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 …
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.
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,
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 …
The electrons in the current attach to oxygen and hydrogen, the other elements in . bauxite, leaving the aluminum. Ore Genesis. Earth contains a finite …
More than 0.5 billion tons of late Permian bauxite overlies the karstic topography of the Maokou Formation of western Guangxi in China. Here, we provide new mineralogical, geochemical, Sr–Nd–Pb isotopic, and pyrite S isotope and trace element compositional data for the Pingguo bauxite deposit, aiming to further our understanding …
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 …
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 …
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 southern Europe, Caribbean region, western Asia and China.
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 ...
>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 …
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. …
Initial investigations have provided a first insight into the geology and conditions of lateritic bauxite deposits formation in the WZD area (Jin et al., 2009, Liu, 2007, Wu et al., 2006, Wu et al., 2008, Liu et al., 2010a, Yin, 2009).However, the detailed ore-forming process is still ambiguous and the source rock of the WZD bauxite deposits has long …
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. …
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 ...
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 ...
The genesis of the Quaternary bauxites is a unique process that involved not only the ... Orebody vertical structure and implications …
Ore Geology Reviews. Volume 148, September 2022, 105056. Genesis of the Danping bauxite deposit in northern Guizhou, Southwest China: Constraints from in-situ …
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 ...
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 …
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 …
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 …
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, …
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. (2017) M.G. Babechuk et al. ... and implication for the genesis of ancient karst bauxite. Sedimentary Geology, Volume 373, 2018, pp. 292-306.
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 …
Bauxite is the principal ore of aluminum. The first step in producing aluminum is to crush the bauxite and purify it using the Bayer Process. In the Bayer Process, the bauxite is washed in a hot solution of sodium hydroxide, which leaches aluminum from the bauxite. The aluminum is precipitated out of solution in the form of aluminum hydroxide ...
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 ...
The Iranian karst bauxite deposits are mainly low-grade aluminum ores. The Jajarm deposit in the AMC with reserves of more than 19 Mt of bauxite ores at an average Al 2 O 3 /SiO 2 ratio of 43/14 (Esmaeily et al., 2010) and the Sar-Faryab deposit in the ZSFB with reserves between 750,000 t and 3 Mt of bauxite ores grading 37 to 40 wt% Al 2 O 3 …
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.
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 …