La littérature semble assez pauvre en ce qui concerne la fluorite en Egypte.
On sait que les ancienne sociétés égyptiennes ont utilisé de la fluorine dans leurs ornements royaux, ceci grâce à des études anthropologiques, sociologiques et archéologiques.

Voici quelques données que nous avons pu glaner, ça et là...

Titre du document / Document title
Study on the colour of some Egyptian fluorite samples

Auteur(s) / Author(s)
ASHRY H. A. ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
Atomic enery authority, national cent. radiation res. technology, Heliopolis Cairo, EGYPTE

Revue / Journal Title
Indian journal of pure & applied physics ISSN 0019-5596 CODEN IJOPAU

Source / Source 1993, vol. 31, no6, pp. 402-404 (5 ref.)

Langue / Language
Anglais

Editeur / Publisher
Council of Scientific & Industrial Research, New Delhi, INDE (1963) (Revue)

Mots-clés anglais / English Keywords
fluorite ; fluorides ; Egypt ; color ; photometry ; chemical composition ; X-ray fluorescence ; irradiation ; gamma rays ; color centers ; reflectance ; X-ray spectra ; North Africa ;

Mots-clés français / French Keywords
Fluorite ; Fluorure ; Egypte ; Couleur ; Photométrie ; Analyse chimique ; Fluorescence RX ; Irradiation ; Rayonnement gamma ; Centre coloré ; Pouvoir réflecteur ; Spectre RX ; Spectrophotométrie ; Afrique du Nord ;

Mots-clés espagnols / Spanish Keywords
Fluorita ; Fluoruro ; Egipto ; Color ; Fotometría ; Análisis químico ; Fluorescencia RX ; Irradiación ; Rayos gamma ; Centro color ; Poder reflector ; Espectro RX ; Africa del norte ;

Localisation / Location
INIST-CNRS, Cote INIST : 2364 B, 35400003517944.0110

http://cat.inist.fr

Post-orogenic and anorogenic A-type fluorite-bearing granitoids, Eastern Desert, Egypt:
Petrogenetic and geotectonic implications

Fathy H. Mohameda and Mohamed M. El-Sayeda,

The Corresponding Author aGeology Department, Faculty of Science, Alexandria University, Alexandria, Egypt
Received 28 September 2004; accepted 9 May 2005. Available online 27 February 2007.

Abstract
The present study focuses on four A-type fluorite-bearing granitic plutons in the Eastern Desert of Egypt which are classified into post-orogenic subsolvus (Homrit Waggat, 535 Ma; Homer Akarem, 541 Ma and Ineigi, 571 Ma) and anorogenic hypersolvus (Gabal Gharib, 476 Ma) granites. All the granites are Si- and alkali-rich and Mgsingle bondCasingle bondTi poor. Whereas both granite types appear relatively homogeneous in terms of most of their major and trace elements, they differ in that the subsolvus granites are depleted in TiO2, FeO*, Ba, Sr and Zr and enriched in Rb and Y with respect to the hypersolvus granites. The two granite types, however, can be distinguished more easily by their rare-earth element (REE) patterns. Chondrite-normalized REE patterns of the hypersolvus granite display a gull-wing shape, characterized by a large negative Eu anomaly and moderate-to-high LREE contents. Relative to the hypersolvus granite, subsolvus granite is depleted in LREE and more enriched in HREE contents. The increase of HREE in the subsolvus granite is presumably caused by F complexing during the late stage of its evolution. This is supported by the abundance of fluorite veins cross-cutting the subsolvus granite. The negative Eu anomalies in the subsolvus granite point to the role of feldspars as residual phase in the source, and as a crystallizing phase during magmatic differentiation. Field relations, textural, mineralogical and geochemical data of the post-orogenic subsolvus granite are consistent with its derivation from a parental basic magma through crystal–liquid fractionation of alkali feldspar, plagioclase, amphibole, Fesingle bondTi oxides, titanite, zircon, monazite and allanite. Crystallization occurred in a water-enriched and rather oxidizing environment, as a result of which the entire suite has a transitional character between that of a post-orogenic and an anorogenic setting. On the other hand, the most credible mechanism for the origin of the anorogenic hypersolvus granite is partial melting of I-type granodiorite–monzogranite source rocks in the study area.

Keywords: A-type granitoids; Egypt; F complexing; Fractional crystallization; Geochemistry;

Partial melting Article Outline 1. Introduction 2. Regional geological setting 2.1. Homrit Waggat granite 2.2. Homer Akarem granite 2.3. Ineigi granite 2.4. Gabal Gharib granite 3. Petrography 3.1. Subsolvus granite 3.2. Hypersolvus granite 4. Geochemistry 4.1. Analytical methods 4.2. Major and trace element characteristics for the granites 4.3. Rare-earth elements 5. Discussion 5.1. Granite-type and tectonic setting 5.2. Petrogenetic aspects 5.2.1. Subsolvus granite 5.2.1.1. Role of F-rich fluids 5.2.2. Hypersolvus granite 6. Conclusions Acknowledgements

References Thumbnail image Fig. 1. Map showing the distribution of post-orogenic alkaline granitoids in the Eastern Desert of Egypt in relation to major structural elements (Garson and Krs, 1976).

National History Department, Faculty of Education at Kafr El-Sheikh Tanta University, Tanta, Egypt *

Titre original : Mineralogy and geochemistry of Gabal El-Ineigi Granite and associated fluorite veins, Central Eastern Desert, Egypt : application of fluid inclusions to fluorite genesis *

Source : Journal of African Earth Sciences, January 2001, vol. 32, no. 1, pp. 29-45(17) * Lien vers le résumé de l'article

Geology Department, Faculty of Science Tanta University, Tanta, Egypt * Titre original : Mineralogy and geochemistry of Gabal El-Ineigi Granite and associated fluorite veins, Central Eastern Desert, Egypt : application of fluid inclusions to fluorite genesis * Source : Journal of African Earth Sciences, January 2001, vol. 32, no. 1, pp. 29-45(17) * Lien vers le résumé de l'article

Granite magmas as sources of fluorine in fluorite deposits (Homrat Akarem, Egypt) Babansky A.D., Ryabchikov I.D., Solovova I.P. IGEM RAS, baban@igem.ru fichier pdf (en russe)

Titre du document / Document title Fluorine content in Egyptian basaltic rocks = La teneur en fluor des roches basaltiques de l'Egypte Auteur(s) / Author(s) ABDEL AAL A. A. Y. (1) ; ALY M. M. ; Affiliation(s) du ou des auteurs / Author(s) Affiliation(s) Minia univ., fac. sci., EGYPTE Source / Source Congrès Colloquium on african geology. 14 Colloquium on african geology. 14, Berlin (18/08/1987) 1987 , pp. 325-328 (11 ref.) Langue / Language Anglais Editeur / Publisher A. A. Balkema, Rotterdam; Boston MA, PAYS-BAS (1987) (Monographie) Mots-clés anglais / English Keywords Egypt ; Basalts ; Nephelinite ; Fluorine ; Phlogopite ; North Africa ; Volcanic rocks ; Igneous rocks ; Alkali gabbros ; Mots-clés français / French Keywords Egypte ; Basalte ; Néphélinite ; Fluor ; Phlogopite ; Afrique du Nord ; Roche volcanique ; Roche ignée ; Gabbro alcalin ; Mots-clés espagnols / Spanish Keywords Egipto ; Basalto ; Nefelinita ; Fluor ; Flogopita ; Africa del norte ; Roca volcánica ; Roca ignea ; Gabro alcalino ; http://cat.inist.fr

Homr Mikbid

Granite magmas as sources of fluorine in fluorite deposits
(Homrat Akarem, Egypt)
Babansky A.D., Ryabchikov I.D., Solovova I.P.
IGEM RAS, baban@igem.ru