Expedition 327 summary

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doi: 10.2204/iodp.proc.327.101.2011
Author(s): Fisher, Andrew; Tsuji, Takeshi; Petronotis, Katerina; Mrozewski, Stefan; Becker, Keir; Cowen, James P.; Harris, Michelle; Hulme, Samuel M.; Inderbitzen, Katherine; Ji Fuwu; Masui, Reona; Miyamoto, Hiroki; Morvan, Sylvain; Orcutt, Beth; Rutter, Jennifer; Turner, Amanda G.; Wheat, C. Geoffrey; Winslow, Dustin M.
Integrated Ocean Drilling Program, Expedition 327 Scientists, College Station, TX
Author Affiliation(s): Primary:
University of California, Santa Cruz, Earth and Planetary Sciences Department, Santa Cruz, CA, United States
Other:
Kyoto University, Japan
Texas A&M University, United States
Lamont-Doherty Earth Observatory, United States
University of Miami, United States
University of Hawaii-Manoa, United States
University of Southampton, United Kingdom
Tongji University, China
École Normale Supérieure, France
Arhus Universitet, Denmark
University of Southern California, United States
University of Alaska-Fairbanks, United States
University of Hawaii at Manoa, United States
University of Southhampton, United Kingdom
Volume Title: Proceedings of the Integrated Ocean Drilling Program; Juan de Fuca Ridge flank hydrogeology; Expedition 327 of the riserless drilling platform from and to Victoria, British Columbia (Canada); Sites U1362, U1301, 1027, and U1363; 5 July-5 September 2010
Volume Author(s): Fisher, Andrew; Tsuji, Takeshi; Petronotis, Katerina; Mrozewski, Stefan; Becker, Keir; Cowen, James P.; Harris, Michelle; Hulme, Samuel M.; Inderbitzen, Katherine; Ji Fuwu; Masui, Reona; Miyamoto, Hiroki; Morvan, Sylvain; Orcutt, Beth; Rutter, Jennifer; Turner, Amanda G.; Wheat, C. Geoffrey; Winslow, Dustin M.
Source: Proceedings of the Integrated Ocean Drilling Program; Juan de Fuca Ridge flank hydrogeology; Expedition 327 of the riserless drilling platform from and to Victoria, British Columbia (Canada); Sites U1362, U1301, 1027, and U1363; 5 July-5 September 2010, Andrew Fisher, Takeshi Tsuji, Katerina Petronotis, Stefan Mrozewski, Keir Becker, James P. Cowen, Michelle Harris, Samuel M. Hulme, Katherine Inderbitzen, Ji Fuwu, Reona Masui, Hiroki Miyamoto, Sylvain Morvan, Beth Orcutt, Jennifer Rutter, Amanda G. Turner, C. Geoffrey Wheat and Dustin M. Winslow; Integrated Ocean Drilling Program, Expedition 327 Scientists, College Station, TX. Proceedings of the Integrated Ocean Drilling Program, Vol.327, 32p. Publisher: IODP Management International, Washington, DC, United States. ISSN: 1930-1014
Note: In English. 35 refs.; illus., incl. 3 tables, sketch map
Summary: Integrated Ocean Drilling Program (IODP) Expedition 327 and related experiments focus on understanding fluid-rock interactions in young upper ocean crust on the eastern flank of the Juan de Fuca Ridge, delineating the magnitude and distribution of hydrologic properties; the extent to which crustal compartments are connected or isolated (laterally and with depth); the rates and spatial extent of ridge-flank fluid circulation; and links between ridge-flank circulation, crustal alteration, and geomicrobial processes. Expedition 327 built on the achievements of Ocean Drilling Program (ODP) Leg 168, IODP Expedition 301, and subsequent submersible and remotely operated vehicle (ROV) expeditions. During earlier drilling expeditions, subseafloor borehole observatories ("CORKs") were installed in basement holes to allow borehole conditions to recover to a more natural state after the dissipation of disturbances caused by drilling, casing, and other operations; to provide a long-term monitoring and sampling presence for determining fluid pressure, temperature, composition, and microbiology; and to facilitate the completion of active experiments to resolve crustal hydrogeologic conditions and processes. During Expedition 327, two basement holes were cored and drilled at Site U1362. Hole U1362A was cored and drilled to 528 meters below seafloor (mbsf) (292 meters subbasement [msb]), geophysically logged and hydrologically tested, and instrumented with a multilevel CORK observatory. Hole U1362B was drilled to 359 mbsf (117 msb), tested with a 24 h pumping and tracer injection experiment, and instrumented with a single-level CORK observatory. Both CORK observatories include pressure and temperature monitoring and downhole fluid and microbiology sampling and experiments. Wellhead samplers will be added and a longterm cross-hole test will be initiated during a postdrilling ROV expedition scheduled for summer 2011. In addition, part of an instrument string deployed in Hole U1301B during Expedition 301 was recovered during Expedition 327, and a replacement string of thermal sensors was installed. Finally, a program of shallow sediment coring was completed adjacent to Grizzly Bare outcrop, a location where regional hydrothermal recharge occurs. Thermal measurements and analyses of pore fluid and microbiological samples from a series of holes aligned radially from the outcrop edge will elucidate rates of fluid transport and evolution during the initial stages of ridge-flank hydrothermal circulation.
Year of Publication: 2011
Research Program: IODP Integrated Ocean Drilling Program
ODP Ocean Drilling Program
Key Words: 21 Hydrogeology and Hydrology; Basement; Boreholes; CORK; Circulation; Circulation Obviation Retrofit Kit; Cores; Crust; Drilling; East Pacific; Endeavour Ridge; Expedition 301; Expedition 327; Experimental studies; Fluid phase; Geophysical methods; Geophysical profiles; Geophysical surveys; Ground water; Hydrothermal conditions; IODP Site U1301; IODP Site U1362; IODP Site U1363; Igneous rocks; Integrated Ocean Drilling Program; Juan de Fuca Ridge; Leg 168; Lithosphere; Marine drilling; Marine sediments; Monitoring; North Pacific; Northeast Pacific; ODP Site 1027; Observatories; Ocean Drilling Program; Oceanic crust; Pacific Ocean; Permeability; Pore water; Pressure; Recharge; Sediments; Seismic methods; Seismic profiles; Seismic stratigraphy; Surveys; Temperature; Tracers; Upper crust; Volcanic rocks; Water-rock interaction
Coordinates: N471000 N475000 W1274000 W1281000
Record ID: 2011080409
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute.