Proc. IODP, 336, Design and deployment of borehole observatories and experiments during IODP Expedition 336, Mid-Atlantic Ridge flank at North Pond

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Chapter contents Abstract Background, motivation, and overview Subseafloor observatories North Pond setting, history of study, and initial characterization North Pond upper oceanic crust, borehole conditions, and CORK overview Expedition 336 CORKs: mechanical and hydraulic features overview CORK sealing and isolation elements CORK sampling components CORK component surface treatments Expedition 336 CORKs: detailed configuration CORK wellhead CORK stinger CORK stinger sampling and experimental umbilicals and screens Expedition 336 CORKs: sensors and sampling Pressure sensors Temperature sensors Oxygen Fluid sampling for geochemical analyses Microbial growth chambers Expedition 336 CORKs: detailed summaries for each CORK installed Hole 395A Hole U1382A Hole U1383B Hole U1383C Future plans ROV dives CORK-lite Acknowledgments References Figures F1. Location maps. F2. Borehole configuration at North Pond. F3. CORK wellheads at start of expedition. F4. Coatings and sealants. F5. Umbilicals, miniscreens, and centralizers. F6. CORK umbilical–flatpack. F7. CORK packer configurations. F8. L-CORK wellhead. F9. Fiberglass casing and packers. F10. Instrument bay. F11. VIT camera system. F12. CORK wellhead bays, Hole U1382A. F13. CORK wellhead bays, Hole U1383C. F14. CORK stinger typical components. F15. CORK miniscreens. F16. OsmoSampler packages. F17. Fast-flow wellhead OsmoSamplers. F18. FLOCS microbial colonization experiment. F19. Configuration of new Hole 395A CORK. F20. CORK wellhead damage, Hole 395A. F21. VIT footage of ROV platform, Hole 395A. F22. Configuration of Hole U1382A CORK. F23. Reentry cone and casing, Hole U1383B. F24. Configuration of Hole U1383C CORK. F25. CORK body to be installed, Hole U1383B. Tables T1. Coatings used on different materials. T2. Lubricants. T3. Umbilical materials. T4. CORK stinger tubular strength comparison. T5. CORK stinger tubular stretch. PDF file			Previous \| Next doi:10.2204/iodp.proc.336.109.2012 Design and deployment of borehole observatories and experiments during IODP Expedition 336, Mid-Atlantic Ridge flank at North Pond¹ K.J. Edwards,^2,³ C.G. Wheat,² B.N. Orcutt,² S. Hulme,² K. Becker,² H. Jannasch,⁴ A. Haddad,² T. Pettigrew,⁵ W. Rhinehart,⁶ K. Grigar,⁶ W. Bach,² W. Kirkwood,⁴ and A. Klaus² Abstract During Integrated Ocean Drilling Program (IODP) Expedition 336 to North Pond on the western flank of the Mid-Atlantic Ridge (8 Ma crust) in the late fall of 2011, borehole observatories were installed in IODP Holes U1382A and U1383C and Deep Sea Drilling Project Hole 395A. These borehole observatories are designed for long-term (multiyear) coordinated hydrogeological, geochemical, and microbiological monitoring and experimentation to understand the nature of life, fluid flow, and fluid-rock interactions in young and cool oceanic crust. Additional related activities during Expedition 336 included recovery of an instrument string that was deployed within an earlier generation of a circulation obviation retrofit kit (CORK) observatory in Hole 395A and preparation of IODP Hole U1383B, which was drilled, cased, and left open during Expedition 336, for a future deployment of a borehole observatory. A streamlined CORK observatory was deployed in Hole U1383B during a remotely operated vehicle–supported cruise in April 2012. An additional CORK servicing cruise is scheduled for 2013. Here, we summarize the observatory project goals and provide an overview of the design, construction, and deployment of these CORKs and related instrumentation during Expedition 336. We also summarize the project goals, design, and construction for the CORK-lite installation in Hole U1383B and discuss plans for its deployment. CORK servicing plans for 2012 and 2013 also are presented. ¹Edwards, K.J., Wheat, C.G., Orcutt, B.N., Hulme, S., Becker, K., Jannasch, H., Haddad, A., Pettigrew, T., Rhinehart, W., Grigar, K., Bach, W., Kirkwood, W., and Klaus, A., 2012. Design and deployment of borehole observatories and experiments during IODP Expedition 336, Mid-Atlantic Ridge flank at North Pond. In Edwards, K.J., Bach, W., Klaus, A., and the Expedition 336 Scientists, Proc. IODP, 336: Tokyo (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.336.109.2012 ²Expedition 336 Scientists’ addresses. ³Correspondence author: kje@usc.edu ⁴Monterey Bay Aquarium Research Institute, Moss Landing CA 95039, USA. ⁵Pettigrew Engineering, Milam TX 75959, USA. ⁶Integrated Ocean Drilling Program, Texas A&M University, College Station TX 77845, USA. Publication: 16 November 2012 MS 336-109 Top of page \| Previous \| Next