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139 results on '"Nzenti, Jean Paul"'

5. Method of choosing soils as CEB or pavement layers based on geological and environmental information and mode of treatment

Author

Manefouet Kentsa Bertille Ilalie, Kamgang Kabeyene Beyala Véronique, Katte Yato Valentine, Wouatong Armand, Nzenti Jean Paul, Ndjigui Paul Désiré, and Elimbi Antoine

Subjects
Method of Choosing Soils, for treated/untreated CEBs/Pavement layers (CSCP method), Science
Abstract

During research on the geological, mineralogical, mechanical and geotechnical nature of thick layers of soils developed on the rocks of the lower zone of the southern slopes of Mount Bambouto (West Cameroon), a couple of observations were made. The mechanical behavior of soils as construction materials is linked to the nature of the parent rock and its environment of formation. Four different types of rock have been noted: trachybasalt, orthogneiss, anatexite, and biotite-hornblende granitoid. These rocks in a hot and humid mountain climate, exposed to the monsoon wind, have weathered to give soils with exploitable characteristics in compressed earth bricks (CEB) and pavement layers. This article proposes a method of choosing a soil for pavement layers and for the production of fired earth bricks / earth bricks treated or not with hydraulic binders, based on the nature of the bedrock and the climatic environment. Several formulation models have been defined. The performance, fairness, accuracy and adequacy of these models with real values were made by metric evaluation. So, it is: • Preliminary method for quickly and easily formulating masonry units in clay soil. • Preliminary method for quickly and easily formulating pavement layers in clay soil. • Simple and reliable method for choosing clay soils as construction materials from elementary geological information.

Published
2023
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23. Quartz-Rich Fault Rocks as Potential High Purity Quartz Source (I) in a Sequence of the Central Cameroon Shear Zone (Etam Shear Zone): Geology and Structure

Author

Sigue, Cyrille, Moundi, Amidou, Mbongue, Jean Lavenir Ndema, Vishiti, Akumbom, Kedia, Arnold Chi, Suh, Cheo Emmanuel, Nzenti, Jean Paul, Pisello, Anna Laura, Editorial Board Member, Hawkes, Dean, Editorial Board Member, Bougdah, Hocine, Editorial Board Member, Rosso, Federica, Editorial Board Member, Abdalla, Hassan, Editorial Board Member, Boemi, Sofia-Natalia, Editorial Board Member, Mohareb, Nabil, Editorial Board Member, Mesbah Elkaffas, Saleh, Editorial Board Member, Bozonnet, Emmanuel, Editorial Board Member, Pignatta, Gloria, Editorial Board Member, Mahgoub, Yasser, Editorial Board Member, De Bonis, Luciano, Editorial Board Member, Kostopoulou, Stella, Editorial Board Member, Pradhan, Biswajeet, Editorial Board Member, Abdul Mannan, Md., Editorial Board Member, Alalouch, Chaham, Editorial Board Member, O. Gawad, Iman, Editorial Board Member, Amer, Mourad, Series Editor, Rossetti, Federico, editor, Blanc, Ana Crespo, editor, Riguzzi, Federica, editor, Leroux, Estelle, editor, Pavlopoulos, Kosmas, editor, Bellier, Olivier, editor, and Kapsimalis, Vasilios, editor

Published
2019
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32. Mantle-crust-interaction and subduction dynamics in Central Cameroon: Evidence from the Pan-African Linté microgranular magmatic enclaves (MMEs) and host syenite

Author

Kenne, Patrick Ayonta, primary, Ganno, Sylvestre, additional, Ogunyele, Abimbola Chris, additional, Wambo, Jonas Didero Takodjou, additional, Ngnotué, Timoléon, additional, Fossi, Donald Hermann, additional, Wanang, Marion Merline Kwamou, additional, Woguia, Brice Kamguia, additional, and Nzenti, Jean Paul, additional

Published
2023
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40. Zircon trace element geochemistry and Ti‐in‐zircon thermometry of the Linté Pan‐African granitoids, Central Cameroon: Constraints on the genesis of host magma and tectonic implications

Author

Ayonta Kenne, Patrick, primary, Tanko Njiosseu, Evine Laure, additional, Ganno, Sylvestre, additional, Ngnotue, Timoleon, additional, Fossi, Donald Hermann, additional, Hamdja Ngoniri, Alexis, additional, Nga Essomba, Philomene, additional, and Nzenti, Jean Paul, additional

Published
2021
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45. Petrogenesis and tectonic setting of the Paleoproterozoic Kelle Bidjoka iron formations, Nyong group greenstone belts, southwestern Cameroon. Constraints from petrology, geochemistry, and LA-ICP-MS zircon U-Pb geochronology

Author

Nzepang Tankwa, Marvine, primary, Ganno, Sylvestre, additional, Okunlola, Olugbenga Akindeji, additional, Tanko Njiosseu, Evine Laure, additional, Soh Tamehe, Landry, additional, Kamguia Woguia, Brice, additional, Mbita, Arnold Steven Motto, additional, and Nzenti, Jean Paul, additional

Published
2020
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50. A mixed seawater and hydrothermal origin of superior-type banded iron formation (BIF)-hosted Kouambo iron deposit, Palaeoproterozoic Nyong series, Southwestern Cameroon: Constraints from petrography and geochemistry

Author

Ganno Sylvestre, Nzenti Jean Paul, Ngnotue Timoleon, Njiosseu Tanko Evine Laure, Djoukouo Soh Arlette, Kouankap Nono Gus Djibril, and Moudioh Cyriel

Subjects
geography, geography.geographical_feature_category, 010504 meteorology & atmospheric sciences, Greenschist, Terrigenous sediment, Geochemistry, Mineralogy, Geology, 010502 geochemistry & geophysics, Granulite, 01 natural sciences, Hydrothermal circulation, Petrography, Craton, Geochemistry and Petrology, Facies, Economic Geology, Banded iron formation, 0105 earth and related environmental sciences
Abstract

The Kouambo iron deposit contains banded iron formations (BIFs) and is located in the northwestern margin of the Congo craton. The BIFs are hosted in Palaeoproterozoic Nyong series, a dominantly metasedimentary formations, which were metamorphosed into greenschist to granulite facies. The Kouambo BIFs are medium- to coarse-grained banded rocks consisting of alternation of Si-rich and Fe-rich mesobands, and belong to oxide facies iron formations. Geochemistry analyses reveal that these iron formations are composed of > 96 wt% Fe2O3 and SiO2 and have low concentrations of Al2O3, TiO2 and trace HFSE, suggesting chemical precipitates of silica and iron. Moreover, these BIFs have low concentrations of Al2O3, TiO2 and trace HFSEs (high field strength elements, e.g., Zr, Hf, Ta, Pb and Th), suggesting that terrigenous detrital materials contributed insignificantly to the sedimentation. The Post-Archean Australian Shale (PAAS)-normalized REE-Y patterns display seawater-like profile: minor LREE depletion and HREE enrichment, positive Y anomalies. However, they display positive Eu and negative Ce anomalies, and low Y/Ho ratio (average 29), which suggest the influence of the hydrothermal fluids. The weak positive Eu/Eu*(PAAS) ratio (average 1.5), associated with the low V (17.5 ppm), Co (6.1 ppm) and Ni (27.5 ppm) contents similar to other Superior-type BIFs worldwide, are consistent with the deposition of the Kouambo BIFs in continental marginal sea or back-arc basin environment. In summary, the Kouambo BIFs show a seawater-like REE + Y signature, however, the positive Eu anomalies and reduced Y/Ho ratios relative to seawater indicates a possible mixing with hydrothermal fluids (∼ 0.5%).

Published
2017

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