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Physico-Chemical and Petrographic Characterization of Carbonated Rocks of mintom (South-Cameroon) and Their Potential Uses

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International Journal of Geosciences 2016年第5期7卷 775-783页

作者： Zo’o Zame Philémon Mpakam Hernanie Grelle Samba Assomo Philippe Department of Earth Sciences Faculty of Sciences University of Yaoundé I Yaoundé Cameroon The Higher Institute of the Sahel University of Maroua Maroua Cameroon

The characterization of carbonated rocks of mintom allowed identifying three features (massive limestone, banded limestone and dolomite). Samples taken in these features were subjected to the physico-chemical analyses and to the mechanical tests. The results obtained show a convergence in the mineralogical composition in particular in the calcareous features (smectite, micas and calcite);the dolomite feature being mainly constituted by dolomite associated with the smectite. The chemical composition allows finding contents raised in CaO, in all the samples. However, in the dolomite and the banded limestone, the concentrations in MgO and in SiO2 are also important. The mechanical properties showed a good compression resistance for the massive limestone and the dolomite, the mechanical behavior of the banded limestone being low. The exploitation of these results allows recommending carbonated rocks of mintom in the production of the clinker, agricultural amendments and in the constructions of the civil engineering.

关键词： mintom Carbonated Rocks Characterization Physico-Chemical Petrographic

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Gold Behavior in Weathering Products of Quartz Vein in mintom Area South Cameroon(Central Africa)

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International Journal of Geosciences 2013年第10期4卷 1401-1410页

作者： Aurelien Manfred Mbenoun Gilbert Francois Ngon Ngon Elie Constantin Bayiga Rose Yongue Fouateu Paul Bilong Department of Earth Science Faculty of SciencesUniversity of DoualaDoualaCameroon Department of Earth Science Faculty of SciencesUniversity of YaoundeYaoundeCameroon

Gold mineralization in mintom area, south Cameroon was studied in a tropical forest setting using X-ray diffraction, inductively coupled plasma-atomic emission spectrometry (ICP/AES) and inductively coupled plasma-mass spectrometry (ICP/MS) respectively for the mineralogical and chemical data. The mineralization occurs in quartz veins in the archean Ntem complex of the vast Congo Craton in Central Africa. Gold distribution patterns were vertically studied in the different horizons of the weathering profile and in the different grain-size fractions of the materials sampled in the pit on down slope of the interfluve where the mineralization exists. The weathering profile consists of an upper, thin loose sandy-clayey horizon (P6) covered by a light humic horizon, a nodular horizon with lateritic nodules or blocks (P5), a gravel horizon (P4), a thin spotted horizon (P3) and a saprolite (P2) up to 1.4 m thick. The specific geochemical signature of the bedrock is not recognized in each horizon of the weathering profile. Some groups of elements, e.g., high SiO2 and low REE characterize quartz vein while Cr-Ni characterizes a basic rock like gabbro. The residual gold is concentrated at the base of weathering profile. Its concentration increases from the saprolite up to the gravel horizon and decreases in the surface horizons. However, the evolution of visible Au distribution is not the same for all grain-size fractions: 1) in the finest fraction, the Au content is only regular in spotted and gravel horizons;2) in the medium size fractions, the Au is in high content and greatly decreases from saprolite up to the spotted horizon and disappears in the upper horizons;3) in the coarsest fraction, Au content is found in the saprolite and the maximum Au content of the weathering profile is found in this layer just above the mineralized quartz vein. This observation shows that the mintom residual gold comes from the quartz vein.

关键词： Geochemical Gold Laterites mintom Quartz Veins Weathering

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