On the basis of published data, interpretations for the sources, deposition ages, and timing of Eburnean and Pan-African orogeneses in the Nyong Complex (NC) and the Yaoundé Group (YG) are questioned. We argue that the supracrustal rocks in the NC and YD derived from various Meso- to Paleoproterozoic and Archean to Neoproterozoic sources, respectively. The minimum time interval for sediment deposition in the NC is ca. 2500–2005 Ma, compared to ca. 900–580 Ma in the YG. Apart from 2092 ± 1 Ma and ca. 1800 Ma overprinting events recorded in the NC only, tectono-metamorphic/magmatic events dated at ca. 900 Ma, ca. 700 Ma, ca. 650 Ma, ca. 600 Ma, and ca. 550–500 Ma have affected both the NC and the YG. It follows that Pan-African orogeny was a long-lasting event of more than 300 Ma.
All Science Journal Classification (ASJC) codes
- Geochemistry and Petrology