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F1. Tectonic setting and regional seafloor geology of eastern Manus Basin.

F2. Bathymetric setting of Leg 193 drill sites.

F3. Distribution of lava groups in the PACMANUS vicinity.

F4. Distribution of hydrothermal deposit types.

F5. Zr/TiO₂ in altered volcanic rocks, Sites 1188 and 1189.

F6. Features of subseafloor hydrothermal alteration.

F7. Hydrothermal clay mineral assemblages.

F8. Acid sulfate alteration; pale selvage structure.

F9. Summary indicating anhydrite veins were emplaced after formation of pale selvages.

F10. Volume expansion during hydrothermal alteration, Sites 1188 and 1189.

F11. Strontium isotope ratios, Sites 1188 and 1189.

F12. "PACMANUS pressure cooker" model.

Tables T1-T3

T1. Petrologic classification of subseafloor alteration styles.

T2. Major elements in alteration categories at PACMANUS.

T3. Mass transfers during hydrothermal alteration.

Appendix Figures AF1-AF5

AF1. Zr/TiO₂ and anhydrous SiO₂.

AF2. Ratio of Si in altered volcanic samples to that in their precursors.

AF3. Ratio of Mg in altered volcanic samples to that in their precursors.

AF4. Ratio of K in altered volcanic samples to that in their precursors.

AF5. Ratios of Cu, Zn, and Pb in altered volcanic samples to those in their precursors.

Appendix Table AT1

AT1. Algorithms for estimating precursor compositions of altered rock.