The Guixi basin, one of the most important manganese ore concentration areas in China, is characterized by multiphase mineralization across multiple stratigraphic units, predominantly as marine sedimentary manganese deposits. The basin comprises a succession of terrigenous clastic rocks deposited in coastal tidal flat- lagoon environments during the earliest Devonian, shallow marine carbonates from the late Early Devonian to the Early Triassic, and Middle Triassic bathyal- abyssal sandy and argillaceous flysch, accompanied by episodic submarine volcanism. This sedimentary succession records the multi- stage tectonic and paleogeographic evolution. The deposition of manganese carbonate ore beds was controlled by sedimentary paleogeographic conditions, primarily localizing in subtidal settings of coastal to shallow marine environments characterized by high hydrodynamic energy, relatively oxic conditions, and connectivity with open marine waters. Manganese mineralization concentrated in specific sedimentary facies transitional zones where high- energy subtidal environments graded into low- energy settings, exhibiting distinct episodic periodicity. The three main metallogenic episodes, the late Late Devonian, late Early Carboniferous, and early Early Triassic, correspond to key geological periods of marine regression in the Guixi basin. Although all manganese mineralization occurred within the same marine basin, the centers of ore accumulation did not spatially coincide. Instead, they migrated systematically in response to evolving paleogeographic patterns and shifting sediment supply regimes. Lithofacies associations and the spatiotemporal evolution of sedimentary facies are key factors controlling the formation and distribution of manganese carbonate ores. A siliceous- argillaceous- carbonate assemblage constitutes the typical lithofacies signature of the Guixi manganese deposits, with manganese ore bodies hosted predominantly in the upper section, often near the top, of a bimodal facies sequence characterized by lower chert and upper argillaceous- to- siliceous limestone.