The Mbondo-Ngazi Tina area belongs to the eastern part of the Adamawa-Yadé Domain (AYD), which corresponds to the central domain of the Central African Fold Belt (CAFB) in Cameroon. This area comprises three groups of granitoids including granites, syenites, and diorites, which are chemically similar to quartz monzonites and nepheline syenites, and monzodiorites, respectively. These granitoids are metaluminous and I-type rocks, with the dioritic rocks being ferroan and high-K calc-alkaline, while others are magnesian and shoshonitic rocks. The Ti-in-zircon thermometer suggests crystallization temperatures of 678–811 °C and 658–768 °C for monzonites and syenites, respectively. Their zircon trace element distribution and patterns coupled to the whole-rock geochemical features indicate that the Mbondo-Ngazi Tina granitoids were most likely originated from the mixture between crust- and mantle-derived melts, with high crustal portion for the quartz monzonites and nepheline syenites, and strong involvement of mantle component for the monzodiorites. The Ce/Ce*, Eu/Eu*, Th/U, and Zr/Hf of zircons suggest that the crystallization of magma melts took place under variable oxidizing and oxygen fugacity conditions at temperature of 678–768 °C. LA-ICP-MS U–Pb zircon analyses yield emplacement age of 576.4 ± 1.9 Ma and 585.9 ± 2.1 Ma for the quartz monzonites and nepheline syenites, respectively. These ages suggest that these rocks are post-tectonic granitoids emplaced during relaxation stages after the collision between the Amazonian-West African cratons and the São Francisco-Congo and Saharan cratons. The post-collisional extensional regime is related to the development of large shear zones across the Pan-African/Brasiliano belts, which played a role for the ascent and emplacement of post-tectonic granitoids in response to lithospheric delamination. This explains that such granitic plutons are widespread in the CAFB and adjacent Brasiliano belt.

Mbondo-Ngazi Tina 地区属于阿达马瓦-亚德域 (AYD) 的东部，对应于喀麦隆中非褶皱带 (CAFB) 的中央域。该区由花岗岩、正长岩和闪长岩三组花岗岩组成，其化学性质分别与石英二长岩和霞石正长岩和二长闪长岩相似。这些花岗岩为金属铝质和I型岩石，闪长岩为铁质和高钾钙碱性，其他为镁质和钾长石。Ti-in-zircon 温度计表明二长岩和正长岩的结晶温度分别为 678–811 °C 和 658–768 °C。他们的锆石微量元素分布和模式与全岩地球化学特征的结合表明，姆邦多-纳加齐蒂纳花岗岩最有可能起源于地壳和幔源熔体的混合物，石英二长岩和霞石正长岩的地壳部分较高，以及二长闪长岩的地幔成分的强烈参与。锆石的 Ce/Ce*、Eu/Eu*、Th/U 和 Zr/Hf 表明，岩浆熔体的结晶发生在 678-768 °C 的不同氧化和氧逸度条件下。LA-ICP-MS U-Pb 锆石分析得出石英二长岩和霞石正长岩的侵位年龄分别为 576.4 ± 1.9 Ma 和 585.9 ± 2.1 Ma。这些年龄表明，这些岩石是在亚马逊-西非克拉通与圣弗朗西斯科-刚果和撒哈拉克拉通碰撞后的松弛阶段形成的后构造花岗岩。碰撞后伸展状态与泛非/巴西带上大剪切带的发展有关，它对后构造花岗岩的上升和就位以响应岩石圈分层发挥了作用。这解释了这种花岗岩岩体在 CAFB 和邻近的 Brasiliano 带中广泛分布。为响应岩石圈分层而对后构造花岗岩的上升和就位起到了作用。这解释了这种花岗岩岩体在 CAFB 和邻近的 Brasiliano 带中广泛分布。为响应岩石圈分层而对后构造花岗岩的上升和就位起到了作用。这解释了这种花岗岩岩体在 CAFB 和邻近的 Brasiliano 带中广泛分布。