Heba S. Mubarak

National Research Centre

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Mokhles K. Azer

National Research Centre

Paul D. Asimow

California Institute of Technology

Martin J. Whitehouse

Swedish Museum of Natural History

Kamal A. Ali

King Abdulaziz University

Rolf L. Romer

Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences

Robert J. Stern

The University of Texas at Dallas

Minghua Ren

University of Nevada, Las Vegas

Matthew I. Leybourne

Queen's University

Hilmy E. Moussa

National Research Centre

Mona Kabesh

Cairo University

Cooperative Institutions

National Research Centre

King Saud University

California Institute of Technology

The University of Texas at Dallas

Cairo University

National Water Research Center

Assiut University

King Abdulaziz University

The University of Texas at El Paso

Swedish Museum of Natural History

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Supplementary Table 1k: Micas. The Atud Gabbro–Diorite Complex: Glimpse of the Cryogenian Mixing, Assimilation, Storage, and Homogenization Zone beneath the Eastern Desert of Egypt

Figshare (2020)

Robert J. Stern Kamal A. Ali Paul D. Asimow Mokhles K. Azer Matthew I. Leybourne

Supplementary Table 1k: Micas.

Diorite

Assimilation (phonology)

Homogenization

10.6084/m9.figshare.12220277

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Citations (0)

Supplementary Table 1b: Orthopyroxenes. The Atud Gabbro–Diorite Complex: Glimpse of the Cryogenian Mixing, Assimilation, Storage, and Homogenization Zone beneath the Eastern Desert of Egypt

Figshare (2020)

Robert J. Stern Kamal A. Ali Paul D. Asimow Mokhles K. Azer Matthew I. Leybourne

Supplementary Table 1b: Orthopyroxenes.

Diorite

10.6084/m9.figshare.12220283

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Supplementary Table 1g: Epidotes. The Atud Gabbro–Diorite Complex: Glimpse of the Cryogenian Mixing, Assimilation, Storage, and Homogenization Zone beneath the Eastern Desert of Egypt

Figshare (2020)

Robert J. Stern Kamal A. Ali Paul D. Asimow Mokhles K. Azer Matthew I. Leybourne

Supplementary Table 1g: Epidotes.

Diorite

10.6084/m9.figshare.12220289

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Origin and magmatic evolution of late Neoproterozoic post-accretion high-K calc-alkaline adakitic volcanics in the northern Arabian–Nubian Shield

American Journal of Science (2021)

Bassam A. Abuamarah Mokhles K. Azer Heba S. Mubarak

In the northernmost segment of the Arabian–Nubian Shield, a post-collisional high-K calc-alkaline volcanic sequence is exposed along Wadi Abu Ma’amel, Eastern Desert of the Nubian Shield. It comprises a series of intermediate to silicic volcanics and associated pyroclastics that include the Imperial Porphyry and calc-alkaline volcanics typical of the Dokhan Volcanics. The Imperial Porphyry occurs as subvolcanic sill-like intrusions forming the young member of the Dokhan Volcanics. The volcanic sequence extruded through synorogenic granite and was intruded by post-collisional granite, which also caused thermal contact metamorphism. The red and purple colors of the Imperial Porphyry reflect hydrothermal alterations, which resulted in the formation of dispersed flakes of hematite, epidote, and piemontite. The entire high-K calc-alkaline volcanic sequence, ranging from andesite through dacite and rhyodacite, exhibits post-collisional geochemical characteristics. Most samples of the Imperial Porphyry and some of the typical Dokhan Volcanics have characteristics of adakitic rocks, including high Sr (694–889 ppm), low Y (10.6–18.8 ppm), high Sr/Y (41.1–83.8), (La/Yb)_n (8.6–15.6), and low (Yb)_n (5.4–9.0). The mostly calc-alkaline character and other traits of the studied volcanics that were previously interpreted to indicate arc magmatism reflect, instead, remelting of earlier (pre-collisional) arc-related material. The formation of Wadi Abu Ma9amel volcanics resulted from upwelling of hot asthenospheric material during thinning of the previously thickened lithosphere as a consequence of lithospheric delamination. The parental magma was generated by partial melting of mafic lower crust that mixed with upper-crust-derived magma. It evolved mostly through fractionation of clinopyroxene and plagioclase, accompanied by apatite and Fe–Ti oxides in the more-evolved dacitic and rhyodacitic rocks.

10.2475/05.2021.02

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Citations (2)

Petrological characteristics of the Neoproterozoic Ess ophiolite mantle section, Arabian Shield, Saudi Arabia: a mineral chemistry perspective

International Journal of Earth Sciences (2019)

Hisham A. Gahlan Mokhles K. Azer Paul D. Asimow Heba S. Mubarak Khalid M. Al-Kahtany

Ultramafic rock

Peridotite

Metasomatism

Forearc

Forsterite

Protolith

Chromitite

Amphibole

10.1007/s00531-019-01799-3

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Citations (16)

Geochemistry and Petrogenesis of Late Ediacaran Rare‐metal Albite Granites of the Arabian‐Nubian Shield

Acta Geologica Sinica - English Edition (2019)

Bassam A. ABUAMARAH Mokhles K. Azer Paul D. Asimow Habes Ghrefat Heba S. Mubarak

Abstract The Abu Dabbab albite granite (ADAG), in the central Eastern Desert of Egypt, hosts the most significant rare metal ore deposit in the northern part of the Neoproterozoic Arabian‐Nubian Shield. Here, we report detailed field, petrographic, mineralogical and geochemical investigation of the ADAG, an isolated stock‐like granitic body with sharp intrusive contacts against metamorphic country rocks, probably emplaced at about 600 Ma. The fine‐grained porphyritic upper unit is a preserved remnant of the shallowly‐emplaced apex of the magma chamber, whereas the medium‐grained lower unit crystallized at deeper levels under subvolcanic conditions. The peraluminous leucocratic ADAG shares common geochemical characteristics with post‐collisional intraplate A‐type magmas. In addition to the conspicuous enrichment in Na 2 O, the ADAG is remarkable for its anomalous concentrations of Ta, Nb, Li, Hf, Ga, Sn, Zn and heavy rare‐earth elements. Nb‐Ta minerals in the ADAG are mixed with Fe‐Mn oxides, forming black patches that increase in abundance toward of the base of the intrusion. Columbite‐tantalite, cassiterite and wolframite are the most important ore minerals. Pronounced negative Eu anomalies (Eu/Eu ∗ = 0.10–0.24) reflect extreme magmatic fractionation and perhaps the effects of late fluid‐rock interaction. The ADAG was most likely generated by partial melting of the juvenile middle crust of the ANS as the geotherm was elevated by erosional uplift following lithospheric delamination and it was emplaced at the intersection of lineations of structural weakness. Although formation of the ADAG and its primary enrichment in rare metals are essentially due to magmatic processes, late‐stage metasomatism caused limited redistribution of rare metals. Fluid‐driven subsolidus modification was limited to the apex of the magma chamber and drove development of greisen, amazonite, and quartz veins along fracture systems.

Petrogenesis

Metallogeny

Pegmatite

Fractional crystallization (geology)

10.1111/1755-6724.14379

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Citations (16)

Supplementary Table 1i: Titanites. The Atud Gabbro–Diorite Complex: Glimpse of the Cryogenian Mixing, Assimilation, Storage, and Homogenization Zone beneath the Eastern Desert of Egypt

Figshare (2020)

Robert J. Stern Kamal A. Ali Paul D. Asimow Mokhles K. Azer Matthew I. Leybourne

Supplementary Table 1i: Titanites.

Diorite

Homogenization

10.6084/m9.figshare.12220313

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Magmatic and hydrothermal evolution of highly-fractionated rare-metal granites at Gabal Nuweibi, Eastern Desert, Egypt

Lithos (2021)

Hilmy E. Moussa Paul D. Asimow Mokhles K. Azer Moustafa A. Abou El Maaty Adel I. M. Akarish

Porphyritic

Topaz

Muscovite

Fractional crystallization (geology)

Pegmatite

10.1016/j.lithos.2021.106405

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Citations (27)

Multistage petrogenetic evolution of Neoproterozoic serpentinized ultramafic rocks and podiform chromitites at Hagar Dungash, Eastern Desert of Egypt

Precambrian Research (2021)

Hilmy E. Moussa Heba S. Mubarak Mokhles K. Azer Adel A. Surour Paul D. Asimow

Ultramafic rock

Desert (philosophy)

10.1016/j.precamres.2021.106507

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Citations (8)

The Atud gabbro–diorite complex: glimpse of the Cryogenian mixing, assimilation, storage and homogenization zone beneath the Eastern Desert of Egypt

Journal of the Geological Society (2020)

Robert J. Stern Kamal A. Ali Paul D. Asimow Mokhles K. Azer Matthew I. Leybourne

We analysed gabbroic and dioritic rocks from the Atud igneous complex in the Eastern Desert of Egypt to understand better the formation of juvenile continental crust of the Arabian–Nubian Shield. Our results show that the rocks are the same age (U–Pb zircon ages of 694.5 ± 2.1 Ma for two diorites and 695.3 ± 3.4 Ma for one gabbronorite). These are partial melts of the mantle and related fractionates (εNd 690 = +4.2 to +7.3, 87 Sr/ 86 Sr i = 0.70246–0.70268, zircon δ 18 O ∼ +5‰). Trace element patterns indicate that Atud magmas formed above a subduction zone as part of a large and long-lived ( c . 60 myr) convergent margin. Atud complex igneous rocks belong to a larger metagabbro–epidiorite–diorite complex that formed as a deep crustal mush into which new pulses of mafic magma were periodically emplaced, incorporated and evolved. The petrological evolution can be explained by fractional crystallization of mafic magma plus variable plagioclase accumulation in a mid- to lower crustal MASH zone. The Atud igneous complex shows that mantle partial melting and fractional crystallization and plagioclase accumulation were important for Cryogenian crust formation in this part of the Arabian–Nubian Shield. Supplementary material: Analytical methods and data, calculated equilibrium mineral temperatures, results of petrogenetic modeling, and cathodluminesence images of zircons can be found at https://doi.org/10.6084/m9.figshare.c.4958822

Diorite

10.1144/jgs2019-199

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Citations (18)