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Assessment of Soils Developed on Various Formations in Maroua (Far North, Cameroon) for Production of Compressed Earth Bricks

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Open Journal of Applied Sciences 2023年第6期13卷 874-887页

作者： Bertin Pagna Kagonbé Bakary Souleymanou Viviane Djaoyang Bakaïné Raphael Essama Boum Belinga Bertrand Tatoh Aziwo alexis ngoniri hamdja Likiby Boubakar Local Materials Promotion Authority (MIPROMALO) Yaounde Cameroon National Institute of Cartography (INC) Yaounde Cameroon

One of the most important materials in the building industry is earth brick. The current work focuses on the evaluation of Maroua soils and their potential usage in the manufacturing of Compressed earth blocks (CEB). Four sites (Frolina, Goubeou, Mambang, and Djoulgouf) were chosen to conduct this study. One sample was collected at each location. Physico-chemical and mineralogical characteristics were obtained by using particle size, Atterberg limits, X-ray diffraction, and X-ray fluorescence analysis. Results revealed that sand is the most abundant fraction (36.9% - 50.5%) followed by clay (22.1% - 28.4%) and silt (11.3% - 23.8%). They mostly correspond to sandy soils. Liquid and Plastic limits range between 22.6% to 41% and 16.1% to 24.9% respectively and the plasticity index spans from 6.5% to 20.3%. Plasticity is low for Mambang and Djoulgouf and medium for Goubeou and Frolina soils. Mineralogical composition revealed the presence of smectite, kaolinite, and illite as clay minerals, associated with variable amounts of quartz, goethite, and K-feldspars. Geochemical analyses indicate a high silica content (47.1% - 72.8%) followed by alumina (10.9% - 22.8%) and iron (6.4% - 13.2%). The mineralogical, chemical and physical properties of the studied soils revealed that they are suitable for the manufacture of CEB according to the Cameroon Standards of CEB.

关键词： Soil Physical Properties Mineralogy Geochemistry CEB Maroua-Cameroon

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Zircon Trace Element Geochemistry and Ti-in-Zircon Thermometry of the Ngazi-Tina Pan-African Post-Collisional Granitoids, Adamawa Cameroon

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International Journal of Geosciences 2021年第4期12卷 307-328页

作者： alexis hamdja ngoniri Habib Dadjo Djomo Timoleon Ngnotue Patrick Ayonta Kenne Ghislain Ngassam Mbianya Sylvestre Ganno Jean Paul Nzenti Department of Earth Sciences University of Dschang Dschang Cameroon Institute for Geological and Mining Researches (IGMR) Yaounde Cameroon Department of Earth Sciences University of Yaoundé I Yaounde Cameroon

In Cameroon, the Ngazi-Tina region belongs to the Adamawa-Yade domain of the Pan-African Central African Fold Belt (CAFB). It is composed of two petrographic types: quartz-monzonites (majority) and nepheline syenites. Two morphological types, prismatic and pyramidal, were recognized in the zircon grains samples. These zircon types display internal structures typical of magmatic zircons. Zircons separated from the Ngazi-Tina samples contain higher abundances of Hf (close to 8000 ppm) and moderate trace elements (Y, Th, U, Nb, Ta) and REE contents, suggesting a variable degree of magmatic evolution. The chondrite-normalized REE patterns of zircons are characterized by LREE depletion relative to HREE with positive Ce and negative Eu anomalies, typical of magmatic zircons. The high Hf content together with high Ce/Ce*, Th/U, Zr/Hf ratios suggest magma crystallization under variable oxidation and oxygen fugacity. The application of Ti-in-zircon thermometer reveals crystallization temperatures ranging from 678°C to 811°C and 658°C to 768°C for quartz monzonites and nepheline syenites respectively. These features indicate probably a partial melting of continental crust as the source of these zircons grains and emplacement in the magmatic-arc setting.

关键词： Granitoids Zircon Geochemistry Ti-in-Zircon Thermometer Continental Crust Ngazi-Tina Adamawa-Yade Cameroun

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