Figure 9. Magmatic formations and associated risks to the west of Bamoun plateau. (a): Ignimbrites with a layered aspect; (b) huge rounded boulders suspended on the slopes of Njitet volcano in Bangourain; (c): feldsic lava dome in Nkan’yam; (d) and (e): volcanic product (ashes, lapilli and blocs) able to be mobilised on the flanks of hills in Nkoumelap. (f) basalt wall in Nkoumelap; (g) rhyolitic matrix of the lahar of Bangourain showing ignimbrite enclaves, basalts and rhyolites; (h) and (i): important extension of lahar of Bangourain respectively by flows in the surrounding valleys and revealed by areolar erosion; (j): “Bad lands” on the road linking the villages of Folap and Bangourain; (k) panoramic view grouping the villages directly exposed to the risks

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Transitional Basalts and Eruptive Dynamisms around Nkoumelap Locality (West of the Bamoun Plateau, Cameroon Volcanic Line): Petrography and Volcanic Risks’ Evaluation

Luc Achille ZIEM A BIDIAS, Amidou MOUNDI, Jonas Didero TAKODJOU WAMBO

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