Figures F1-F43
Tables
T1-T2
F1. Major active hydrothermal sites at convergent margins of the western Pacific Ocean.
F2. Regional tectonic setting of the PACMANUS hydrothermal field drilled.
F3. Tectonic model for the Manus Basin.
F4. Bathymetry of the Eastern Manus Basin from multibeam data.
F5. High-resolution single-channel seismic profile of the section across Pual Ridge at the position of the PACMANUS hydrothermal field and interpretation.
F6. Seafloor geology of the Eastern Manus Basin.
F7. Distribution of hydrothermal deposits within the PACMANUS field.
F8. Location of ODP holes at Site 1188 and VIT survey track.
F9. Key to lithology symbols used in the graphic summary log.
F10. Graphic summary log for Holes 1188A and 1188F showing the lithologic characteristics of the various units including alteration.
F11. Fresh, black, moderately vesicular rhyodacite.
F12. Fresh plagioclase phenocryst set in groundmass.
F13. Many amygdules in altered dacite are filled by mosaic quartz ± pyrite ± anhydrite.
F14. Perlitic texture of aphyric dacite that indicates the groundmass originally consisted of volcanic glass.
F15. Photograph and sketch of flow banding that is folded and crosscut by silica-anhydrite-pyrite veins.
F16. Summary of lithostratigraphic units, alteration style, and distribution of alteration phases, Site 1188.
F17. Pervasively bleached vesicular volcanic rock with a zoned alteration pattern toward a darker gray, less strongly bleached kernel.
F18. Green silica-clay altered rock with a remnant perlitic texture and anhydrite-(silica-pyrite) stockwork veining.
F19. Plagioclase phenocryst completely replaced by fine-grained illite and possible halloysite.
F20. Anhydrite-pyrite veining with well-developed siliceous halo hosted in green silica-clay altered volcanic rock.
F21. Chalcopyrite (yellow) partially enclosing and replacing pyrite.
F22. Pyrrhotite inclusion with smaller magnetite inclusions in pyrite.
F23. Anhydrite-pyrite vein with pyrite surrounding anhydrite.
F24. Photograph and sketch of complex vein relationships.
F25. Hole locations for Sites 1189 and 1190.
F26. Graphic summary log for Holes 1189A and 1189B showing the lithologic characteristics of the various units including alteration.
F27. Rounded plagioclase phenocrysts in altered volcanic rock.
F28. Moderately vesicular aphyric volcanic rock.
F29. Summary of lithostratigraphic units, alteration style, and distribution of major and minor to trace alteration phases for Holes 1189A and 1189B.
F30. Gypsum partly replacing anhydrite, which has partially replaced altered volcanic clasts.
F31. Jasperoidal quartz showing strong red internal reflections.
F32. Coherent flow-banded core piece, with a pseudobreccia appearance created by silica-clay alteration halos around a feeble network of silica veins.
F33. Semimassive sulfide and volcanic clasts.
F34. Sphalerite or magnetite precipitated on early pyrite and overgrown by later pyrite.
F35. Network of quartz-pyrite veins.
F36. Breccia with highly altered volcanic fragments in a matrix of quartz with minor pyrite.
F37. Comparison between RAB and FMS images in Hole 1189C.
F38. Fresh to slightly altered dacite.
F39. Glomerophyric cluster of phenocrysts and a nearby microvesicle.
F40. Fresh to slightly altered aphyric rhyodacite.
F41. Altered rhyodacite with a spotty appearance and a strongly elongated tabular vesicle lined with fine zeolite crystals.
F42. Cristobalite-clay alteration of pale brown volcanic glass in a moderately altered volcanic rock.
F43. Framboids of pyrite in a vein dominated by marcasite.
T1. Chronologic operations summary.
T2. Coring summary.
