Mineralogical and geochemical investigations of the Mombi bauxite deposit, Zagros Mountains, Iran

Zamanian, Hassan; Ahmadnejad, Farhad; Zarasvandi, Alireza

doi:10.1016/j.chemer.2015.10.001

Cited by 46 publications

(19 citation statements)

References 64 publications

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“…These correlations are typical of strongly weathered deposits where immobile elements accumulate and mobile elements are leached out [35]. This is also confirmed by the low contents of alkali and alkali earth elements, which are highly mobile during chemical weathering [36,37]. (Figures 7a to 7g), indicating that Al and Fe oxides and oxihydroxides mineral phases exercise significant control over trace metals.…”

Section: Mineralogical Composition and Textural Featuressupporting

confidence: 57%

“…These correlations are typical of strongly weathered deposits where immobile elements accumulate and mobile elements are leached out [35]. This is also confirmed by the low contents of alkali and alkali earth elements, which are highly mobile during chemical weathering [36,37]. Binary plots among the major elemental oxides ( Figure 6) indicate that, in the studied deposit, positive correlations exist between Al 2 O 3 and TiO 2 , and between Al 2 O 3 and Fe 2 O 3 , whereas negative correlations exist between Al 2 O 3 and SiO 2 and Al 2 O 3 and CaO.…”

Section: Mineralogical Composition and Textural Featuressupporting

confidence: 54%

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Mineralogical and Geochemical Features of Cretaceous Bauxite from San Giovanni Rotondo (Apulia, Southern Italy): A Provenance Tool

Sinisi

2018

Minerals

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In this study, the mineralogical and chemical compositions of bauxite from San Giovanni Rotondo (SGR) on the Gargano Promontory (northern Apulia, Italy) are presented and discussed with the aim of assessing the nature of its source material. Bauxite from the SGR, which is known as the “Montecatini mine”, was exploited intensively until the 1970s to recover alumina. As with most of the autochthonous peri-Mediterranean bauxites, the studied deposit is a karst bauxite with a massive, matrix-supported texture and an oolitic structure. Boehmite and hematite are the main mineral phases, and anatase, rutile, and kaolinite are present in lesser amounts along with detrital zircons and monazite grains. Calcite is abundant only in the deposit’s lower portion, triggering a significant dilution effect on trace element concentrations. However, with respect to the average crust and chondrite compositions, strong enrichments of trace metals (up to 10X Upper Continental Crust’s (UCC)) and rare earth elements (REEs, up to 800X chondrite) exist throughout the studied deposit. The distribution of REEs, the (La/Yb)N and Eu/Eu* ratios, and an Eu/Eu* versus Sm/Nd diagram have been used for determining the bauxite’s provenance. These geochemical proxies point to a parental material consisting of a mixture of distant magmatic and siliciclastic components.

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Section: Mineralogical Composition and Textural Featuressupporting

confidence: 57%

“…These correlations are typical of strongly weathered deposits where immobile elements accumulate and mobile elements are leached out [35]. This is also confirmed by the low contents of alkali and alkali earth elements, which are highly mobile during chemical weathering [36,37]. Binary plots among the major elemental oxides ( Figure 6) indicate that, in the studied deposit, positive correlations exist between Al 2 O 3 and TiO 2 , and between Al 2 O 3 and Fe 2 O 3 , whereas negative correlations exist between Al 2 O 3 and SiO 2 and Al 2 O 3 and CaO.…”

Section: Mineralogical Composition and Textural Featuressupporting

confidence: 54%

Mineralogical and Geochemical Features of Cretaceous Bauxite from San Giovanni Rotondo (Apulia, Southern Italy): A Provenance Tool

Sinisi

2018

Minerals

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“…Bauxite deposits that occur in limestones have been defined as karstic deposits, regardless of their parent rocks (Patternson, 1967;Bárdossy, 1982;Bardossy and Aleva, 1990). On the other hand, bauxite deposits that overlay alumosilicate rocks and were formed by their in situ lateritization are called laterite-type or silicate-type deposits (Bardossy and Aleva, 1990;D'Argenio and Mindszenty, 1995;Öztürk et al, 2002;Liu et al, 2010;Wang et al, 2011;Yu et al, 2014;Mongelli et al, 2016;Zamanian et al, 2016;Liu et al 2016;Torro et al, 2017;Yang et al;. As can be seen from the above classification, while lateritic-type or silica-type bauxite classification depends on the parental rock, the karstic-type is independent of the source rock.…”

Section: Comparison With World Bauxitesmentioning

confidence: 99%

Formation of Ti-rich bauxite from alkali basalt in continental margin carbonates, Payas region, SE Turkey: implications for sea level change in the Upper Cretaceous

Öztürk¹,

Hanilçi²,

Cansu³

et al. 2021

Turkish J Earth Sci

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The Payas region bauxite deposits occur as a sandwiched layer that is a few kilometers long and an average of 10 m thick between the lower and upper Cretaceous carbonates of the Arabian Platform. The bauxites occur as blanket and pocket types, are chemically and texturally homogeneous and have a thrust structure with ophiolitic mélange formations. The bauxite varies in color, from reddish-brown to grayish-green to black, and has a massive, patchy and very rare oolitic-pisolitic texture. The bauxite mainly consists of diaspore, hematite, rutile, anatase, rare kaolinite, boehmite and pyrite minerals. Prismatic and lath-shaped euhedral rutile within the bauxites indicates in situ formation of the bauxites from Ti-rich basaltic pyroclastics. The chondrite-normalized REE pattern of the bauxite is similar to the basalt pattern and has a very weak Eu anomaly (0.9). Two groups of elements have been enriched in the Payas region bauxite: the first group contains TiO 2 (9.67 wt%), Cr (752 ppm), V (617 ppm) and Ni (72 ppm), and the second group comprises Zr (993 ppm), Nb (86 ppm) and Sn (7 ppm). These two groups of element enrichment indicate that the parental material of bauxite has an alkali basalt character. The carbon and oxygen isotope stratigraphy throughout the carbonate section from the bottom to the top indicates that the climate was warm during bauxitization (mean δ 18 O VPDB :-6.15‰) and relatively cold after bauxite deposition (mean δ 18 O VPDB :-4,71‰). A marine regression during the warm climate could be related to the uplifting of the coastal zone, which is linked to vertical fault movements of normal faults. A rapid transgression after bauxite formation during the cold climate period can be explained by subsidence of the continental margin, which is associated with episodic ophiolitic nappe loading during the closure of the Neotethyan Ocean in the region.

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“…lack or minor of hematite component (BÁRDOSSY, 1982;GU et al, 2013); d). presence of major kaolinite and/or quartz and/or carbonates and/or some other constituents (BÁRDOS SY, 1982;ZARASVANDI et al, 2012;ZAMANIAN et al, 2016); and/or e). different stratigraphic origin (BÁR DOSSY, 1982;ABEDINI et al, 2008;LING et al, 2017;ZHANG et al, 2017).…”

Section: Comparison With Some Other Bauxite Ore Depositsmentioning

confidence: 99%

Mineralogical and crystallographic characteristics of bauxites from some Grebnik’s (Metohija, Serbia) ore deposits

Cvetković¹,

Tančić²

2019

Geol An Balk Poluos

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Five typical bauxite samples from three ore deposits from the wider area of Grebnik Mt. (Metohija, Serbia) were examined with the optical microscopic, X-ray powder diffraction (XRPD) and chemical methods. The occurrences in bauxites were studied and described and the presence of major minerals was determined: diaspore, boehmite and hematite; minor minerals: quartz, goethite, rutile, kaolinite and hydro-hematite; as well as anatase, brookite, magnetite and chromite, which occur only sporadically. According to the quantity of main Al-bearers, three types of bauxite ore were recognized: diaspore, boehmite and boehmite-diaspore. Unit cell dimensions of major minerals were determined, mostly with values within reference data. However, all of the studied hematites have smaller a 0 and V 0 values, most probably due to the substitution of Fe 3+ by Al 3+. All samples are further classi ied as iron-rich and ferritic bauxites. It was found that there were changes in origin conditions between major Al-hydroxides minerals and hematite, as well as between the diaspore and boehmite. Determined chemical compositions put this raw material into high-quality raw materials for obtaining the electro corundum and alumina. The synthesis of the obtained data indicate that Grebnik's bauxites have some unique characteristics, more or less different from most of the World's known bauxite ore deposits.

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Mineralogical and geochemical investigations of the Mombi bauxite deposit, Zagros Mountains, Iran

Cited by 46 publications

References 64 publications

Mineralogical and Geochemical Features of Cretaceous Bauxite from San Giovanni Rotondo (Apulia, Southern Italy): A Provenance Tool

Mineralogical and Geochemical Features of Cretaceous Bauxite from San Giovanni Rotondo (Apulia, Southern Italy): A Provenance Tool

Formation of Ti-rich bauxite from alkali basalt in continental margin carbonates, Payas region, SE Turkey: implications for sea level change in the Upper Cretaceous

Mineralogical and crystallographic characteristics of bauxites from some Grebnik’s (Metohija, Serbia) ore deposits

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