Geochemistry of H2‐ and CH4‐enriched hydrothermal fluids of Socorro Island, Revillagigedo Archipelago, Mexico. Evidence for serpentinization and abiogenic methane

Research on Socorro Island, part of the UNESCO-listed Revillagigedo Archipelago, reveals that hydrothermal fluids rich in hydrogen (H₂) and methane (CH₄) originate from serpentinization processes beneath the volcano. The study identifies isotopic signatures of light hydrocarbons (δ¹³C and δ²H) and their inverse trend, indicating abiogenic methane formation at high temperatures within a basaltic-ultramafic hydrothermal system. Geochemical analysis, including carbon and helium isotopic ratios, suggests these fluids share similarities with those from mid-ocean ridge vents. The findings highlight the complex interplay of volcanic activity, seawater interaction, and subsurface geochemical processes in shaping Socorro Island's unique hydrothermal environment.

TARAN, Y. A., VARLEY, N. R., INGUAGGIATO, S., & CIENFUEGOS, E. (2010). Geochemistry of H₂‐ and CH₄‐enriched hydrothermal fluids of Socorro Island, Revillagigedo Archipelago, Mexico. Evidence for serpentinization and abiogenic methane. Geofluids, 10(4), 542–555. Portico. https://doi.org/10.1111/j.1468-8123.2010.00314.x