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Geochemical characterization of the metasedimentary rocks of the Yaounde Group within the southernmost North Equatorial tectonic belt:insights into geodynamic evolution

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Acta Geochimica 2023年第6期42卷 1017-1034页

作者： Simon Pierre Mbola Ndzana moise Christian Balla Ateba Germain Marie Monespérance Mboudou Moussa Nsangou Ngapna Jean Paul Sep Nlongang Solange Ipan moise bessong Jean Bosco Olinga Joseph Mvondo Ondoa Sébastien Owona Paul Bilong Department of Earth Sciences Faculty of ScienceUniversity of YaoundéIP.O.Box:812Yaounde´Cameroon Institute for Geological and Mining Research P.O.Box:4110NlongkakYaounde´Cameroon Department of Earth Sciences Faculty of ScienceUniversity of DoualaP.O.Box:24157DoualaCameroon Department of Geology Faculty of ScienceThe University of BueaP.O.Box:67BueaCameroon

The Proterozoic metasedimentary rocks of the Yaounde Group on the northern edge of the Congo Shield in Central Africa were investigated to understand their provenance and depositional ***,geochemistry,and field evidence helped to subdivide the metasediments into paragneiss,mica schist,chlorite schist,and quartzite which were derived from greywacke,shale,quartz arenite,litharenite *** are immature with some mature samples,moderately weathered and reworked Neo-and Post-Archean *** earth element signatures(Chondrite Eu/Eu^(*)≤1),enrichment of light rare earth elements over the heavy ones,and the La/Sc ratio(>0.7)are compatible with those of the intermediate and felsic sources from the upper continental *** metasediments were deposited in the continental arc setting and have evolved during Proterozoic times according to the Wilson cycle to form the West Gondwana including NE Brazil.

关键词： West Gondwana North Equatorial orogenic belt Yaounde Group Neoproterozoic basin Geochemistry of metasedimentary rocks Geodynamic evolution

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Sedimentological Studies of Alluvium Deposits along Ngovayang-Bipindi of Lokoundje River,Southwestern Cameroon

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International Journal of Geosciences 2019年第1期10卷 119-139页

作者： Mioumnde Arthur Paterne Mboui Felicite Audrey Katia Kue Petou Rokis Malquaire Kabir Shola Ahmed bessong moise Liqiang Zhang Key Laboratory of Deep Oil and Gas(China University of Petroleum(East China)) QingdaoChina Lobaratory of Ore Processing Institute of Geological and Mining ResearchYaoundeCameroon School of Geosciences China University of PetroleumQingdaoChina Department of Biology Advanced Teacher Training CollegeUniversity of Yaounde IYaoundeCameroon National Institute of Cartography YaoundeCameroon Postgraduate School of Sciences Technologies&GeosciencesUniversity of Yaounde IYaoundeCameroon

In an area of about 305 km2, Seventeen stream sediment samples were taken from alluvium on the banks and floodplain of the Lokoundjé River and its tributaries. Sand samples after being dried in an oven, are subjected to sedimentological analyses in laboratory. Amongst the analysis carried out;the particle size analysis helped to establish a precise textural description of the sediment and to understand the active mechanisms which occur during transport and particle deposition. The morphoscopy of quartz grains consists in determining the mode and duration of transport of the grains, thus allowing reconstructing the geological history of the latter. Heavy minerals are suitable to know the nature of the rock in which they come from and equal to specify their distributing province. The morphometry of pebble makes contributes for a better understanding to apprehension of the agents responsible for the transport of these materials. It appears that the alluvium of the Lokoundjé and its Bipindi tributaries are very fine to coarse. They are well segregated, classified, and homometric. It is the result of the actions of a hydrodynamic turbulent which is sometimes abrupt. From a morphoscopic point of view, using a binocular microscope, grains mainly belong to three categories based on their surface appearance: Grain unworn, the sub-dull and dull shiny. From the morphometric point of view, there is evidence of flattening and dissymmetry of pebbles which are slightly worn to form sub-spherical shapes. With regard to the study of heavy minerals, it has identified two mineralogical processions, which include a metamorphic process with the presence of Sillimanite and Andalusite. In addition, there is the presence of minerals such as green’s Hornblende, Tourmaline, and reflecting magmatic distribution. However, there are specific minerals such as zircon, which can be economically viable where the contents sometimes exceed 10 kg/m3. In the same vein, it has been noted the presence of

关键词： Sedimentology Alluvium Deposits Lokoundje River Ngovayang-Eseka

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Monitoring and Environmental Assessment of Seawater in West Central Africa: Case of the Kribi Industrial and Urban Port Complex in Cameroon, Guinea Gulf

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Journal of Geoscience and Environment Protection 2021年第6期9卷 167-183页

作者： Mioumnde Arthur Paterne Kusi Micheline Michelle-Alexia Ngum Kag Simon Pierre Kue Petou Rokis Malquaire Mumbfu Ernestine Mimba Botny-Capel Anne-Eunice Dissombo Edimo André Noel Masso Kody Christelle Zebaze Jiofack Kevine bessong moise Institute of Geological and Mining Research Yaoundé Cameroon Key Laboratory of Deep Oil and Gas (China University of Petroleum (East China)) Qingdao China Department of Earth Sciences University of Yaoundé I Yaoundé Cameroon National Institute of Cartography Yaoundé Cameroon Postgraduate School of Sciences Technologies & Geosciences University of Yaoundé I Yaoundé Cameroon Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Hohai University Nanjing China Department of Environmental and Natural Resources Protection Law Ocean University of China Qingdao China

This study is the first of a series of a project on the development and implementation of environmental protection policies, before, during and after the construction of the Kribi Industrial and Urban Port Complex (KIPC). The results will equip the State and scientific structures concerned with the protection of people, water resources and the environment as a whole. This includes reference data on the state of marine pollution in the region dating from the end of realization of the first phase of KIPC known as Kribi Deep-Water Harbor (KDWH). Accordingly, the aim of this work is to assess the current state of KIPC and its surrounding by quantifying the preliminary parameters of suspended matter (SM);to analyze the physical and chemical parameters, chemical pollution indicators for anions and major cations and organic pollution indicators of four water samples taken from four different sites in the project area by filtration and weighing, pH meter, turbid meter, titration, colorimetry and titrimetric methods. The analysis of these samples and these parameters provides results

关键词： Kribi Industrial Port Complex Seawater Monitoring and Environmental Assessment

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