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Lithostratigraphic and Geochemical Characterization of tobene Phosphate Deposits: A Case Study of tobene South 1

International Journal of Geosciences 2023年第2期14卷 251-269页

作者： Ndeye Khady Ndiaye Mouhamadoul Bachir Diouf Pan African University for Life and Earth Science Institute University of Ibadan Ibadan Nigeria Département de Géologie Faculté des Sciences et Techniques Université Cheikh Anta Diop Dakar Senegal

tobene is the third exploitation panel of the Taiba Phosphate deposits. It is divided into five sectors and its exploitation started in 2003 after the closure of the Ndomor and Keur Mor Fall panels. The Taiba phosphate deposit has been the object of several studies based on lithology, biostratigraphy, geochemistry, and petrography;however, few investigations on the variation in thickness of the phosphate layer within the Tobène sector have been conducted. This study seeks to analyze the lithostratigraphic and geochemical characteristics of the phosphate layer in the Tobène South1. Results from the lithostratigraphic study show from top to bottom the following succession: the sandy overburden, the sandstone formation, the Silico-feralitic formation, the variegated roof clays, the Taiba formation (homogeneous ore and heterogeneous ore), and the foliated attapulgite of the wall. Geochemical analysis reveals an unequal distribution of major oxides (P2O5, CaO, Fe2O3, Al2O3, and SiO2). The area is dominated by P2O5 concentrations between 20% and 32%, the K parameter (=CaO/P2O5) has an average of 1.36. The iron associated with aluminum (feral) is present in the southern part and on the contours of the sector;the dominant silica concentration is 20%. Correlations established between the major oxides show a strong relationship with p-values 0.05, nevertheless there is proportionality in the evolutions between the chemical variables CaO and P2O5, on the other hand, an opposite evolution between P2O5 and the two chemical parameters silica (SiO2) and feral.

关键词： tobene Taiba Keur Mor Fall Ndomor Sandy Recovery Silico-feralitic

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Mineralogical Characterisation of the Sedimentary Phosphate Deposit of tobene （Western Senegal）

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Journal of Shipping and Ocean Engineering 2016年第4期6卷 226-240页

作者： Moustapha Diagne Mamadou Fall Mouhamadou Bachir Diouf Ndeye Penda Dione El Hadji MansourSamb Department of Geology Faculty of Science and Technology Cheikh Anta Diop University Dakar - Senegal Chemical Industries of Senegal

The Tobrne panel is the third of the Ta＇fba phosphate deposit. This mineralogical study contributes to the improved knowledge of the various facies that comprise the phosphate series of Tobrne. Based on X-ray diffraction results, the Tobrne panel yielded minerals that are primarily divided into four groups： minerals of the original phosphate phase： apatite, fluorapatite; carbonate minerals： calcite and dolomite; clay minerals： palygorskite, smectite, kaolinite and illite; minerals of altered facies： alteration minerals （analcime, millisite, crandallite and wavellite） and ferruginous minerals （goethite and gibbsite）. This succession of mineralogical associations reflects a polyphase alteration leading to a vertical and lateral facies sequence. This alteration intensifies the phosphate series upward and laterally from West to East.

关键词： tobene Taiba phosphate mineralogy Western Senegal.

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