The Suoluogou Gold Deposit, a large-scale gold deposit within the Garze-Litang suture zone, has limited research on its host tuff lava. This study focuses on petrography, geochemistry, and zircon U-Pb dating of the tuff lava to determine the rock formation age, reveal its petrogenesis and tectonic setting, and enhance understanding of themetallogenic conditions of the Suoluogou Gold Deposit. Zircon U-Pb dating yields a tuff lava crystallization age of 246.5 Ma + 1.6 Ma, indicating an Early Middle Triassic formation. Geochemical analyses show that the tuff lava is characterized by high Mg, Fe, and Ti contents, with w(La),/w(Yb), values of 10.71-17.75, 6Eu values of 0.88-0.97, and enrichment in large-ion lithophile elements (e.g., Rb, Th) and high-field-strength elements (e.g., Nb, Ta, Ce, Zr, Hf, Ti).These features suggest that the tuff lava belongs to an OIB-type alkaline mafic basalt series formed in a rift-related setting. The tuff lava originated from partial melting of garnet-and spinel-bearing Iherzolite, reflecting contributions from the lithospheric mantle. The petrogenesis can be attributed to upwelling of asthenospheric materials induced by mantle hot plumes or hotspots, which mixed with lithospheric mantle materials to some extent. The mixed lava under-went low-degree partial melting under lithospheric extension and decompression, without significant crustal contamina-tion during emplacement. During the closure of the Garze-Litang oceanic basin and subsequent continent arc colli-sion, dispersed gold was activated and migrated to form the gold-bearing tuff lava source layer. With later intracontinen-tal orogeny, driven by hydrothermal and thermal metamorphism, Au and Cu from both the initial deep-source layer and the tuff lava source layer were further activated, mobilized, enriched, or superimposed enriched, ultimately forming the Suoluogou Gold Deposit.