Petrological and Statistical Studies of the Limbiko Bauxite Deposit, Republic of Guinea  

作　　者：Abdoulaye Kadiatou Diallo Mohamed Samuel Moriah Conte Oumar Barou Kaba Aly Soumah Mohamed Camara Abdoulaye Kadiatou Diallo;Mohamed Samuel Moriah Conte;Oumar Barou Kaba;Aly Soumah;Mohamed Camara(Laboratory for Applied Research (LAR), Fundamental Geology and Prospection Research Unit (FGPRU), Emerging Centre for Mines and Society (ECMS) of the Institute Superior of Mines and Geology of Boke (ISMGB), Boké, Republic of Guinea;Laboratory for Applied Research (LAR), Research Unit Mining and Resource Development (RUMRD), Emerging Centre for Mines and Society (ECMS) of the Institute Superior of Mines and Geology of Boke (ISMGB), Boké, Republic of Guinea)

机构地区：[1]Laboratory for Applied Research (LAR), Fundamental Geology and Prospection Research Unit (FGPRU), Emerging Centre for Mines and Society (ECMS) of the Institute Superior of Mines and Geology of Boke (ISMGB), Boké, Republic of Guinea [2]Laboratory for Applied Research (LAR), Research Unit Mining and Resource Development (RUMRD), Emerging Centre for Mines and Society (ECMS) of the Institute Superior of Mines and Geology of Boke (ISMGB), Boké, Republic of Guinea

出　　处：《International Journal of Geosciences》2023年第4期351-376,共26页地球科学国际期刊（英文）

摘　　要：The increasing demand for Aluminium pushes the miners to multiply the research in order to answer this demand. The objective of this work is to characterize the bauxitic deposit of Limbiko. The methodology consists in collecting samples, and establishing stratigraphic logs, sections and geological maps. The analyses were carried out in the laboratory of the Company des Bauxites de Guinea. Statistical methods were used to process the geochemical data. The study area is characterized by sedimentary formations of the Devonian, in which the dolerites of the Mesozoic were injected. It is on these Devonian and Mesozoic formations that the Limbiko bauxite deposit was developed. The stratigraphic logs show the succession of formations. The parent rock is surmounted by an alteration crust. The petrographic study is based on the bauxitic and transitional zones characterized by ferruginous laterites. Both zones contain some ferriplantite. Mineralogical analysis shows the presence of gibbsite, goethite, alumogoethite, rutile and clay minerals. The geochemical study of the major elements shows that the more the contents of SiO₂, Fe₂O₃ decrease, the more the content of Al₂O₃ increases and those of TiO₂, Al₂O₃ increase in the same direction. The PCA confirms the mineralogical results by classifying the samples into clay, bauxite and ferrite.The increasing demand for Aluminium pushes the miners to multiply the research in order to answer this demand. The objective of this work is to characterize the bauxitic deposit of Limbiko. The methodology consists in collecting samples, and establishing stratigraphic logs, sections and geological maps. The analyses were carried out in the laboratory of the Company des Bauxites de Guinea. Statistical methods were used to process the geochemical data. The study area is characterized by sedimentary formations of the Devonian, in which the dolerites of the Mesozoic were injected. It is on these Devonian and Mesozoic formations that the Limbiko bauxite deposit was developed. The stratigraphic logs show the succession of formations. The parent rock is surmounted by an alteration crust. The petrographic study is based on the bauxitic and transitional zones characterized by ferruginous laterites. Both zones contain some ferriplantite. Mineralogical analysis shows the presence of gibbsite, goethite, alumogoethite, rutile and clay minerals. The geochemical study of the major elements shows that the more the contents of SiO₂, Fe₂O₃ decrease, the more the content of Al₂O₃ increases and those of TiO₂, Al₂O₃ increase in the same direction. The PCA confirms the mineralogical results by classifying the samples into clay, bauxite and ferrite.

关 键 词：BAUXITE Alteration Crust Aleuro-Argillite DOLERITE GIBBSITE 

分 类 号：P61[天文地球—矿床学]