检索结果-南通市图书馆

Hematization of Quartz Grains: Study of the Surface of Quartz Grains (M.E.B) and Semi-Quantitative Mineralization

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Geoscience and Environment Protection 2023年第11期11卷 82-90页

作者： Chia Marie Reine Kokoa Touvalé Marcel Kesse Fory Yao Paul Assale Sougo Aoua Coulibaly kouadio affian Unit of Formation and Research des Sciences de la Terre et des Ressources Minières Université Félix Houphou&#235t Boigny Abidjan C&#244te d’Ivoire Unit of Formation and Research des Mines Pétroles et Energies Institut National Polytechnique Houphou&#235t Boigny Yamoussokro C&#244te d’Ivoire Unit of Formation and Research des Sciences de la Terre et des Ressources Minières Université Peleforo Gon Coulibaly Korhogo C&#244te d’Ivoire

Interest in the Côte d’Ivoire sedimentary basin has led to numerous investigations. All these investigations are aimed at understanding the functioning of the basin and a paleogeographic approach including sediment transport dynamics. However, the use of exoscopy and semi-quantitative mineralogy has been little developed. This study was carried out to compensate for this lack of interest in these methods. Its aim is to understand the transformation of quartz into hematite using exoscopy and semi-quantitative mineralogy in the Adiaké locality, in the eastern onshore basin of Côte d’Ivoire. Two methods were applied to 250 μm-diameter quartz grains from the 40 m coasts. Exoscopy provides information on microscopic texture, surface and corrosion, as well as determining the transport mechanism and deposition phases of quartz grains. Semi-quantitative mineralogy provides an estimate of the weight percentages of major element oxides and the ultrastructure of quartz grains. Exoscopy showed that these grains had been subjected to torrential fluvial transport. They were marked by mechanical and chemical traces during this transport and evolved in different environments. Semi-quantitative mineralogy shows the existence of negative and positive correlations between oxides. Negative correlations indicate a substitution, in order of importance, of silicon by iron, phosphorus and aluminum in these quartz. Positive correlations show that there is no substitution between the oxides concerned in these quartz grains. Divo’s quartz grains have recorded several mechanical and chemical microstructures of their sedimentary episodes, with the appearance of iron nodules in the ports left by silica.

关键词： Quartz Exoscopy Semi-Quantitative Mineralogy Adiaké Ivory Coast

Evidence of the Albo-Cenomanian Unconformity Using Chemical Elements Case Study of Sediments from the Eastern Abidjan Margin

维普期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Open Journal of Geology 2023年第10期13卷 1054-1068页

作者： Chia Marie Reine Kokoa Samassy Rokyatou Lassey Lou Coulibaly Sougo Aoua affian kouadio Marc Ephrem Allialy UFR-STRM Félix Houphou&#235t-Boigny University of Abidjan Abidjan C&#244te d’Ivoire UFR-ARHAI San Pedro University of C&#244te d’Ivoire San Pedro C&#244te d’Ivoire

Sedimentological and chemostratigraphical studies using accessory elements on 322 samples of cuttings from oil wells located in the submerged sedimentary basin (offshore) of Côte d’Ivoire. This basin covered the chronostratigraphic interval from the Upper Albian to the top of the Maastrichtian. The aim of this study was to determine the major accident, the Albo-Cenomanian unconformity, using chemical elements. To achieve this goal, we had to count the accessory elements glauconite, pyrite and carbonaceous debris, and identify all the chemical elements present in each cuttings sample. The results clearly indicate that: the sediments are essentially composed of carbonaceous debris and pyrite, with a high potassium content for sediments dating from the Abian period;and glauconite, carbonaceous debris, pyrite, and a sharp decrease in potassium content for sediments dating from the Cenomanian to the Maastrichtian period. Threshold values for ratios of source-indicating chemical elements (Zr, Ti, Y, Th) and paleoenvironmental elements (K, Rb, Mg, Al,) highlighted the MS1 and MS2 mega-sequences in the study area. The difference observed in the threshold values of these ratios can be explained by changes in sedimentary dynamics. The depositional environment varies from an inner continental shelf with strong littoral influence (Upper Albian) to an increasing subsidence outer continental shelf (Cenomanian-K/Pg boundary).

关键词： Sedimentological Chemostratigraphical Margin Abidjan Côte d’Ivoire

Chemostratigraphic Characterization Tests on Sedimentary Formations in the Côte D’Ivoire Offshore Basin: Case of A-X and B-X Wells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Applied Sciences 2023年第10期13卷 1820-1833页

作者： Kokoa Chia Marie Reine Kra Akoua Clarisse Irié Bi Trazié Gaël Coulibaly Sougo Aoua affian kouadio UFR-STRM Félix Houphou&#235t-Boigny University of Abidjan Abidjan C&#244te d’Ivoire Departement of Geosciences Peloforo Gon Coulibaly University of Korhogo Korhogo C&#244te d’Ivoire

The tests performed with two hundred and thirty-nine (239) samples from the A-X and B-X drillings help to know their sedimentological and chemostratigraphic characters. In sedimentological term formations are composed of sand, sandstone, limestone, siltstone and argillite that alternate along the drill. In chemostratigraphic term two megasequences (MS1 and MS2) have been identified. A correlation of chemostratigraphic data completed by the lithology results allowed a subdivision of oil wells that shows two main types of deposits environments. First, a proximal marine environment to continental and to Albian marked by a detrital flow deducted from the concentrations evolution of indicator elements of terrigenous material that are K, Mg, and Rb. On the other hand, a deep to shallow marine environment of Cenomanian to Paleocene marked by the presence of predominantly clay sediments and abundant glauconite in the lower Senonian. Nevertheless, there is a transition or intermediate environment that is characterized by the presence of glauconite and detrital flows.

关键词： Chemostratigraphy Characterization Sediments Offshore Basin Albian-Paleocene Ivory Coast

Evolutive Trend of Water Level in the Ebrie Lagoon by Reconstitution of the Tide Gauge Time Series in Front of the Abidjan Coastline (Côte d’Ivoire)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Water Resource and Protection 2023年第10期15卷 526-538页

作者： Samassy Rokyatou Yéo Kokoa Chia Marie Reine Allialy Tano Anoumou Rene Mondé Sylvain Sangaré Seydou kouadio affian Laboratory of Geology Mining Resources and Energy Felix Houphouet Boigny University Abidjan C&ocircte d’Ivoire Laboratory of Fundamental and Applied Physic Nangui Abrogoua University Abidjan C&ocircte d’Ivoire Department of Hydrography Autonomous Port of Abidjan Abidjan C&ocircte d’Ivoire

The latest Intergovernmental Panel on Climate Change (IPCC) report shows that sea-level rise, which has been accelerated since the 19th century resulting to the global warming, threatens coastal areas with high population growth. A Global Sea Level Observing System (GLOSS) assessment highlighted the lack of data in Africa, and in Côte d’Ivoire in particular. In order to estimate the evolutionary trend of sea level along the Ivorian coast, and to draw up preventive plans to protect properties and populations, we digitized 65 years of historical tidegrams recorded in the Ebrie Lagoon, using the “Surfer” and “Nunieau” software, then processed them using “T-Tide” and “U-Tide” software. The average levels were calculated using the Demerliac filter from complete daily (day and night) recordings for providing a usable database of 31 years of hourly lagoon data from 1979 to 2015. Our results show that a mean water level in lagoon is 1.04 m. The evolutionary trend in sea level, estimated in the lagoon via the Vridi canal, during the rainy season is the most significant at 2.93 mm/year. This is followed by the dry season, with a trend of 2.89 mm/year. The flood season trend is 2.78 mm/year. This suggests that marine water inflows dominate continental inflows. Our results highlight the vulnerability of Côte d’Ivoire’s coasts to the risk of marine submersion.

关键词： Tide Mean Water Level Temporal Variability Vridi Channel Marine Submersion

Geochemistry of Cretaceous Sea Rocks from the LEO-3X Well in the Eastern Abidjan Margin, Côte d’Ivoire Offshore Basin

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Geology 2023年第10期13卷 1139-1150页

作者： Chia Marie Reine Kokoa Lassey Lou Soholy Ange Claverie Ahouré Nguessan Donald Allialy Marc Ephrem Coulibaly Sougo Aoua affian kouadio UFR/STRM Felix Houphouet-Boigny University of Abidjan Abidjan C&#244te d’Ivoire UFR/ARHAI San Pedro University of C&#244te d’Ivoire San Pedro C&#244te d’Ivoire Sciences and Techniques Alassane Ouattara University of Bouaké Bouaké C&#244te d’Ivoire

In this study, we apply geochemical and statistical analyses to evaluate the source rocks and kerogen type of Cretaceous sediments from the Cote d’Ivoire sedimentary basin. The geochemical analysis includes pyrolysis data such as total organic carbon (TOC%), generation source potential (S2) and hydrogen index (HI). The results of the cluster analysis separated the source rocks in the study area into two main groups. 1) Source rocks characterized by HI > 300 (mg/g), TOC from 1.76% to 3.19% by weight, and S2 from 6.55 to 14.46 (mg/g), indicating good to excellent source rocks with type II kerogen and are capable of generating oil. 2) Source rocks characterized by HI between 200 and 300 (mg/g), TOC from 1.6 to 2.02 wt%, and S2 from 3.45 to 5.36 (mg/g) indicating medium to good source rocks with type II-III kerogen and capable of generating a mixture of oil and gas.

关键词： Bedrock Kerogen Offshore Basin Cretaceous Côte d’Ivoire