The Permian- Triassic igneous rocks exposed along the southern margin of the Nanpanjiang basin provide an important record of Late Paleozoic- Early Mesozoic regional tectonic evolution. As southwestern Guangxi is a key manganese and bauxite resource region in China, the genetic link between magmatism and mineralization has attracted increasing research attention. This study summarizes the rock assemblages, geochemical and isotopic signatures of these igneous rocks, and discusses their sources, petrogenesis, and relationship with manganese and bauxite metallogenesis. The magmatism occurred in three phases: Late Permian (~260 Ma), Early- Middle Triassic (250~241 Ma) and Late Triassic (~215 Ma). Among these, the Late Permian and Late Triassic are dominanted by the basic intrusive rocks and basalts, whereas the Early- Middle Triassic consists of intermediate- basic and acidic volcanic rocks with minor diorite. The Late Permian basic rocks are divided into high- Ti and low- Ti groups, with the high- Ti group (＞2. 5%) being dominant. The high- Ti group belongs to the alkaline series, enriched in light rare earth elements (LREEs), large ion lithophile elements (LILEs) and high field strength elements (HFSEs). They have low (87Sr/86Sr)i values (0. 7053~0. 7054) and εNd(t) values close to 0 (1. 5~+1. 8), similar to OIB, and are derived from the partial melting of asthenospheric mantle. The low- Ti group belongs to the tholeiitic series, enriched in LILEs, with negative Nb- Ta anomalies and εHf(t) values less than 0, originating from the partial melting of ancient lithospheric mantle. The Early- Middle Triassic intermediate- basic volcanic rocks have SiO2 contents ranging from 53% to 60%, with high MgO (＞5%), Cr and Ni, which are similar to the geochemical characteristics of high- Mg andesite/diorite. They are enriched in LILEs, with high Y, low Sr/Y and (La/Yb)N ratios, relatively large variations in (87Sr/86Sr)i values (0. 7065~0. 7119), and relatively uniform Nd- Hf isotopic compositions (εNd(t)=8. 8~6. 5 and εHf(t)=5. 3~2. 4). They are derived from the partial melting of lithospheric mantle metasomatized by subducted slab sediment melts (and fluids). The Early- Middle Triassic acidic volcanic rocks belong to peraluminous high- K calc- alkaline rocks, with high SiO2 content, low MgO and MnO contents, significant negative Nb- Ta anomalies, high (87Sr/86Sr)i ratios and low εNd(t) values (11. 5~9. 1), showing the characteristics of island arc volcanic rocks. The Late Triassic low- Ti basic intrusive rocks generally have low TiO2 content (＜1. 5%), belonging to the tholeiitic basalt series. They are enriched in LILEs, with obvious negative Nb- Ta anomalies, and a large range of variations in (87Sr/86Sr)i values (0. 7068~0. 7090) and εNd(t) values (1. 7~8. 5). They are formed by the interaction between the partial melting of enriched lithospheric mantle and asthenospheric mantle melts. Overall, Late Permian and Early- Middle Triassic magmatism coincides with bauxite and manganese metallogenesis, respectively. The Late Permian low- Ti basic rocks and Early- Middle Triassic volcanic rocks likely supplied key material for metallogenesis.