HR: 0800h
AN: V51B-1486    [Abstracts]
TI: Where does fluid go in the seawater from the Lost City Hydrothermal Field?
AU: * Nakamura, K
EM: koichi.nakamura@aist.go.jp
AF: National Institute of Advanced Industrial Science and Technology (AIST), Institute of Geology and Geoinformation (IGG), AIST Tsukuba Central 7, 1-1-1 Higashi, Tsukuba, 3058567 Japan
AU: Kelley, D S
EM: kelley@ocean.washington.edu
AF: University of Washington, School of Oceanography, Box 357940, Seattle, WA 98195 United States
AU: Glickson, D
EM: glickson@u.washington.edu
AF: University of Washington, School of Oceanography, Box 357940, Seattle, WA 98195 United States
AU: Lilley, M D
EM: lilley@u.washington.edu
AF: University of Washington, School of Oceanography, Box 357940, Seattle, WA 98195 United States
AU: Proskurowski, G
EM: giora@whoi.edu
AF: Woods Hole Oceanographic Institution, 266 Woods Hole Rd, Woods Hole, MA 02543 United States
AU: Olson, E J
EM: olson@ocean.washington.edu
AF: University of Washington, School of Oceanography, Box 357940, Seattle, WA 98195 United States
AU: Yoerger, D R
EM: dyoerger@whoi.edu
AF: Woods Hole Oceanographic Institution, 266 Woods Hole Rd, Woods Hole, MA 02543 United States
AU: Bradley, A M
EM: abradley@whoi.edu
AF: Woods Hole Oceanographic Institution, 266 Woods Hole Rd, Woods Hole, MA 02543 United States
AU: Jakuba, M
EM: jakuba@mit.edu
AF: MIT/WHOI Joint Program, Deep Submergence Lab, MS 7, Woods Hole, MA 02543 United States
AB: Unlike common hot vent fluids the fluid from the serpentinite hosted vents does not have enough buoyancy to create hydrothermal plume. This would raise two questions. 1. How are microbes as well as larvae of hydrothermal benthos dispersed with fluid? 2. In the exploration point of view, how do we search the fluid source if we detect fluid tail? During the last two expeditions in the Lost City hydrothermal field (LCHF, 2003 R/V Atlantis, AT07-34 cruise and 2005 R/V Ronald H. Brown, the redox (Eh) sensor clearly indicated presence of fluid in seawater through CTD, ABE (AUV), Alvin (DSV) and Hercules (ROV) missions. The redox potential was measured by a Pt electrode and a reference electrode, which has Ag-AgCl electrode in saturated KCl solution. The electrode voltage were logged through either converted analog voltage output (CTD and ABE) or RS-232 base digital data transmission (Alvin and Hercules). This presentation shows the spatial distribution of fluid dispersion around LCHF and would give us clue to solve questions.
DE: 0448 Geomicrobiology
DE: 0450 Hydrothermal systems (1034, 3017, 3616, 4832, 8135, 8424)
DE: 0471 Oxidation/reduction reactions (4851)
DE: 4832 Hydrothermal systems (0450, 1034, 3017, 3616, 8135, 8424)
DE: 4851 Oxidation/reduction reactions (0471)
SC: Volcanology, Geochemistry, Petrology [V]
MN: Fall Meeting 2005