Geochemistry, mineralogy, and radioactivity of Upper Cretaceous Abu Khruq Ring Complex, South Eastern Desert, Egypt

Afandy, A. H. El; Nahas, H. A. El; Dawood, Nazar A.; Asran, H. M.

doi:10.1007/s12517-012-0560-3

Cited by 3 publications

(4 citation statements)

References 18 publications

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“…These two types consist of alkaline trachyte and rhyolitic porphyry as extrusive type at the center of the ring followed by alkaline gabbroic and syenitic rocks comprises oversaturated to under-saturated syenites. The form of these rocks is diverse in shape as dissected ring, cone, sheets and stock like bodies (El Ramly, et al, 1969 andEl Afandy, et al, 2012). The lithologies created at the same time and place as another consequently they are represented as indistinguishable ages in this area (El Afandy and Abdalla, 2001).…”

Section: Geological Settingmentioning

confidence: 99%

“…The form of these rocks is diverse in shape as dissected ring, cone, sheets and stock like bodies (El Ramly, et al, 1969 andEl Afandy, et al, 2012). The lithologies created at the same time and place as another consequently they are represented as indistinguishable ages in this area (El Afandy and Abdalla, 2001).…”

Section: Geological Settingmentioning

confidence: 99%

“…This ring complex consists of a wide variety of rocks including syenitic rocks and their volcanic equivalent. Their rocks range between undersaturated to over-saturated with clear alkaline affinities Hussein 1982 andEl Afandy et al 2012 andMogahed, 2016). These rocks are considered as natural raw materials to be exploited in glass ceramic production.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Abu Khruq Nepheline Syenite and Its Compensation With Soda-Lime-Glass for Preparation of Glassceramic

2018

Egyptian Journal of Geology

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The Abu Khruq ring complex (ARC) is located in the Southern Eastern Desert of Egypt. It is composed mainly of nepheline syenite, syenite and quartz syenite. Petrographical and chemical analysis (XRF) were achieved to identify the mineral composition and to define the nature of the various rock types present in the area.Geochemically, the different types of alkaline syenitic rocks from margin and the center of the ring show decrease of Na 2 O and enrichment of SiO 2 toward the margin. The syenitic rocks have a considerable value of Al 2 O 3 (12.8 -17.3 wt. %) and total alkalis are above 8.5 wt.% which might indicate magma developed from deep crustal source of mixed material from the mantle. According to plate tectonic theory, the different types of syenitic rocks placed in within plate anorogenic belts.Sintered glass-ceramic was prepared from local nepheline syenite with soda-lime-silicate glass. B 2 O 3 added to the glass batches to decrease the melting temperature as well as the glass melt viscosity. MgF 2 and CaF 2 were added to the glass batches as nucleation catalysts. Little nepheline, augite, xonotlite and fluorite were developed in the samples after sintering process. Very little or traces of nepheline was formed in boron-free and -containing sample. Although MgF 2 enhance augitic pyroxene, CaF 2 appropriate the formation of xonotlite. In all samples nano-and micro-size rods were developed in the glassy matrix. The Vickers microhardness and densities values were between ~ 396.5 to 676.2 kg/mm 2 and ~ 2.14 to 2.52 g/cm 3 , respectively. The produced glass-ceramic can be used in building materials.

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of Abu Khruq Nepheline Syenite and Its Compensation With Soda-Lime-Glass for Preparation of Glassceramic

2018

Egyptian Journal of Geology

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“…These ring complexes show diversities in chemical composition, lithology, and formation age (Tables 1 and S1). A wide variety of rock types, ranging from basic to acidic and from nepheline-bearing (undersaturated) to quartz-bearing rocks (oversaturated), occur in these complexes (e.g., Akaad and El Ramly, 1962;El Ramly et al, 1969, 1971Hussein, 1982, 1985). Their formation ages range from Late Proterozoic (~610 Ma) to late Cretaceous (~90 Ma) with noticeable peaks of…”

Section: Introductionmentioning

confidence: 99%

Magma fractionation and emplacement mechanism in a subvolcanic plumbing system in a continental region: constraints from the late Neoproterozoic Wadi Dib ring complex in the Eastern Desert, Egypt

SAAD,

OZAWA,

KURITANI

et al. 2023

Journal of Mineralogical and Petrological Sciences

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We examined an alkaline ring complex in the Eastern Desert of Egypt, Wadi Dib ring complex (WDRC), to understand formation mechanisms of the intimately related ring structure and chemical diversity. The WDRC consists of multiple circular rings of the oldest volcanic units, the middle-stage plutonic unit, and the youngest dike unit, and these units show overlapping whole-rock major element compositions. The compositional variation of the volcanic and plutonic units can be accounted for by a stepwise fractional crystallization starting with trachyte, without significant magma replenishment or crustal contamination. From the margin to the center and oldest to youngest, the plutonic unit consists of an outer ring (syenite), inner rings 1 (quartzbearing syenite) and 2 (quartz syenite), and a granitic core (syenogranite). The wholerock chemical composition of the plutonic unit is progressively more fractionated inwards from the outer ring to the granitic core through the inner rings. Syenites from the innermost outer ring show high degree of deformation, which gradually decreases outwards in the outer ring and abruptly decreases inwards in the outermost inner ring 1.The deformed syenites show microstructures suggesting reactive melt transportation.The country rocks neighboring the ring complex and equivalent blocks present in the periphery of the outer ring, the overlying volcanic unit and equivalent blocks present in the inner rings all show microstructures indicative of pyrometamorphism. Spatial variations in the microstructures in the plutonic unit indicate an increase in cooling rate from the outer ring to the granitic core and thus with time. These geological, chemical, and microstructural features of the WDRC suggest that the ring complex represents an evolving roof zone of a subvolcanic magma body located at a depth of a few km.Intimate coupling of growing roof and sidewall mushy boundary layers and later collapse of the roof boundary layer with occasional involvement of the overlying volcanic piles induced segregation of interstitial fractionated melt from the wall boundary layer to the collapse space driven by a pressure gradient induced by the collapse. The ascended fractionated melt started to crystallize to form a roof boundary layer of the next generation by increasing cooling efficiency, which thickened until the next collapse on a smaller horizontal scale inducing melt segregation from the wall boundary layer towards the roof zone. Repetition of the sequence with shallowing and decreasing the horizontal scale produced the ring structure and chemical diversity of the WDRC.

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Petrogenesis of cogenetic silica-oversaturated and -undersaturated syenites of Abu Khruq ring complex, South Eastern Desert, Egypt

Mogahed

2016

Journal of African Earth Sciences

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Geochemistry, mineralogy, and radioactivity of Upper Cretaceous Abu Khruq Ring Complex, South Eastern Desert, Egypt

Cited by 3 publications

References 18 publications

Characterization of Abu Khruq Nepheline Syenite and Its Compensation With Soda-Lime-Glass for Preparation of Glassceramic

Characterization of Abu Khruq Nepheline Syenite and Its Compensation With Soda-Lime-Glass for Preparation of Glassceramic

Magma fractionation and emplacement mechanism in a subvolcanic plumbing system in a continental region: constraints from the late Neoproterozoic Wadi Dib ring complex in the Eastern Desert, Egypt

Petrogenesis of cogenetic silica-oversaturated and -undersaturated syenites of Abu Khruq ring complex, South Eastern Desert, Egypt

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