The common origin and alteration history of the hypabyssal and volcanic phases of the Wadi Tarr albitite complex, southern Sinai, Egypt

Azer, Mokhles K.; Gahlan, Hisham A.; Asimow, Paul D.; Al‐Kahtany, Khaled

doi:10.1016/j.lithos.2018.12.015

Cited by 8 publications

(4 citation statements)

References 77 publications

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“…The mode of emplacement of the ADAG is very similar to the Tarr albitite in southern Sinai (Azer et al, 2010(Azer et al, , 2019b and the Nuweibi albite granite in the Eastern Desert of Egypt (Azer et al, 2019a), despite the obvious differences in their chemical compositions. Each of these intrusions is divided into hypabyssal and porphyritic varieties suggesting that a gradient in emplacement depth extending to very shallow crustal levels is preserved and exposed in each case.…”

Section: Evidence For Magmatic Vs Metasomatic Effectsmentioning

confidence: 76%

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

Amarah

Azer

Asimow

et al. 2021

Acta Geologica Sinica (Eng)

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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.

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Section: Evidence For Magmatic Vs Metasomatic Effectsmentioning

confidence: 76%

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

Amarah

Azer

Asimow

et al. 2021

Acta Geologica Sinica (Eng)

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“…Pre-collisional and syn-orogenic calc-alkaline magmatism (650-620 Ma), characteristic of the subduction period of the north ANS, was succeeded by post-collisional magmatism (e.g., Jarrar, Manton, Stern, & Zachmann, 2008;Moussa, Stern, Manton, & Ali, 2008;Azer & El-Gharbawy, 2011;El Hadek, Mohamed, El Habaak, Bishara, & Ali, 2016;Sami et al, 2017;Azer, Gahlan, Asimow, & Al-Kahtany, 2019,Azer, Abdelfadil, & Ramadan, 2019Abdallah, Azer, & El Shammari, 2019) including high-K calc-alkaline and alkaline rocks.…”

Section: Introductionmentioning

confidence: 99%

“…Pre‐collisional and syn‐orogenic calc‐alkaline magmatism (650–620 Ma), characteristic of the subduction period of the north ANS, was succeeded by post‐collisional magmatism (e.g., Jarrar, Manton, Stern, & Zachmann, ; Moussa, Stern, Manton, & Ali, ; Azer & El‐Gharbawy, ; El Hadek, Mohamed, El Habaak, Bishara, & Ali, ; Sami et al, ; Azer, Gahlan, Asimow, & Al‐Kahtany, ,Azer, Abdelfadil, & Ramadan, ; Abdallah, Azer, & El Shammari, ) including high‐K calc‐alkaline and alkaline rocks. The post‐collisional granitoid rocks of the north ANS, including those outcropping in the Eastern Desert of Egypt, provide significant information on these late magmatic phases and their contributions to the growth of the upper continental crust.…”

Section: Introductionmentioning

confidence: 99%

Tracking the transition from subduction‐related to post‐collisional magmatism in the north Arabian–Nubian Shield: A case study from the Homrit Waggat area of the Eastern Desert of Egypt

et al. 2019

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Field and geochemical observations of the granitoids of the Homrit Waggat area in the central Eastern Desert of Egypt reveal two magmatic phases. The early phase of weakly deformed subduction-related calc-alkaline rocks includes tonalite and granodiorite. We name the later phase the Homrit Waggat Pluton (HWP); it includes undeformed syenogranite, alkali feldspar granite, and minor albitized granite. The tonalite and granodiorite have distinct negative Nb-Ta anomalies and lower alkalis, REE, Nb, Zr, and Hf than the HWP. The early magmatic pulse is a subduction-related suite, likely generated by underplating of mantle-derived magmas that triggered partial melting of mafic lower crust; mixing of these melts led to intermediate magma that further fractionated to tonalite and granodiorite. The HWP granites of the late magmatic pulse are transitional from a subduction-related to an anorogenic within-plate environment, plausibly generated by post-collisional lithosphere delamination. Although the parent magma of the HWP was I-type, extensive fractional crystallization produced residual liquids with A 2 -type character. Albitized granites are found only along the outer margin of the HWP, and contacts with the alkali feldspar granite are gradational, suggesting fluid interactions at a late stage of crystallization. The original textures of the albitized granites are preserved, but their bulk composition was modified by the production of Narich minerals and the removal of K, REE, and some trace elements by fluids.

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“…The basement complex of Egypt, especially the Sinai Peninsula, is a part of the Arabian-Nubian Shield (ANS). This area can be divided into three groups, from oldest to youngest: (1) a metamorphic unit made up of low-to medium-metamorphosed volcanosedimentary rocks, (2) calc-alkaline granites, and (3) within-plate granites (e.g., [37][38][39][40][41][42][43]). However, the distribution of granitoids within this area is not homogeneous.…”

Section: Introductionmentioning

confidence: 99%

Remote Sensing, Petrological and Geochemical Data for Lithological Mapping in Wadi Kid, Southeast Sinai, Egypt

Fahmy,

El-Desoky,

Elyaseer

et al. 2023

Minerals

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The Wadi Samra–Wadi Kid district in southeastern Sinai, Egypt, has undergone extensive investigation involving remote sensing analysis, field geology studies, petrography, and geochemistry. The main aim of this study is the integration between remote sensing applications, fieldwork, and laboratory studies for accurate lithological mapping for future mineral exploration in the study region. The field relationships between these coincident rocks were studied in the study area. Landsat-8 (OLI) data that cover the investigated area were used in this paper. The different rock units in the study area were studied petrographically using a polarizing microscope, in addition to major and trace analysis using ICP-OES tools. The Operational Land Imager (OLI) images were used with several processing methods, such as false color composite (FCC), band ratio (BR), principal component analysis (PCA), and minimum noise fraction (MNF) techniques for detecting the different types of rock units in the Wadi Kid district. This district mainly consists of a volcano-sedimentary sequence as well as diorite, gabbro, granite, and albitite. Geochemically, the metasediments are classified as pelitic graywackes derived from sedimentary origin (i.e., shales). The Al2O3 and CaO contents are medium–high, while the Fe2O3 and TiO2 contents are very low. Alkaline minerals are relatively low–medium in content. All of the metasediment samples are characterized by high MgO contents and low SiO2, Fe2O3, and CaO contents. The granitic rocks appear to have alkaline and subalkaline affinity, while the subalkaline granites are high-K calc-alkaline to shoshonite series. The alkaline rocks are classified as albitite, while the calc-alkaline series samples vary from monzodiorites to granites. The outcomes of this study can be used for prospecting metallic and industrial mineral exploration in the Wadi Kid district.

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The common origin and alteration history of the hypabyssal and volcanic phases of the Wadi Tarr albitite complex, southern Sinai, Egypt

Cited by 8 publications

References 77 publications

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

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

Tracking the transition from subduction‐related to post‐collisional magmatism in the north Arabian–Nubian Shield: A case study from the Homrit Waggat area of the Eastern Desert of Egypt

Remote Sensing, Petrological and Geochemical Data for Lithological Mapping in Wadi Kid, Southeast Sinai, Egypt

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