Intrusion-related gold deposits: new observations from the Tighza polymetallic district, central Morocco
Gold enrichments are present in several styles of mineralization associated with granitic plutons, within a region previously recognized for other types of metal deposits. The newly recognized gold occurrences are located in the Hercynian belt of central Morocco, where the Tighrza district has long been known to contain W, Pb-Zn-Ag, and Sb-Ba deposits, which are intimately associated with calc-alkaline magmatism. The newly discovered gold mineralization in the district includes that hosted in quartz veins, andradite-vesuvianiteof disseminated pyrrhotite and arsenopyrite.Detailed structural analysis, geochemical and mineralogical associations, and fluid inclusion study show that the gold mineralization developed at the end of the magmatic activity. Gold deposition accompanied a major transition in magmatic fluid composition, and before the onset of a large convective hydrothermal cell around the intrusion that allows Pb-Zn mineralization to be deposited.
granite gold deposits zonation fluid structural geology Hercynian
K.Nerci E.Marcoux M.Jébrak A.Wadjinny H.Bounajma M.Nasloubi
ISTO, University of Orléans, Géosciences BP 6759, 45067 Orléans Cedex 2, France Université du Québec à Montréal, CP 8888, Succ.Centre Ville, H3C 3P8, Montréal (QUE) Canada CMT, 279 Boulevard Zerkhtouni, Casablanca, Maroc
国际会议
第八届国际矿床地质会议(Proceedings of the Eighth Biennial SGA Meeting)
北京
英文
88-90
2005-08-18（万方平台首次上网日期，不代表论文的发表时间）