Late- to post-collisional volcanism in the southern portion of the West African Craton (sWAC) has been described along the paleo-craton margin between the Paleoproterozoic Baoule-Mossi domain and Archean Kenema-Man nucleus. New lithostratigraphic and isotopic data for central Cote d'Ivoire, as well as revised regional stratigraphic correlations across the western sWAC, indicate that this volcanic resurgence is not only restricted to the paleo-craton margin, but extends to most greenstone belts of the western half of the sWAC. This late volcanic event, historically referred to as the ca. 2117–2080 Ma Bandamian Volcanic Cycle, has received little attention since its identification in 1996. Detailed geological investigation of the Bouafle granite-greenstone belt in Cote d'Ivoire, located 150 km east of paleo-craton margin, along with newly acquired U-Pb geochronological data indicate a peak in igneous activity showing evidence for bimodal magmatism affiliated to the Bandamian Volcanic Cycle in central Cote d'Ivoire between 2108 ± 5 Ma and 2105 ± 4 Ma. Whole-rock geochemistry and Lu-Hf isotopic measurements on magmatic zircons from the Bouafle region show that these Bandamian rocks are marked by a juvenile signature with little degree of crustal contamination. Collectively, the data collected in this study show that the Bandamian Volcanic Cycle represents an important thermal event that affected the sWAC during the late stages of the Eburnean orogeny, spanning the incremental change from folding and thrusting to dominantly transcurrent tectonics along major faults and shear zones. This paper discusses the possible geodynamic settings that may account for such a peak in thermal activity during the late stages of the Eburnean orogeny.

中文翻译：

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科特迪瓦中部班达米亚火山旋回的岩石地层演化：对埃本尼晚期岩浆再生及其地球动力学意义的洞察

西非克拉通 (sWAC) 南部的晚期至后碰撞火山作用已被描述为沿古元古代鲍勒-莫西域和太古宙凯内马-曼核之间的古克拉通边缘。科特迪瓦中部新的岩石地层学和同位素数据，以及整个西部 sWAC 修正的区域地层相关性表明，这种火山回潮不仅限于古克拉通边缘，而且延伸到西半部的大多数绿岩带的 sWAC。这个晚期火山事件，历史上称为约。2117-2080 Ma Bandamian 火山旋回，自 1996 年发现以来一直很少受到关注。 对位于古克拉通边缘以东 150 公里的科特迪瓦 Bouafle 花岗岩-绿岩带的详细地质调查，连同新获得的 U-Pb 地质年代学数据表明，火成岩活动的峰值显示了与科特迪瓦中部班达米亚火山循环相关的双峰岩浆活动的证据，在 2108 ± 5 Ma 和 2105 ± 4 Ma 之间。对来自 Bouafle 地区的岩浆锆石的全岩地球化学和 Lu-Hf 同位素测量表明，这些班达米亚岩石具有年轻的特征，几乎没有地壳污染。总的来说，本研究收集的数据表明，班达米安火山旋回代表了一个重要的热事件，它影响了埃本尼造山运动晚期阶段的 sWAC，跨越了从折叠和逆冲到沿主要断层和剪切带的主要横流构造的增量变化.