F1. Seamount locations.
F2. Drill hole locations.
F3. Pore fluid profiles.
F4. Br/Cl vs. 1/Cl in pore fluids.
F5. B/Cl, B, and 
11B profiles.
F6. 11B vs. 1/B in pore fluids.
F7. Cl, F, and S profiles.
T1. Pore fluid chemistry.
T2. Solids mineralogy and chemical composition.
Figures F1-F7
Tables T1-T2
