Kamal A. Ali

Kamal A. Ali
United Arab Emirates University | UAEU · Department of Geology

PhD (University of Texas at Dallas)

About

60
Publications
34,198
Reads
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2,776
Citations
Citations since 2016
26 Research Items
2131 Citations
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
Additional affiliations
August 2010 - August 2019
King Abdulaziz University
Position
  • Professor (Associate)
Education
August 2004 - August 2008
University of Texas at Dallas
Field of study
  • Geosciences

Publications

Publications (60)
Article
Dike swarms and structural lineaments were investigated in the Hada Alsham area, west-central Arabian Shield of Saudi Arabia, using remote sensing, field observations, and geochemical analysis techniques. SPOT-7 digital satellite data were employed in the analysis of these structural lineaments and dike swarms. The extracted orientations of the str...
Article
Full-text available
The Sirhan-Turayf region in northwestern Saudi Arabia hosts one of the largest Paleogene phosphate-bearing deposits in the Middle East and forms part of the world’s largest accumulation of Neo-Tethys Oceanic phosphorite. The Hazm Al-Jalamid and Umm Wu’al areas in the north and northeastern parts of the Sirhan-Turayf region are the largest and most...
Article
Among several gold-sulfide deposits and prospects scattered in the Afif terrane of the Arabian Shield, the Bulghah and Al-Maham prospects are investigated to assess the spatial and temporal relationships between gold mineralization and the host lithologies and regional structures. Both prospects are hosted by the sulfide-bearing Hulayfah Group meta...
Article
Among several gold-sulfide deposits and prospects scattered in the Afif terrane of the Arabian Shield, the Bulghah and Al-Maham prospects are investigated to assess the spatial and temporal relationships between gold mineralization and the host lithologies and regional structures. Both prospects are hosted by the sulfide-bearing Hulayfah Group meta...
Chapter
Compiled U–Pb and Pb–Pb zircon ages from the Sinai Peninsula Precambrian basement record a crustal history covering of a time span of ~450 Ma, which reflects a complex history of magmatism, sedimentation, and metamorphism extending from ca. 1030–578 Ma. Three magmatic main age populations are recognized at 1025–975, 850–725, and 650–575 Ma and are...
Article
The Neoproterozoic intermediate-felsic volcanic rocks in the Wadi Ambagy area, Eastern Desert of Egypt, comprise three units: Dokhan intermediate-felsic volcanics, post-Dokhan felsic volcanics and felsites. The Dokhan lavas are generally porphyritic and composed of andesite and dacite with subordinate basalt, whereas the post-Dokhan felsic volcanic...
Article
Full-text available
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...
Chapter
Full-text available
Precambrian basement of the Egyptian sector of the Arabian-Nubian Shield are well exposed on the flanks of the Red Sea and along the border with Sudan, making it an excellent place to study Neoproterozoic processes of crustal growth, obduction–accretion tectonics, and post collisional escape tectonics. We review the published field observations, st...
Article
Field and structural studies supported by remote sensing and thermobarometeric data are attempted to decipher the deformation and metamorphic histories of Umm Gheig shear belt which represents the eastern supracrustal rocks of the Sibai core complex in the Central Eastern Desert of Egypt. Umm Gheig shear belt is build up of three major structural d...
Article
Harrat Hutaymah is a Cenozoic small-volume volcanic field in the northeastern margin of the Arabian Shield, Saudi Arabia. Mantle and lower-crustal xenoliths have been collected from the various tuff ring and maar deposits. Based on whole-rock and mineral chemistry, there are two categories of xenoliths: (1) the fertile lherzolite and moderately dep...
Article
Full-text available
The Sukhaybarat East and Red Hill deposits, in the northeastern part of the Arabian Shield, are mesothermal vein-type gold deposits hosted by late Cryogenian-Ediacaran intrusive rocks of the Idah suites (diorite, tonalite, granodiorite) and, at Sukhaybarat East, also by Ediacaran metasedimentary rocks. Gold mineralization comprises quartz-arsenopyr...
Article
Full-text available
Imperial Porphyry, a famous dimension stone of spectacular purple color, was quarried in the Mons Porphyrites area north of Jabal Dokhan in the Eastern Desert of Egypt, from the beginning of the first until the middle of the fifth century AD. During this period, the valuable material was processed as decorative stone and was used for objects of art...
Conference Paper
Full-text available
The Nabitah fault zone (NFZ), in the Southern part of the Arabian Shield, is an intra-arc suture separating between two juvenile Neoproterozoic intra-oceanic arc terranes, the Al Qarah terrane and the Tathlith-Malahah terrane. Four magmatic events involved in the formation of the Arabian Shield, island arc and pre-tectonic (∼845Ma), syncollisional...
Article
The southeastern sector of the Hafafit Metamorphic Complex, southern Eastern Desert of Egypt comprises infrastructural orthogneisses of tonalite and syenogranite parentage, amphibolites, and a volcano-sedimentary association. These are overthrust by an obducted suprastructural ophiolite nappes via the Nugrus thrust. The protolith of the biotite-hor...
Article
Full-text available
The late-Proterozoic Homrit Waggat granite complex contains Sn-F bearing quartz-muscovite greisen zone as well as fluorite veins. Fluid inclusions study in quartz and fluorite from greisen indicates the same fluid inclusion types. Fluid inclusions trapped in greisenized granite are represented mainly by two-phase (L+V) aqueous and immiscible three-...
Presentation
Full-text available
The southeastern sector of the Hafafit Metamorphic Complex, southern Eastern Desert of Egypt comprises infrastructural orthogneisses of tonalite and syenogranite parentage, amphibolites, and a volcano-sedimentary association. These are overthrust by an obducted suprastructural ophiolite nappes via the Nugrus thrust. The protolith of the biotite–hor...
Article
The Homrit Waggat granite is a composite granite pluton intruded in metamorphosed volcano-sedimentary association and the metagabbro-diorite complex to the east and north and tonalite-granodiorite suite to the south and northeast. Mineralogically and geochemically the granite phases change from subsolvus peraluminous granodiorite to hypersolvus met...
Article
Full-text available
The Homrit Waggat granite is a composite granite pluton intruded in metamorphosed volcano-sedimentary association and the metagabbro-diorite complex to the east and north and tonalite-granodiorite suite to the south and northeast. Mineralogically and geochemically the granite phases change from subsolvus peraluminous granodiorite to hypersolvus met...
Article
Full-text available
The Neoproterozoic Arabian-Nubian Shield (ANS) and the latest Mesoproterozoic to late Palaeozoic Central Asian Orogenic Belt (CAOB) are two large and long-lived accretionary orogens. Both are mostly well exposed and consist of island arcs, ophiolites and older continental fragments. There are significant similarities between the rock types and evol...
Article
Full-text available
Neoproterozoic juvenile crust is exposed in the Eastern Desert of Egypt, between the Nile and the Red Sea, forming the basement to Cambrian and younger sedimentary strata in the northernmost part of the Arabian-Nubian Shield (ANS). In order to reveal how the crust of this vast region was formed, four examples of widespread Neoproterozoic (653-595 M...
Article
Full-text available
Neoproterozoic juvenile crust is exposed in the Eastern Desert of Egypt, between the Nile and the Red Sea, forming the basement to Cambrian and younger sedimentary strata in the northernmost part of the Arabian-Nubian Shield (ANS). In order to reveal how the crust of this vast region was formed, four examples of widespread Neoproterozoic (653-595 M...
Article
The Harrat Kishb area of western Saudi Arabia is part of the Cenozoic volcanic fields in the western margin of the Arabian Shield. Numerous fresh ultramafic xenoliths are entrained in the basanite lava of Harrat Kishb, providing an opportunity to study the nature and petrogenetic processes involved in the evolution of the lithospheric mantle beneat...
Research
Full-text available
The late-Proterozoic Homrit Waggat granite complex contains Sn-F bearing quartz-muscovite greisen zone as well as fluorite veins. Fluid inclusions study in quartz and fluorite from greisen indicates the same fluid inclusion types. Fluid inclusions trapped in greisenized granite are represented mainly by two–phase (L+V) aqueous and immiscible three-...
Article
Migmatitic granitoid gneisses are widespread in the southern Eastern Desert of Egypt, but their formation ages are poorly understood. They consist of granitoid gneiss ranging in composition from tonalite to granodiorite, with a distinct calc-alkaline chemical character. Zircons from three migmatitic gneiss samples from Wadi Beitan were dated on SHR...
Article
The Jabal Al-Hassir ring complex in the southern Arabian Shield is an alkaline granite complex comprising an inner core of biotite granite that outwardly becomes a porphyritic sodic-calcic amphibole (ferrobarroisite - katophorite) granite. A combined study of mineral chemistry and single zircon Hf-O zircon isotope analyses was carried out to infer...
Article
A combined study of single zircon U-Pb dating, Hf-O zircon isotopic analyses and whole-rock Nd isotopic compositions was carried out to infer the magma sources of Neoproterozoic post-collisional A-type granitoids in Saudi Arabia. U-Pb zircon dating of magmatic zircons of two samples from the Hadb adh Dayheen ring complex yielded ages of 625 ± 11 Ma...
Article
We describe a new amalgamation zone between Jiddah and Asir juvenile arc terranes in the western Arabian Shield. Ophiolitic rocks in this zone were deformed by a NE-SW oriented belt of opposite-verging overturned folds and thrust faults, whereas two granitic complexes intruded mainly through its axial uplift. Chemical characteristics of these rocks...
Article
Full-text available
The depositional age of the Wadi Zaghra metasediments (Zaghra Formation) of the Sa’al-Zaghra metamorphic complex (Sinai) in the Arabian–Nubian Shield (ANS) has been constrained by LA-ICP-MS dating of zircons from (1) metaconglomerate granitoid clasts, (2) the metaconglomerate matrix, (3) biotite-schist, and (4) diorites and granites intruding the m...
Article
New 40Ar/39Ar ages, based on incremental heating techniques for groundmass separates of 25 samples, are presented for the Harrat Al-Madinah volcanic field, part of Harrat Rahat in the north western part of the Arabian plate. This area is an active volcanic field characterized by the occurrence of two historical eruptions approximately in 641 and 12...
Article
Full-text available
The Wadi Allaqi ophiolite along the Egyptian-Sudanese border defines the southernmost ophiolitic assemblage and suture zone in the Eastern Desert. Ophiolite assemblages comprise nappes composed mainly of mafic and ultramafic rocks that were tectonically emplaced and replaced by serpentine and carbonates along shear zones probably due to CO2-metasom...
Article
Full-text available
The East African Orogen, extending from southern Israel, Sinai and Jordan in the north to Mozambique and Madagascar in the south, is the world´ s largest Neoproterozoic to Cambrian orogenic complex. It comprises a collage of individual oceanic domains and continental fragments between the Archean Sahara–Congo–Kalahari Cratons in the west and Neopro...
Article
The Southern Ethiopian Shield (SES) in the central East African Orogen lies at the junction of Neoproterozoic (880–550 Ma) largely greenschist-facies juvenile crust of the Arabian-Nubian Shield in the north and more metamorphosed and remobilized older crust of the Mozambique Belt to the south. The SES exposes a polycyclic sialic gneissic basement (...
Article
The calc-alkaline, gneissic El Shalul granite is the westernmost gneiss dome or core complex within the Arabian–Nubian Shield. Previous studies have indicated that it represents either a window into the underlying pre-Neoproterozoic Sahara metacraton or a melt derived from the metacraton. U–Pb LA-ICP-MS dating of magmatic zircons from two samples o...
Article
Full-text available
The Kid Group is one of the few exposures of Neoproterozoic metavolcano-sedimentary rocks in the basement of southern Sinai in the northernmost Arabian–Nubian Shield. It is divided into the mostly metamorphosed volcaniclastic Melhaq and siliciclastic Um Zariq formations in the north and the mostly volcanic Heib and Tarr formations in the south. The...
Article
Full-text available
The Humr Akarim and Humrat Mukbid plutons, in the central Eastern Desert of Egypt, are late Neoproterozoic post-collisional alkaline A-type granites. Humr Akarim and Humrat Mukbid plutonic rocks consist of subsolvus alkali granites and a subordinate roof facies of albite granite, which hosts greisen and Sn–Mo-mineralized quartz veins; textural and...
Article
Whole-rock geochemical and Sr, Nd and Pb isotope data are presented for the Harrat Al-Madinah volcanic field, in the north western part of the Arabian plate, aiming to understand their origin and the composition of their mantle source. This area is an active volcanic field characterized by the occurrence of two historic eruptions approximately in 6...
Chapter
Full-text available
Arabian–Nubian Shield (ANS), including structural framework, stratigraphy, lithological descriptions and relationships with younger and older units, banded iron formation chemostratigraphy, other characteristics, geochronological constraints, and discussion. The ANS is a broad tract of juvenile continental crust, formed from accreted arc-backarc ba...
Article
The Hadb adh Dayheen ring complex (HDRC), Central Arabian Shield, is an alkaline to peralkaline A-type granite complex. It consists of an inner core of monzogranite followed outward by porphyritic alkali feldspar granite (hornblende biotite granite and aegirine riebeckite granite). Field and textural observations indicate that the different granite...
Article
The ophiolitic metabasalts (pillowed and sheeted dikes) of Wadi Ghadir area, Eastern Desert, Egypt, were analyzed for their major, trace and rare earth elements, Nd and Sr isotopes and the chemistry of their plagioclase, amphibole and chlorite was also reported. Geochemically these rocks range from tholeiitic basalt to basaltic andesite. The genera...
Article
New geochemical, Nd-isotope and U–Pb zircon data from Neoproterozoic volcanic rocks from Wadi Sawawin in northwestern Saudi Arabia provide important constraints on the evolution of the crust in this part of the Arabian–Nubian Shield (ANS). The Ghawjah volcanic rocks range from tholeiitic to calc-alkaline and are metamorphosed to greenschist facies....
Article
Ophiolites are key components of the Neoproterozoic Arabian–Nubian Shield (ANS). Understanding when they formed and were emplaced is crucial for understanding the evolution of the ANS because their ages tell when seafloor spreading and terrane accretion occurred. The Yanbu–Onib–Sol Hamed–Gerf–Allaqi–Heiani (YOSHGAH) suture and ophiolite belt can be...
Article
Full-text available
Igneous rocks of the Arabian-Nubian Shield (ANS) have lithologic associations (ophiolites, calc-alkaline igneous rocks, immature sediments) and radio-genic isotopic compositions consistent with formation as juvenile continental crust as a result of accreting intraoceanic arc systems during 880 to 630 Ma, with crustal differentiation continuing unti...
Article
Full-text available
The Neoproterozoic Atud diamictite in Wadi Kareim and Wadi Mobarak in the Eastern Desert of Egypt and the Nuwaybah formation in NW Saudi Arabia consist of poorly sorted, polymictic breccia, with clasts up to 1m of granitoid, quartz porphyry, quartzite, basalt, greywacke, marble, arkose, and microconglomerate in fine-grained matrix. Stratigraphic re...
Technical Report
Full-text available
The JEBEL Field conference in Sinai (Oct. 25-29, 2008) provided an opportunity to investigate two unresolved issues in the basement of Sinai: 1) the possible exposure of ~1Ga crust in the northernmost Sinai basement (Zaghra metaconglomerate), and 2) the age of the Kid metamorphic core complex (fi g. 1). These are two of the most important metamorph...
Article
Submarine tholeiitic and calc-alkaline basalt and andesite with subordinate dacite, metamorphosed to greenschist facies, are exposed at Wadi Kareim and Wadi El Dabbah, Central Eastern Desert of Egypt. These metavolcanic sequences are representative of early stages of Neoproterozoic crust formation in the northern part of the Arabian-Nubian Shield....
Article
Full-text available
There is an increasing evidence for the involvement of pre-Neoproterozoic zircons in the Arabian–Nubian Shield, a Neoproterozoic crustal tract that is generally regarded to be juvenile. The source and significance of these xenocrystic zircons are not clear. In an effort to better understand this problem, older and younger granitoids from the Egypti...

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Projects (3)
Project
Tectonic model based on distinguishing between dike types, and their tectonic environment.