Composition and origin of Ti–Nb–Ta–Zr bearing minerals in the Abu Diab highly evolved granite from the Central Eastern Desert of Egypt

Sami, Mabrouk; Mahdy, Nasser M.; Ntaflos, Theodoros; Fathy, Douaa

doi:10.1016/j.jafrearsci.2020.103808

Cited by 26 publications

(14 citation statements)

References 54 publications

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“…The Um Solimate late magmatic stage pegmatites were derived from gmgr. The geochemical features of the gmgr are a relatively soda-rich magma, calc-alkaline in nature, belonging to A-type, and emplaced during a within-plate tectonic setting (Soliman et al, 2009;Sami et al, 2020).…”

Section: The Main Features Of Nyf-pegmatitesmentioning

confidence: 99%

Geology and Mineral Chemistry of Uranium‐ and Thorium‐bearing Minerals in Rare‐Metal (NYF) Pegmatites of Um Solimate, South Eastern Desert, Egypt

Ali

Gawad

Ghoneim

2021

Acta Geologica Sinica (Eng)

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and REEs, and semi-precious colored gemstones such as topaz, beryl and tourmaline (Černý et al., 2012). Furthermore, they also represent the main sources of feldspar, which is used in the ceramics, glass and electronics industries. Pegmatites occur as sharply bounded homogeneous to zoned bodies within igneous or metamorphic host rocks. The current classification scheme uses some of these indicators to group granite pegmatites into five classes: abyssal, muscovite, muscovite-rare element, rare-element, and miarolitic (Černý, 1991; Černý and Ercit, 2005). This scheme is widely accepted, although some researchers have noted a greater diversity in pegmatites and pegmatite gneisses as well as a lack of correlation between depth and geochemistry (Simmons and Webber, 2008). For example, pegmatites in the rareelement class can be grouped into two families based on the principal rare-elements present. Firstly, Lithium-Cesium-Tantalum (LCT) pegmatite, which is identified as a diagnostic association, associated with S-type granites, that can be derived from mature sedimentary sources, for example marine shales. Pegmatites of this type can contain higher concentrations of Li, Rb, Cs, Be, Nb Ta, and Sn, as well as fluxing components such as P, F and B, as reported by Stilling et al. (2006), Simmons et al. (2016 and Liu et al. (2019). Other studies showed that the second Niobium-Yttrium-Fluorine (NYF) association can be used as a trace element signature (Černý and Ercit, 2005;Černý et al., 2012). Normally, NYF family pegmatites show a strong affiliation with A-type (anorogenic environment, lower continental crust ± mantle source) granitic magmas. In an orogen, NYF pegmatites can be spatially close to some Itype (igneous source) granites but they do not show any genetic link. The possibility that I-type magmas can produce NYF pegmatites is very low (Černý et al., 2012). NYF-pegmatites are enriched in Y, REE, Ti, Zr, Nb, Ta, U, Th, and F (Černý, 1991). In addition, a mixed LCT + NYF type, represented in pegmatites with intermediate geochemical signatures, has also been recognized (Černý

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Section: The Main Features Of Nyf-pegmatitesmentioning

confidence: 99%

Geology and Mineral Chemistry of Uranium‐ and Thorium‐bearing Minerals in Rare‐Metal (NYF) Pegmatites of Um Solimate, South Eastern Desert, Egypt

Ali

Gawad

Ghoneim

2021

Acta Geologica Sinica (Eng)

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“…Among different granitic rocks, the post-orogenic and anorogenic granites have conspicuous rare metals enrichment that are commonly modified by later hydrothermal processes such as albitization, silicification, and fluoritization [9][10][11][12][13]. This rare metal mineralization includes Zr, Ta, Nb, and W as well as others, such as high contents of rare earth element (REE), U, and Th mineralization, attracting the attention of many geologists and authors to shed light on theses rocks, due to their importance in industrial applications [14].…”

Section: Introductionmentioning

confidence: 99%

Radiological Hazards and Natural Radionuclide Distribution in Granitic Rocks of Homrit Waggat Area, Central Eastern Desert, Egypt

et al. 2022

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Natural radioactivity, radiological hazard, and petrological studies of Homrit Waggat granitic rocks, Central Eastern Desert, Egypt were performed in order to assess their suitability as ornamental stone. On the basis of mineralogical and geochemical compositions, Homrit Waggat granitic rocks can be subdivided into two subclasses. The first class comprises granodiorite and tonalite (I-type) and is ascribed to volcanic arc, whereas the second one includes alkali-feldspar granite, syenogranite, and albitized granite with high-K calc alkaline character, which is related to post-orogenic granites. 238U, 226Ra, 232Th, and 40K activities of natural radionuclides occurring in the examined rocks were measured radiometrically using sodium iodide detector. Furthermore, assessment of the hazard indices—such as: annual effective dose (AED) with mean values (0.11, 0.09, 0.07, 0.05, and 0.03, standard value = 0.07); gamma radiation index (Iγ) with mean values (0.6, 0.5, 0.4, 0.3, and 0.14, standard value = 0.5); internal (Hin) with mean values (0.6, 0.5, 0.4, 0.3, and 0.2, standard value = 1.0); external (Hex) index (0.5, 0.4, 0.3, 0.24, and 0.12, standard value = 1.0); absorbed gamma dose rate (D) with mean values (86.4, 75.9, 53.5, 43.6, and 20.8, standard value = 57); and radium equivalent activity (Raeq) with mean values (180, 154, 106.6, 90.1, and 42.7, standard value = 370)—were evaluated with the knowledge of the natural radionuclides. The result of these indices falls within the acceptable worldwide limits. Therefore, we suggest that these rocks are safe to be used in industrial applications.

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“…Whole-rock major and trace elements were analyzed with the sequential X-ray fluorescence spectrometer Phillips PW 2400 at the Department of Lithospheric Research, University of Vienna, Austria. Fused pellets for major elements and powder pellets for trace elements were used, and the procedure details were described by Sami et al 34 The XRF analytical precision was estimated to be better than 5%.…”

Section: Methodsmentioning

confidence: 99%

Provenance Characterization of Campanian Lacustrine Organic-Rich Mudstones on the Southern Tethyan Margin, Egypt

Fathy

Wagreich

Ntaflos

et al. 2021

ACS Earth Space Chem.

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Campanian lacustrine organic-rich mudstones were deposited under a warm greenhouse climate in Egypt. In this study, integrated elemental geochemical analyses have been applied to discriminate the paleoweathering conditions, provenance, and tectonic setting of these mudstones. The studied samples are relatively enriched in Al, Ca, V, Sc, and Cr compared to Post-Archean Australian shales (PAAS). Their chondrite normalized REE patterns show enrichment in the light REE compared to heavy REE, with a negative Eu anomaly (Eu/Eu* = ∼0.77). The low values of Th/Sc (0.42), Zr/Sc (5.05), and Zr/Hf (36.3) for the studied samples indicate no input from recycled older sedimentary strata. The ratios of the compositional variability index (ICV = 0.76), K/Al (0.072), Al/Si (0.34), and K/Si (0.025) suppose that the mudstones are compositionally mature source rocks and originated in quiescent and low energy depositional environments. The average values of the chemical index of alteration (CIA = 82), chemical proxy of alteration (CPA = 94), and plagioclase index of alteration (PIA = 87) and ln(Al2O3/Na2O = 3.6) for the studied mudstones imply moderate to intensive chemical weathering. Moreover, the provenance sensitive elemental proxies (e.g., La/Sc, Th/Sc, Th/Cr, Cr/Th) and multiple discrimination diagrams reveal that the mudstones could be derived from intermediate igneous parent rocks. The lacustrine organic-rich sediments were sourced from a Phanerozoic to Proterozoic arc setting based on various tectonic discrimination diagrams.

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Composition and origin of Ti–Nb–Ta–Zr bearing minerals in the Abu Diab highly evolved granite from the Central Eastern Desert of Egypt

Cited by 26 publications

References 54 publications

Geology and Mineral Chemistry of Uranium‐ and Thorium‐bearing Minerals in Rare‐Metal (NYF) Pegmatites of Um Solimate, South Eastern Desert, Egypt

Geology and Mineral Chemistry of Uranium‐ and Thorium‐bearing Minerals in Rare‐Metal (NYF) Pegmatites of Um Solimate, South Eastern Desert, Egypt

Radiological Hazards and Natural Radionuclide Distribution in Granitic Rocks of Homrit Waggat Area, Central Eastern Desert, Egypt

Provenance Characterization of Campanian Lacustrine Organic-Rich Mudstones on the Southern Tethyan Margin, Egypt

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