The discontinuities of a ridge, defined by the geophysical properties, often coincide with geochemical variations in lava, highlighting the relationship between ridge discontinuity and the underlying magmatic system. This study presents bathymetric, geophysical, and basaltic geochemical data from the Daxi-non transform discontinuity (NTD) and adjacent segments. The Daxi-NTD is a typical micro-NTD, with an offset less than 15 km. Within the NTD, a neo-volcanic ridge has emerged, with an active hydrothermal system suggesting an underlying magmatic system. The study examines mantle composition, melting degree, crystallization pressure, and melt extraction processes beneath Daxi-NTD. Comparative analysis reveals that basalts in the Daxi area undergo extensive differentiation, characterized by higher crystallization pressure and lower melting degree compared to the adjacent segments. We propose that Daxi-NTD hosts an independent magmatic system, where melt migrates vertically through the magmatic system rather than laterally from the adjacent segment center. This approach aids in understanding the magmatism along slow-spreading ridges and provides insights into the geodynamics and tectonic evolution of younger ridge systems.
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