Mapping of the Sedimentary Facies of the Bottom of the Ouladine Lagoon in Grand-Bassam (Ivory Coast_West Africa)  

作　　者：Bi Kassia Francis Koffi Samassy Rokyatou Epouse Yeo Kouassi Kouamé Alfred Bi Kassia Francis Koffi;Samassy Rokyatou Epouse Yeo;Kouassi Kouamé Alfred(Laboratory of Environmental Sciences and Technologies, Department of Earth Sciences, Jean Lorougnon Guédé University, Daloa, Ivory Coast)

机构地区：[1]Laboratory of Environmental Sciences and Technologies, Department of Earth Sciences, Jean Lorougnon Guédé University, Daloa, Ivory Coast

出　　处：《Journal of Geoscience and Environment Protection》2022年第10期163-175,共13页地球科学和环境保护期刊（英文）

摘　　要：The Ouladine lagoon has an irregular bottom lined with different substrates. The lithological characteristics make it possible to observe sediments ranging from silts to sands and mixed sediments of variable color. These different fractions have varying proportions. The coarse fraction (>63 μm) has percentages ranging from 0 to 77% and the fine fraction ( μm) from 22.46 to 100% in the different sediments collected. The minority fraction of fine sands occupies the northern banks where the greatest depths of the section parallel to the coastal strip are observed. On the other hand, the sandy fractions occupy the southern shore up to the vicinity of the Azuretti mangrove island. This sandy fraction is also present on almost the entire section from the Comoé-Ebrié lagoon confluence to the closed mouth. The grain size characters of the sediments, such as the diagram of the classification coefficient So and the mean Mz, show well-classified sands. These sediments are deposited in a slightly agitated environment coming mainly from dunes and rivers. The sands of the estuarine complex were emplaced by saltation for most samples and by rotation.The Ouladine lagoon has an irregular bottom lined with different substrates. The lithological characteristics make it possible to observe sediments ranging from silts to sands and mixed sediments of variable color. These different fractions have varying proportions. The coarse fraction (>63 μm) has percentages ranging from 0 to 77% and the fine fraction ( μm) from 22.46 to 100% in the different sediments collected. The minority fraction of fine sands occupies the northern banks where the greatest depths of the section parallel to the coastal strip are observed. On the other hand, the sandy fractions occupy the southern shore up to the vicinity of the Azuretti mangrove island. This sandy fraction is also present on almost the entire section from the Comoé-Ebrié lagoon confluence to the closed mouth. The grain size characters of the sediments, such as the diagram of the classification coefficient So and the mean Mz, show well-classified sands. These sediments are deposited in a slightly agitated environment coming mainly from dunes and rivers. The sands of the estuarine complex were emplaced by saltation for most samples and by rotation.

关 键 词：Substrate LITHOLOGY SILTS Sediments Barrier Beach Mouth Granulometric ESTUARINE SALTATION 

分 类 号：P73[天文地球—海洋科学]