Zighmi K. Mineralogy of gold bearing complexes of the Tuareg Shield (Algeria).

For the first time the conclusion on polygene metamorphogenically hydrothermal nature of aurigenous mineralization and its belonging to gold-quartz ore formation has been made by studying metalliferous and nonmetalliferous associations of gold-bearing veins, their location, internal structure taking into account data on petrographic, petrochemical and genetic features of enclosing rock complexes of the Tuareg Shield. It was discovered that main regularities of gold mineralization bodies topomineralogy are conditioned by their location within zones of tectonic-metasomatic activization represented by mylonites and ultramilonites in metadacites, metande-sites, metaryolites and metaryodacites of andesite-ryolite formation of Riphean farusies series. Aurigenous bodies are represented by veins and partings , their nonmetalliferous paragenesi consist of quartz, carbonate, sericite, muskovite and chlorite, the metalliferous ones consist of two generations of pyrite, galenite, sphalerite and chalcopyrite.Quartz is represented by three generations that differ according to the temperature of mineral formation: quartz 1 - 285-260? C, quartz-2 - 220-200? C, quartz-3 - 150-100? C.The second generation quartz potentially contains gold. The formation of gold bearing vein minerals takes place according to the following scheme: quartz-1>pyrite-1>quartz-2>pyrite2>sphalerite>galenite>gold. The temperature pa-rameters of productive quartz formation as well as discovered metalliferous and nonmetalliferous mineral paragenesi of aurigenous bodies can be used as mineralogical search criteria.