Integrated Ocean Drilling Program

Expedition 311 Scientific Prospectus

Cascadia Margin Gas Hydrates

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Note: EXPEDITION 311 ADDENDUM (8 July 2005)

TABLE OF CONTENTS

• COVER PAGE
• PUBLISHER'S NOTES
• ABSTRACT
• SCHEDULE FOR EXPEDITION 311
• INTRODUCTION
  • Models for Formation of Widespread Gas Hydrate Layer
  • Coring Transect
  • Shortened Expedition Approach
• BACKGROUND
  • Geological Setting
  • ODP Leg 146 Results
  • Seismic Studies/Site Survey Data
• SCIENTIFIC OBJECTIVES
  • Geochemistry
  • Microbiology
  • Gas Hydrate Concentrations and Physical Properties
  • Gas Hydrates and Slope Stability
  • Cold Vents and Formation (Stability) of Near-Surface Massive Gas Hydrates
• DRILLING STRATEGY
  • Proposed Downhole Measurement Strategy
• LOGGING/DOWNHOLE MEASUREMENTS PLAN
  • Logging While Drilling
  • Wireline Logging
  • Vertical Seismic Profiling
• SAMPLING STRATEGY
  • General
  • Cruise-Specific Sampling Plan
  • Special Hydrate Sampling
• REFERENCES
• TABLES
  
  • Table T1. Expedition 311 operations.
• FIGURES
  
  • Figure F1. Location of drilling transect.
  • Figure F2. Marine gas hydrate cycle.
  • Figure F3. Continental slope off Vancouver Island.
  • Figure F4. Seismic Line 89-08.
  • Figure F5. Seismostratigraphy of Hole 889A.
  • Figure F6. Seismic signature of cold vents.
  • Figure F7. Seafloor bathymetry near Site CAS-01B.
  • Figure F8. Site survey at Site CAS-01B.
  • Figure F9. Site survey at Site CAS-02C.
  • Figure F10. Site survey at Sites CAS-03B and CAS-03C.
  • Figure F11. Site survey at Site CAS-04B.
  • Figure F12. Site survey at Site CAS-05B.
  • Figure F13. Site survey at Site CAS-05D.
  • Figure F14. Site survey at Site CAS-06A.
  • Figure F15. SCS site survey at Site CAS-06A.
  • Figure F16. Bottom video photographs.
  • Figure F17. Massive gas hydrate samples.
  • Figure F18. Detailed site survey at CAS-06A.
  • Figure F19. Site survey at Site CAS-06B.
  • Figure F20. Blank zone at Site CAS-06B.
• SITE SUMMARIES
  
  • Site CAS-01B
  • Site CAS-02C
  • Site CAS-03B
  • Site CAS-05D
  • Site CAS-06A
  • Site CAS-03C
  • Site CAS-04B
  • Site CAS-05B
  • Site CAS-06B
• SCIENTIFIC PARTICIPANTS (updated 27 September 2005)