[摘要] Integrated Ocean Drilling Program (IODP) Expedition327 (summer 2010) was designed to resolve the nature offluid-rock interactions in young, upper volcanic crust on theeastern flank of the Juan de Fuca Ridge. Expedition 327drilled, cased and cored two new basement holes, conductedhydrogeologic experiments, and installed subseafloorborehole observatories (
Circulation Obviation Retrofit Kits,CORKs). These CORKs were intended to allow boreholeconditions to recover to a more natural state after the dissipationof disturbances caused by drilling, casing, and otheroperations; provide a long-term monitoring and samplingpresence for determining fluid pressure, temperature, composition,and microbiology; and facilitate the completion ofactive experiments to resolve crustal hydrogeologic conditionsand processes. Expedition 327 was followed (summer2011) by R/V
Atlantis Expedition AT18-07, with theremotely-operated vehicle (ROV)
Jason, to service theseCORKs, collect subseafloor pressure data, recover anddeploy autonomous fluid and microbial samplers, collectlarge volumes of borehole fluids, and initiate a cross-holehydrogeologic experiment using an electromagnetic flowmeter. In addition,
Atlantis Expedition AT18-07 refurbishedan old CORK that could not be replaced duringIODP Expedition 327, completing a critical part of thethree-dimensional observation network that is currentlybeing used to monitor a large-scale, directional formationresponse to long-term fluid flow from the crust.
doi:
10.2204/iodp.sd.13.01.2011
