TRIDENT Mini Case Card — Deep Interior Volatile Partitioning: Hydrogen in Earth's Core (GEO-CORE-H-RES-001.v1)

This technical note applies the TRIDENT-Z0 diagnostic framework to the claim that Earth's metallic core contains 0.07–0.36 wt% hydrogen, equivalent to ~9–45 present-day oceans expressed as water-mass. The claim is evaluated through four gates: Bulk Lock (G1), Boundary Flow (G2), Constraint Field (G3), and Coherence Dependency (G4). G1 and G2 pass on the basis of high-pressure experimental evidence and standard differentiation partitioning mechanisms. G3 passes as non-exclusive — hydrogen is a plausible contributor to the core's density deficit without displacing other light elements (Si, O, S, C). G4 is held open pending joint seismic density/velocity closure, cosmochemical D/H isotopic mass-balance, and…