Figure 5. Chemical classification of pyroxenes in transitional basalts. (a) Position of pyroxenes in transitional basalt in the Q-J diagram of [22]; (b) Distribution of clinopyroxene of basalt in the Ti/(Ca + Na) diagram of [10]; (c) Mg-Ca-Fe²⁺+Fe³⁺+Mn diagram of pyroxenes [16]; (d) Position of clinopyroxenes in transitional basalts in the Al^IV vs. Al^IV diagram [23,24]. The domain limits are of [25]. RMC: fields of refractory mantle clinopyroxene [26]. HP=high pressure; LP=low pressure

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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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