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Explanatory notes to map of bauxite potential of Republic of Guineaкнига
- Авторы: Mamedov V.I., Makarova M.A., Chausov A.A.
- Год издания: 2022
- Место издания: Akvarel Moscow
- Объём: 102 страниц
- Тираж: 30 экз.
- Учебно-методическая литература
- Монография
- Аннотация: The identification of the Fouta Djallon – Mandingo territory as an independent bauxite province is substantiated. It is confinedto the morphostructure of the same name within a single geotectonic structure, the sedimentary cover of the Sahara Platform, in thetropical monsoon climate zone in West Africa. The bauxite exploration history, reserve and resource estimates, and production dynamicsin the Fouta Djallon– Mandingo province are reviewed. An updated cadastre of bauxite deposits, occurrences, and prospective areas ofthe Republic of Guinea has been compiled, with total resources of more than 46 Bt of ore extimated at Al2O3 cutoff grade of 40%, whichis almost half of the world’s resources of this raw material, including the results of recent drilling operations performed in Guinea byGEOPROSPECTS LTD.It is shown that protolith lithology is a factor of the bauxite spread and grade both on the regional areal scale and at local bauxiteoccurrences. More than 99% of the bauxite deposits and occurrences are confined to structural—lithologic complexes of the platformcover. Key factors of the grade of favorability of aluminosilicate protolith are the Al2O3/Fe2O3 ratio and the content and fineness ofquartz.Based on a new small-scale map of the geomorphic evolution cycles of West Africa we evaluated both regional (in particular, theidentification of Middle—Post-Miocene surfaces as the Major bauxite-bearing surface) and local geomorphic factors of the bauxitedistribution, characteristic, and grade. The conditions of topography dissection optimal for maximum preservation of bauxite arequantified. It is grounded by factual data that the epoch favorable for bauxite formation continued not only in the Neogene but also inthe Pleistocene and Holocene.Monitoring of ground water regimen and hydrochemical investigations, as well as special monitoring of the ground airin combination with detailed mineralogic, petrographic, and chemical studies of products of weathering, first allowed the reliableascertainment of spatial and genetic relation of the zonation of bauxite-bearing lateritic mantle to changes in ground ater and groundair regimens, as well as the metasomatic nature of weathering.Long stage-by-stage study of bauxites over a large area allowed, along with solving the main practical tasks (identification andcalculation of bauxite resources and reserves), to significantly advance in understanding the patterns of distribution and the role ofthe main factors of lateritic bauxite formation in this region, as well as to develop a genetic classification of bauxites and related rocks.The presented materials are the Map of Bauxite-bearing Potential of the Republic of Guinea, the Explanatory Notes to the Map ofBauxite-bearing Potential of the Republic of Guinea, and the Cadastre of Bauxite Deposits and Ocurrences of the Republic of Guinea.They are the scientific basis for the development of reasonable criteria for multi-scale forecasting and prospecting for bauxite depositsand, above all, high-quality bauxite deposits. This publication can also be useful as a manual for students, postgraduates, and youngscientists.
- Добавил в систему: Макарова Марина Александровна