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Lu-Hf Isotopic Data of the Mbé-Sassa-Mbersi Tonalite (Central Cameroon Domain): Indicator of ca. 1.0 Ga Juvenile Tonian Magmatism in the Region

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Journal of Geoscience and Environment Protection 2021年第9期9卷 1-19页

作者： alliance nicaise saha-fouotsa Rigobert Tchameni Olivier Vanderhaeghe Armin Zeh Periclex Martial Fosso Tchunte Aurélien Eglinger Emmanuel Negue Nomo Pierre Barbey Department of Earth Sciences Faculty of Science University of Maroua Maroua Cameroon Department of Earth Sciences Faculty of Science University of Ngaoundéré Ngaoundéré Cameroon GET Université de Toulouse UPS CNRS IRD CNES Toulouse France KIT-Karlsruher Institut für Technologie Campus Süd Institut für Angewandte Geowissenschaften Abteilung Mineralogie und Petrologie Karlsruhe Germany Université de Lorraine CNRS GeoRessources Nancy France Department of Earth Sciences Faculty of Science University of Yaoundé I Yaoundé Cameroon Université de Lorraine CNRS CRPG Nancy France

关键词： Mbé-Sassa-Mbersi Central Cameroon Domain Central African Orogenic Belt Tonian magmatism Lu-Hf Isotopic Data

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Lu-Hf Isotopic Data of the Mbé-Sassa-Mbersi Tonalite (Central Cameroon Domain): Indicator of ca. 1.0 Ga Juvenile Tonian Magmatism in the Region

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Journal of Geoscience and Environment Protection 2021年第9期9卷 1-19页

The Pan-African/Brasiliano orogenic belts are a part of numerous Neoproterozoic orogenic belts that belong to the long-lived orgenic cycle that distancing phase started at the Tonian around 1.0 Ga. The Tonian magmatism fairly documented in the Neoproterozoic belts of Borborema Province (NE-Brazil), seemed so far inexistent in the Central African Orogenic Belt (CAOB) although these two belts were geologically correlated. Through the Lu-Hf geochronological analysis on zircon of tonalite, the present work, coupled with the previous data, suggests the existence of a Tonian age magmatism in the Central Cameroon Domain of the CAOB although the latter is much reworked. The Nguesseck tonalite outcrops in the northern part of the Mbé - Sassa-Mbersi region, in the northern edge of Central Cameroon Domain of the CAOB and in the Tcholliré - Banyo shear zone (TBSZ). The Lu-Hf data obtain on the zircon grains of this tonalite reveal juvenile Hf TDM age of ca. 1.0 Ga. This age, combined to the previous geochemical data suggest s that the protholites of this tonalite would have extracted from the source during the distancing phase (rifting and oceanization) of the Pan-african/Brasiliano orogeny at the early Neoproterozoic. References [ 1 ] Alvarenga, C. J. S., Moura C. A. V., Gorayed P. S. S., & Abreu F. A. M. (2000). Paraguay and Araguaia Belts. In U. G. Cordani et al. (Eds.), Tectonic Evolution of South America (pp. 183-193). International Union of Geological Sciences. [ 2 ] Barbey, P., Macaudière, J., & Nzenti, J. P. (1990). High-Pressure Dehydration Melting of Metapelites: Evidence from the Migmatites of Yaoundé (Cameroun). Journal of Petrology, 31, 401-427. https://***/10.1093/petrology/31.2.401 [ 3 ] Bayer, R., & Lesquer, A. (1978). Les anomalies gravimétiques de la bordure orientale du craton Ouest-africain: géométrie d'une suture panafricaine. Bulletin de la Société Géologique de France, 6, 868-876. https://***/10.2113/gssgfbull.S7-XX.6.863 [ 4 ] Beurlen, H., Silva

关键词： Mbé-Sassa-Mbersi Central Cameroon Domain Central African Orogenic Belt Tonian magmatism Lu-Hf Isotopic Data

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Petrography and Geochemistry of the Mbip Granitic Massif, SW Tcholliré(Central North Cameroon): Petrogenetic and Geodynamic Implication

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International Journal of Geosciences 2015年第7期6卷 761-775页

作者： Emmanuel Nomo Negue Rigobert Tchameni Olivier Vanderhaeghe Pierre Barbey Periclex Martial Fosso Tchunte Jonas Didero Takodjou Wambo Brice Yanick Lemdjou nicaise alliance saha fouotsa Department of Earth Sciences Faculty of Science University of Yaoundé Yaoundé Cameroon Department of Earth Sciences Faculty of Science University of Ngaoundéré Ngaoundéré Cameroon CNRS UMR7359 GeoResources Vandoeuvre-lès-Nancy Cedex France CNRS UMR7358 CRPG Vandoeuvre-lès-Nancy Cedex France Université de Lorraine Nancy France GET Université Paul Sabatier Toulouse France

In this article, we discussed about the petrography and geochemistry of magmatic rocks of the?Mbip massif?located SW of Tcholliré, in Central North Cameroon (Central African Fold Belt). Petrographic study shows that this massif is made of granodiorite, amphibole-biotite granite, and biotite granite which often contain enclave of mafic rocks (gabbro). Granodiorites and granites show porphyritic texture and consist dominantly of plagioclase and alkaline feldspar phenocrysts, quartz, biotite and often few amphibole. The gabbro enclaves are characterized by a granular porphyroid texture constituted of amphibole, plagioclase and olivine phenocrysts, all in a matrix of small crystals of plagioclase, olivine, amphibole, pyroxene and opaque minerals. All the analyzed rocks provide geochemical features of sublkaline serie and have nothing to do with the alkaline nature previously signaled in the former works. Granodiorites and granites are shoshonitic to calc-alkaline strongly potassic affinity consistent with emplacement in the continental collision setting. They present positive anomalies in Rb, Th, U;negative anomalies in Sr, P, Ti, Nb, Ta and some facies contain hydrated minerals such as amphibole. These characters are consistent with crustal and mantle contribution in their genesis. The mafic rocks (gabbro) have geochemical characteristics conferring a mantle origin, as confirmed by the high Mg# value (49.9). On the whole, the fractional crystallization of the magma formed by melting of crustal material and the magmatic mixing are the main petrogenetic process in the Mbip massif. Petrographic studies and geochemical data shows that the Mbip massif was emplaced in an active continental margin, into transitional regime from the end of maximum compression to the beginning of relaxation.

关键词： Central African Fold Belt Granitic Rocks Mafic Rocks Transitional Regime Active Margin.

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