Geochemical Characterizations of the Hypovolcanic Formations of the Pan-African Basement and the Cretaceous Sedimentary Basins of Figuil (North Cameroon) and Léré (South-West Chad): Petrogenetic and Geodynamic Implication of the Pan-African Range of Central Africa (CPAC) — Oak Academic Publishing
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Geochemical Characterizations of the Hypovolcanic Formations of the Pan-African Basement and the Cretaceous Sedimentary Basins of Figuil (North Cameroon) and Léré (South-West Chad): Petrogenetic and Geodynamic Implication of the Pan-African Range of Central Africa (CPAC)
Department of Mining and Geology Engineering, Faculty of Earth and Life Sciences, University of Pala, Pala, Chad
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Department of Geology, Faculty of Exact and Applied Sciences, University of N’Djamena, N’Djamena, Chad
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Department of Mining and Geology Engineering, Faculty of Earth and Life Sciences, University of Pala, Pala, Chad
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Department of Life and Earth Sciences, High University of Teacher Training, University of Maroua, Maroua, Cameroon
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Department of Mines, New and Renewable Energies, National Higher Institute of the Sahara and Sahel, Iriba, Chad
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Department of Earth and Universe Sciences, University of Doba, Doba, Chad
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Department of Life and Earth Sciences, High University of Teacher Training, University of Maroua, Maroua, Cameroon
1 Department of Mining and Geology Engineering, Faculty of Earth and Life Sciences, University of Pala, Pala, Chad
2 Department of Geology, Faculty of Exact and Applied Sciences, University of N’Djamena, N’Djamena, Chad
3 Department of Mining and Geology Engineering, Faculty of Earth and Life Sciences, University of Pala, Pala, Chad
4 Department of Life and Earth Sciences, High University of Teacher Training, University of Maroua, Maroua, Cameroon
5 Department of Mines, New and Renewable Energies, National Higher Institute of the Sahara and Sahel, Iriba, Chad
6 Department of Earth and Universe Sciences, University of Doba, Doba, Chad
7 Department of Life and Earth Sciences, High University of Teacher Training, University of Maroua, Maroua, Cameroon
The study area located between Figuil (Northern Cameroon) and Léré (Southwest Chad) belongs to the northern domain of the Pan-African Range of Central Africa (CPAC). The aim of this work is to highlight the petrogenesis of the hypovolcanic formations affecting the Pan-African base and the Cretaceous sedimentary basins of the study area as well as their geodynamic context. Hypovolcanic formations have a strong affinity with rocks of the continental tholeiitic series. The tholeiitic character with alkaline affinity constitutes the transition between alkaline and tholeiitic magmatisms. The low Rb/Sr ratios (0.24 - 1.24) constitute proof that the dolerites studied do not come from the partial fusion of Pan-African granitoids (Rb/Sr: 2.54 - 7.64) but rather from a mantle source as shown by the similar ratios of Zr/Hf (37.56 - 43.08), Nb/Ta (15.16 - 19.60) of dolerites from the Pan-African basement (DSP) and Zr/Hf (34.34 - 46.48), Nb/Ta (14.34 - 19.3) from dolerites from the Cretaceous sedimentary basins (DBSC). The enrichment in LREE relative to the HREE of the dolerites studied associated with the ratios (Tb/Yb) N (1.95 - 2.56), Dy/Yb (2.33 - 2.85) characterizes a mantle source of lherzolite with garnet.
KeywordsHypovolcanic FormationsGeochemistryContinental TholeiitePan-African BasementCretaceous Sedimentary Basin and Figuil-Léré
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