Vlasenica region of Yugoslavia, which was caused by siliceous water descending through the deposit by means of cracks, fissures, etc., oolites were less altered compared with the coexisting matrix material, which was intensely kaolinized. The following zonal alteration pattern of …
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Bauxite: as petrographic term is a residual sedimentary rock product of tropical chemical weathering in which the free aluminium bearing minerals (alumina hydroxide and oxy-hydroxides) such: gibbsite, boehmite and diaspore attain min. 50% as shown in Fig. 2.1.There are bauxitic deposits, such as, Darling Range—Western …
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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 overlying the alkali basalt and tholeiite were derived from weathering of underlying basalt, however, the origin of bauxite deposit overlying the sandstone …
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In the Guangou bauxite deposit, three layers, i.e., ferric clay, bauxite ore, and top clay, were divided from bottom to top in the lower member of the Benxi Formation (Fig. 2).In some outcrops uncovered by mining, the underlying argillaceous limestone in the Majiagou Formation was observed to change into red-colored, relatively loose semi …
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Six bauxite ore samples, 6 clay samples from both underlying and overlying clayey layers, as well as carbonate samples from the rock units below and above the deposits, were collected from two profiles (Fig. 2, Fig. 3). ... southeastern margin of Tibet, and implication for the genesis of ancient karst bauxite. Sedimentary Geology, Volume …
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Our results also have implications for iron (Fe)-ore genesis in the QF. This study demonstrates that in situ U–Th–Pb-isotope analyses of rutile can place tight constraints on the age and ...
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Three bauxite horizons are intercalated within shallow water limestones. They are named B1, B2 and B3 from bottom to top. In this study we present the characteristics of the B3 horizon (Cenomanian-Turonian) sampled in Agia Anna, Variani and Shila 1 underground mines. The bauxite ore has a prevailing oolitic texture.
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It found that, Bauxite ore is main source of both aluminum (Al), and aluminum oxides (Al2O3). these products have larger applications in our daily life, …
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Mineralogical and geochemical evolution of the Bidgol bauxite deposit, Zagros Mountain Belt, Iran: Implications for ore genesis, rare earth elements fractionation and parental affinity. Ore Geol. Rev. ... The Al 2 O 3 (53–76.8 wt.%) is the main chemical contents of the bauxite ore samples in the Lindai district, followed by SiO 2, Fe 2 O 3 ...
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After the bauxite ore horizons are exposed in the surface environment, impurities (primarily Fe and Si) are removed from the profiles, and Al is enriched; the clay …
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The bauxite ore and bauxite clay sample plot mainly between karst bauxite and high‑iron lateritic bauxite, ... Iran: Implications for ore genesis, rare earth elements fractionation and parental affinity. Ore Geol. Rev., 86 (2017), pp. 755-783. View PDF View article View in Scopus Google Scholar. Akinci and Artir, 2008. A. Akinci, R. Artir.
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