Barite mineralisation in the south Um Monqul area, north Eastern Desert, Egypt

✍ Scribed by Mohamed A. Wetait; Nagy S. Botros

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 519 KB
• Volume: 25
• Category: Article
• ISSN: 1464-343X
• DOI: 10.1016/s0899-5362(97)00118-8

✦ Synopsis

The barite mineralisation in the north Eastern Desert of Egypt is hosted by Pan-African dacite, dacite porphyry and granite. The host rocks are variably altered by potassic, phyllic, phyllic-argillic, propylitic and advanced argillic alteration. The barite mineralisation is in veins trending east-northeast -west-southwest and dipping 65"-80° to the southeast. The veins are mainly of barite with subordinate quartz, accessory magnetite and specularite with minor sulphides (chalcopyrite, pyrite, covellite, enargite, bornite and pyrrhotite) and traces of Au. The barite mineralisation is associated with advanced argillic alteration, which resulted from interaction of the host rocks with acid sulphate fluids. It is envisaged that these fluids were released from high level intrusives similar to Cu bearing porphyry rocks. o 1997 Elsevier Science Limited. RBsume-La mineraiisation en baryte dans le Nord du Desert Oriental d'Egypte, est lice aux dacites, porphyres dacitiques et granites panafricains. Les roches encaissantes ont subi des alterations potassiques, phyllitiques, phyllitiques-pelitiques, propylitiques et une alteration pelitique prononcee. La mineralisation en baryte est presente dans des veines orientees ENE-WSW B pendage 65O-80° SE. Les veines sont composees essentiellement de baryte avec du quartz subordonne, de la magnetite et de la specularite accessoires avec de petites quantites de sulfides (chalcopyrite, pyrite, covellite, Bnargite, bornite, et pyrrhotite) et des traces d'Au. La mineralisation en baryte est associee B une alteration prononcee pelitique qui est le resultat de I'interaction entre les roches encaissantes et les fluides acides sulfates. Ile est envisage que les fluides Btaient provenant d'intrusions peu profondes comparables aux porphyres cupriferes. o 1997 Elsevier Science Limited.