Chemical weathering of the economic phosphates of Abu Tartur, Western Desert, Egypt

El-Kammar, Ahmed; Basta, E. Z.

doi:10.1016/0009-2541(83)90062-1

Cited by 20 publications

(3 citation statements)

References 2 publications

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“…The francolite lattice contains around 3.2 wt.% F and 3.1 wt.% CO 2 (El Kammar and Basta, 1983). The REE content of the Nile Valley phosphorites is most probably related to the composition of the terrigenous supply of the depositional sea, rather than to its depth (El-Kammar et al, 1979).…”

Section: Geological Setting Of Abu Tartur Phosphoritesmentioning

confidence: 98%

Geochemistry and microprobe investigations of Abu Tartur REE-bearing phosphorite, Western Desert, Egypt

Awadalla

2010

Journal of African Earth Sciences

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Section: Geological Setting Of Abu Tartur Phosphoritesmentioning

confidence: 98%

Geochemistry and microprobe investigations of Abu Tartur REE-bearing phosphorite, Western Desert, Egypt

Awadalla

2010

Journal of African Earth Sciences

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“…El-Kammar and Basta (1983) and (El-Kammar et al 1991) pointed out that the prevailing weathering in the arid Egyptian desert is sufficient to convert illite to smectite passing through illite-smectite-mixed layer. This conversion is accompanied with significant release of silica (Morris and Shepperd 1982;Carrels 1984).…”

Section: Clay Mineralsmentioning

confidence: 96%

Mineralogy, petrography, and biostratigraphy of the Lower Eocene succession at Gebel El-Qurn, West Luxor, Southern Egypt

et al. 2010

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The widely exposed siliciclastic/carbonate succession exposed at Gebel El-Qurn, west Luxor, has been investigated from the mineralogical, petrographical and biostratigraphical points of view. The succession belongs to the lower Eocene, including the upper Esna Shale and the Thebes Formations that have been deposited under varied marine conditions and during alternating periods of abundant and ceased clastic influx. They contain abundant and well-diversified planktonic foraminifera and calcareous nannoplankton, suggesting deposition in open marine inner to middle shelf environments. Mineralogical analysis carried out by XRD revealed the presence of smectite, illite, kaolinite, sepiolite, palygorskite, and smectite-illitemixed layer as the principal clay minerals, and calcite, dolomite, quartz, anhydrite, gypsum, hematite, and goethite as non-clay minerals. The clay mineral distributions in the sediments reflect the climatic conditions and the weathering processes at the source area as well as the differential hydraulic sorting during transportation. Calcite is the most abundant non-clay mineral, and this is consistent with high calcareous fossil content of the sediments. Petrographic examination of the carbonate lithologies within the succession enables to identify eight microfacies associations. These microfacies were affected by several diagenetic processes including; micritization, compaction, cementation, neomorphism, dissolution, dolomitization, and silicification. Dissolution of original test wall and replacement and infilling by iron oxides and recrystallized calcite were commonly observed. Calcareous nannofossils are generally common to frequent, highly diversified, and moderately to well preserved. Two calcareous nannofossil biozones; Tribrachiatus contortus Zone (NP10) and Discoaster binodosus (NP11) are recorded in the studied sediments suggesting lower Eocene age. Their associated nannofossil taxa are characterized by the predominance of warm water species. Sea-level fluctuations, basin physiography, climate, paleogeography, and sediment supply were the major controls on the deposition of the lower Eocene sediments at Gebel El-Qurn.

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“…Basta and El Kammar [28] concluded that Cu and Ni are most probably concentrated within carbonaceous matter. The fact that the skeletal apatite is highly enriched in carbonaceous matter compared to the bulk phosphorites explains the extensive depletion of weathered apatite in the heavy metal [29].…”

Section: Trace Elements Distributionmentioning

confidence: 99%

Geology and Geochemistry of the Phosphorite Deposits,sibaiya,area,nile,valley,egypt

El-Shazly

Mansour

Osman

et al. 2022

Arab Journal of Nuclear Sciences and Applications

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The present work aims to study the phosphorite deposits of the Late Cretaceous age that are belonging to the Duwi Formation. It is well exposed in Sibaiya area as oxidized phosphorite with yellowish to brown colour and non-oxidized phosphorite in some parts with grey to black color. This Formation could be classified into lower phosphorite, middle shale and upper phosphorite members. The lower phosphorite member is the most economic one. The average thickness of this member is 3.3 m in the western part, while it reaches 4.8 m in the eastern part of Sibaiya area. The phosphate beds are composed of peloids,Bioclasts of bone and teeth fragments and Coprolites. A geochemical analysis were done for, CaO, P2O5, SiO2, Fe2O3,MgOin% in addition to heavy metals Cd, Cr, Cu, Ni,Sr,Zn in ppm as well as U, Th and Ra in ppm. The results show that the average of P2O5 and U contents in oxidized phosphorite are 24.18 % and 69 ppm respectively. Meanwhile in non-oxidized phosphorite, they are 27.8 % and 85 ppm respectively. The variation in P2O5 and U contents in Sibaiya phosphorite rocks are probably related to depositional and digenetic aspects. Generally, the Sibaiya phosphorite could provide an economic value for production of phosphoric acid and extracted of U as by-product.

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Chemical weathering of the economic phosphates of Abu Tartur, Western Desert, Egypt

Cited by 20 publications

References 2 publications

Geochemistry and microprobe investigations of Abu Tartur REE-bearing phosphorite, Western Desert, Egypt

Geochemistry and microprobe investigations of Abu Tartur REE-bearing phosphorite, Western Desert, Egypt

Mineralogy, petrography, and biostratigraphy of the Lower Eocene succession at Gebel El-Qurn, West Luxor, Southern Egypt

Geology and Geochemistry of the Phosphorite Deposits,sibaiya,area,nile,valley,egypt

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