The 60 km-long Pan-African Bapé massif intruded in the Adamawa-Yade Archaean block is an excellent case for the study of subduction–collision-related magmatism, its origin by interaction among magmas from various sources, and its bearing on the evolution of the Pan-African orogenic belt in Cameroon. An integrated study including mapping, petrography and geochemistry was carried out on these Ba–Sr rich quartz monzonites, quartz monzodiorites, monzonites, granodiorites (adakites), syenites and micromonzogabbros. The rocks are dominated by plagioclase + alkali feldspars + amphibole + biotite + sphene + opaque minerals + apatite + zircon ± pyroxene ± quartz assemblage. They are I-type, ferroan, metaluminous and belong to high-K calc-alkaline, shoshonitic series. REE patterns form two sets of tight closed and of highly differentiated patterns. The spider diagrams display Th, U, Nb, Ta, Zr and Hf negative and Ba, K, Pb and Sr positive anomalies. High K₂O, Ba–Sr and moderate SiO₂ contents and the variation of canonical ratios such as Zr/Sm, Zr/Hf, La/Sm, and Sm/Yb, point to multiple origins for the Bapé granitoids such as (i) melting of a dehydrated subducting crust (adakites) and/or the metasomatized heterogeneous mantle wedge (spinel– and phlogopite–amphibole–garnet lherzolite), or (ii) the mixing of these liquids (other granitoids). The U–Pb emplacement age (640–603 Ma), coeval with the subduction–collision between the West-African and the Congo cratons, the occurrence of adakites, combined with geophysical data, support that these granitoids are link to the southeast–northwest subduction of the hot Yaoundé oceanic crust under the Adamawa-Yadé craton, during the Neoproterozoic time.

侵入阿达马瓦-亚德太古代地块的 60 公里长泛非 Bapé 地块是研究俯冲碰撞相关岩浆作用的绝佳案例，其起源于各种来源的岩浆之间的相互作用，以及它对演化的影响。喀麦隆泛非造山带。对这些富含 Ba-Sr 的石英二长岩、石英二长闪长岩、二长岩、花岗闪长岩（埃达克岩）、正长岩和微二长岩进行了包括绘图、岩石学和地球化学在内的综合研究。岩石以斜长石+碱长石+角闪石+黑云母+钆石+不透明矿物+磷灰石+锆石±辉石±石英组合为主。它们是I型、铁质、金属铝质，属于高钾钙碱性、钾长石系列。REE 模式形成两组紧密闭合和高度分化的模式。蜘蛛图显示 Th、U、Nb、Ta、Zr 和 Hf 负异常以及 Ba、K、Pb 和 Sr 正异常。高 K₂ O、Ba-Sr 和中等 SiO ₂含量以及 Zr/Sm、Zr/Hf、La/Sm 和 Sm/Yb 等正则比的变化指向 Bapé 花岗岩的多个起源，例如 (i) 熔融脱水俯冲地壳（埃达克岩）和/或交代异质地幔楔（尖晶石-和金云母-角闪石-石榴石菱镁矿），或（ii）这些液体（其他花岗岩）的混合。U-Pb 侵位时代（640-603 Ma），与西非和刚果克拉通的俯冲-碰撞同时期，埃达克岩的出现，结合地球物理数据，支持这些花岗岩与东南-西北联系在新元古代期间，热的雅温得洋壳在阿达马瓦-亚德克拉通下俯冲。