Petrogenesis of the ~740 Korab Kansi mafic-ultramafic intrusion, South Eastern Desert of Egypt: Evidence of Ti-rich ferropicritic magmatism

Khedr, Mohamed Zaki; El-Awady, Amr; Arai, Shoji; Hauzenberger, Christoph; Tamura, Akihiro; Stern, Robert J.; Morishita, Tomoaki

doi:10.1016/j.gr.2019.12.013

Cited by 34 publications

(15 citation statements)

References 98 publications

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“…Currently, the FT ages may be determined rapidly and safely employing laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) technique for in-situ quantification of U-238 (ICP-MS: Yokogawa Analytical Systems, Japan; MicroLas: GeoLas Q-plus by MicroLas, Germany) [6,18]. The ability of LA-ICP-MS to measure rare earth elements simultaneously with U, Th, Sr, Y, Mn, Mg, Cl, and isotopic ratios-as done in many modern studies including this work-gives complementary chemical composition of apatite (or zircon, titanite) which may be used for simultaneous double dating of individual crystals by U-Pb and FT techniques as well as for petrogenetic, metallogenetic and provenance studies [19,20].…”

Section: Introductionmentioning

confidence: 99%

Combined Zircon/Apatite U-Pb and Fission-Track Dating by LA-ICP-MS and Its Geological Applications: An Example from the Egyptian Younger Granites

et al. 2021

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Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS) is classically used in U-Pb dating to measure U and Pb isotopic concentrations. Recently, it has become frequently used in fission-track (FT) chronometry too. As an advantage, the U-Pb and FT double dating will enable efficiently determining the crystallization ages and the thermo-tectonic history concurrently as samples volume, analytical time, efforts, and cost will be greatly reduced. To demonstrate the validity of this approach, a Younger granite (Ediacaran age) sample from North Eastern Desert (NED), Egypt was analyzed for U-Pb and FT double dating. The integration of multiple geochronologic data yielded a zircon U-Pb crystallization age of 599 ± 30 Ma, after emplacement, the rock cooled /uplifted rapidly to depths of 9–14 km as response to the post-Pan African Orogeny erosional event as indicated by apatite U-Pb age of 474 ± 9 Ma. Afterwards, the area experienced a slow cooling/exhumation for a short period, most-likely as response to denudation effect. During the Devonian, the area was rapidly exhumed to reach depths of 1.5–3 km as response to the Hercynian tectonic event, as indicated by a zircon FT age of 347 ± 16 Ma. Then the studied sample has experienced a relatively long period of thermal stability between the Carboniferous and the Eocene. During the Oligocene-Miocene, the Gulf of Suez opening event affected the area by crustal uplift to its current elevation. This integration of Orogenic and thermo-tectonic information reveals the validity, efficiency, and importance of double dating of U-Pb and FT techniques using LA-ICP-MS methodology.

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Section: Introductionmentioning

confidence: 99%

Combined Zircon/Apatite U-Pb and Fission-Track Dating by LA-ICP-MS and Its Geological Applications: An Example from the Egyptian Younger Granites

et al. 2021

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“…GAN Fe–Ti minerals indicate the compositional range from near the magnetite end member (Fe 3 O 4 ) to near the ilmenite end member (FeTiO 2 ), similar to Fe–Ti ore deposits in Korab Kansi, SED, Egypt 19 (Fig. 9 f).…”

Section: Resultsmentioning

confidence: 59%

“…Orthopyroxenes (Opxs) are observed in olivine –and pyroxene gabbros. They are of enstatite composition (En 68.95–72.08 ), with a limited range of Mg# (0.81–0.87), low Cr 2 O 3 contents (< 0.1 wt.%), and high TiO 2 (0.22–0.36wt%; Table 1 ; Supplementary 2 ) in comparison with Opx in the ophiolitic rocks of Egypt 19 . GAN Opx plots in the transition zone between igneous and metamorphic orthopyroxenes (Fig.…”

Section: Resultsmentioning

confidence: 99%

Integrating mineralogy, geochemistry and aeromagnetic data for detecting Fe–Ti ore deposits bearing layered mafic intrusion, Akab El-Negum, Eastern Desert, Egypt

Kharbish

Eldosouky²,

Amer³

2022

Sci Rep

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This study delineated the Fe–Ti oxide deposit concurrencies on the layered mafic intrusion in Gabal Akab El-Negum (GAN), South Eastern Desert, Egypt, using aeromagnetic mapping and chemical analysis of the hosted mafic rocks and mineralogical studies. Aeromagnetic data was improved using the enhanced horizontal gradient amplitudeto detect the primary structures (edges/contacts/faults) that control the distribution of Fe–Ti ore deposit. GAN layered gabbros are differentiated into troctolite, olivine–, pyroxene–, and hornblende–gabbros. These mafic rocks primarily comprise plagioclase, olivine, pyroxene, and hornblende with Fe–Ti ores (magnetite and ilmenite). The significant variation in Mg# of clinopyroxene between 0.70 and 0.82 indicates the importance of fractional crystallization in developing layered mafic intrusion. Clinopyroxene and plagioclase thermometry yielded low temperatures similar to the fractionated primary basaltic magma. The pairs of magnetite–ilmenite minerals in gabbros provide equilibrium temperatures of 539.44–815.56, and high fO2, reflecting various cooling and subsolidus reequilibration phases of minerals. The enrichment of GAN gabbros in light rare–earth elements relative to heavy rare–earth elements indicates the interaction between the Fe–Ti rich mantle and the fractionated tholeiitic magmas in the back-arc setting, generating Fe–Ti oxide ores.

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“…Several Neoproterozoic post-collisional layered mafic-ultramafic intrusions are documented in the Arabian-Nubian Shield of Egypt (e.g., Motaghairat, Imleih, Korab Kansi, and Shahira; Khedr et al 2020 and references therein). Most of the intrusions comprise ~ 10% ultramafic cumulates overlain by layered olivine gabbro, troctolite, gabbro, and hornblende gabbro derived from a tholeiitic to calc-alkaline parent magma (Abdel Halim et al 2016;Khedr et al 2020). The Korab Kansi intrusion differs from the other intrusions since it is host to economic Fe-Ti-V oxide mineralisation within its upper gabbroic interval.…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

“…The Korab Kansi intrusion differs from the other intrusions since it is host to economic Fe-Ti-V oxide mineralisation within its upper gabbroic interval. It is hypothesised that partial melting of metasomatized mantle produced Fe-and Ti-rich ferropicritic melts leading to the formation of oxide deposits (Khedr et al 2020).…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

The geotectonic setting, age and mineral deposit inventory of global layered intrusions

Smith

Maier

2021

Earth-Science Reviews

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Petrogenesis of the ~740 Korab Kansi mafic-ultramafic intrusion, South Eastern Desert of Egypt: Evidence of Ti-rich ferropicritic magmatism

Cited by 34 publications

References 98 publications

Combined Zircon/Apatite U-Pb and Fission-Track Dating by LA-ICP-MS and Its Geological Applications: An Example from the Egyptian Younger Granites

Combined Zircon/Apatite U-Pb and Fission-Track Dating by LA-ICP-MS and Its Geological Applications: An Example from the Egyptian Younger Granites

Integrating mineralogy, geochemistry and aeromagnetic data for detecting Fe–Ti ore deposits bearing layered mafic intrusion, Akab El-Negum, Eastern Desert, Egypt

The geotectonic setting, age and mineral deposit inventory of global layered intrusions

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