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Lebrun, E., Miller, J., Thébaud, N., Ulrich, S. and McCuaig, T.C. (2016) Structural Controls on an Orogenic Gold System: The World-Class Siguiri Gold District, Siguiri Basin, Guinea, West Africa. Economic Geology, 112, 73-98.
https://doi.org/10.2113/econgeo.112.1.73

has been cited by the following article:

  • TITLE: Metasediments in the Alahina Sector and Associated Mineralization (North-Eastern Guinea)

    AUTHORS: Koffi Germain Tchokpon, Christophe Kaki, Glodji Luc Adissin, Soulémana Yessoufou, Mory Kourouma

    KEYWORDS: Metasediment, Schist, Sericite, Chlorite, Vein, Quartz, Gold, Alahina, Siguiri Basin

    JOURNAL NAME: Open Journal of Geology, Vol.9 No.12, November 19, 2019

    ABSTRACT: The Alahina sector is located in the North-East of Guinea, precisely in the Siguiri volcano-sedimentary basin. It consists mainly of meta-sediments traversed by Paleoproterozoic pyroclastite, granite, monzogranite and granodiorite veins as well as Mesozoic dolerite and gabbros veins. This article presents new data, on the one hand, on the geochemical petrographic features and the origin of the metasediments of this zone, and on the other hand, on the genetic model of the gold mineralization that they contain. Field observations, as well as petrographic and geochemical studies reveal that the meta-sediments consist of sericite and chlorite schists. They belong to the groups of shales and grauwackes. Their protholites are moderately altered (60 N/YbN = 6.31 - 13.24) and a flat heavy rare earth patterns (HREE). This spectrum is almost identical to those of the “Post-Archean average Australian Shale” and Early Proterozoic Greywackes. Two types of polyphase gold mineralization occur in the Alahina sector: disseminated and veined. They consist of particular of grains and nanoparticles pyrite associated with gold, magnetite, hematite, ilmenite. The hydrothermal alteration accompanying this mineralization consists of silica, microcline, chlorite-epidote-sericite-carbonates.