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

被引：42
|
作者：
Njiosseu, ELT
Nzenti, JP
Njanko, T
Kapajika, B
Nédélec, A
机构：
[1] Univ Toulouse 3, LMTG, UMR 5563, F-31400 Toulouse, France
[2] Univ Dschang, Fac Sci, Dept Geol, Dschang, Cameroon
[3] Univ Yaounde, Fac Sci, Dept Sci Terre, Yaounde, Cameroon
来源：
COMPTES RENDUS GEOSCIENCE | 2005年 / 337卷 / 06期
关键词：
U-Pb zircon ages; Cameroon; Pan-African; Eburnean-Transamazonian; shoshonitic plutonism;
D O I：
10.1016/j.crte.205.02.005
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
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 U-Pb 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 Ebumean-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. (c) 2005 Academie des sciences. Published by Elsevier SAS. All rights reserved.
引用
收藏
页码：551 / 562
页数：12
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