Effects of Hotspot‐Induced Long‐Wavelength Mantle Melting Variations on Magmatic Segmentation at the Reykjanes Ridge: Insights From 3D Geodynamic Modeling

Spatial variations in mantle melting induced by the Iceland hotspot have strong effects on meso-scale upwelling and crustal production along slow-spreading Reykjanes Ridge. The ridge-hotspot interaction has been recorded diachronous V-shaped ridges troughs extending away from Iceland, as well changes ridge segmentation since 37 Ma. origins of structures are widely debated, while causes gradual erasion segments bounded transform faults rarely investigated. Through 3D time-dependent geodynamic modeling, this study investigates how hotspot-induced regional affect segmentation. Periodic temperature perturbations were initially imposed beneath zone to trigger buoyant cells, which corresponded offset at long-wavelength generated applying a linear gradient bottom model domain. Modeling reveals two-stage evolution cells that characterizes transition In Stage 1, along-axis pressure-driven flow, alters segment-scale promotes propagation segment boundaries region with relatively higher temperature. 2, destroyed progressively flow dominants, leaving between segmented unsegmented crust. These results advance our understanding heterogeneities ridges.