The gabbroic intrusions are situated along the Cenxi-Wuzhou fault zone in Xindi-Anping area, southeastern Guangxi. Petrographic studies indicate that these rock bodies intruded into the Lower Paleozoic or Sinian strata, and were covered by Cretaceous. The gabbroic intrusions are mainly composed of amphibolite gabbro, hypersthene-amphibolite gabbro and minor plagioclase-bearing pyroxenite, gabbro-diorite and diabase (-porphyry). LA-MC-ICP-MS zircon U-Pb dating results yielded a weighted mean ²⁰⁶Pb/²³⁸U age of 249.1±2.8 Ma (MSWD=0.44) for the amphibolite gabbro, suggesting an emplacement of Early Triassic. Geochemical analysis shows that the gabbroic intrusions are characterized by relatively low MgO (2.13%~3.59%) values and relatively high Fe₂O₃^T (16.42%~33.53%), P₂O₅ (0.58%~1.18%) and TiO₂ (1.52%~2.31%) values, and that the intrusions are relatively enriched in large ion lithophile elements (LILE: Ba, Rb and U) and relatively depleted in high field strength elements (HFSE: Nb-Ta, Zr-Hf and Ti). Such signatures display geochemical characteristics of typical subduction-related arc volcanic rocks, which suggests that the gabbros were formed in an active continental margin (continental arc) setting. In combination with the regional tectonic evolution, the authors consider that there existed a Paleozoic paleo-ocean basin in the southwestern segment of joint belt between Yangtze and Cathaysia plates (so-called Qinzhou-Hangzhou joint belt), and the oceanic basin had not been closed until the Indosinian orogeny in middle Triassic. The continental arc gabbro in the region was an important record of this oceanic lithosphere subduction during the Paleozoic period.