Electromagnetic Conductivity Anomalies at Molecular Bond-Angle Derived Node Array Coordinates: A Statistical Analysis of the Global EM Database

We report a depth-stratified anomaly in lithospheric electrical conductivity at 78 node coordinates derived via molecular bond-angle geometry (H₂O 104.5°, CH₄ 109.47°, C₆H₆ 120°). Using the GlobalEM-2015 database at 2°×2° spatial resolution, log₁₀ conductivity profiles at node locations were evaluated against latitude-matched controls using non-parametric Mann-Whitney U tests under both exploratory (N = 50 controls/node, n = 3,900) and high-density spatial separation masking regimes (N = 500 controls/node, n = 39,000 ≥10° longitudinal exclusion, 5° node exclusion radius ). While an initial exploratory analysis suggested upper-crustal resistivity (0.25–12 km; p < 10⁻⁵), high-density masked validation demonstrates that shallow crustal and Moho transition (~35 km) layers exhibit no statistically significant global divergence (ns). However, a robust conductive excess consistently emerges and strengthens at upper-mantle depths: 75 km (p = 3.50x10-5, ***) and 125 km (p = 3.28 x 10-5, ). Subfamily analysis indicates this lithospheric response is independently driven by both H2O (75 km p = 4.97 x 10-4 and 125 km p = 5.52 x 10-4 **) and CH4 (125 km p = 0.0425; 75 km ns) nodes, whereas C₆H₆ nodes yield no significant variation at any depth. An identical analysis applied to the Becker-Hagens icosahedral-dodecahedral control grid (n = 62) reveals no significant deviation from baseline across all depth intervals (N=50: U = 93,398-101,223.5; p = 0.472-0.828; N=500: U = 900,073-960,119; p = 0.659-0.699). Sensitivity comparison confirms that shallow crustal signatures dissipate as artifacts of sampling density, whereas the deep mantle conductivity excess represents a statistically invariant signature uniquely associated with the bond-angle coordinate formulation.