New UPb zircon ages from Tonga (Cameroon): coexisting Eburnean–Transamazonian (2.1 Ga) and Pan-African (0.6 Ga) imprints

New UPb zircon ages from Tonga (Cameroon): coexisting Eburnean–Transamazonian (2.1 Ga) and Pan-African (0.6 Ga) imprints

The central domain of the Pan-African Belt in Cameroon is characterized by abundant porphyritic granitoids, which were emplaced synkinematically and variably orthogneissified in relation with ENE-striking steeply dipping transcurrent shear zones. These plutonic rocks have intermediate to felsic comp...

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Veröffentlicht in:Comptes rendus. Geoscience 2005-04, Vol.337 (6), p.551-562
Hauptverfasser: Tanko Njiosseu, Evine Laure, Nzenti, Jean-Paul, Njanko, Théophile, Kapajika, Badibanga, Nédélec, Anne
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container_issue 6
container_start_page 551
container_title Comptes rendus. Geoscience
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creator Tanko Njiosseu, Evine Laure
Nzenti, Jean-Paul
Njanko, Théophile
Kapajika, Badibanga
Nédélec, Anne
description The central domain of the Pan-African Belt in Cameroon is characterized by abundant porphyritic granitoids, which were emplaced synkinematically and variably orthogneissified in relation with ENE-striking steeply dipping transcurrent shear zones. These plutonic rocks have intermediate to felsic compositions and constitute a high-K calk-alkaline series. Conventional UPb zircon dating yields an age of 618 Ma for this syntectonic Pan-African magmatism in the Tonga area. The country rocks are made of metabasites (garnet amphibolites) and tonalitic to trondhjemitic gneisses, which suffered two distinct orogenic cycles: the first one is the Palaeoproterozoic Eburnean-Transamazonian cycle at 2.1 Ga and the second one is the Pan-African orogenesis. These new ages confirm the existence of an extensive Palaeoproterozoic crust in Cameroon and question the areal extent of the Congo-Sao Francisco craton towards the north.
doi_str_mv 10.1016/j.crte.2005.02.005
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title New UPb zircon ages from Tonga (Cameroon): coexisting Eburnean–Transamazonian (2.1 Ga) and Pan-African (0.6 Ga) imprints
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