Serpentine bodies, primarily formed through the hydration of mafic and ultramafic rocks, exhibit distinctive geophysical properties in the convergent margin of NW South America. This region features a complex subduction zone that includes a suture zone and a lithospheric tear, which control serpentinite outcrops’ distribution and depth geometry. By analyzing gravity and magnetic anomalies, geothermal data, VP/VS ratio tomography, and magnetotelluric and gas measurements, we investigated the subsurface connections of serpentinite bodies, particularly within the Romeral Suture Zone and the Eastern Cordillera of Colombia. The main findings indicate that serpentinite occurrences are associated with specific geophysical anomalies and seismicity patterns, illuminating their role in subduction dynamics. VP/VS ratio tomography and space-time variations of apparent resistivity reveal deeper serpentinite diapirism on both sides of the volcanic arc, likely linked to buoyant advection from the subducted plates, affecting magmatism and earthquake distribution. The Caldas Tear could respond to the subduction geometry and the distribution of serpentinites, suggesting an interaction between tectonic processes and serpentinization. These insights refine the understanding of subduction zone mechanics by highlighting those serpentinites, whereas valuable indicators of past serpentinization and hydrogen generation are not the primary hydrogen source. Instead, the ultramafic protoliths from which serpentinites form are more significant contributors. This distinction advances knowledge of geotectonic evolution and the potential for renewable energy resources in subduction environments.

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