Abstract The timing of metamorphism in the Karagwe-Ankole Belt (KAB, Central Africa) has never been investigated in detail. Although its metamorphic history and geochronology would provide a unique and crucial contribution, these aspects have largely been overlooked in most published geodynamic reconstructions of this belt. In this study, well-constrained Lu-Hf garnet dates obtained on four samples (three metasiltstones, one schist) can be directly linked to pre- and post-deformational greenschist metamorphism and broadly constrain the timing of Neoproterozoic deformation in the Karagwe-Ankole Belt. Depending on the host rock composition, garnet porphyroblasts grew over intervals of 620 Ma).

中文翻译：

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卢旺达Kibuye-Gatumba地区Lu-Hf石榴石年代学重建的Karagwe-Ankole带西部区域新元古代变形前后变质作用

摘要 Karagwe-Ankole 带（KAB，中非）变质作用的时间从未被详细研究过。尽管它的变质历史和地质年代学将提供独特而重要的贡献，但在该带的大多数已发表的地球动力学重建中，这些方面在很大程度上被忽视了。在这项研究中，在四个样品（三个变质粉砂岩，一个片岩）上获得的受约束的 Lu-Hf 石榴石日期可以直接与变形前和变形后的绿片岩变质作用相关联，并广泛地限制了 Karagwe-Ankole 带新元古代变形的时间. 根据主岩成分的不同，石榴石卟啉细胞的生长间隔为 620 Ma）。