Fisher, Andrew; Cowen, James P.; Wheat, C. Geoffrey; Clark, J. F. (2011): Preparation and injection of fluid tracers during IODP Expedition 327, eastern flank of Juan de Fuca Ridge. IODP Management International, Washington, DC, United States, In: 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., 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, 327, georefid:2011-080415

Multiple tracers were pumped into upper basement around Hole U1362B during Integrated Ocean Drilling Program (IODP) Expedition 327 as part of a single- and cross-hole tracer experiment on the eastern flank of Juan de Fuca Ridge. Tracers injected were sulfur hexafluoride (dissolved gas), cesium chloride hexahydrate, erbium chloride, and holmium chloride hexahydrate (solutes), and several sizes of fluorescent microspheres and fluorescent-stained microbes filtered from surface seawater (particles). Tracers were injected as part of a 24 h pumping experiment intended to test a large volume of basement rock around Hole U1362B. We report on the design of the tracer experiment, methods used to prepare and inject tracers using shipboard mud and cement pump systems, and tools developed to permit shipboard and downhole sampling of injectate. Shore-based analysis of injectate samples will be essential for interpretation of long-term samples collected from subseafloor borehole observatories ("CORKs"). Borehole samples are being collected continuously within a long-term CORK installed in Hole U1362B after tracer injection was complete and within similar CORK systems installed in nearby boreholes before and during Expedition 327. CORK servicing expeditions are currently planned for summer 2011 and 2012. These expeditions and additional work in subsequent years will provide data and samples that will permit a quantitative assessment of tracer transport behavior in the upper ocean crust.
West: -127.4700 East: -127.4526 North: 47.4600 South: 47.4500
Expedition: 301
Site: 301-U1301
Expedition: 327
Site: 327-U1301
Site: 327-U1362
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