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Petrogenesis of contrasting magmatic suites in the Abu Kharif area, Northern Eastern Desert, Egypt: implications for Pan-African crustal evolution and tungsten mineralization

Published online by Cambridge University Press:  30 November 2021

Nora G Abdel Wanees Open the ORCID record for Nora G Abdel Wanees [Opens in a new window] ,
Mohamed M El-Sayed Open the ORCID record for Mohamed M El-Sayed [Opens in a new window] ,
Khalil I Khalil  and
Hossam A Khamis
Nora G Abdel Wanees*
Affiliation:
Geology Department, Faculty of Science, Damanhour University, Damanhour, Egypt
Mohamed M El-Sayed
Affiliation:
Geology Department, Faculty of Science, Damanhour University, Damanhour, Egypt
Khalil I Khalil
Affiliation:
Geology Department, Faculty of Science, Alexandria University, Alexandria, Egypt
Hossam A Khamis
Affiliation:
Nuclear Materials Authority, Maadi, Cairo, Egypt
*
Author for correspondence: Nora Gamal Abdel Wanees, Email: [email protected]
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Abstract

The Abu Kharif area in the Northern Eastern Desert consists of contrasting granitic magma suites: a Cryogenian granodiorite suite (850–635 Ma), an Ediacaran monzogranite suite (635–541 Ma) and a Cambrian alkali riebeckite granite suite (541–485 Ma). Tungsten mineralization occurs within W-bearing quartz veins and a disseminated type confined to the monzogranite.

Whole-rock geochemical data classify the granodiorite as a late-orogenic I-type with calc-alkaline affinity, while the monzogranite and alkali riebeckite granite represent respectively a post-orogenic highly fractionated I-type with calc-alkaline affinity and an anorogenic A1-subtype with alkaline affinity. Geochemical modelling indicates that the three intrusions represent separate magmatic pulses where the granodiorite was generated by ∼75 % batch partial melting of an amphibolitic source followed by fractional crystallization of hornblende, biotite, apatite and titanite. The monzogranite was formed by 62 % batch partial melting of the normal ‘non-metasomatized’ Pan-African crust of calc-alkaline granite composition followed by fractional crystallization of plagioclase, biotite, K-feldspar, magnetite, ilmenite, with minor apatite and titanite. The alkali riebeckite granite was generated by 65 % batch partial melting of metasomatized Pan-African granite source followed by fractional crystallization of plagioclase, K-feldspar, amphibole and biotite with minor magnetite, apatite and titanite. In general, the parent magmas of the three intrusions were originally enriched in W, but with different concentrations. This W-enrichment would be caused by magmatic-related hydrothermal volatile-rich fluids and concentrated within the monzogranite.

Keywords

Pan-African crustgranitesgeochemistryW-mineralizationpetrogenetic modelsEastern Egypt Desert
Type
Discussion - Reply
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Geological Magazine , Volume 159 , Issue 3 , March 2022 , pp. 441 - 467
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© The Author(s), 2021. Published by Cambridge University Press

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