Proc. IODP, 335, Deep drilling of intact ocean crust: harnessing past lessons to inform future endeavors

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Chapter contents Introduction The case for deep drilling of intact ocean crust Why study crust forming at fast spreading rates? The need for basic geologic observations of ocean crustal architecture Deep scientific ocean drilling is the only approach that can provide basic geologic observations on the formation and evolution of fast-spreading ocean crust Summary of scientific ocean drilling of the ocean basement, “Project Mohole” to IODP Expedition 335 Criteria for the siting of deep drill holes and considerations for achieving deep drilling objectives Drilling deep holes in crustal hard rocks: tales of patience and perseverance Drilling young unsedimented lavas Considerations for the location of scientific wells with deep objectives Program considerations for the attainment of deep targets by scientific ocean drilling References Figures F1. Distribution of spreading rates. F2. Spreading rates of ocean crust. F3. Seismic P-wave velocity. F4. Crustal accretion models. F5. Map of ocean floor age. F6. Holes drilled from 1974 to 2010. F7. Age map. F8. Time vs. depth, Hole 504B. F9. Time vs. depth, Hole 1256D. F10. Progressive deepening, Holes 504B and 1256D. Tables T1. Drill holes into oceanic basement. T2. Conditions for siting deep drill holes. T3. Operations summary, Hole 504B. T4. Operations summary, Hole 1256D. PDF file			Previous \| Next doi:10.2204/iodp.proc.335.104.2012 Deep drilling of intact ocean crust: harnessing past lessons to inform future endeavors¹ Expedition 335 Scientists² Introduction This chapter provides a review of the scientific imperatives for deep drilling of oceanic crust, a review of past successes and challenges with deep drilling, thoughts on the siting of deep boreholes, and final comments on scientific ocean drilling programmatic changes that would enhance the success of deep drilling experiments in ocean lithosphere. ¹ Expedition 335 Scientists, 2012. Deep drilling of intact ocean crust: harnessing past lessons to inform future endeavors. In Teagle, D.A.H., Ildefonse, B., Blum, P., and the Expedition 335 Scientists, Proc. IODP, 335: Tokyo (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.335.104.2012 ² Expedition 335 Scientists’ addresses. Publication: 3 June 2012 MS 335-104 Top of page \| Previous \| Next