Delivery of deep-sourced, volatile-rich plume material to the global ridge system

- H2O contents of MORB are highest in those interacting with near axis plumes.
- MORB with high H2O coincide with volcanic lineaments radiating from plumes.
- REE inversion models can be used to estimate primary melt volatile contents.
- Solid-state flow accounts for plume-influenced MORB with moderate H2O contents.
- Two-phase flow in melt-rich conduits delivers volatiles from plumes to ridges.