Fluid inclusions in the mesozonal gold deposit at Atud mine, Eastern Desert, Egypt

Gold mineralization at the Atud mine occurs as fracture-filling auriferous quartz veins hosted in Neoproterozoic dioritic rocks and along their contact with metagabbro. Gold mineralization is associated with metasomatic alteration zones around shear zones and quartz–carbonate vein arrays. The minera...

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Bibliographic Details
Published in:Journal of African earth sciences (1994) 2002-10, Vol.35 (3), p.347-363
Main Author: Harraz, Hassan Z
Format: Article
Language:English
Subjects:
Atud deposit
Fluid inclusions
Gold-Egypt
Microthermometry
Mineralogy of quartz veins
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Summary:Gold mineralization at the Atud mine occurs as fracture-filling auriferous quartz veins hosted in Neoproterozoic dioritic rocks and along their contact with metagabbro. Gold mineralization is associated with metasomatic alteration zones around shear zones and quartz–carbonate vein arrays. The mineralized veins consist of quartz, carbonate and albite gangue enclosing minor amounts of pyrrhotite, arsenopyrite, pyrite and sphalerite. Trace amounts of galena, chalcopyrite, magnetite and rutile are also present. Paragenetically, the mineralization is divided, with decreasing temperature, into three stages, namely: (1) Early (Au-poor, pyrrhotite–arsenopyrite–pyrite–quartz vein); (2) Main (Au-rich, sphalerite–arsenopyrite–pyrite–galena ± chalcopyrite–quartz vein); and (3) Late (quartz–carbonate–pyrite ± galena). Gold (15.6–36.2 at.% Ag) is present mainly as discrete grains of native gold (
ISSN:1464-343X
1879-1956
DOI:10.1016/S0899-5362(02)00152-5