Rare earth element (REE) geochemistry and genetic implications of the Mortaş bauxite deposit (Seydişehir/Konya – Southern Turkey)

Karadağ, M. Muzaffer; Küpeli, Şuayip; Arýk, Fetullah; Ayhan, Ahmet; Zedef, Veysel; Döyen, Adnan

doi:10.1016/j.chemer.2008.04.005

Cited by 123 publications

(28 citation statements)

References 47 publications

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“…The chemical composition of the bauxites in the Abruzzi district has been compared with other bauxites from the major districts of the circum-Mediterranean area: Spinazzola (Apulia) [42], Salento and Gargano (Apulia) [11,57], Nurra (Sardinia) [44], Matese Mts. and Caserta districts (Campania) [8,10], Bolkardagi (Turkey) [58], Mortas (Turkey) [59] and the Parnassos-Ghiona district (Greece) [60].…”

Section: Comparison With Other Bauxite Deposits Of the Tethyan Realmmentioning

confidence: 99%

“…However, the SiO 2 enrichment of the Sardinia bauxites is considered to be due to the alteration process caused by the circulation of Si-rich solutions, which caused the re-silicification of boehmite as a consequence of the emplacement of Tertiary volcanites on top of the bauxites [61]. Lastly, the Salento (Apulia) bauxites [57] [62], BSL and UCC [63] [59]) and Parnassos-Ghiona (Greece, [60]) deposits has not been reported due to the absence of data in the original papers.…”

Section: Comparison With Other Bauxite Deposits Of the Tethyan Realmmentioning

confidence: 99%

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Geochemical Characterization of Bauxite Deposits from the Abruzzi Mining District (Italy)

Putzolu¹,

Papa²,

Mondillo³

et al. 2018

Minerals

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Abstract:The Abruzzi bauxite district includes the deposits located on the Campo Felice plateau and those of the Monti d'Ocre, which had been mined in the first part of the 20th century. Bauxite is of the karst type, with textures ranging between oolitic and oolitic-conglomeratic, the latter suggesting a partial reworking of evolved lateritic soils. The high contents of Al 2 O 3 and Fe 2 O 3 (average values 53.76 and 21.76 wt %, respectively) are associated with the presence of boehmite, hematite, and minor goethite. SiO 2 and TiO 2 have average values of 7.79 and 2.75 wt %, corresponding to the presence of kaolinite, anatase and rutile. Among the minor so-called "bauxitophile" elements V, Co, Ni, Cr and Zr, the most enriched is Cr, with an average value of 0.07 wt %. Nickel has an average value of 210.83 ppm. Vanadium shows an average value of 266.57 ppm, whereas the average Co concentration is 35.89 ppm. The total rare earth elements (REE) concentration in the sampled bauxite sites is variable between ca. 700 and 550 ppm. Among REEs, the most abundant element is Ce, with Ce anomalies commonly associated with authigenic REE-fluoro-carbonates, probably produced after the REEs remobilization from primary detrital minerals and their precipitation in neo-formed phases during the bauxitization process. Scandium and Ga occur in small amounts (57 and 60 ppm, respectively), but geochemical proxies of their remobilization and uptake in neo-formed minerals (Feand Al-(hydr)oxides, respectively) have been observed. The mean Eu/Eu* and Al 2 O 3 /TiO 2 ratios and the Ni-Cr contents of the Abruzzi bauxites suggest that the parent rock of these deposits was a material of acid affinity, likely corresponding to volcanic tephra or eolic loess-type sands.

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Section: Comparison With Other Bauxite Deposits Of the Tethyan Realmmentioning

confidence: 99%

Section: Comparison With Other Bauxite Deposits Of the Tethyan Realmmentioning

confidence: 99%

Geochemical Characterization of Bauxite Deposits from the Abruzzi Mining District (Italy)

Putzolu¹,

Papa²,

Mondillo³

et al. 2018

Minerals

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“…The similarity of REE pattern of bauxite horizons and the Khaneh-Kat argillic dolomite support that the Khaneh-Kat could be parent rock of the Dopolan bauxite [69]. Furthermore, the REEs show affinity to mobilization during bauxitization and subsequent redistribution [15]. The REE patterns demonstrate that bauxite samples are enriched in REEs, possibly due to prolonged tropical weathering which led to the breakdown of rock-forming minerals [70,71].…”

Section: Discussionmentioning

confidence: 82%

“…Calculated La/Y variations in bauxites can be related to LREE variations in the bauxite profile suggesting that the leaching of LREE in the pisolitic bauxite may be the result of low pH conditions. Ce/Ce * ratio in the 0.86-1.73 range (Table 3) suggests that Ce +3 was leached out from the oolitic and pisolitc bauxite and was available to be transported to deeper layers and precipitated near the bed rock [15]. …”

Section: Rare Earth Elementsmentioning

confidence: 99%

“…Karst bauxite deposits from the Mediterranean region and other worldwide bauxite formations have been investigated by a number of authors [2][3][4][5][6][7][8][9][10][11]. Karst bauxite genesis is related to paleo-weathering products derived from different rocks types including carbonate rocks, marl, volcanic and magmatic rocks [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Mineralogy, Geochemistry and Stable Isotope Studies of the Dopolan Bauxite Deposit, Zagros Mountain, Iran

et al. 2016

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Abstract:The Dopolan deposit is a Mediterranean-type bauxite located in the Zagros Fold-Thrust Zone, Iran. This deposit consists of five lithological members including iron-rich, clay-rich, oolitic, pisolitic and organic matter-containing bauxites. The mineralogy of the deposit includes diaspore, boehmite, and kaolinite, nacrite, with minor pyrite, anatase and rutile. Geochemical studies show that light rare earth elements (LREEs) are enriched relative to heavy rare earth elements (HREEs) in all members, supporting an authigenic origin. Mass changes based on Ti as an immobile element indicate that conventionally-immobile elements (Al, Nb, Ta, Zr, Hf) are enriched in situ in the residual units, whereas mobile elements (K, Ca, Si) were depleted during bauxitization. This study shows that the Khaneh-Kat argillitic dolomite is the likely parent rock. The δ 18 O (7.63‰to 9.35‰) and δD values (´49.91‰to´66.49‰) for kaolinite in the bauxite samples suggest equilibration with meteoric waters which supports a supergene origin. Bauxitization occurred in a warm climate with relatively constant isotopic composition suggesting climate stability during the development of bauxite horizons and remobilization of Al (with formation of secondary boehmite). The δ 13 C values of calcite (´7.3‰) in the bauxite support the idea that the Khaneh-Kat Formation has experienced post-depositional isotope exchange with meteoric waters during the karstification process.

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Petrographical, mineralogical, and geochemical characteristics of the Palaeocene lateritic bauxite deposits of Kachchh Basin, Western India

Singh¹,

Srivastava

2018

Geological Journal

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Petrographical, mineralogical, and geochemical characteristics of a blanket‐type lateritic bauxite deposit, bordering the Deccan basalt in Kachchh, are investigated to interpret the parent rock, lateritization processes, and palaeogeographical position of the basin. The presence of partly weathered vesicular basalt at the base of the succession along with partly preserved plagioclase, augite, and hornblende in petrographical observations suggests the in situ nature of these bauxites. X‐ray diffraction analysis reveals gibbsite as the major bauxitic mineral associated with kaolinite, goethite, titanium‐rich anatase, calcite, haematite, and quartz as subconstituents. The presence of gibbsite, kaolinite, and goethite in the majority suggests that warm and humid climatic conditions prevailed during the lateritic bauxite formation. SEM‐EDS analysis shows that most of the gibbsites are mesocrystalline with particle sizes 50–200 μm that coexists with microcrystalline goethite, kaolinite, rutile, and haematite. These deposits are classified as bauxite, ferruginous bauxite, and laterite, based on chemical composition. The high CIA values (86.6–98.1%) suggest their formation under high run‐off and water‐logged conditions similar to that which prevails in the equatorial region. The Zr–Cr–Ga ternary plot testifies to the mafic composition of the parent rock. The major oxides and chondrite‐normalized trace and REEs behaviours, (La/Sm)N ratio (~5.77), and Eu anomaly of these lateritic bauxites suggest that they (bauxites) were formed in situ by the intensive leaching and alteration of the basaltic parent rock, and the process of bauxitization followed the path of deferruginization and destruction of kaolinite. The development of a lateritic regolith over the Deccan basalt was possible during Palaeocene time when the Indian Plate was in complete isolation and the Kachchh region was positioned near the equator in the Southern Hemisphere.

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Rare earth element (REE) geochemistry and genetic implications of the Mortaş bauxite deposit (Seydişehir/Konya – Southern Turkey)

Cited by 123 publications

References 47 publications

Geochemical Characterization of Bauxite Deposits from the Abruzzi Mining District (Italy)

Geochemical Characterization of Bauxite Deposits from the Abruzzi Mining District (Italy)

Mineralogy, Geochemistry and Stable Isotope Studies of the Dopolan Bauxite Deposit, Zagros Mountain, Iran

Petrographical, mineralogical, and geochemical characteristics of the Palaeocene lateritic bauxite deposits of Kachchh Basin, Western India

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