Petrogenetic Evolution of the Neoproterozoic Igneous Rocks of Egypt

Azer, Mokhles K.; Asimow, Paul D.

doi:10.1007/978-3-030-49771-2_13

Cited by 12 publications

(5 citation statements)

References 240 publications

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“…The evolution of the ANS took place over 350 million years, from 870 Ma until about 520 Ma, when the great peneplain was cut and thick Cambro-Ordovician sandstones were deposited (Azer and Asimow, 2021). The ANS evolved through a series of stages that can be characterized as (1) supercontinent rift and drift (1000-900 Ma), (2) subduction and consumption of intervening ocean basins (870-750 Ma), (3) continental collision and orogeny (750-630 Ma), and (4) postorogenic extension and collapse (620-580 Ma plus minor later activity extending to 520 Ma).…”

Section: Discussionmentioning

confidence: 99%

Magmatic and post-magmatic evolution of post-collisional rare-metal bearing granite: The Neoproterozoic Homrit Akarem Granitic Intrusion, south Eastern Desert of Egypt, Arabian-Nubian Shield

et al. 2022

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Section: Discussionmentioning

confidence: 99%

Magmatic and post-magmatic evolution of post-collisional rare-metal bearing granite: The Neoproterozoic Homrit Akarem Granitic Intrusion, south Eastern Desert of Egypt, Arabian-Nubian Shield

et al. 2022

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“…The geodynamic model of the Igla Ahmr granites is shown in Figure 15. The Igla Ahmr tonalites are old granitic phases in the studied area, and show characteristic features of I-Type (Figures 12e, 13b and 14c); these tonalites originated from mantle-derived melts and contaminated with crustal materials (~670-630 Ma; [79]) during the syn-collisional stage (Figure 15a). Then, there is a transitional stage and a change in the tectonic style from the compressional setting and formation of syn-collisional granites (e.g., I-type tonalites, Figure 4a,b) to the extensional setting and formation of post-collisional granites (e.g., A-type syenogranites and alkali feldspar granites, Figure 4c-f).…”

Section: Geodynamic Evolution and Development Of The Ced Juvenile Crustmentioning

confidence: 99%

Genesis of Rare Metal Granites in the Nubian Shield: Tectonic Control and Magmatic and Metasomatic Processes

Khedr,

Abo Khashaba,

Takazawa

et al. 2024

Minerals

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The Igla Ahmr region in the Central Eastern Desert (CED) of Egypt comprises mainly syenogranites and alkali feldspar granites, with a few tonalite xenoliths. The mineral potential maps were presented in order to convert the concentrations of total rare earth elements (REEs) and associated elements such as Zr, Nb, Ga, Y, Sc, Ta, Mo, U, and Th into mappable exploration criteria based on the line density, five alteration indices, random forest (RF) machine learning, and the weighted sum model (WSM). According to petrography and geochemical analysis, random forest (RF) gives the best result and represents new locations for rare metal mineralization compared with the WSM. The studied tonalites resemble I-type granites and were crystallized from mantle-derived magmas that were contaminated by crustal materials via assimilation, while the alkali feldspar granites and syenogranites are peraluminous A-type granites. The tonalites are the old phase and are considered a transitional stage from I-type to A-type, whereas the A-type granites have evolved from the I-type ones. Their calculated zircon saturation temperature TZr ranges from 717 °C to 820 °C at pressure < 4 kbar and depth < 14 km in relatively oxidized conditions. The A-type granites have high SiO2 (71.46–77.22 wt.%), high total alkali (up to 9 wt.%), Zr (up to 482 ppm), FeOt/(FeOt + MgO) ratios > 0.86, A/CNK ratios > 1, Al2O3 + CaO < 15 wt.%, and high ΣREEs (230 ppm), but low CaO and MgO and negative Eu anomalies (Eu/Eu* = 0.24–0.43). These chemical features resemble those of post-collisional rare metal A-type granites in the Arabian-Nubian Shield (ANS). The parent magma of these A-type granites was possibly derived from the partial melting of the I-type tonalitic protolith during lithospheric delamination, followed by severe fractional crystallization in the upper crust in the post-collisional setting. Their rare metal-bearing minerals, including zircon, apatite, titanite, and rutile, are of magmatic origin, while allanite, xenotime, parisite, and betafite are hydrothermal in origin. The rare metal mineralization in the Igla Ahmr granites is possibly attributed to: (1) essential components of both parental peraluminous melts and magmatic-emanated fluids that have caused metasomatism, leading to rare metal enrichment in the Igla Ahmr granites during the interaction between rocks and fluids, and (2) structural control of rare metals by the major NW–SE structures (Najd trend) and conjugate N–S and NE–SW faults, which all are channels for hydrothermal fluids that in turn have led to hydrothermal alteration. This explains why rare metal mineralization in granites is affected by hydrothermal alteration, including silicification, phyllic alteration, sericitization, kaolinitization, and chloritization.

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“…The formation of igneous rocks due to the cooling of magma (Azer & Asimow, 2021;Gill & Fitton, 2022). Rocks are solid aggregates formed by minerals that have solidified from natural processes (El Alami et al, 2020;Sultoni et al, 2019).…”

Section: The Process Of Rock Formation At Bukit Cintamentioning

confidence: 99%

Elements of Metamorphic Rocks (Marble and Quartzite) of Bukit Cinta Gunung Gajah, Klaten

Hiryanto,

Sujarwo,

Tristanti

et al. 2023

jppipa, pendidikan ipa, fisika, biologi, kimia

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Rocks such as metamorphic and sedimentary are natural constructions. Rocks in natural construction become elementary materials that form the landscape of the area, including in nature-based tourism objects, Bukit Cinta in Gunung Gajah, Klaten, Central Java. The purpose of this research is to describe the elements of rocks in the place. The study method used is descriptive qualitative method and tends to use analysis. The theoretical basis is used as a basic reference in preparing the study report to match the conditions in the field. In addition, the theoretical basis can also provide an overview of the background of the study as material for discussion. The ability to collect data is an important factor in determining the validation of the study conducted. Data collection in this case is obtained secondarily, namely through documents or literature studies. The results of the study found that there are 3 main supporters for the strong landscape in the tourist ojek of Gunung Gajah love hill. The three are metamorphic rocks observed there are fillic metamorphic relief, marble metamorphic rocks, and quartzite metamorphic rocks; limestone sedimentary rocks. Limestone can be used for building materials, road paving, and house foundations; and Diorte igneous rocks. Diorte igneous rocks can be used as home decoration.

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Petrogenetic Evolution of the Neoproterozoic Igneous Rocks of Egypt

Cited by 12 publications

References 240 publications

Magmatic and post-magmatic evolution of post-collisional rare-metal bearing granite: The Neoproterozoic Homrit Akarem Granitic Intrusion, south Eastern Desert of Egypt, Arabian-Nubian Shield

Magmatic and post-magmatic evolution of post-collisional rare-metal bearing granite: The Neoproterozoic Homrit Akarem Granitic Intrusion, south Eastern Desert of Egypt, Arabian-Nubian Shield

Genesis of Rare Metal Granites in the Nubian Shield: Tectonic Control and Magmatic and Metasomatic Processes

Elements of Metamorphic Rocks (Marble and Quartzite) of Bukit Cinta Gunung Gajah, Klaten

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