Abstract
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 Mbe-Sassa-Mbersi region, in the northern edge of Central Cameroon Domain of the CAOB and in the Tchollire-Banyo shear zone (TBSZ). The Lu-Hf data obtain on the zircon grains of this tonalite reveal juvenile HfTDM age of ca. 1.0 Ga. This age, combined to the previous geochemical data suggests 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.
Highlights
The central Cameroon Domain is the part of Central African Orogenic Belt which is correlated with the Pan-African/Brasiliano orogenic belts of the Borborema Province in NE-Brazil (Figure 1; Neves, 2003; Guimarães et al, 2012)
In spite of the similarity between the Borborema Province (NE-Brazil) and Central African Orogenic Belt (Van Schmus et al, 2008), the Tonian age rocks presented in the Cariris Velhos suite have not yet been described in the Cameroon part of Central African Orogenic Belt, though the biotite granite of the Ouaddaï (Chad) yield concordant inherited zircon cores crystallised around 1.05 Ga (Djerossem et al, 2020)
This paper presents Lu-Hf isotopic data on zircon from the Nguessek Tonalite near the Tcholliré-Banyo shear zone in the Mbé-Sassa-Mbersi region
Summary
The central Cameroon Domain is the part of Central African Orogenic Belt which is correlated with the Pan-African/Brasiliano orogenic belts of the Borborema Province in NE-Brazil (Figure 1; Neves, 2003; Guimarães et al, 2012). In spite of the similarity between the Borborema Province (NE-Brazil) and Central African Orogenic Belt (Van Schmus et al, 2008), the Tonian age rocks presented in the Cariris Velhos suite have not yet been described in the Cameroon part of Central African Orogenic Belt, though the biotite granite of the Ouaddaï (Chad) yield concordant inherited zircon cores crystallised around 1.05 Ga (Djerossem et al, 2020). These data provide additional information concerning the evolution of the early Neoproterozoic in the central Cameroonian domain of the Central Africa orogenic belt
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