Document Details

Document Type : Article In Journal 
Document Title :
Mineralogy of copper deposits and ancient slags at the vicinity of Jabal
علم المعادن مقدّم النّحاس و الفجرة القديمة في قرب جبال ينحني سمران ميتافولكاناكس، المملكة العربيّة السّعوديّة المركزيّة الغربيّة
 
Subject : Mineralogy of copper deposits and ancient slags at the vicinity of Jabal 
Document Language : English 
Abstract : Secondary copper mineralizations at Jabal Samran area are located essentially in the form of a NE-trending shear zone characterized by hydrothermally altered metadacite formed in Precambrian arc setting. The disseminated sulphides in the metavolcanics host might also played an important role in the genesis of secondary copper mineralization that are confined to the shear zone. Hence, it is suggested that seawater and/or magmatic water were circulating and then emanated into the sea floor along deep-seated fractures forming an oxidizing hydrothermal cell rich in CO2. The movement of such hydrothermal fluids was responsible for dissolution of the Cu-bearing disseminated sulphides and the formation of contemporaneous extensive alteration zone in the underlying metadacites and to lesser extent in the metatuffs. It is believed here the formation of paratacamite by Cl-rich seawater oxidation of primary sulphides on the seafloor. It is believed that albitization and silicification of the host metavolcanics at Jabal Samran, mostly metadacite, promoted a type of acid neutralizing hydrolysis reactions at low pH leading to the formation of hydrous Cu-phases, chrysocolla and paratacamite. The mineralogical investigation of Samran copper slags revealed that the badly processed native copper prills still preserve relict chalcocite which is here considered as the main copper ore used by the ancients (the Abbasiyeen in particular) in addition to paratacamite, brochantite and other S-bearing phases (e.g. barite and jarosite). A mixture of copper ore minerals and two different types of fluxes (calcium carbonate and hematite) in order to lower the fluxing temperature of copper. Some of the collected slags still preserve relics of charcoal that acted as the source of energy. The copper slags of Jabal Samran area are air-cooled slags which are supported by the rope-like surface. 
ISSN : 1012-1319 
Journal Name : Science Journal 
Volume : 13 
Issue Number : 6 
Publishing Year : 1422 AH
2002 AD 
Article Type : Article 
Added Date : Monday, February 7, 2011 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
طلال القاضيQadi, Talal ResearcherDoctorate 

Files

File NameTypeDescription
 28896.pdf pdf 

Back To Researches Page