Les granitoı̈des de la couverture protérozoı̈que de la bordure nord du craton du Congo (Sud-Est du Cameroun et Sud-Ouest de la République centrafricaine), témoins d'une activité magmatique post-kibarienne à pré-panafricaine

Abstract

Granitoids of the Proterozoic cover of the Congo craton northern edge (South-East of Cameroon and SouthWest of the Central African Republic), witnesses of a post-Kibarian to pre-Pan-African magmatic activity. Granitoid bodies dated from the Late Mesoproterozoic intrude the Palaeoproterozoic cover of the northern edge of the Congo craton. They line up a north-south left-lateral shear zone related to the Late Kibaran tectonics. They originated from crustal melting, may be due to the thermal anomalies, that were responsible of the large basaltic production during the pre-Pan-African extension of the Central Africa rift system.

Diachronous evolution of volcano-sedimentary basins north of the Congo craton: Insights from U–Pb ion microprobe dating of zircons from the Poli, Lom and Yaoundé Groups (Cameroon)

“…Early Neoproterozoic (1000 Ma) dolerites have been reported in Gabon, Congo, southern Cameroon, and Central African Republic where they cross-cut ca. 1100 Ma granites (Vicat et al, 2001); at the western edge of the Congo craton in Gabon, the onset of the break-up of the Rodinia supercontinent was associated with sedimentation, volcanism and plutonism between 1000-910 Ma (Tack et al, 2001). The Cariris Velhos orogeny (1150-950 Ma) in the Borborema Province of northeast Brazil has produced an 800 km SW-NE belt that is supposed to extend into central Africa (Van Schmus et al, 1995;Brito Neves et al, 2000, 2002.…”

An overview of the geology and major ore deposits of Central Africa: Explanatory note for the 1:4,000,000 map “Geology and major ore deposits of Central Africa”

“…to Mesozoic Carnot basin (e.g. Yobé granite at 1160 ± 61 Ma,Vicat et al, 2001). • Dolerite dyke swarm, crosscutting Paleoproterozoic formations at the frontiers of CMR, COG and CAF.…”

Petrochemical Characterization of Two Distinct Types of Dolerites from Bafoussam Area, West Cameroon

“…In the Adamawa plateau (North Cameroon), Vicat et al [9] identified previous alkaline volcanism of dolerites of Cenozoic era along the CVL. The dolerite dykes of the Adamawa plateau have chemical composition of continental tholeiites.…”

“…In Cameroon, doleritic magmatism is poorly reported. The few data available are those on dolerite dykes observed in cratonic formations of southern Cameroon [8] and in Adamawa region, North Cameroon [9], and the recent work on basaltic dyke swarms from southern part of Cameroon Volcanic Line [10]. No scientific works have been carried out on the dolerite dykes intruded into Panafrican rocks in western Cameroon.…”