Preliminary Data of REE in Algerian Phosphorites: A Comparative Study and Paleo-redox Insights

Kechiched, Rabah; Laouar, Rabah; Bruguier, Olivier; Laouar-Salmi, Sihem; Ameur-Zaimeche, Ouafi; Foufou, Atif

doi:10.1016/j.proeng.2016.02.048

Cited by 31 publications

(9 citation statements)

References 19 publications

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“…However, REE-phosphate should be considered the main mineral form of phosphorus in both Bakchar and Lisakovsk deposits. The search for apatite has been given special attention because of their potential as REE concentrators, such as the example of sedimentary deposits in North Africa [82][83][84].…”

Section: Discussionmentioning

confidence: 99%

Minerals of Rare Earth Elements in High-Phosphorus Ooidal Ironstones of the Western Siberia and Turgai Depression

et al. 2019

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The aim of this research was to study the rare earth (REE) minerals in ooidal ironstone deposits of the West Siberian basin and the Turgai depression. Authigenic minerals (monazite and cerite) were described, and their main mineral form was identified as light rare earth element phosphate (LREE-phosphate) in this study. LREE-phosphate is included in ferruginous ooids, peloids, and oncoids and forms a consistent mineral association with Fe-hydroxides (goethite and its hydrated amorphous derivatives) and Fe-rich layered silicates (Fe-illite-smectite, chamosite, berthierine). The constancy of the mineral association in two deposits of different ages indicates a general mechanism behind the formation of these minerals. LREE-phosphates (authigenic monazite) are characterized by microscopic sizes (up to 24 μm), diverse morphology (mainly spherical or xenomorphic), and occupy spaces between the micro-cortex in ferruginous spheroids. This mineral can be found in other deposits of ooidal ironstone. According to its mineralogical and chemical characteristics, LREE-phosphate mainly belongs to the authigenic (nodular or “gray”) monazite. However, the incomplete (not 100%) correspondence of Kikuchi bands with the reference monazite does not allow its reliable identification. Based on its small size, chemical leaching or bacterial interaction is recommended to extract REE from ooidal ironstone while predicting the associated removal of phosphorus from iron ore due to its dominant phosphate mineral form. Ooidal ironstone should be considered a complex deposit and an unconventional natural type of REE ores as an example of the largest Bakchar and Lisakovsk deposits.

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Section: Discussionmentioning

confidence: 99%

Minerals of Rare Earth Elements in High-Phosphorus Ooidal Ironstones of the Western Siberia and Turgai Depression

et al. 2019

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“…The study site extends approximately to 250ha and belongs to the Djebel Onk mining basin which represents the occidental part of Gafsa-Metaloui-Onk basin containing many phosphorite layers deposited from late Cretaceous to early Eocene [32][33][34]. Although this lateral continuity, the Kef-Essenoun deposit displays substantial differences to the Gafsa Metlaoui basin, especially with regard to the lithology and the succession particularly in the phosphorite formation [35][36]. In the Kef-Essenoun deposit, the sedimentary lithologies consist of ~ 500m thick succession of upper Cretaceous (Maastrichtian) to middle Eocene (Lutetian) age where upper thanetian phosphorite layer is mined for phosphate raw material [32][33][34][35][36][37].…”

Section: General Settingmentioning

confidence: 99%

“…Although this lateral continuity, the Kef-Essenoun deposit displays substantial differences to the Gafsa Metlaoui basin, especially with regard to the lithology and the succession particularly in the phosphorite formation [35][36]. In the Kef-Essenoun deposit, the sedimentary lithologies consist of ~ 500m thick succession of upper Cretaceous (Maastrichtian) to middle Eocene (Lutetian) age where upper thanetian phosphorite layer is mined for phosphate raw material [32][33][34][35][36][37].…”

Section: General Settingmentioning

confidence: 99%

Geotechnical Characterization of Phosphate Mining Waste Materials for Use in Pavement Construction

Malaoui

Harkati

Soltani

et al. 2023

Eng. Technol. Appl. Sci. Res.

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Waste rock materials are becoming widely used in road pavement and building constructions in many countries. In this work, experimental laboratory tests were carried out on the waste rock produced from the extraction of the phosphate in the Kef-Essenoun mine, to study the performance of road pavement foundations built with these types of material. Two types of waste, namely phosphatic limestone (type 1) and limestone (type 2), were initially tested to determine the most suitable one to be used in pavement structures. The characterization tests showed that the presence of carbonate-fluorapatite and carbonate-fluorapatite, and calcite, dolomite, and quartz are predominant in phosphatic limestone and limestone, respectively. The Los Angeles Abrasion (LA) and Micro-Deval (MD) values range from 59.9% to 90.4% and 42.05% to 86.31% for phosphatic limestone and from 43.64% to 95.88% and 38.25% to 75% for limestone. The CBR values of type 1 and type 2 waste were found to be 10.5% and 18.7% respectively. The results show that these materials, classified as B42ts and B42s respectively, could be used cautiously in capping layers and pavement backfilling materials. Furthermore, they must be treated with a hydraulic binder such as cement in order to improve their physical and mechanical properties.

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“…The Paleocene-Eocene sediments are characterized by marls, shelly and chalky limestones rich in shark teeth and nummulites, showing phosphorite layers and silex nodules (Kechiched et al, 2016). These phosphorites are rich in glauconite, which may indicate reworking processes of phosphatic particles before their deposition and final burial in a sub-oxic to sub-reduced environment (Kechiched et al, 2018).…”

Section: Location and Geological Backgroundmentioning

confidence: 99%

Shallow marine trace-fossils from the Middle Miocene of the Tebessa Basin (NE Algeria) and their paleoenvironmental implications

Benkhedda

Defaflia

Cherif

et al. 2022

Rev. bras. paleontol.

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The northeastern part of Algeria is characterized by Meso–Cenozoic fossiliferous deposits. All the previous studies have been focused on invertebrate and vertebrate body fossils from this region. In the present paper we provide the first ichnological study from the region of Ouenza, Tebessa Wilaya (northeastern Algeria). An ichnoassemblage composed of eight ichnotaxa, namely cf. Archaeonassa isp., Arenicolites isp., Diplocraterion isp., Helminthopsis isp., Palaeophycus tubularis, Skolithoscf. linearis, cf. Taenidium isp., and Thalassinoides isp., reported from the lower Langhian (Middle Miocene) of Aïn Sidi Salah locality (Tebessa Basin) is discussed. These trace-fossils belong to the Skolithos and proximal Cruziana ichnofacies indicating deposition within a shallow marine (littoral). The large size of Thalassinoides suggests well-oxygenated setting, under moderate- to high-energy conditions, with occasional storm events. Keywords: trace-fossils, paleoenvironments, shallow marine, Middle Miocene, Tebessa.

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Preliminary Data of REE in Algerian Phosphorites: A Comparative Study and Paleo-redox Insights

Cited by 31 publications

References 19 publications

Minerals of Rare Earth Elements in High-Phosphorus Ooidal Ironstones of the Western Siberia and Turgai Depression

Minerals of Rare Earth Elements in High-Phosphorus Ooidal Ironstones of the Western Siberia and Turgai Depression

Geotechnical Characterization of Phosphate Mining Waste Materials for Use in Pavement Construction

Shallow marine trace-fossils from the Middle Miocene of the Tebessa Basin (NE Algeria) and their paleoenvironmental implications

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